Effects of precipitation-bias corrections on surface hydrology over northern latitudes

被引:48
作者
Tian, Xiangjun [1 ]
Dai, Aiguo
Yang, Daqing
Xie, Zhenghui
机构
[1] Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China
[2] Natl Ctr Atmospher Res, Boulder, CO 80307 USA
[3] Univ Alaska, Water & Environm Res Ctr, Fairbanks, AK 99701 USA
关键词
D O I
10.1029/2007JD008420
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Under-catch errors in precipitation gauge records can be as large as 50-100% during the cold season at high latitudes. To quantify the impacts of these errors on hydrometeorological fields, a comprehensive land surface model, namely the Community Land Model version 3 (CLM3), is run forced with (COF) and without (CON) precipitation-bias corrections and other identical atmospheric forcing from 1973 to 2004. It is found that the enhanced snowfall induced by the bias corrections increases snow accumulation on the ground (by 6-18 cm for December to February), which in turn increases May to July runoff by 0.4-0.6 mm day-1 and streamflow by 5-25% for most major rivers in the northern latitudes (north of 45 degrees N). The precipitation-bias corrections also improve the model-simulated mean annual cycle and temporal variations of streamflow for the major northern rivers during 1973-2004. As a result, the simulation of the freshwater discharge into the Arctic Ocean is also improved. Only small and statistically insignificant changes are found in soil moisture content, surface evaporation, and sensible heat flux between the CON and COF runs. Nevertheless, the results still suggest that it is important to use bias-corrected precipitation in terrestrial water balance analyses and land surface modeling.
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页数:10
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