摘要
利用NCEP/NCAR 1 980 -1 989年 1 0年逐日 0 0UTC、 1 2UTC再分析资料及青藏高原降水、径流资料 ,研究了青藏高原雅鲁藏布江流域的水平衡特征 ,估算了雅鲁藏布江流域的蒸发、土壤和地下水含量。结果表明 :雅鲁藏布江流域夏季是水汽辐合区 ,降水大于蒸发 ;秋末到次年春季是水汽通量辐散区 ,蒸发大于降水。降水主要集中在 6~ 9月。径流的年际变化趋势同降水相近 ,径流主要是由降水补给的 ,径流峰值滞后降水峰值一个月。雅鲁藏布江流域土壤及地下含水量从 1~ 6月逐渐减少 ,7月以后开始增加 ,1 0月是土壤及地下水最丰富的时段。 2 0世纪 80年代中期和后期降水、蒸发、径流等呈增长趋势 ,这同ENSO事件有关。
The characteristics of water balance over Yalu Tsangpo River basin in Tibet are researched by using NCEP/NCAR twice daily (0000 and 1200UTC) reanalysis data, monthly runoff and precipitation for the period of 1980 - 1989, and the evaporation, soil and surface water storage are also estimated. The main results are as follows: (1) the Yalu Tsangpo River basin acts as a moisture sink from May through October, where precipitation exceeds evaporation, and as a moisture source during November-April, where evaporation exceeds precipitation; (2) in Yalu Tsangpo River basin, precipitation mainly occurs during summer, and runoff, whose peak value lags that of precipitation one month, cheifly supplied by precipitation; (3) the soil and subsurface water storage decreases from January to June, but increases after July and reaches its maximum in October; and (4) over Yalu Tsangpo River basin there are raising trends in precipitation, evaporation, and runoff in late 1980s, which are related to ENSO events.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2001年第4期509-515,共7页
Advances in Water Science
基金
国家自然科学基金项目 ( 4 990 5 0 0 4 )资助~~