An ensemble of 48 physically perturbed model estimates of the 1/8° terrestrial water budget over the conterminous United States, 1980–2015

This dataset contains the 1980–2015 monthly terrestrial water budget simulated by a 48-member perturbed-physics ensemble configured from the Noah LSM with multi-physics options (Noah‑MP v3.6). Simulation outputs include total evapotranspiration and its constituents (canopy evaporation, soil evaporation, and transpiration), runoff (the surface and subsurface components), as well as terrestrial water storage (snow water equivalent, four-layer soil water content from the surface down to 2 m, and the groundwater storage anomaly). The file name has four parts: the abbreviation for "terrestrial water budget", the used parameterization, the time scale, and the suffix.

The 48 physics configurations are generated by combining four runoff parameterizations (run1: SIMGM, run2: SIMTOP, run3: NOAHR, run4: BATS), two parameterizations of stomatal conductance (can1: Ball–Berry, can2: Jarvis), three parameterizations of soil moisture stress factor (btr1:NOAHB, btr2: CLM, btr3: SSiB), and two parameterizations of near-surface atmospheric turbulence (tub1: M-O, tub2: Chen97).

The simulation domain covers the all of conterminous United States (25°–53°N, 125°–67°W), which is also called the NLDAS-2 testbed (Xia et al., 2012a, b). The simulations were performed at a spatial resolution of 0.125°, which is the same as for NLDAS-2 models. Details of the simulation settings and spin-up run can be found in Section 2.3 of Zheng et al. (2019) and Section 2.2 of Fei et al. (2021).

本数据集包含基于搭载多物理选项的Noah陆面模式（Noah‑MP v3.6）构建的48成员扰动物理集合模拟得到的1980–2015年月尺度陆地水平衡数据。模拟输出涵盖总蒸散发及其组分（冠层蒸发、土壤蒸发与植被蒸腾）、径流（地表与地下径流分量），以及陆地水储量相关参数（雪水当量、自地表向下至2米的四层土壤含水量，以及地下水储量距平）。文件名由四部分组成：陆地水平衡的缩写标识、所用参数化方案、时间尺度，以及文件后缀。

48种物理配置方案由以下四类参数化方案组合生成：4种径流参数化方案（run1: SIMGM，run2: SIMTOP，run3: NOAHR，run4: BATS）、2种气孔导度参数化方案（can1: Ball–Berry，can2: Jarvis）、3种土壤水分胁迫因子参数化方案（btr1:NOAHB，btr2: CLM，btr3: SSiB），以及2种近地表大气湍流参数化方案（tub1: M-O，tub2: Chen97）。

模拟区域覆盖美国本土全域（北纬25°–53°，西经125°–67°），该区域亦被称为NLDAS-2试验平台（Xia等，2012a、b）。模拟采用与NLDAS-2模式一致的0.125°空间分辨率。有关模拟设置与自旋启动过程的详细信息，可参阅Zheng等（2019）的第2.3节以及Fei等（2021）的第2.2节。