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An estimation of nutrient fluxes to the East China Sea continental shelf from the Taiwan Strait and Kuroshio subsurface waters in summer 被引量:10
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作者 LI Hongmei SHI Xiaoyong +1 位作者 WANG Hao HAN Xiurong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第11期1-10,共10页
According to historical mean ocean current data through the field observations of the Taiwan Ocean Research Institute during 1991–2005 and survey data of nutrients on the continental shelf of the East China Sea(ECS... According to historical mean ocean current data through the field observations of the Taiwan Ocean Research Institute during 1991–2005 and survey data of nutrients on the continental shelf of the East China Sea(ECS) in the summer of 2006, nutrient fluxes from the Taiwan Strait and Kuroshio subsurface waters are estimated using a grid interpolation method, which both are the sources of the Taiwan Warm Current. The nutrient fluxes of the two water masses are also compared. The results show that phosphate(PO4-P), silicate(SiO3-Si) and nitrate(NO3-N) fluxes to the ECS continental shelf from the Kuroshio upwelling water are slightly higher than those from the Taiwan Strait water in the summer of 2006. In contrast, owing to its lower velocity, the nutrient flux density(i.e., nutrient fluxes divided by the area of the specific section) of the Kuroshio subsurface water is lower than that of the Taiwan Strait water. In addition, the Taiwan Warm Current deep water, which is mainly constituted by the Kuroshio subsurface water, might directly reach the areas of high-frequency harmful alga blooms in the ECS. 展开更多
关键词 NUTRIENT FLUX taiwan Warm Current SUMMER East china Sea
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Circulations east of Taiwan and in East China Sea and east of Ryukyu Islands during early summer 1985 被引量:8
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作者 Yuan Yaochu Cho-teng Liu +1 位作者 Pan Ziqin and Shi-pei Zhend 《Acta Oceanologica Sinica》 SCIE CAS CSCD 1996年第4期423-435,共13页
A modified inverse method is used to compute the circulations east of Taiwan and in the East China Sec and east of the Ryukyu Islands with hydrographic data obtained during early summer of 1985. The computational regi... A modified inverse method is used to compute the circulations east of Taiwan and in the East China Sec and east of the Ryukyu Islands with hydrographic data obtained during early summer of 1985. The computational region covers an area west of 129°E and from 21°45'N to 35°N. The computed results show that: (1 ) The net volume transport (VT ) of the Kuroshio through 21°45'N Section east of Ta Taiwan and west of 123°E is about 45 × 10 ̄6 m ̄3/sduring early summer of 1985. The Kuroshio has. two current cores. One is located near Taiwan, and its velocity isvery large and its maximum velocity is 226 cm/s at the 100 m level, which is close to the maximum velocity of the beginning of the Kuroshio east of the Philippines. The other is located further to the east, and its maximum velocity is159 cm/s at the 100m level; (2) through a transect northwest Of Miyakojima Island and a transect southwest of Okinawa laaed the volume transports of the Kuroshio in the East China Sea both are about 25 × 10 ̄6 m ̄3/s. The maximumvelocity of the Kuroshio at these two sections is 194 and 128 cm/s, respectively, and both are located on the shelfbreak; (3) beneath and east of the Kurohio there are the countercurrent (4) southeast of Okinawa Island there is anortheastward current, and its VT at Section HI is about 12. 6 × 10 ̄6 m ̄3/s, and it comes from a westward flow at 129° This project was supported by the National Natural Science Foundation of China under contract No. 49476278.(Second Institute of Oceanography, State Oceanic Administration, Hongzhou310012, China) (Institute of Oceanography, Taiwan University, Taipei, China)E Section and the recirculating gyre, and does not originate from the Kuroshio east of Taiwan during early summer of 1985. There is a southwestward abyssal current east of Okinawa Islands (5) there are several different scale eddies in this computational region. For example, there is a meso-scale strong cyclonic eddy east of Miyakojima Island. 展开更多
关键词 CIRCULATION area east of taiwan East china Sea area east of the Ryukyu Islands
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Nutrient Structure of the Taiwan Warm Current and Estimation of Vertical Nutrient Fluxes in Upwelling Areas in the East China Sea in Summer 被引量:5
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作者 SHI Xiaoyong LI Hongmei WANG Hao 《Journal of Ocean University of China》 SCIE CAS 2014年第4期613-620,共8页
