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姣夏长听
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作者 王尔琪 《小雪花(初中高分作文)》 2016年第6期54-54,共1页
人皆苦炎热,我喜欢夏日长。——题记又是一个闷夏,回到落寞的老屋,物是人非.
关键词 中学教育 语文 作文 《姣夏长听》
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《黄帝内经》脏腑气机理论 被引量:11
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作者 罗鹏飞 任红艳 《河南中医》 2019年第2期173-175,共3页
《黄帝内经》认为,五脏功能的发挥以气机为核心。脏腑气机升降相因,出入有序,则能维持机体"阴平阳秘"的平衡状态。血的生成和运行与脏腑气机密切相关,脏腑气机协调有序,则血循其道,有条不紊。津液的输布代谢,乃是诸脏腑气机... 《黄帝内经》认为,五脏功能的发挥以气机为核心。脏腑气机升降相因,出入有序,则能维持机体"阴平阳秘"的平衡状态。血的生成和运行与脏腑气机密切相关,脏腑气机协调有序,则血循其道,有条不紊。津液的输布代谢,乃是诸脏腑气机协调完成的,尤以肺、脾、肾三脏的气机调节为关键,故气的升降出入是人体脏腑经络功能活动的保障,若气机失调,可影响到全身脏腑经络的功能。治疗疾病时,需要通过调理经脉,令气血调畅,进而使脏腑气机调和,安定有序。四季养生之道在于顺应脏腑气机的春生、夏长、秋收、冬藏特性以防脏腑病变的发生。 展开更多
关键词 《黄帝内经》 脏腑气机 升降出入 春生 夏长 秋收 冬藏
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Effects of a New Long-term Controlled-release Fertilizer on Growth and Development and Yield of Summer Maize 被引量:3
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作者 史桂芳 董浩 +4 位作者 毕军 夏光利 朱国梁 牟小翎 孙国波 《Agricultural Science & Technology》 CAS 2016年第10期2300-2302,2307,共4页
[Objective] The aim was to select the optimal amount of controlled-release fertilizer and provide theoretical references for controlled-release fertilizers use in summer maize. [Method] Long-term controlled-release fe... [Objective] The aim was to select the optimal amount of controlled-release fertilizer and provide theoretical references for controlled-release fertilizers use in summer maize. [Method] Long-term controlled-release fertilizers were applied once at sowing summer maize to explore effects on maize growth, yield, economic profits and environment. [Result] Maize yield reduced a little in the treatment group with 60% CRF, and increased in varying degrees in the rest groups in the range of 1.1%-7.4%, and some showed significant differences. [Conclusion] Controlled-release fertilizers can be applied once at the amount of 80% common fertilizer's, with con- sideration of maize yield, nitrogen use rate and economic profits, which is beneficial for summer maize application and promotion in North China. 展开更多
关键词 Long-term controlled release fertilizer Summer maize YIELD Nitrogen fertilizer use rate
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Effects of Enhanced Ultraviolet Radiation-B on Maize in Arid Regions of Middle-high Elevation 被引量:13
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作者 张磊 王连喜 +2 位作者 李福生 车晶晶 杜宏娟 《Agricultural Science & Technology》 CAS 2009年第1期11-14,73,共5页
[Objective] The experiment aimed to explore the influence of enhanced ultraviolet radiation-B on maize in arid regions of middle-high elevation for correct assessing the influence of enhanced ultraviolet radiation-B o... [Objective] The experiment aimed to explore the influence of enhanced ultraviolet radiation-B on maize in arid regions of middle-high elevation for correct assessing the influence of enhanced ultraviolet radiation-B on maize and providing scientific reference to make proper countermeasures. [ Method] The location test in field and lift lamp of UV-B were used to observe the changes of maize height, leaf area and number of green leaves under influences of different UV-B radiation. [ Result] In arid regions of middle-high elevation, enhanced ultraviolet radiation-B could dwarf maize plant, decrease leaf area, decline number of green leaves and yield. The reason of decreasing leaf area was that enhanced ultraviolet radiation-B shortened leaf length and leaf width while the reason of declining yield was that yield components were all negatively influ- enced and with the increase of ultraviolet radiation-B, the yield declined dramatically. [ Concluslonl The result of this experiment would be good for maize production in arid regions of middle-high elevation. 展开更多
关键词 UV-B Middle-high elevation Arid area MAIZE
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浅谈中国古典园林建筑的时空观
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作者 韩尚春 《四川建材》 2010年第1期171-173,共3页
本文通过对中国传统文化、古典绘画中的时空观的剖析,来揭示中国古典园林中建筑布局的思想背景,并通过对中国江南古典园林的建筑空间布局分析,揭示其布局的特点。
关键词 阴阳五行 时空统一 建筑空间 春生 夏长 秋收 冬藏
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Relationship between the Late Spring NAO and Summer Extreme Precipitation Frequency in the Middle and Lower Reaches of the Yangtze River 被引量:9
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作者 TTIAN Bao-Qiang FAN Ke 《Atmospheric and Oceanic Science Letters》 2012年第6期455-460,共6页
