| タイトル | SMAP Data Assimilation at the GMAO |
| 本文（外部サイト） | http://hdl.handle.net/2060/20160005050 |
| 著者（英） | De Lannoy, G.; Reichle, R.; Ardizzone, J.; Liu, Q. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2016-02-26 |
| 言語 | eng |
| 内容記述 | The NASA Soil Moisture Active Passive (SMAP) mission has been providing L-band (1.4 GHz) passive microwave brightness temperature (Tb) observations since April 2015. These observations are sensitive to surface(0-5 cm) soil moisture. Several of the key applications targeted by SMAP, however, require knowledge of deeper-layer, root zone (0-100 cm) soil moisture, which is not directly measured by SMAP. The NASA Global Modeling and Assimilation Office (GMAO) contributes to SMAP by providing Level 4 data, including the Level 4 Surface and Root Zone Soil Moisture(L4_SM) product, which is based on the assimilation of SMAP Tb observations in the ensemble-based NASA GEOS-5 land surface data assimilation system. The L4_SM product offers global data every three hours at 9 km resolution, thereby interpolating and extrapolating the coarser- scale (40 km) SMAP observations in time and in space (both horizontally and vertically). Since October 31, 2015, beta-version L4_SM data have been available to the public from the National Snow and Ice Data Center for the period March 31, 2015, to near present, with a mean latency of approx. 2.5 days. |
| NASA分類 | Geosciences (General) |
| レポートNO | GSFC-E-DAA-TN30433 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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