Based on field data for nutrients collected on the continental shelf of the East China Sea(ECS) during summer 2006, the structure and variations of nutrients in every water mass related to the Taiwan Warm Current(TWC)... Based on field data for nutrients collected on the continental shelf of the East China Sea(ECS) during summer 2006, the structure and variations of nutrients in every water mass related to the Taiwan Warm Current(TWC) were analyzed. The supplementary effect of nutrient of upwelling on harmful algal blooms(HABs) in the ECS was also estimated, based on upwelling data. Then the maintenance contribution of nutrient of upwelling to HABs was assessed. The results showed that N/P ratio is fairly low in both surface and deep layers of the TWC, which possibly controls nutrient structure of the HABs-frequently-occuring areas. In upwelling areas, the rate of phosphate(PO4-P) uptake exceeds that of nitrate(NO3-N) of the TWC. The TWC may relieve PO4-P limitation during the process of HABs. Furthermore, upwelling plays an important role in providing nutrients to HABs. After estimating nutrient fluxes(NO3-N, PO4-P, Si O3-Si) in the upwelling areas along a typical section(S07), the results showed that the nutrient uptake rate is the greatest at 10-20 m below euphotic zone, sustaining the ongoing presence of HABs. The uptake rate of PO4-P is the highest among dissolved inorganic nutrients. Therefore, upwelling is most likely the main source of PO4-P supply to HABs. 展开更多
关键词 nutrient structure FLUX taiwan Warm Current UPWELLinG East china Sea
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Sectional distribution of salinity and its indication of Kuroshio'sintrusion in the southern Taiwan Strait and northeastern South China Sea late summer, 1994 被引量:2
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作者 Hu Jianyu Liang Hongxing and Zhang Xuebin 1. Institute of Subtropical Oceanography, Xiamen University, Xiamen 361005, China 2. Fujian Institute of Oceanology, Xiamen 361012, China (Received June 3, 1998 accepted August 8, 1998) 《Acta Oceanologica Sinica》 SCIE CAS CSCD 1999年第2期225-236,共12页
Using the CTD data investigated at about 330 stations in the southern Taiwan Strait, the northeastern South China Sea and their adjacent seas in August and September of 1994, this paper anayses the sectional distribut... Using the CTD data investigated at about 330 stations in the southern Taiwan Strait, the northeastern South China Sea and their adjacent seas in August and September of 1994, this paper anayses the sectional distributions of salinity in 10 selected sections and discusses the possibility of the Kuroshio's intrusion into the northeastern South China Sea and the southern Taiwan Strait. The results show that: as the main stream of Kuroshio passes by the northern Luzon Strait during the survey period, the 'Kuroshio-influenced water' with some hydrological features of the Kuroshio may extend through the Luzon Strait to the sea areas near both the Dongsha Islands and the Taiwan Shoal of the southern Taiwan Strait. 展开更多
关键词 Sectional distribution of salinity Kuroshio's intrusion late summer southern taiwan Strait northeastern South china Sea
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Strong Earthquake Model of North China Craton: A Case of 2023 Mw 5.5 Earthquake in Pingyuan County, Shandong Province, China
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作者 LIU Guanshen LU Renqi +2 位作者 HE Dengfa FANG Lihua ZHANG Yang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第S01期39-40,共2页
North China is one of the high-risk areas for destructive strong earthquakes in China's Mainland, with a history of numerous significant seismic events. On August 6, 2023, an Mw5.5 earthquake struck Pingyuan Count... North China is one of the high-risk areas for destructive strong earthquakes in China's Mainland, with a history of numerous significant seismic events. On August 6, 2023, an Mw5.5 earthquake struck Pingyuan County, Dezhou City, in Shandong Province, China. This earthquake was the largest in the eastern North China Craton(NCC) since the Tangshan earthquake of 1976. Due to the absence of surface ruptures, the fault responsible for the Pingyuan Mw5.5 earthquake remains unclear. To reveal the subsurface geological structure near the earthquake epicenter, this study utilized highresolution two-dimensional seismic reflection profiles to interpret pre-existing faults. 展开更多
关键词 Pingyuan earthquake seismogenic fault relocation earthquakes North china Craton
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An open access dataset for strong-motion data(PGA,PGV,and Site V_(S30))of 2023 M6.2 Jishishan,Gansu,China earthquake
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作者 Jian Zhou Li Li +4 位作者 Nan Xi Kun Chen Xin Tian Chao Wang Jifeng Tian 《Earthquake Science》 2024年第6期584-587,共4页
1.Introduction On December 18,2023,a M6.2 earthquake struck central China with epicenter at Jishishan,Gansu(35.70°N,102.79°E).In the USGS Latest Earthquake platform,the event was identified as M_(W)5.9,35.74... 1.Introduction On December 18,2023,a M6.2 earthquake struck central China with epicenter at Jishishan,Gansu(35.70°N,102.79°E).In the USGS Latest Earthquake platform,the event was identified as M_(W)5.9,35.743°N,102.827°E,labeled 37 km WNW of Linxia Chengguanzhen,China.This study presents an open-access dataset comprising PGA and PGV records of the main-shock from 202accelerometers and 539 Micro-Electro-Mechanical System(MEMS)sensors within two arcdegrees of the epicenter. 展开更多