The relationship between the late spring North Atlantic Oscillation (NAO) and the summer extreme precipitation frequency (EPF) in the middle and lower reaches of the Yangtze River Valley (MLYRV) is examined using an N... The relationship between the late spring North Atlantic Oscillation (NAO) and the summer extreme precipitation frequency (EPF) in the middle and lower reaches of the Yangtze River Valley (MLYRV) is examined using an NECP/NCAR reanalysis dataset and daily precipitation data from 74 stations in the MLYRV. The results show a significant negative correlation between the May NAO index and the EPF over the MLYRV in the subsequent summer. In positive EPF index years, the East Asian westerly jet shifts farther southward, and two blocking high positive anomalies appear over the Sea of Okhotsk and the Ural Mountains. These anomalies are favorable to the cold air from the mid-high latitudes invading the Yangtze River Valley (YRV). The moisture convergence and the ascending motion dominate the MLYRV. The above patterns are reversed in negative EPF index years. A wave train pattern that originates from the North Atlantic extends eastward to the Mediterranean and then moves to the Tibetan Plateau and from there to the YRV, which is an important link in the May NAO and the summer extreme precipitation in the MLYRV. The wave train may be aroused by the tripole pattern of the SST, which can explain why the May NAO affects the summer EPF in the MLYRV. 展开更多
关键词 North Atlantic Oscillation summer extreme precipitation frequency the middle and lower reaches of the Yangtze River Valley East Asian westerly jet
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An Observational Analysis of the Relationship Between Wind and the Expansion of the Changjiang River Diluted Water during Summer 被引量:2
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作者 LIU Bao-Chao FENG Li-Cheng 《Atmospheric and Oceanic Science Letters》 2012年第5期384-388,共5页
This paper presents an analysis of the impact of wind on the transport of the Changiiang River Diluted Water (CRDW) in August by using the salinity data col- lected on two zonal sections near Cheju-do. Based on the ... This paper presents an analysis of the impact of wind on the transport of the Changiiang River Diluted Water (CRDW) in August by using the salinity data col- lected on two zonal sections near Cheju-do. Based on the climatological mean conditions and four extreme events, the analysis indicates that wind-induced Ekman transport plays an important role in the extension of the CRDW. The strong northeastward Ekman transport induced by southeasterly wind in 1996, 2003, 2004, and 2006 pushes the core of the CRDW to the sea adjacent to Cheju-do. A comparison of the wind variation before observation among these four extreme events indicates that the expan- sion pattern of the CRDW is primarily changed by synop- tic variation with tirnescales of days to weeks, such as during a typhoon. The weak eastward extension of the CRDW in 2004, accompanied with a relatively strong southerly wind, implies that the oceanographic state (e.g., the depth of halocline) may strongly affect the impact of wind on the extension of the CRDW. 展开更多
关键词 Changjiang River diluted water WIND Ekmantransport
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Study on Nutrient Limitation of Phytoplankton in the Field Experiment of the Yangtze River Estuary in Summer 被引量:1
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作者 赵卫红 李金涛 王江涛 《Marine Science Bulletin》 CAS 2005年第2期13-20,共8页
From July 23rd to August 15th, 2001, a field cultivation experiment was carried out to determine the limitation factors of phytoplankton in the Yangtze River estuary and the adjacent areas. The results indicated that ... From July 23rd to August 15th, 2001, a field cultivation experiment was carried out to determine the limitation factors of phytoplankton in the Yangtze River estuary and the adjacent areas. The results indicated that the potential limiting nutrient was phosphorus in the Yangtze River diluted water area, nitrogen in the offshore of the Yangtze River estuary and the conversion of phosphorus to nitrogen in the middle area. Iron and silicon were not the potential limiting factors. If there were some kinds of limiting factors in the water, the growth of phytoplankton would be limited obviously. In case of disappearance of the limiting factor, the phytoplankton would grow fast. When the Noctiluca scintiuans bloom occurred, the phytoplankton biomass level was very low in a short time due to the grazing pressure. When the grazing pressure disappeared, the phytoplankton would grow quickly in abundant nutrients condition. 展开更多
