NLDAS Noah Land Surface Model L4 Hourly 0.125 x 0.125 degree V2.0 (NLDAS_NOAH0125_H) at GES DISC

This data set contains fifty-three fields simulated from the Noah land-surface model (LSM) for Phase 2 of the North American Land Data Assimilation System (NLDAS-2). The data are in 1/8th degree grid spacing and range from Jan 1979 to the present. The temporal resolution is hourly. The file format is netCDF (converted from the GRIB format).

The Noah model was developed as the land component of the NOAA NCEP mesoscale Eta model [Betts et al. (1997); Chen et al. (1997); Ek et al. (2003)]. As used in NLDAS-2, recent modifications were made to Noah's cold-season [Livneh et al. (2010)] and warm-season [Wei et al. (2012)] parameterizations. Noah serves as the land component in the evolving Weather Research and Forecasting (WRF) regional atmospheric model, the NOAA NCEP coupled Climate Forecast System (CFS), and the Global Forecast System (GFS). The model simulates the soil freeze-thaw process and its impact on soil heating/cooling and transpiration, following Koren et al. (1999). The model has four soil layers with spatially invariant thicknesses of 10, 30, 60, and 100 cm. The first three layers form the root zone in non-forested regions, with the fourth layer included in forested regions.

Details about the NLDAS-2 configuration of the Noah LSM can be found in Xia et al. (2012).

本数据集包含由诺亚地表模型（LSM）模拟的五十三个字段，该模型为北美陆地数据同化系统第二阶段（NLDAS-2）的土地组件。数据以1/8度网格间距呈现，时间跨度从1979年1月至当前。时间分辨率为每小时。文件格式为netCDF（由GRIB格式转换而来）。诺亚模型作为美国国家海洋和大气管理局（NOAA）国家环境预测中心（NCEP）中尺度Eta模型的陆地组件被开发出来[贝茨等（1997年）；陈等（1997年）；埃克等（2003年）]。在NLDAS-2中应用时，对诺亚模型的冷季[利文海等（2010年）]和暖季[魏等（2012年）]参数化进行了近期修改。诺亚模型作为正在发展的天气研究预报（WRF）区域大气模型、NOAA NCEP耦合气候预报系统（CFS）以及全球预报系统（GFS）的陆地组件。该模型模拟土壤冻结-解冻过程及其对土壤加热/冷却和蒸腾作用的影响，遵循科尔恩等（1999年）的研究。模型具有四个土壤层，其空间厚度分别为10、30、60和100厘米。前三个层构成非森林区域的根系区，第四层包含在森林区域的土壤中。有关诺亚LSM在NLDAS-2中的配置详情，可参考夏等（2012年）的研究。