期刊文献+
共找到12篇文章
< 1 >
每页显示 20 50 100
柴北缘马海构造马10井区天然气微生物勘探 被引量:1
1
作者 袁志华 佘家朝 《科学技术与工程》 北大核心 2013年第36期10893-10898,共6页
柴北缘构造较为复杂,研究工区各断块含油、含气前景区显得尤为重要。通过在柴北缘马海构造马10井区进行的油气微生物勘探,采取550组样品进行天然气微生物数量及活性分析,得出该区的油气分布规律和分布范围,通过微生物异常值的分析得出... 柴北缘构造较为复杂,研究工区各断块含油、含气前景区显得尤为重要。通过在柴北缘马海构造马10井区进行的油气微生物勘探,采取550组样品进行天然气微生物数量及活性分析,得出该区的油气分布规律和分布范围,通过微生物异常值的分析得出马10井区微生物异常基本上为气异常,但没有大范围连成片,而油异常区几乎为背景区值。通过较成熟开发区的异常区与研究区内其他异常区微生物异常值进行对比,研究区内异常区的微生物异常值的平均值均没有前者高,合理直观地了解了马10井区的含油气远景。结合该区的区域地质资料,对马10井区进行含气预测,并部署了一口评价建议井。 展开更多
关键词 微生物勘探 马海构造 微生物异常 气异常区 异常
下载PDF
黄骅坳陷港西构造西端歧81断块微生物异常研究 被引量:4
2
作者 袁志华 王明 《地质与勘探》 CAS CSCD 北大核心 2010年第6期1106-1111,共6页
油气微生物勘探(MPOG)技术作为一种新的地表油气勘探方法,以其直接、有效、多解性小且经济等优势日益受到全球油气勘探界的重视。将油气微生物勘探技术应用于港西地区,得出油气分布规律,其基本上为油异常区,且未连片分布,而气异常区基... 油气微生物勘探(MPOG)技术作为一种新的地表油气勘探方法,以其直接、有效、多解性小且经济等优势日益受到全球油气勘探界的重视。将油气微生物勘探技术应用于港西地区,得出油气分布规律,其基本上为油异常区,且未连片分布,而气异常区基本为背景值区。结合区域地质资料、油气井资料以及生物灰岩分布规律等信息,分析歧81断块的主控因素,揭示该断块的油气成藏规律。通过较成熟开发区的异常区与研究区内其它异常区的微生物异常值进行对比,研究区内异常区的微生物异常值的平均值均没有前者高,合理直观地了解了歧81断块的含油气远景。最后指出其主要储层,同时进行了含油性预测,应优先在异常值较强烈的区域进行勘探,并确定了有利的布井点位,从而大大降低勘探风险。 展开更多
关键词 微生物勘探技术 微生物异常 异常 气异常区 含油性预测
下载PDF
Simulation of Extreme Climate Events over China with Different Regional Climate Models 被引量:9
3
作者 FENG Jin-Ming WANG Yong-Li FU Cong-Bin 《Atmospheric and Oceanic Science Letters》 2011年第1期47-56,共10页
During phase II of the Regional Climate Model Inter-comparison Project (RMIP) for Asia, the Asian climate was estimated from July 1988 to December 1998 using six climate models. In this paper, the abilities of six c... During phase II of the Regional Climate Model Inter-comparison Project (RMIP) for Asia, the Asian climate was estimated from July 1988 to December 1998 using six climate models. In this paper, the abilities of six climate models to simulate several important ex- treme climate events in China during the last years of the last century were analyzed. The modeled results for the intensity of the precipitation anomaly over the Yang- tze-Huaihe Valley during the summers of 1991 and 1998 were weaker than the observed values. The positive pre- cipitation anomaly responsible for a catastrophic flood in 1991 was well reproduced in almost all simulation results, but the intensity and range of the precipitation anomaly in 1998 were weaker in the modeled results. The spatial dis- tribution of extreme climate events in 1997, when severe drought affected North China and flood impacted South China, was reproduced by most of the regional models because the anomaly of the large-scale background field was well-simulated, despite poor simulation of high temperature areas in the north during the summer by all models. 展开更多
关键词 RMIP extreme climate event FLOOD DROUGHT spatial distribution
下载PDF
Analysis of climatic features and major meteorological disasters over the Three Gorges Region of the Yangtze River Basin in 2021 被引量:2
4
作者 Tong Cui Xianyan Chen +3 位作者 Xukai Zou Qiang Zhang Hongling Zeng Linhai Sun 《Atmospheric and Oceanic Science Letters》 CSCD 2022年第6期57-63,共7页
Based on daily observation data in the Three Gorges Region(TGR)of the Yangtze River Basin and global reanalysis data,the authors analyzed the climate characteristics and associated temporal variations in the main mete... Based on daily observation data in the Three Gorges Region(TGR)of the Yangtze River Basin and global reanalysis data,the authors analyzed the climate characteristics and associated temporal variations in the main meteorological factors in 2021,as well as the year’s climatic events and meteorological disasters.The 2021 average temperature was 0.2℃above the 1991-2020 average and the 13 th-warmest year since 1961.Seasonally,winter and autumn were both warmer than usual.The annual mean precipitation was 12.8%above normal,and most regions experienced abundant rainfall throughout the year.The seasonal variation in precipitation was significant and the TGR had a wetter-than-normal spring and summer.The number of rainstorm days was higher than normal;the wind speed was above normal;and the relative humidity was higher than normal.In terms of rain acidity,2021 was tied with 2020 as the lowest since 1999.From mid-September to early October 2021,the TGR experienced exceptional high-temperature weather,which was driven by abnormal activity of mid-and high-latitude atmospheric circulation over the Eurasian continent and the western Pacific subtropical high(WPSH).In addition,a strong blocking high over the Ural Mountains accompanied by intense mid-latitude westerly winds prevented cyclonic disturbances from extending to the subtropical region.As a result,under the combined effect of the weaker-than-normal cold-air activities and the anomalous WPSH,the TGR experienced extreme high-temperature weather during early autumn 2021. 展开更多