关键词 the Yangtze River estuary PHYTOPLANKTON nutrient limitation
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Macrobenthic assemblages of the Changjiang River estuary (Yangtze River, China) and adjacent continental shelf relative to mild summer hypoxia 被引量:4
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作者 廖一波 寿鹿 +4 位作者 汤雁滨 曾江宁 高爱根 陈全震 严小军 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2017年第3期481-488,共8页
To assess the effects of hypoxia, macrobenthic communities along an estuarine gradient of the Changjiang estuary and adjacent continental shelf were analyzed. This revealed spatial variations in the communities and re... To assess the effects of hypoxia, macrobenthic communities along an estuarine gradient of the Changjiang estuary and adjacent continental shelf were analyzed. This revealed spatial variations in the communities and relationships with environmental variables during periods of reduced dissolved oxygen (DO) concentration in summer. Statistical analyses revealed significant differences in macrobenthic community composition among the three zones: estuarine zone (EZ), mildly hypoxic zone (MHZ) in the continental shelf, and norrnoxic zone (NZ) in the continental shelf(Global R=0.206, P=0.002). Pairwise tests showed that the macrobenthic community composition of the EZ was significantly different from the MHZ (pairwise test R=0.305, P=0.001) and the NZ (pairwise test R=0.259, P=-0.001). There was no significant difference in macrobenthic communities between the MHZ and the NZ (pairwise test R=0.062, P=-0.114). The taxa included small and typically opportunistic polychaetes, which made the greatest contribution to the dissimilarity between the zones. The effects of mild hypoxia on the macrobenthic communities are a result not only of reduced DO concentration but also of differences in environmental variables such as temperature, salinity, and nutrient concentrations caused by stratification. 展开更多
关键词 HYPOXIA MACROBENTHOS benthic community Changjiang estuary low dissolved oxygen
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Potential vorticity analysis of quasi-biweekly rainfall events over the Yangtze Basin in summer 2014 被引量:1
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作者 Chang Tang Xiaofei Wu +1 位作者 Guanshun Zhang Jiangyu Mao 《Atmospheric and Oceanic Science Letters》 CSCD 2021年第6期20-27,共8页
A series of heavy rainfall events occurred over the Yangtze River Valley(YRV)in summer 2014,which were modulated by the 10-20-day quasi-biweekly oscillation(QBWO).Thus,the strongest QBWO cycle for the period 10-24 Jul... A series of heavy rainfall events occurred over the Yangtze River Valley(YRV)in summer 2014,which were modulated by the 10-20-day quasi-biweekly oscillation(QBWO).Thus,the strongest QBWO cycle for the period 10-24 July was used as a representative case to reveal the dynamical mechanism for the QBWO of the YRV rainfall from the potential vorticity(PV)perspective and based on MERRA-2 reanalysis data.The quasi-biweekly YRV rainfall was found to depend closely on the QBWO of the upper-tropospheric South Asian high(SAH),with the SAH configuration modified by the southward-intruding midlatitude high PV stream along with southwestward-advected high PV,altering the divergent condition over the YRV.Quantitative diagnoses for the anomalous vertical motion demonstrated that,in the wet phase of the QBWO cycle,the upper-tropospheric southward-intruding high PV stream acted as a positive PV advection,while negative PV advection was generated due to the lower-tropospheric southerlies,thereby forming a positive vertical gradient of horizontal PV advection to induce evident isentropic-displacement ascending motion.On the other hand,the southward-intruding high PV stream extended downward to the middle troposphere,causing the isentropic surfaces to become more sloping,thus producing a strong isentropic-gliding ascending component.Subsequently,the stronger diabatic heating-related ascending motion was induced to generate positive rainfall anomalies over the YRV.The opposite situation arose in the dry phase,with weak descending motion in magnitude. 展开更多
关键词 Quasi-biweekly oscillation Summer Yangtze rainfall Potential vorticity Vertical motion
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A Typical Mode of Seasonal Circulation Transition: A Climatic View of the Abrupt Transition from Drought to Flood over the Middle and Lower Reaches of the Yangtze River Valley in the Late Spring and Early Summer of 2011 被引量:3
