Characteristics of Central Southwest Asian Water Budgets and Their Impacts on Regional Climate
Characteristics of Central Southwest Asian Water Budgets and Their Impacts on Regional Climate作者机构：Climate Research Division Environment Canada Gatineau Canada National Agromet Center Pakistan Meteorological Department Islamabad Pakistan National Drought Monitoring Center Pakistan Meteorological Department Islamabad Pakistan York University Toronto Canada
出 版 物：《Atmospheric and Climate Sciences》 (大气和气候科学（英文）)
年 卷 期：2013年第3卷第2期
页 面：259-268页
学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学]
主 题：Water Budgets Drought over Central Southwest Asia Moisture Flux Convergence Principle Component Analysis Climate Change
摘 要：Water budgets terms, evapotranspiration (E), precipitation (P), runoff (N), moisture convergence (MC) and both surface as well as atmospheric residual terms have been computed with National Centers for Environmental Prediction (NCEP) (1948-2007) and European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-40 (1958-2001) reanalysis data sets for Central Southwest Asia (CSWA).The domain of the study is 45° - 75°E & 25° - 40°N. Only the land area has been used in these calculations. It is noted in the comparison of both reanalysis data sets with Global Precipitation Climatology Centre (GPCC) that all three data sets record different precipitation before 1970. The maximum is from NCEP and the minimum with ERA-40. However, after 1970 all the data sets record almost the same precipitation. ERA-40 computes two phases of MC. Before 1975, the domain acts as a moisture source, whereas after 1975 it behaves as a moisture sink. The region CSWA is divided into six sub areas with rotational principle factor analysis and we distinguish them by different approached weather systems acting on each area. Finally, NCEP yearly precipitation is further divided into seasons;winter (November to April) and summer (May to October) and two phases have been noted. The variation in winter precipitation is more than summer during last 60-year analysis.
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