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DOI | 10.2151/jmsj.85A.229 |
Auto-calibration system developed to assimilate AMSR-E data into a land surface model for estimating soil moisture and the surface energy budget | |
Yang, Kun; Watanabe, Takahiro; Koike, Toshio; Li, Xin; Fuji, Hideyuki; Tamagawa, Katsunori; Ma, Yaoming; Ishikawa, Hirohiko | |
发表日期 | 2007 |
ISSN | 0026-1165 |
EISSN | 2186-9057 |
起始页码 | 229 |
结束页码 | 242 |
卷号 | 85A |
英文摘要 | Low-frequency microwave brightness temperature is strongly affected by near-surface soil moisture; therefore, it can be assimilated into a land surface model to improve modeling of soil moisture and the surface energy budget. This study presents a new variational land system used to assimilate AMSR-E brightness temperature of vertical polarization of 6.9 GHz and 18.7 GHz. The system consists of a land surface model (LSM) used to calculate surface fluxes and soil moisture, a radiative transfer model (RTM) to estimate the microwave brightness temperature, and an optimization scheme to search for optimal values of soil moisture by minimizing the difference between modeled and observed brightness temperature. The LSM is an improved simple biosphere model for sparse vegetation modeling and the RTM is a Q-h model that can account for the effects of surface roughness and vegetation. Several parameters in the LSM and RTM can significantly affect the outputs of the land data assimilation system but their values are either highly variable or unavailable. To solve this problem, we developed a dual-pass assimilation technique. Pass 1 inversely estimates the optimal values of the model parameters with long-term (similar to months) forcing data and brightness temperature data, while Pass 2 estimates the near-surface soil moisture in a daily assimilation cycle. This system is driven by well-established reanalysis data and global data sets of leaf area index, precipitation, and surface radiation, and was tested at a CEOP (Coordinate Enhanced Observing Period) reference site on the Tibetan Plateau. The system not only detected the effect of precipitation events that were missing in the forcing data, but also led to a significant improvement in modeling of the surface energy budget. |
关键词 | SOUTHERN GREAT-PLAINSREMOTE-SENSING DATAHETEROGENEOUS LANDSCAPEPARAMETERIZATION SIB2ATMOSPHERIC GCMSSATELLITE DATAMICROWAVE DATAVEGETATIONALGORITHMSCALE |
语种 | 英语 |
WOS研究方向 | Meteorology & Atmospheric Sciences |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS记录号 | WOS:000246144200012 |
来源期刊 | JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN
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来源机构 | 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/257503 |
推荐引用方式 GB/T 7714 | Yang, Kun,Watanabe, Takahiro,Koike, Toshio,et al. Auto-calibration system developed to assimilate AMSR-E data into a land surface model for estimating soil moisture and the surface energy budget[J]. 中国科学院青藏高原研究所,2007,85A. |
APA | Yang, Kun.,Watanabe, Takahiro.,Koike, Toshio.,Li, Xin.,Fuji, Hideyuki.,...&Ishikawa, Hirohiko.(2007).Auto-calibration system developed to assimilate AMSR-E data into a land surface model for estimating soil moisture and the surface energy budget.JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN,85A. |
MLA | Yang, Kun,et al."Auto-calibration system developed to assimilate AMSR-E data into a land surface model for estimating soil moisture and the surface energy budget".JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 85A(2007). |
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