关键词 china. earthquake epicenter
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A comparative study of the main factors controlling geohazards induced by 10 strong earthquakes in Western China since the Wenchuan earthquake in 2008 被引量:5
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作者 Chao Peng Zhi-qiang Yin +2 位作者 Xu-jiao Zhang Hai Shao Ming-fei Pang 《China Geology》 CAS CSCD 2023年第1期70-84,共15页
Determining the main controlling factors of earthquake-triggered geohazards is a prerequisite for studying earthquake geohazards and post-disaster emergency response.By studying these factors,the geomorphic and geolog... Determining the main controlling factors of earthquake-triggered geohazards is a prerequisite for studying earthquake geohazards and post-disaster emergency response.By studying these factors,the geomorphic and geological factors controlling the nature,condition,and distribution of earthquake-induced geohazards can be analyzed.Such insights facilitate earthquake disaster prediction and emergency response planning.The authors combined field investigations and spatial data analysis to examine geohazards induced by seismic events,examining ten earthquakes including the Wenchuan,Yushu,Lushan events,to elucidate the main control factors of seismic geohazard.The authors observed that seismic geohazard occurrence is usually affected by many factors,among which active nature of the seismogenic fault,seismic peak ground acceleration(PGA),topographic slope and geomorphic height differences,and distance from the fault zone and river system are the most important.Compared with strike-slip earthquakes,thrust earthquakes induce more high-altitude and high-speed remote landslides,which can cause great harm.Slopes of 0°–40°are prone to secondary seismic geohazards,which are mainly concentrated 0–6 km from the river system.Secondary geohazards are not only related to seismogenic fault but also influenced by the associated faults in the earthquake area.The maximum seismic PGA and secondary seismic geohazard number are positively correlated,and the horizontal and vertical ground motions play leading and promoting roles in secondary geohazard formation,respectively.Through the research,the spatial distribution of seismic geohazards is predicted,providing a basis for the formulation of emergency response plans following disasters. 展开更多
关键词 Wenchuan earthquake GEOHAZARDS Main control factors Comparative study Geological disater survey engineering Western china
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Seismogenic model of the 2023 M_(W)5.5 Pingyuan earthquake in North China Plain and its tectonic implications
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作者 Shiguang Wang Libo Han +5 位作者 Junju Xie Liping Fan Xiang Huang Jinmeng Bi Hongfeng Yang Lihua Fang 《Earthquake Science》 2024年第6期499-513,共15页
The 6 August 2023 M_(W)5.5 Pingyuan earthquake is the largest earthquake in the central North China Plain(NCP)over the past two decades.Due to the thick sedimentary cover,no corresponding active faults have been repor... The 6 August 2023 M_(W)5.5 Pingyuan earthquake is the largest earthquake in the central North China Plain(NCP)over the past two decades.Due to the thick sedimentary cover,no corresponding active faults have been reported yet in the epicenter area.Thus,this earthquake presents a unique opportunity to delve into the buried active faults beneath the NCP.By integrating strong ground motion records,high-precision aftershock sequence relocation,and focal mechanism solutions,we gain insights into the seismotectonics of the Pingyuan earthquake.The aftershocks are clustered at depths ranging from 15 to 20 km and delineate a NE-SW trend,consistent with the distribution of ground motion records.A NE-SW nodal plane(226°)of the focal mechanism solutions is also derived from regional waveform inversion,suggesting that the mainshock was dominated by strike-slip motion with minor normal faulting component.Integrating regional geological data,we propose that an unrecognized fault between the NE-SW trending Gaotang and Lingxian-Yangxin faults is the seismogenic fault of this event.Based on the S-wave velocity structure beneath the NCP,this fault probably extends into the lower crust with a high angle.Considering the tectonic regime and stress state,we speculate that the interplay of shear strain between the Amurian and South China blocks and the hot upwelling magma from the subducted paleo Pacific flat slab significantly contributed to the generation of the Pingyuan earthquake. 展开更多
关键词 Pingyuan earthquake aftershock relocation focal mechanism S-wave velocity structure North china Plain
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Key technologies of earthquake early warning system for China’s high-speed railway
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作者 Geming Zhang Lin Yang Wenxiang Jiang 《Railway Sciences》 2024年第2期239-262,共24页