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作者 ZONG Hai-Feng BUEH Cholaw +2 位作者 CHEN Lie-Ting JI Li-Ren WEI Jie 《Atmospheric and Oceanic Science Letters》 2012年第5期349-354,共6页
In this study, the seasonal transition of precipitation over the middle and lower reaches of the Yang-tze River Valley (YRV) from late spring to early summer is investigated. The results show that the seasonal transit... In this study, the seasonal transition of precipitation over the middle and lower reaches of the Yang-tze River Valley (YRV) from late spring to early summer is investigated. The results show that the seasonal transition of precipitation exhibits multi-modes. One of these modes is characterized by an abrupt transition from drought to flood (ATDF) over the middle and lower reaches of the YRV in the seasonal transition of precipitation. It is shown that the ATDF event from May to June 2011 is simply one prominent case of the ATDF mode. The ATDF mode exhibits an obvious decadal variability. The mode has occurred more frequently since 1979, and its amplitude has apparently strengthened since 1994. From the climatic view, the ATDF mode configures a typical seasonal circulation transition from winter to summer, for which the winter circulations are prolonged, and the summer circulations with the rainy season are built up early over the YRV. 展开更多
关键词 abrupt transition from drought to flood ex-tended empirical orthogonal function seasonal transition
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DECADAL CLIMATE VARIABILITY OF RAINFALL AROUND THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER AND ATMOSPHERIC CIRCULATION 被引量:1
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作者 王亚非 高桥清利 荣艳淑 《Journal of Tropical Meteorology》 SCIE 2005年第2期169-177,共9页
This study examined the rainfall around the middle and lower reaches of the Yangtze River and related atmospheric circulation by using NCEP reanalysis data. The purpose of this study is to analyze their decadal variat... This study examined the rainfall around the middle and lower reaches of the Yangtze River and related atmospheric circulation by using NCEP reanalysis data. The purpose of this study is to analyze their decadal variation and the relationship among rainfall, atmospheric circulation around East Asia and the ENSO episodes. Current results are presented as follows: (1) Very clear increasing trend of the rainfall around the middle and low reaches of the Yangtze River during the Meiyu period and June to July is found in the recent 15 years. Meanwhile, the geopotential height at 500 hPa around the Okhotsk Sea also holds similar increasing trend. It is noticeable that ENSO episodes tend to occur more frequently in the recent 15 years. (2) An index describing East Asian summer monsoon is well correlated with the SST in the Nino-3 region in preceding autumn in the recent 20 years but is not prior to the period. This means that the El Nino phenomenon exerts more impacts on East Asian summer monsoon recently. (3) The warm phase of PDO in the recent 20 years basically coincides with the increasing trend of the atmospheric circulation in East Asia. 展开更多
关键词 East Asian summer monsoon decadal variation MEIYU
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Inorganic Carbon Parameters Responding to Summer Hypoxia Outside the Changjiang Estuary and the Related Implications 被引量:6
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作者 WANG Bin CHEN Jianfang +2 位作者 JIN Haiyan LI Hongliang XU Jie 《Journal of Ocean University of China》 SCIE CAS 2013年第4期568-576,共9页
The eutrophication, hypoxia and coastal acidification are attracting more and more attention. In this study, inorganic carbon parameters, including dissolved inorganic carbon (DIC), total alkalinity (TA) and calcu... The eutrophication, hypoxia and coastal acidification are attracting more and more attention. In this study, inorganic carbon parameters, including dissolved inorganic carbon (DIC), total alkalinity (TA) and calculated partial pressure of CO2 (pCO2), obtained from a summer cruise in August, 2009, were used to investigate their integrated response to biological processes accompanying the oxygen depletion in the areas off the Changjiang Estuary. According to the observations, the typical hypoxia occurred in the bottom water just outside the Changjiang Estuary with Dissolved Oxygen (DO) lower than 2.00 mg L^-1. The biological uptake in the surface water and the decomposition of organic matter in the bottom water were fully coupled with each other. The high concentration of Chl_a (Chl_a = 10.9μgL^-1) and DO (9.25 mgL^-1), profoundly