Real-time and retrospective forcing in the North American Land Data Assimilation System (NLDAS) project
Real-time and retrospective forcing in the North American Land Data Assimilation System (NLDAS) project
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DOI：
10.1029/2002jd003118
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发表时间：
2003-10-31
影响因子：
4.4
通讯作者：
Meng, J
中科院分区：
文献类型：
--
作者：
Cosgrove, BA;Lohmann, D;Meng, J
[1]强迫数据的准确性极大地影响了陆面模式(LSM)模拟陆面过程的能力。考虑到这一点，多机构北美土地数据同化系统(NLDAS)项目制作了追溯(1996-2002年)和实时(1999年至今)数据集，以支持其LSM模拟活动。每个数据集具有0.125度空间分辨率、每小时时间分辨率、9个主迫力场和6个次级验证/模式发展场，以埃塔数据同化系统/埃塔数据为基础，并辅之以基于观测的降水和辐射数据。基于小时观测的降水数据来自国家环境预测气候预测中心(CPC)每日基于量规的降水分析和基于国家气象局多普勒雷达(WSR-88D)的小时降水分析的组合，其中基于小时雷达的分析用于在时间上分解每日CPC分析。基于NLDAS观测的短波值是从马里兰大学和国家环境卫星数据和信息局处理的地球静止业务环境卫星辐射数据得出的。对NLDAS强迫数据集进行了广泛的质量控制和验证工作，并与俄克拉荷马州中间网、大气辐射测量计划/云和辐射试验台以及地面辐射观测数据进行了有利的比较。实时强迫数据集正在不断演变，以利用强迫相关数据集的最新进展，所有实时和追溯数据均可在网上查阅http：//ldas。GSFC。美国宇航局。GOV，提供完整和子集形式的可视化和下载。
[1] The accuracy of forcing data greatly impacts the ability of land surface models (LSMs) to produce realistic simulations of land surface processes. With this in mind, the multi-institutional North American Land Data Assimilation System (NLDAS) project has produced retrospective ( 1996 - 2002) and real- time ( 1999 - present) data sets to support its LSM modeling activities. Featuring 0.125degrees spatial resolution, hourly temporal resolution, nine primary forcing fields, and six secondary validation/model development fields, each data set is based on a backbone of Eta Data Assimilation System/Eta data and is supplemented with observation-based precipitation and radiation data. Hourly observation-based precipitation data are derived from a combination of daily National Center for Environmental Prediction Climate Prediction Center (CPC) gauge-based precipitation analyses and hourly National Weather Service Doppler radar-based (WSR-88D) precipitation analyses, wherein the hourly radar-based analyses are used to temporally disaggregate the daily CPC analyses. NLDAS observation-based shortwave values are derived from Geostationary Operational Environmental Satellite radiation data processed at the University of Maryland and at the National Environmental Satellite Data and Information Service. Extensive quality control and validation efforts have been conducted on the NLDAS forcing data sets, and favorable comparisons have taken place with Oklahoma Mesonet, Atmospheric Radiation Measurement Program/cloud and radiation test bed, and Surface Radiation observation data. The real- time forcing data set is constantly evolving to make use of the latest advances in forcing- related data sets, and all of the real- time and retrospective data are available online at http:// ldas. gsfc. nasa. gov for visualization and downloading in both full and subset forms.