Purpose–The purpose of this study is to introduce the top-level design ideas and the overall architecture of earthquake early-warning system for high speed railways in China,which is based on P-wave earthquake early-... Purpose–The purpose of this study is to introduce the top-level design ideas and the overall architecture of earthquake early-warning system for high speed railways in China,which is based on P-wave earthquake early-warning and multiple ways of rapid treatment.Design/methodology/approach–The paper describes the key technologies that are involved in the development of the system,such as P-wave identification and earthquake early-warning,multi-source seismic information fusion and earthquake emergency treatment technologies.The paper also presents the test results of the system,which show that it has complete functions and its major performance indicators meet the design requirements.Findings–The study demonstrates that the high speed railways earthquake early-warning system serves as an important technical tool for high speed railways to cope with the threat of earthquake to the operation safety.The key technical indicators of the system have excellent performance:The first report time of the P-wave is less than three seconds.From the first arrival of P-wave to the beginning of train braking,the total delay of onboard emergency treatment is 3.63 seconds under 95%probability.The average total delay for power failures triggered by substations is 3.3 seconds.Originality/value–The paper provides a valuable reference for the research and development of earthquake early-warning system for high speed railways in other countries and regions.It also contributes to the earthquake prevention and disaster reduction efforts. 展开更多
关键词 Earthquake early-warning High speed railway china earthquake networks center(CENC) Earthquake emergency treatment
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Characteristics and main controlling factors of helium resources in the main petroliferous basins of the North China Craton
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作者 Zihan Gao Zhi Chen +5 位作者 Hongyi He Zhaofei Liu Chang Lu Hanyu Wang Yili Luo Ying Li 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2024年第2期23-33,共11页
At present, the main controlling factors of helium accumulation is one of the key scientific problems restricting the exploration and development of helium reservoir. In this paper, based on the calculation results of... At present, the main controlling factors of helium accumulation is one of the key scientific problems restricting the exploration and development of helium reservoir. In this paper, based on the calculation results of He generation rate and the geochemical characteristics of the produced gas, both the similarities and differences between natural gas and He resources in the Bohai Bay, Ordos and the surrounding Songliao Basin are compared and analyzed, discussing the main controlling factors of helium resources in the three main petroliferous basins of the North China Craton. It is found that the three basins of Bohai Bay, Ordos and Songliao have similar characteristics of source rocks, reservoirs and cap rocks, that's why their methane resource characteristics are essentially the same. The calculated ~4He generation per cubic metamorphic crystalline basement in the three basins is roughly equivalent, which is consistent with the measured He resources, and it is believed that the ~4He of radiogenic from the crust is the main factor controlling the overall He accumulation in the three basins;there is almost no contribution of the mantle-derived CH_4, which suggests that the transport and uplift of mantle-derived ~3He carried by the present-day magmatic activities along the deep-large faults is not the main reason for the mantle-derived ~3He mixing in the basins. Combined with the results of regional volcanic and geophysical studies,it is concluded that under the background of the destruction of North China Craton, magma intrusion carried a large amount of mantle-derived material and formed basic volcanic rocks in the Bohai Bay Basin and Songliao Basin, which replenished mantle-derived ~3He for the interior of the basins, and that strong seismic activities in and around the basins also promoted the upward migration of mantle source ~3He. This study suggests that the tectonic zone with dense volcanic rocks in the Cenozoic era and a high incidence of historical strong earthquakes history may be a potential area for helium resource exploration. 展开更多
关键词 HELIUM Bohai Bay Basin destruction of the North china Craton FAULT Cenozoic volcanic rocks strong earthquake activity
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Statistical analysis on temporal-spatial correlativity within temporal doublets of strong earthquakes in North China and its vicinity 被引量:1
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作者 裴韬 周成虎 +1 位作者 李全林 陈锦标 《Acta Seismologica Sinica(English Edition)》 CSCD 2002年第1期56-62,共7页