decreased DIC concentration 0828 μmolkg^-1) and elevated pH (8.42) was observed in the surface water. The correspondingly increased DIC and depletion of oxygen were observed in the bottom water. The semi-quantitative analysis proved that the locally-produced phytoplankton, determined by primary productivity, was deposited to the bottom and contributed about 76% of total amount of the organic carbon decomposition in the bottom. However, in the bottom hypoxia (DO = 2.05 mgL^-1) area observed in the Southern Zhejiang coastal water, the responding patterns of inorganic carbon parameters deviated from the previous one. The expanding of Changjiang Diluted Water (CDW), the adding of Hangzhou Bay water (with high DIC concentration) and Coastal Current together modify the DIC background value in this area, and the local degeneration and upwelling process may also help to offset the local DIC removed by net biological uptake in surface water. In addition when the mixing occurring in autumn, which may break the summer stratification, the excess release of high DIC in the bottom water to the subsurface water could have an important influence on coastal acidification and the CO2 uptake capacity in this area. 展开更多
关键词 dissolved inorganic carbon (DIC) biological uptake HYPOXIA coastal acidification
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Influence of the Convection over the South China Sea on the Summer Precipitation of Shandong Province 被引量:3
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作者 ZHANGSuping LIUQinyu +1 位作者 GONGDianli LIUShijun 《Journal of Ocean University of China》 SCIE CAS 2004年第1期23-32,共10页
The pentad average minimum outgoing longwave radiation (OLR) data over the northern South China Sea (SCS) are selected as indexes to analyze the intensity of the convection connected with the SCS monsoon onset. Statis... The pentad average minimum outgoing longwave radiation (OLR) data over the northern South China Sea (SCS) are selected as indexes to analyze the intensity of the convection connected with the SCS monsoon onset. Statistic analysis demonstrates that the index can account for the intensity of the SCS monsoon about, at least, 75%. A significant negative correlation (confident level over 90%) between Shandong’s summer rainfall and the index is found only in the period of 24-26 pentads and limited to the area above the deeper water basin of the SCS (10°-20°N, 110°-117.5°E). Thus the minimum OLR over the deeper water basin during 24-26 pentads can be used as a valuable predictor for the long lead forecast of the precipitation. The 500 hPa geopotential height data in the Northern Hemisphere for the period from 1951 to 2000 are used in order to characterize the physical mechanisms involved. The composite anomalies of the 500 hPa level allow for the identification and detection of the teleconnection of the East Asia North America (EAP) pattern that is responsible to some extent for the interannual variability of the precipitation of Shandong Province. Besides, the interannual differences of the intraseasonal variations (ISV) of OLR and their northward transmission probably make a contribution to the position of the subtropical high which is vital for the summer rainfall in the province. 展开更多
关键词 convection intensity South China Sea interannual variations summer rainfall Shandong Province OLR
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Numerical Simulation of the Heavy Rainfall in the Yangtze-Huai River Basin during Summer 2003 Using the WRF Model 被引量:13
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作者 LIU Hong-Bo 《Atmospheric and Oceanic Science Letters》 2012年第1期20-25,共6页
In this study, a 47-day regional climate simulation of the heavy rainfall in the Yangtze-Huai River Basin during the summer of 2003 was conducted using the Weather Research and Forecast (WRY) model. The simulation r... In this study, a 47-day regional climate simulation of the heavy rainfall in the Yangtze-Huai River Basin during the summer of 2003 was conducted using the Weather Research and Forecast (WRY) model. The simulation reproduces reasonably well the evolution of the rainfall during the study period's three successive rainy phases, especially the frequent heavy rainfall events occurring in the Huai River Basin. The model captures the major rainfall peak observed by the monitoring stations in the morning. Another peak appears later than that shown by the observations. In addition, the simulation realistically captures not only the evolution of the low-level winds but also the characteristics of their diurnal variation. The strong southwesterly (low-level jet, LLJ) wind speed increases beginning in the early evening and reaches a peak in the morning; it then gradually decreases until the afternoon. The intense LLJ forms a strong convergent circulation pattern in the early morning along the Yangtze-Huai River Basin. This pattern partly explains the rainfall peak observed at this time. This study furnishes a basis for the further analysis of the mechanisms of evolution of the LLJ and for the further study of the interactions between the LLJ and rainfall. 展开更多
