Daily high-resolution-blended analyses for sea surface temperature
Daily high-resolution-blended analyses for sea surface temperature
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DOI：
10.1175/2007jcli1824.1
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发表时间：
2007-11-15
影响因子：
4.9
通讯作者：
Schlax, Michael G.
中科院分区：
文献类型：
--
作者：
Reynolds, Richard W.;Smith, Thomas M.;Schlax, Michael G.
利用最优插值法（OI）开发了两种新的高分辨率海表温度（SST）分析产品。分析的空间网格分辨率为0.25度，时间分辨率为1天。一种产品使用高级甚高分辨率辐射计红外卫星SST数据。另一个使用高级甚高分辨率辐射计和高级微波扫描辐射计对美国航天局地球观测系统卫星SST数据的处理。这两种产品还使用船舶和浮标的现场数据，并包括对卫星相对于现场数据的偏差进行大规模调整。由于AMSR的几乎全天候覆盖，有一个增加的OI信号方差时，AMSR加入AVHRR。因此，当AMSR在2002年6月可用时，需要两个产品来避免分析方差跳变。这两种产品的结果表明，与以前每周一度的OI分析相比，空间和时间分辨率都有提高，仅AVHRR产品使用Pathfinder AVHRR数据（目前可获得1985年1月至2005年12月的数据）和2006年以后的业务AVHRR数据。在有条件的情况下，之所以选择“探路者”高级甚高分辨率辐射计而不是业务高级甚高分辨率辐射计，是因为“探路者”与现场数据比较吻合。AMSR AVHRR产品始于2002年6月AMSR数据的开始。在这个产品中，AVHRR的主要贡献是在陆地附近的地区，AMSR是不可用的。然而，在无云地区，使用红外和微波仪器可以减少系统偏差，因为它们的误差特性是独立的。
Two new high-resolution sea surface temperature (SST) analysis products have been developed using optimum interpolation (OI). The analyses have a spatial grid resolution of 0.25 degrees and a temporal resolution of 1 day. One product uses the Advanced Very High Resolution Radiometer (AVHRR) infrared satellite SST data. The other uses AVHRR and Advanced Microwave Scanning Radiometer (AMSR) on the NASA Earth Observing System satellite SST data. Both products also use in situ data from ships and buoys and include a large-scale adjustment of satellite biases with respect to the in situ data. Because of AMSR's near-all-weather coverage, there is an increase in OI signal variance when AMSR is added to AVHRR. Thus, two products are needed to avoid an analysis variance jump when AMSR became available in June 2002. For both products, the results show improved spatial and temporal resolution compared to previous weekly 1 degrees OI analyses.The AVHRR-only product uses Pathfinder AVHRR data (currently available from January 1985 to December 2005) and operational AVHRR data for 2006 onward. Pathfinder AVHRR was chosen over operational AVHRR, when available, because Pathfinder agrees better with the in situ data. The AMSR AVHRR product begins with the start of AMSR data in June 2002. In this product, the primary AVHRR contribution is in regions near land where AMSR is not available. However, in cloud-free regions, use of both infrared and microwave instruments can reduce systematic biases because their error characteristics are independent.