关键词 Three Gorges Region Climatic anomaly Weather and climate events Extremely warm early autumn
下载PDF
Abrupt Climate Changes of Holocene 被引量:7
5
作者 WANG Shaowu GE Quansheng +2 位作者 WANG Fang WEN Xinyu HUANG Jianbin 《Chinese Geographical Science》 SCIE CSCD 2013年第1期1-12,共12页
This paper is a review of studies of abrupt climate changes(ACCs) during the Holocene published during the past ten years.North Atlantic cold events are indicators of ACCs.As indicated by North Atlantic ice-rafted deb... This paper is a review of studies of abrupt climate changes(ACCs) during the Holocene published during the past ten years.North Atlantic cold events are indicators of ACCs.As indicated by North Atlantic ice-rafted debris(IRD),there were nine confirmed cold events during the Holocene,occurring at 11.1 kyr,10.3 kyr,9.4 kyr,8.1 kyr,5.9 kyr,4.2 kyr,2.8 kyr,1.4 kyr,and 0.4 kyr respectively according to most representative results from Bond et al.(1997).However,the identification of chronology has been made with some uncertainties.Considerable climatic proxy data have shown that,during the cold events,substantial climate abnormalities have occurred widely across the globe,particularly in the areas surrounding the North Atlantic.These abnormalities were in the form of high-latitude cold in the both hemispheres,expansion of the Westerlies to low latitudes,drought in the monsoon regions,recession of summer monsoons,and intensification of the winter monsoons.Studies have indicated that the four ACCs occurring in the early Holocene may be related to freshwater pulses from ice melting in the northern part of the North Atlantic,and the other five ACCs that occurred during the middle and late Holocene may be related to the decreased solar activity. 展开更多
关键词 HOLOCENE abrupt climate change cold event North Atlantic
下载PDF
ENSO cycle and climate anomaly in China 被引量:4
6
作者 陈永利 赵永平 +1 位作者 冯俊乔 王凡 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2012年第6期985-1000,共16页
The inter-annual variability of the tropical Pacific Subsurface Ocean Temperature Anomaly (SOTA) and the associated anomalous atmospheric circulation over the Asian North Pacific during the E1 Nifio-Southern Oscilla... The inter-annual variability of the tropical Pacific Subsurface Ocean Temperature Anomaly (SOTA) and the associated anomalous atmospheric circulation over the Asian North Pacific during the E1 Nifio-Southern Oscillation (ENSO) were investigated using National Centers for Environmental Prediction/ National Center for Atmospheric Research (NCEP/NCAR) atmospheric reanalysis data and simple ocean data simulation (SODA). The relationship between the ENSO and the climate of China was revealed. The main results indicated the following: 1) there are two ENSO modes acting on the subsurface tropical Pacific. The first mode is related to the mature phase of ENSO, which mainly appears during winter. The second mode is associated with a transition stage of the ENSO developing or decaying, which mainly occurs during summer; 2) during the mature phase of E1Nifio, the meridionality of the atmosphere in the mid-high latitude increases, the Aleutian low and high pressure ridge over Lake Baikal strengthens, northerly winds prevail in northern China, and precipitation in northern China decreases significantly. The ridge of the Ural High strengthens during the decaying phase of E1 Nifio, as atmospheric circulation is sustained during winter, and the northerly wind anomaly appears in northern China during summer. Due to the ascending branch of the Walker circulation over the western Pacific, the western Pacific Subtropical High becomes weaker, and south-southeasterly winds prevail over southern China. As a result, less rainfall occurs over northern China and more rainfall over the Changjiang River basin and the southwestern and eastern region of Inner Mongolia. The flood disaster that occurred south of Changjiang River can be attributed to this. The La Nifm event causes an opposite, but weaker effect; 3) the ENSO cycle can influence climate anomalies within China via zonal and meridional heat transport. This is known as the "atmospheric-bridge", where the energy anomaly