关键词 heavy rainfall Yangtze-Huai River Basin the Weather Research and Forecast model low-level jet
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Statistically Downscaled Summer Rainfall over the Middle-Lower Reaches of the Yangtze River 被引量:6
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作者 GUO Yan LI Jian-Ping LI Yun 《Atmospheric and Oceanic Science Letters》 2011年第4期191-198,共8页
The summer rainfall over the middle-lower reaches of the Yangtze River valley (YRSR) has been estimated with a multi-linear regression model using principal atmospheric modes derived from a 500 hPa geopotential height... The summer rainfall over the middle-lower reaches of the Yangtze River valley (YRSR) has been estimated with a multi-linear regression model using principal atmospheric modes derived from a 500 hPa geopotential height and a 700 hPa zonal vapor flux over the domain of East Asia and the West Pacific.The model was developed using data from 1958 92 and validated with an independent prediction from 1993 2008.The independent prediction was efficient in predicting the YRSR with a correlation coefficient of 0.72 and a relative root mean square error of 18%.The downscaling model was applied to two general circulation models (GCMs) of Flexible Global Ocean-Atmosphere-Land System Model (FGOALS) and Geophysical Fluid Dynamics Laboratory coupled climate model version 2.1 (GFDL-CM2.1) to project rainfall for present and future climate under B1 and A1B emission scenarios.The downscaled results pro-vided a closer representation of the observation compared to the raw models in the present climate.In addition,compared to the inconsistent prediction directly from dif-ferent GCMs,the downscaled results provided a consistent projection for this half-century,which indicated a clear increase in the YRSR.Under the B1 emission scenario,the rainfall could increase by an average of 11.9% until 2011 25 and 17.2% until 2036 50 from the current state;under the A1B emission scenario,rainfall could increase by an average of 15.5% until 2011 25 and 25.3% until 2036 50 from the current state.Moreover,the increased rate was faster in the following decade (2011 25) than the latter of this half-century (2036 50) under both emissions. 展开更多
关键词 statistical downscaling summer rainfall Yangtze River future scenario
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Growth Modeling of Charolais and Serrana Soriana Native Spanish Beef Cattle
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作者 J. A. Miguel J. Ciria J. L. Calvo B. Asenjo 《Journal of Agricultural Science and Technology(A)》 2011年第5期778-782,共5页
The alternative productions, increasingly importance, are based on the rational utilization of the resources, on agreement with the environment and the use of autochthonous breeds that many cases are found in danger o... The alternative productions, increasingly importance, are based on the rational utilization of the resources, on agreement with the environment and the use of autochthonous breeds that many cases are found in danger of disappearance, due to the tact that their suckling is not economically profitable. A way of predicting and knowing the growth of the animals is using mathematical models. This work presented the results of the estimate of the growth according to the Gompertz-Laird model of males of the atttochthonous breed Serrana Soriana and Charolais. The weight to the birth of the breed calfs Charolais (45.14 kg), was superior to those of Serrana Soriana (40.13 kg), and presented a greater relative growth (9.9%) before the inflection point of the growth curve: furthermore it ~as also superior to the maximum decline relative after this point (6%), Serrana Soriana reached 7 days after the maximum growth point but with a smaller weight (315.05 kg vs 384.76 kg). It was calculated a weight to the maturity of 1 ,(176.91) kg for Charolais and 856.40 kg for Serrana Soriana. 展开更多
关键词 Alternative productions Gompertz-Laird growth curve beef cattle.
