| 金沙江流域实际蒸散发遥感重建及时空特征分析 |
| |
| 引用本文： | 张珂,鞠艳,李致家.金沙江流域实际蒸散发遥感重建及时空特征分析[J].水科学进展,2021,32(2):182-191. |
| |
| 作者姓名： | 张珂 鞠艳 李致家 |
| |
| 作者单位： | 1.河海大学水文水资源与水利工程科学国家重点实验室, 江苏 南京 210098 |
| |
| 基金项目： | 国家重点研发计划资助项目（2016YFC0402701）；江苏省杰出青年基金资助项目（BK20180022） |
| |
| 摘 要： | 通过构建基于重力卫星的实际蒸散发重建方法来获取高精度的实际蒸散发信息，为研究气候变化下的水循环规律提供关键信息。利用GLDAS陆面模式同化数据对GRACE重力卫星水储量观测数据进行空间降尺度，通过水量平衡法，重建了金沙江流域2002-2016年的子流域尺度实际蒸散发月序列。结果表明:①基于重力卫星观测与水量平衡方法重建的实际蒸散发（ETRecon）与ETPLSH、ETJung和ETMODIS3种遥感反演产品相比有较高的可靠性，其中与ETPLSH的相关性最高（r=0.82），与ETJung的平均差和均方根差最小。②研究区年均实际蒸散发为410.8 mm/a，空间分布上由西北向东南递增，年际变化上呈增加趋势。③季节尺度上，实际蒸散发夏季最高，呈逐年增加趋势；冬季最低，波动较平稳。
|
| 关 键 词： | 实际蒸散发 GRACE卫星 水量平衡 时空分布 金沙江流域 |
| 收稿时间： | 2020-03-16 |
Satellite-based reconstruction and spatiotemporal variability analysis of actual evapotranspiration in the Jinshajiang River basin,China |
| |
| ZHANG Ke,JU Yan,LI Zhijia.Satellite-based reconstruction and spatiotemporal variability analysis of actual evapotranspiration in the Jinshajiang River basin,China[J].Advances in Water Science,2021,32(2):182-191. |
| |
| Authors: | ZHANG Ke JU Yan LI Zhijia |
| |
| Institution: | 1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China2.College of hydrology and Water Recourses, Hohai University, Nanjing 210098, China |
| |
| Abstract: | To obtain a high-quality record of actual evapotranspiration (ETA) with which to investigate water cycle changes in the context of climate change,this study developed a method for reconstruction of ETA based on gravity satellite observations. The proposed method used GLDAS assimilated land surface water storage data to downscale GRACE equivalent water thickness to finer spatial resolution. Then,subbasin-level monthly ETA data for the Jinshajiang River basin were reconstructed based on the water balance during 2002—2016. Results showed that:① The reconstructed ETA data (ETRecon) had high quality and compared well with three satellite-retrieval products,i.e.,ETPLSH,ETJung,and ETMODIS;the strongest correlation was with the ETPLSH product (r=0.82) and the lowest root mean squared difference was with the ETJung data. ② Multiyear mean ETA in the study area was 410.8 mm/a with a gradient of increase from northwest to southeast. Temporally,it showed a significant upward trend during 2002—2016. ③ Seasonally,summer ETA was highest and it showed an upward trend over the study period;conversely,ETA in winter had the lowest value and it showed trivial change temporally. |
| |
| Keywords: | actual evapotranspiration GRACE satellite water balance spatiotemporal distributions Jinshajiang River basin |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《水科学进展》浏览原始摘要信息 |
| 点击此处可从《水科学进展》下载免费的PDF全文 |