within the tropical Pacific transfers to the mid-high latitude in the northern Pacific through Hadley cells and Rossby waves, and to the western Pacific-eastern Indian Ocean through Walker circulation. This research also discusses the special air-sea boundary processes during the ENSO events in the tropical Pacific, and indicates that the influence of the subsurface water of the tropical Pacific on the atmospheric circulation may be realized through the sea surface temperature anomalies of the mixed water, which contact the atmosphere and transfer the anomalous heat and moisture to the atmosphere directly. Moreover, the reason for the heavy flood within the Changjiang River during the summer of 1998 is reviewed in this paper. 展开更多
关键词 ENSO cycle tropical Pacific Ocean subsurface ocean temperature anomalies INTERANNUALVARIABILITY climate anomaly of China
下载PDF
CHARACTERISTICS OF ZONAL ANOMALY OF ANNUAL PRECIPITATION IN THE NORTHEASTERN CHINA 被引量:2
7
作者 YANMin-hua DENGWei +1 位作者 CHENPan-qin LIANGLi-qiao 《Chinese Geographical Science》 SCIE CSCD 2004年第4期320-325,共6页
The characteristics of zonal anomaly and change rule of temporal distribution of annual precipitation in the northeastern China are revealed in this paper with EOF (Empirical Orthogonal Function) and REOF (Rotated Emp... The characteristics of zonal anomaly and change rule of temporal distribution of annual precipitation in the northeastern China are revealed in this paper with EOF (Empirical Orthogonal Function) and REOF (Rotated Empirical Orthogonal Function) methods and results are drawn in the standard relief maps with GIS technology for practical application. Data used in the study were obtained from 208 meteorological stations over the northeastern China from 1961 to 2001. EOF results show that the first 3 loading vectors could give entire spatial anomaly structure of annual precipitation. In the Northeast Plain including the Songneng Plain and the Liaohe Plain, there is a regional compatibility (whether wet or dry) of annual precipitation change and this precipitation pattern has occurred since the late 1980s to the present. There also exist annual precipitation patterns of wet (or dry) in south and dry (or wet) in north and wet (or dry) in east and dry (or wet) in west. REOF results display 8 principal precipitation anomaly areas by the first 8 rotated loading vectors: the west plain, the Liaodong hills, the Sanjiang Plain, the Liaoxi hills, the Changbai Mountains, the Hulun Buir Plateau, the southwest plateau and the Liaodong Peninsula. 展开更多
关键词 annual precipitation northeastern China zonal anomaly precipitation characteristics
下载PDF
Northern-Hemisphere Snow Cover Patterns and Formation Conditions in Winter 2007 and 2012
8
作者 CUI Hongyan QIAO Fangli +1 位作者 SHU Qi YU Long 《Journal of Ocean University of China》 SCIE CAS 2016年第3期407-413,共7页
The Arctic sea ice minimum records appeared in the Septembers of 2007 and 2012, followed by high snow cover areas in the Northern Hemisphere winters. The snow cover distributions show different spatial patterns in the... The Arctic sea ice minimum records appeared in the Septembers of 2007 and 2012, followed by high snow cover areas in the Northern Hemisphere winters. The snow cover distributions show different spatial patterns in these two years: increased snow cover in Central Asia and Central North America in 2007, while increased snow cover in East Asia and northwestern Europe in 2012. The high snow cover anomaly shifted to higher latitudes in winter of 2012 compared to 2007. It is noticed that the snow cover had positive anomaly in 2007 and 2012 with the following conditions: the negative geopotential height and the related cyclonic wind anomaly were favorable for upwelling, and, with the above conditions, the low troposphere and surface air temperature anomaly and water vapor anomaly were favorable for the formation and maintenance of snowfalls. The negative geopotential height, cyclonic wind and low air temperature conditions were satisfied in different locations in 2007 and 2012, resulting in different spatial snow cover patterns. The cross section of lower air temperature move to higher latitudes in winter of 2012 compared to 2007. 展开更多
关键词 snow cover anomaly atmospheric circulation cyclonic wind anomaly low air temperature
下载PDF
Climatology of Guinea: Study of Climate Variability in N'zerekore
9
