| Impacts of Systematic Precipitation Bias on Simulations of Water and Energy Balances in Northwest America |
| |
| 作者姓名： | 徐国强 |
| |
| 作者单位： | State Key |
| |
| 基金项目： | NOAA Grant NA17RJ2612，国家重点基础研究发展计划(973计划)，国家自然科学基金 |
| |
| 摘 要： | At high latitudes and in mountainous areas, evaluation and validation of water and energy flux simu-lations are greatly affected by systematic precipitation errors. These errors mainly come from topographic effects and undercatch of precipitation gauges. In this study, the Land Dynamics （LAD） land surface model is used to investigate impacts of systematic precipitation bias from topography and wind-blowing on water and energy flux simulation in Northwest America. The results show that topographic and wind adjustment reduced bias of streamflow simulations when compared with observed streamflow at 14 basins. These systematic biases resulted in a -50%-100% bias for runoff simulations, a -20%-20% bias for evapotranspiration, and a -40%-40% bias for sensible heat flux, subject to different locations and adjustments, when compared with the control run. Uncertain gauge adjustment leads to a 25% uncertainty for precipitation, a 20% 100% uncertainty for runoff simulation, a less-than-10% uncertainty for evapotranspiration, and a less-than-20% uncertainty for sensible heat flux.
|
| 关 键 词： | 美国西北部 水平衡 能量平衡 陆地动态模型 |
| 收稿时间： | 12 June 2006 |
| 修稿时间： | 2006-06-12 |
Impacts of systematic precipitation bias on simulations of water and energy balances in Northwest America |
| |
| Youlong?Xia,Xu?Guoqiang.Impacts of Systematic Precipitation Bias on Simulations of Water and Energy Balances in Northwest America[J].Advances in Atmospheric Sciences,2007,24(5):739-749. |
| |
| Authors: | Youlong Xia Xu Guoqiang |
| |
| Institution: | Atmospheric and Oceanic Science Program and NOAA Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, New Jersey, USA,State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081 |
| |
| Abstract: | At high latitudes and in mountainous areas, evaluation and validation of water and energy flux simulations are greatly affected by systematic precipitation errors. These errors mainly come from topographic effects and undercatch of precipitation gauges. In this study, the Land Dynamics (LaD) land surface model is used to investigate impacts of systematic precipitation bias from topography and wind-blowing on water and energy flux simulation in Northwest America. The results show that topographic and wind adjustment reduced bias of streamflow simulations when compared with observed streamflow at 14 basins. These systematic biases resulted in a -50%-100% bias for runoff simulations, a -20%-20% bias for evapotranspiration,and a -40%-40% bias for sensible heat flux, subject to different locations and adjustments, when compared with the control run. Uncertain gauge adjustment leads to a 25% uncertainty for precipitation, a 20%-100% uncertainty for runoff simulation, a less-than-10% uncertainty for evapotranspiration, and a less-than-20% uncertainty for sensible heat flux. |
| |
| Keywords: | LaD model bias adjustment water and energy balance Northwest America |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《大气科学进展》浏览原始摘要信息 |
| 点击此处可从《大气科学进展》下载免费的PDF全文 |
|
