| 塔里木河流域干湿变化与大气环流关系 |
| |
| 引用本文： | 陶 辉,毛炜峄,黄金龙,翟建青.塔里木河流域干湿变化与大气环流关系[J].水科学进展,2014,25(1):45-52. |
| |
| 作者姓名： | 陶 辉 毛炜峄 黄金龙 翟建青 |
| |
| 作者单位： | 1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 江苏南京 210008; |
| |
| 基金项目： | 国家重点基础研究发展计划（973计划）资助项目（2010CB951001）；国家自然科学基金资助项目（41101023） |
| |
| 摘 要： | 基于塔里木河流域39个气象站1961—2010年逐日观测数据和NCEP/NCAR再分析数据，采用标准化降水蒸散指数（Standardized Precipitation Evapotranspiration Index，SPEI），分析了该流域近50年来干湿时空变化特征及典型干湿月份和突变前后的大气环流特征。对SPEI序列进行的趋势检验和突变分析表明，近50年来，塔里木河流域显著变湿并在1986年发生显著突变，SPEI上升趋势显著的站点较多的月份主要集中在暖季（5~10月）。对突变前后不同等级干湿事件频率变化的统计结果表明，突变后，极端干旱事件发生频率略有增加，但轻度和中度干旱事件发生频率有所减少，而不同等级的湿事件发生频率则一致地表现为增加。对典型干湿月份和突变前后对应的北半球500hPa位势高度场和风场变化的合成分析表明，暖季典型干湿月份环流系统配置存在明显差异，增加的水汽和弱不稳定大气层结构是该区域1986年后暖季变湿的原因之一。
|
| 关 键 词： | 塔里木河流域 标准化降水蒸散指数 干湿变化 大气环流 |
| 收稿时间： | 2012-04-27 |
Drought and wetness variability in the Tarim River basin and possible associations with large scale circulation |
| |
| TAO Hui,MAO Weiyi,HUANG Jinlong,ZHAI Jianqing.Drought and wetness variability in the Tarim River basin and possible associations with large scale circulation[J].Advances in Water Science,2014,25(1):45-52. |
| |
| Authors: | TAO Hui MAO Weiyi HUANG Jinlong ZHAI Jianqing |
| |
| Institution: | 1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2.Xinjiang Climate Center, Urumqi 830002, China;3.Nanjing University of Information Science & Technology, Nanjing 210044, China;4.National Climate Center, China Meteorological Administration, Beijing 100081, China |
| |
| Abstract: | Drought and wetness indices are important elements since they closely associated with water and energy balance over a geographical area and extending along a certain period of time. Studying of possible cause of drought and wetness variability is of great importance to understand the hydrological cycle and disaster reduction. Based on daily observations of 39 meteorological stations in the Tarim River basin, the spatial and temporal variability of drought and wetness has been analyzed using the standardized precipitation evapotranspiration index (SPEI). The result shows an increasing trend in annual mean SPEI with a significant change point in 1986. Although the frequency of moderate and severe drought decreased after 1986, the frequency of extreme drought events increased slightly. But different categories of wetness show a consistent increase in frequency. Furthermore, we also investigated the corresponding atmospheric circulation anomalies of drought and wetness changes over the Tarim River Basin using NCEP-NCAR reanalysis datasets. Composition analysis of geopotential height and wind field at 500 hPa are performed for typical extreme dry and wetness month as well as for the warm seasons (MJJASO)of the periods 1961 to 1986 and 1987 to 2010, the result shows obvious difference in large scale circulation pattern can be found in typical wet and dry months, the intensified water vapor transportation and unstable atmospheric stratification are the main reasons of the wetter condition in warm seasons after the 1980s. |
| |
| Keywords: | Tarim River basin standardized precipitation evapotranspiration index drought and wetness variation large scale circulation |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《水科学进展》浏览原始摘要信息 |
| 点击此处可从《水科学进展》下载免费的PDF全文 |