作者 Rene Tato Loua Maoro Beavogui +3 位作者 Hassan Bencherif Alpha Boubacar Barry Zoumana Bamba Christine Amory Mazodier 《Journal of Agricultural Science and Technology(A)》 2017年第4期215-233,共19页
N'zerekore is a geographical region of Guinea, which houses a weather observatory located at longitude 8.8°, latitude 7.7° and altitude 475 m. This region is of major socio-economic interest for the Country... N'zerekore is a geographical region of Guinea, which houses a weather observatory located at longitude 8.8°, latitude 7.7° and altitude 475 m. This region is of major socio-economic interest for the Country. The climatological study of this region shows the variability of each parameter. The objective of this study was to analyze meteorological parameters trends and to assess the space-time evolution of some agro-climatic risks related to the main trends observed in the meteorological parameters regime of this region. In this study, programming tools were used for processing and analyzing meteorological parameters data, including temperatures, rains, wind, evaporation and storms measured in this observatory from 1931 to 2014. The interannual, annual and daily variations of these parameters were obtained, as well as temperature, precipitation anomalies and agroclimatic indexes trends. The analyzing of these variations explained that September is the rainiest months, and the year 1932, 1957 and 1970 are normal, rainy and dry year, respectively. The evaporation increased since 1971 from January to March and November to December. A positive temperature anomaly was observed since 1973 with the maximum 26-33 ℃ and the minimum 16-21 ℃. A dominant westerly wind with a speed of 2.6 m/s was determined. Agro-climatic parameters in N'zerekore have high variability. From 1931 to 2014, three major periods can be distinguished: a wet period from 1931 to 1977, a dry period from 1978 to 1994 and rainfall variability from 1995 to 2014. The trend of these parameters explains the impact of climate change in this part of the world. This is exacerbated by human activity (deforestation), thus mitigation measures are necessary. It would be useful to extend this study throughout the country. 展开更多
关键词 Climate change N'zerekore agroclimatic index.
下载PDF
NUMERICAL SIMULATION OF SSTA IMPACTS OVER THE GLOBAL OCEAN ON THE ANOMALOUS CIRCULATION OVER EURASIA IN JANUARY 2008
10
作者 李琰 朱伟军 《Journal of Tropical Meteorology》 SCIE 2010年第3期238-246,共9页
In this paper, we discussed the features of atmospheric circulations over Eurasia as a response to sea surface temperature anomalies (SSTAs) over the tropical Indian Ocean, the equatorial Pacific, Kuroshio and the N... In this paper, we discussed the features of atmospheric circulations over Eurasia as a response to sea surface temperature anomalies (SSTAs) over the tropical Indian Ocean, the equatorial Pacific, Kuroshio and the North Atlantic. Our results are shown as follows: (1) CAM3.0, driven by the combined SSTAs over the four oceanic regions, can simulate well the features of anomalous atmospheric circulations over Eurasia in January 2008, indicating that the effects of the SSTAs over these four regions were one of the key causes of the anomalous systems over Eurasia. (2) The SSTAs over each key region contributed to the intensification of blocking over the Urals Mountains and a main East Asian trough. However, the influence of the SSTAs over individual oceanic regions differed from one another in other aspects. The SSTAs over the North Atlantic had an impact on the 500-hPa anomalous height (Z500A) over the middle-high latitudes and had a somewhat smaller effect over the low latitudes. For the warm SSTAs over Kuroshio, the subtropical high was much stronger, spread farther north than usual, and had an anomalous easterly that dominated the northwest Pacific Ocean. The warm SSTAs over the tropical Indian Ocean could have caused a negative Z500A from West Asia to Middle Asia, a remarkably anomalous southwesterly from the Indian Ocean to the south of China and an anomalous anticyclone circulation over the South China Sea-Philippine Sea region. Because of the La Nifia event, the winter monsoon was stronger than normal, with an anomalously cooler northerly over the southeastern coastal areas of China. (3) The combined effects of the SSTAs over the four key regions were likely more important to the atmospheric circulation anomalies of January 2008 over Eurasia than the effects of individual or partly combined SSTAS. This unique SSTA distribution possibly led to the circulation anomalies over Eurasia in January 2008, especially the atmospheric circulation anomalies over the subtropics, which were more similar to those of the winter E1 Nifio events than to the circulation anomalies following La Nifia. 展开更多