In order to unify the time and the space attributes into temporal-spatial distance, the temporal-spatial proportional coefficient fTS is proposed in this paper. In accordance with the new distance concept, the tempora... In order to unify the time and the space attributes into temporal-spatial distance, the temporal-spatial proportional coefficient fTS is proposed in this paper. In accordance with the new distance concept, the temporal-spatial correlativity within temporal doublets of strong earthquakes in North China and its vicinity since AD 1500 has been analyzed. The computation results indicate that doublets of strong earthquake can be divided into two groups when fTS is endowed with 10 km/a in the new distance formula. The temporal-spatial distance between two points of doublet generally cannot exceed 140 km when two strong quakes in doublet have some causative relation. And those doublets with temporal-spatial distance exceeding 280 km are probably independent seismic events in doublets. This character can be the reference to the migration law summarization and trend prediction. 展开更多
关键词 North china and its vicinity temporal doublets of strong earthquake temporal-spatial distance
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The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea 被引量:1
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作者 GUO Lei ZHAN Wenhuan +6 位作者 ZHANG Fan ZHANG Jinchang YAO Yantao LI Jian FENG Yingci CHEN Mei CHENG Gong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第3期99-108,共10页
It is exceedingly important to estimate the stability of coral reefs. In recent years, growing construction projects have been carried out on the reef flat in the South China Sea. As a special marine geotechnical medi... It is exceedingly important to estimate the stability of coral reefs. In recent years, growing construction projects have been carried out on the reef flat in the South China Sea. As a special marine geotechnical medium, it is made of the reef debris underwent overwhelmingly long geological age. Reefs grow thickly on the carbonate platform after the Late Oligocene and have five to six main sedimentary facies. It can be used as a recorder to measure the occurrence time of recent earthquake. A model of reef body is presented to study the influence of earthquakes according to the geological structure characteristic of reefs in the Nansha Islands. Furthermore, Geo Studio is used to simulate stress and deformation situations within it under various earthquake intensities. A safety factor is calculated by the limit equilibrium method, and the possible scenarios of earthquake-induced landslides and sliding scale are defined with a Newmark sliding block method, as well as stress distribution and deformation behaviors. Therefore, the numerical results suggest that the connections between the coral reef and the earthquake are as follows:(1) the reef body has a good stability under self-gravity state;(2) after the earthquake, it may cause slope's instability and bring out slumping when the safety factor is smaller than 1(FS〈1);(3) the safety factor decreases with the increasing earthquake intensity, and fluctuates around a particular value after a while;and(4) as a new developed part of the reef, the smaller shallow landslide will be easily subject to collapse caused by the earthquake. It is concluded that it is feasible to provide a reference for evaluating the stability of coral reef using a geotechnical engineering simulation method. This can help the engineering constructions in the South China Sea. 展开更多
关键词 Zhubi Reef earthquake limit equilibrium method safety factor Nansha Islands South china Sea
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The Statistical Analysis of Migration of Strong Earthquakes─Taking the North China Region as an Example 被引量:1
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作者 QinChengzhi ZhouChenghu +1 位作者 PeiTao LiQuanlin 《Earthquake Research in China》 2004年第2期178-187,共10页
The migration of strong earthquakes is an important research topic because the migration phenomena reflect partly the seismic mechanism and involve the prediction of tendency of seismic activity. Research on migration... The migration of strong earthquakes is an important research topic because the migration phenomena reflect partly the seismic mechanism and involve the prediction of tendency of seismic activity. Research on migration of strong earthquakes has mostly focused on finding the phenomena. Some attempts on getting regularity were comparatively subjective. This paper suggests that there should be indices of migration in earthquake dataset and the indexes should have statistical meaning if there is regularity in the migration of strong earthquakes. In this study, three derivative attributes of migration, i.e., migration orientation, migration distance and migration time interval, were statistically analyzed. Results in the North China region show that the migration of strong earthquakes has statistical meaning. There is a dominant migration orientation (W by S to E by N), a dominant distance (≤100km and on the confines of 300~700km), and a dominant time interval (≤1a and on the confines of 3~4a). The results also show that the migration will differ slightly with different magnitude range or earthquake activity phase. 展开更多
