A Comparative Analysis of Primary and Extreme Characteristics of Dry or Wet Status between Asia and

来源 :大气科学进展(英文版) | 被引量 : 0次 | 上传用户:lixiang1336
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
In this study, the Palmer Drought Severity Index (PDSI) was used to analyze the average and extreme dry/wet states of Asia and North America from 1953 to 2003. The results indicate that the two continents underwent drying trends during this period. Compared with North America, Asia showed more severe drought trends. However, more significant and regular seasonal variation for drought was found in North America. The driest regions in Asia were located in the northern region of China, Mongolia, and eastern mid-Siberian plateau. Most regions in central North America were relatively wetter than other regions. The northern and southwestern regions of North America, as well as the Atlantic and Pacific coastal areas, experienced the most drought during this period. A sharp increase of the drought area and the number of extreme drought events took place from 1997 to 2003 in both Asia and North America. Severe drought events were more likely to occur during the summer on both continents. Asia had the most extreme drought events during July, but North America reached its highest drought frequency from June to September. In Asia, a persistent increasing trend of extreme drought emerged throughout the studied period. However, a more complex evolution of drought emerged in North America: a decreasing trend appeared before the mid-1960s and an increasing trend appeared after the late 1970s. A relatively steady dry/wet status was observed between the mid-1960s and the late 1970s. The role of exceptional, extreme drought events with respect to the La Nina event was considered during 1997-2003.
其他文献
欠发达地区公路文化建设在长期的探索与实践中取得了一定的成效,但同时也存在许多问题。当前,发展欠发达地区公路文化,要树立文化兴路的战略,革新文化观念,加大公路文化建设
文章分析了公路路基施工之前的质量监理工作要点,并探讨了土方、石方和土石方这三种性质的路堤的施工质量监理方法,然后介绍了高填方路基和桥涵等构筑物台背填筑的质量控制要
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
Daily maximum/minimum temperatures and relative humidity records from 510 stations in China for the period 1960-2008 were used to investigate geographical patte
Trends in the frequencies of four temperature extremes (the occurrence of warm days, cold days, warm nights and cold nights) with respect to a modulated annual
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
The formation potential of four trihalomethanes (THMFP) and seven haloacetic acids (HAA7FP) in 13 source waters taken from four major water basin areas in China
据新华社电5月8日:重庆市工商局在公安机关和高速公路执法总队支持配合下,在包茂高速巴南收费站对贩运活鸡鸭来渝的经营户进行检查,查获一起活鸡销售中添加矿物质案,查获涉嫌
The tropical Indian Ocean (TIO) is warmer than normal during the summer when or after the El Nino decays. The present study investigates the impact of TIO SST o
The most important climatological feature of the South Asian region is the occur-rence of monsoons. With increasing concerns about climate change, the need to u