关键词 January 2008 snow disaster SSTAs atmospheric circulation anomalies CAM3.0 numerical simulation
下载PDF
Can the tropical storms originated from the Bay of Bengal impact the precipitation and soil moisture over the Tibetan Plateau? 被引量:6
11
作者 XIAO ZhiXiang DUAN AnMin 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第6期915-928,共14页
This study investigates the impacts of tropical storms originated from the Bay of Bengal(BOBTSs) on the precipitation and soil moisture over the Tibetan Plateau(TP) in April–June(AMJ) and September–December(SOND) du... This study investigates the impacts of tropical storms originated from the Bay of Bengal(BOBTSs) on the precipitation and soil moisture over the Tibetan Plateau(TP) in April–June(AMJ) and September–December(SOND) during 1981–2011 based on the best track dataset provided by Joint Typhoon Warning Centre(JTWC). Results indicate that there are about 1.35 BOBTSs influence the TP in each year and most of them occurred in May and October, and the BOBTSs in AMJ influence the TP with larger extension and higher latitudes than those in SOND. The maximum regional precipitation induced by the BOBTSs accounts for more than 50% for the total precipitation in the corresponding month and about 20% for the season. Further analysis reveals that the surface soil moisture anomalies induced by the BOBTSs can persist only 20–25 days in AMJ, and the case is also true for the snow depth in SOND. Numerical simulations by using the regional climate model of Weather Research and Forecasting(WRF) suggest that the soil moisture anomalies in the sub-surface can last 2 months whereas for the surface it can persist only about 20 days, which agrees well with the observation analysis. Overall, the effect of the preceding BOBTSs on the snow depth and soil moisture anomalies over the TP cannot maintain to summer, and there is no robust connection between the BOBTSs and summer precipitation anomalies in East China. Moreover, since the mid-1990 s, the spring rainfall induced by the BOBTSs over the TP seems to be enhanced to a certain degree because of the intensified BOBTSs. 展开更多
关键词 tropical storms Bay of Bengal the Tibetan Plateau soil moisture snow depth WRF
原文传递
Inter-decadal variations of springtime rainfall over southern China mainland for 1979-2004 and its relationship with Eurasian snow 被引量:5
12
作者 ZUO ZhiYan ZHANG RenHe WU BingYi 《Science China Earth Sciences》 SCIE EI CAS 2012年第2期271-278,共8页
This study analyzes the inter-decadal variations of rainfall over southern China in spring (March-April-May) using the observed precipitation data for 1979-2004. The result shows that the variations of spring rainfall... This study analyzes the inter-decadal variations of rainfall over southern China in spring (March-April-May) using the observed precipitation data for 1979-2004. The result shows that the variations of spring rainfall over southeastern China are opposite to those over and southwestern China in both inter-annual and inter-decadal time scales. The precipitation over south- ern China exhibits an apparent inter-decadal shift in the late 1980s. The accumulated spring rainfall has reduced 30% over southeastern China after the late 1980s, whereas it has increased twice as much over southwestern China. The atmospheric circulations related to this shift show that an abnormal high at lower and middle troposphere appears over Asian middle and high latitudes, accompanied by stronger-than-normal northerly wind over eastern China. Consequently, the wet air flows from tropical oceans are weakened over southern China, resulting in less rainfall over southeastern China and more rainfall over southwestern China. Furthermore, the anomalous atmospheric circulation over Asian middle and high latitudes is closely related to the inter-decadal downward shift of Eurasian spring snow in the late 1980s, indicating that the inter-decadal shift of Eurasian spring snow in the late 1980s is probably an important factor in the decadal shift of spring rainfall over southern China. 展开更多
关键词 spring rainfall over southern China inter-decadal variation inter-decadal shift Eurasian snow
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部