关键词 Migration of strong earthquakes Statistical analysis The North china region
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AIC analysis of categorizing data for earthquakes and velocity structures in North China
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作者 孙若昧 石耀霖 刘杰 《Acta Seismologica Sinica(English Edition)》 CSCD 1999年第1期11-18,共8页
The relation between the occurrence of strong earthquakes and the tomographic velocity structure in North China is quantitatively analyzed by using the AIC analysis method for categorical data. The results indicate th... The relation between the occurrence of strong earthquakes and the tomographic velocity structure in North China is quantitatively analyzed by using the AIC analysis method for categorical data. The results indicate that the areas of low P wave velocity in the lower crust and the top of upper mantle and areas of high S wave horizontal gradient in the upper and lower crust are correlated with earthquakes of magnitude greater than 5~6. The correlation may be related to the geodynamics of Cenozoic thinning of the lithosphere and upwelling of mantle materials. The lateral inhomogeneous zones in crustal structure and thermal state are prone to occur strong earthquakes. 展开更多
关键词 AIC method TOMOGRAPHY earthquake distribution North china
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Deep structural characteristics and seismogenesis of the M≥8.0 earthquakes in North China
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作者 张先 张先康 +1 位作者 刘敏 赵丽 《Acta Seismologica Sinica(English Edition)》 CSCD 2003年第2期148-155,共8页
Based on the results from seismogeological study, aeromagnetic inversion and deep seismic sounding (DSS), it is found that the M8.0 earthquakes in North China have three common deep structural characteristics, i.e., t... Based on the results from seismogeological study, aeromagnetic inversion and deep seismic sounding (DSS), it is found that the M8.0 earthquakes in North China have three common deep structural characteristics, i.e., they all took place above the ultra-crustal deep faults or on the edges of the tectonic blocks with higher intensity, and there are low-velocity, low-density and high-conductive layers deep in the epicentral regions. The origins of the earth-quakes are also discussed and the two possibilities of seismogenesis are proposed, i.e., tectonic movement and intracrustal explosion. 展开更多
关键词 North china M8.0 earthquakes deep structure SEISMOGENESIS
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Recurrence anomaly of ground water behavior before strong earthquakes in North China
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作者 CAO Xin-lai(曹新来) BIAN Qing-kai(边庆凯) 《Acta Seismologica Sinica(English Edition)》 CSCD 2004年第z1期163-171,共9页
By analyzing the relationship between ground water behavior and strong seismic activity during the past more than 20 years in North China, we have found similar water level descending variation of a part of wells in ... By analyzing the relationship between ground water behavior and strong seismic activity during the past more than 20 years in North China, we have found similar water level descending variation of a part of wells in the short-term stage before several strong earthquakes. The characteristics of anomaly are: at the beginning, water level dropped abruptly or accelerated to drop; then it turned to slow rising with a smaller amplitude than that of descending; earthquakes occurred during the slow-rising process of water level, and at that time or before earthquake occurrence, water level rose with a large amplitude. Among more than 100 wells in North China, the descending anomalies were not recorded for many times, but similar variation processes of water level were noted at different wells before several strong earthquakes, which proves that seismic precursory anomalies of ground water are of certain recurrence features, occurring repeatedly before different strong earthquakes. Therefore, it is necessary to study the genesis of this type of anomaly and its relationship with strong seismic activity. 展开更多
关键词 North china strong earthquake dynamic state of water level short-term stage RECURRENCE
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Insight into Financial Support for Rural Land Circulation:A Case Study of China Taiwan
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作者 SHEN Qi HU Zi-jun 《Asian Agricultural Research》 2012年第10期42-44,共3页