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pCO_2 distribution and CO_2 flux on the inner continental shelf of the East China Sea during summer 2011 被引量:2
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作者 曲宝晓 宋金明 +3 位作者 李学刚 袁华茂 李宁 马清霞 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2013年第5期1088-1097,共10页
Measurements ofpH, total alkalinity (TA), partial pressure of CO2 (pCO2) and air-sea CO2 flux (FCO2) were conducted for the inner continental shelf of the East China Sea (ECS) during August 2011. Variations in... Measurements ofpH, total alkalinity (TA), partial pressure of CO2 (pCO2) and air-sea CO2 flux (FCO2) were conducted for the inner continental shelf of the East China Sea (ECS) during August 2011. Variations in pCO2 distribution and FCO2 magnitude during the construction of the Three Gorges Dam (TGD) (2003-2009), and the potential effects of the TGD on the air-sea CO2 exchange were examined. Results showed that the ECS acts as an overall CO2 sink during summer, with pCO2 ranging from 107 to 585 p.atm and an average FCO2 of -6.39 mmol/(m2·d). Low pCO2 (〈350 μatm) levels were observed at the central shelf (28°-32°N, 123°-125.5°E) where most CO2-absorption occurred. HighpCO2 (〉420 μatm) levels were found in the Changjiang estuary and Hangzhou Bay which acted as the main CO2 source. A negative relationship between pCO2 and salinity (R2=0.722 0) in the estuary zone indicated the predominant effect of the Changjiang Diluted Water (CDW) on the seawater CO2 system, whereas a positive relationship (R2=0.744 8) in the offshore zone revealed the influence of the Taiwan Current Warm Water (TCWW). Together with the historical data, our results indicated that the CO2 sink has shown a shift southwest while FC02 exhibited dramatic fluctuation during the construction of the TGD, which is located in the middle reaches of the Changjiang. These variations probably reflect fluctuation in the Changjiang runoff, nutrient import, phytoplankton productivity, and sediment input, which are likely to have been caused by the operations of the TGD. Nevertheless, the potential influence of the TGD on the CO2 flux in the ECS is worthy of further study. 展开更多
关键词 carbon dioxide exchange flux continental shelf East China Sea Three Gorges Dam
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Inter-decadal variations,causes and future projection of the Asian summer monsoon 被引量:9
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作者 Ding Yihui Si Dong +2 位作者 Sun Ying Liu Yanju Song Yafang 《Engineering Sciences》 EI 2014年第2期22-28,共7页
The present paper presents a concise summary of our recent studies on the Asian summer monsoon,with highting decadal and inter- decadal scales. The studies on the long- term variations of the Asian summer monsoon and ... The present paper presents a concise summary of our recent studies on the Asian summer monsoon,with highting decadal and inter- decadal scales. The studies on the long- term variations of the Asian summer monsoon and its impacts on the change in the summer precipitation in China are reviewed. Moreover,recent changes in the Asian summer monsoon and summer precipitation in East Asia(including Meiyu precipitation)are discussed. Finally,the future changes of the Asian summer monsoon are also pointed out in this paper. 展开更多
关键词 inter-decadal variations Asian summer monsoon PRECIPITATION
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The Relationship between the Interdecadal Variation of Summer Precipitation and Its Interannual Variability over the Middle and Lower Reaches of the Yangtze River Valley 被引量:3
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作者 FU Yuan-Hai 《Atmospheric and Oceanic Science Letters》 CSCD 2015年第3期127-133,共7页
The intensity of summer precipitation interannual variability is strongest over the middle and lower reaches of the Yangtze River Valley(MLYRV). The variability is larger than 1.5 mm d–1 and up to 35%–40% of the cli... The intensity of summer precipitation interannual variability is strongest over the middle and lower reaches of the Yangtze River Valley(MLYRV). The variability is larger than 1.5 mm d–1 and up to 35%–40% of the climatological mean summer precipitation. The relationship between the interdecadal change in the intensity of summer precipitation and its interannual variability over this area is investigated, by analyzing five gauged and re-constructed precipitation datasets. The relationship is found to be very weak over the MLYRV, with a correlation coefficient of only approximately 0.10. The Pacific Decadal Oscillation influences the western North Pacific subtropical high, which is responsible for the interdecadal change in summer precipitation over the MLYRV. However, the precipitation interannual variability is closely related to the ENSO events in the preceding winter due to its impact on the meridional displacement of the East Asian westerly jet. Different physical mechanisms cause different interdecadal variation in the intensity of summer precipitation and its interannual variability, and thus result in a poor relationship. 展开更多
关键词 interdecadal variation interannual variability summer precipitation
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