Use of a land surface model to evaluate the observed soil moisture of grassland at the Tongyu reference site |
| |
Authors: | Li Dan Jinjun Ji Huizhi Liu |
| |
Institution: | [1]Regional Center for Temperate East Asia and Key Laboratory of Regional Climate-Environmentfor Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]State Key Laboratory of Atraospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
| |
Abstract: | A land surface model driven by the continuous three-year observed meteorological data with
a time interval of 30 minutes at the Tongyu station, a reference site of the Coordinated Enhanced
Observing Period (CEOP), was used to evaluate the observation bias of soil moisture (SM) data and
analyze the variation of SM at different time scales. The saline-alkaline soil of the grassland at
the Tongyu site makes the measured SM too high, especially in boreal summer of 2003--05. The simulated
annual mean SM has the lowest value in 2004 and its three-year variation corresponds to the change
of precipitation, whereas the observation shows the increasing trend from 2003 to 2005. Compared to
the variation range between -60% and 40% for the anomaly percentage of the simulated daily mean
SM during May--October of 2004, the measured data show the higher values more than 40%. The magnitude
of the variation trend of the observed daily mean SM in 2003 and 2005 is generally consistent with the
simulation. The largest deficiency for the soil moisture observation of the grassland is the overestimated
value in the drought year with less precipitation. The simulated monthly mean SM has the lowest value
in March due to the large contribution of evaporation relative to precipitation and this phenomenon
can not be reproduced in the observation. |
| |
Keywords: | soil moisture variation trend Tongyu reference site AVIM data evaluation |
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 |
|