Based on the background of the second rural land reform in China Taiwan, we analyzed financial support measures and their effects. It comes to the insight into financial support for rural land circulation in China Tai... Based on the background of the second rural land reform in China Taiwan, we analyzed financial support measures and their effects. It comes to the insight into financial support for rural land circulation in China Taiwan for the new round of rural land reform in China mainland. It is proposed to: (i) put forth effort on rural infrastructure construction with financial special fund as major support and credit fund from policy bank as supplementary support; (ii) improve rural land evaluation, registration and guarantee systems and set up special loan for land circulation, to solve the problem of shortage of fund for farmers purchasing land; (iii) grant operating loans for rural large planting and breeding farmer households, to accelerate land circulation becoming effective; (iv) establish development fund for agriculture, farmers and rural areas, to ensure sustainable input into rural areas. 展开更多
关键词 china taiwan china MAinLAND RURAL LAND CIRCULATION
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Numerical study on interaction between eddies and the Kuroshio Current east of Taiwan,China
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作者 Yunlong SHI Dezhou YANG Yijun HE 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2021年第2期388-402,共15页
We investigated the interaction between mesoscale eddies and the Kuroshio Current east of Taiwan,China,using a fine-resolution regional general circulation model.Mesoscale eddies are injected into a region east of Tai... We investigated the interaction between mesoscale eddies and the Kuroshio Current east of Taiwan,China,using a fine-resolution regional general circulation model.Mesoscale eddies are injected into a region east of Taiwan,China,according to the quasi-geostrophic theory of stratified fluids.Modeled eddies propagated westward at the velocity of the first baroclinic mode Rossby wave.When eddies collide with the Kuroshio Current east of Taiwan,China,the spatial structure and volume transport of the Kuroshio Current shows a significant variation.The upper 600 m of the anticyclonic eddy cannot cross the Kuroshio Current to reach the region west of the Kuroshio Current;rather,these waters flow northward along the eastern side of the Kuroshio Current.The upper water carried by the anticyclonic eddies cannot reach the shelf of the East China Sea(ECS).In contrast,the waters in the upper layer of the cyclonic eddy reach the western side of the Kuroshio Current and then flow northward.The dynamic mechanism analysis shows that the interaction between the Kuroshio Current and the cyclonic(anticyclonic)eddy decrease(increase)the horizontal potential vorticity(PV)gradient,or PV barrier,whereby the cyclonic(anticyclonic)eddy can(cannot)cross the Kuroshio Current.This study implies that the continental shelf could potentially be influenced by cyclonic eddies in the open ocean,which can transport heat and material from the upper open ocean across the Kuroshio Current to the shelf waters. 展开更多
关键词 mesoscale eddies KUROSHIO eddy-Kuroshio interaction east of taiwan china
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A Preliminary Study on the Probabilistic Estimation of Deaths from Future Earthquakes in North China
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作者 Fu ZhengxiangCenter for Analysis and Prediction,SSB,Beijing 100036,China 《Earthquake Research in China》 1995年第4期122-131,共10页
During the period from 1800 to 1989,the degree of fatalities(?from earthquakes in North China(Lat.34.0°-42.0°N,Long.107.5°-125.0°E)varied exponentially with the frequency of earthquake events(N),na... During the period from 1800 to 1989,the degree of fatalities(?from earthquakes in North China(Lat.34.0°-42.0°N,Long.107.5°-125.0°E)varied exponentially with the frequency of earthquake events(N),namely:N=37.71 exp(-0.72?(E-logD,D:deaths).For the periods from 1988 to 1998 and from 1999 to 2009,the probabilities for earthquakes to cause one thousand or more deaths in North China are estimated to be 0.37 and 0.50,respectively,by using the Gumbel’s extreme value theory. 展开更多
关键词 SEISMIC DISASTER prediction probability estimation fatalities from earthquake NORTH china
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The Taiwan Question China From the Perspective of International Crisis Management:History and Future
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作者 ZHANG Sheng WU Zhengru 《International Relations and Diplomacy》 2023年第4期190-194,共5页
The Taiwan Question China discussed in this paper belongs to the theoretical crisis discussion on international relations and does not regard the Cross-Strait relations as relations between different countries.The out... The Taiwan Question China discussed in this paper belongs to the theoretical crisis discussion on international relations and does not regard the Cross-Strait relations as relations between different countries.The outcome of the 2024 Taiwan Election has a great impact on the Taiwan question,the latest poll shows that the possibility of the Democratic Progressive Party(DPP)candidate to come to power is still very high,because its political evolution trend of Taiwan independence still exists. 展开更多
关键词 taiwan Question china international crisis management taiwan history
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