Meteomatics global soil moisture index

Meteomatics calculate our soil moisture index by using data from ECMWF’s atmospheric model, which brings a number of benefits, including a high spatial resolution (10km), the frequency of data updates, with high temporal resolution; four model runs with hourly timesteps. Plus, the advanced soil type scheme derived from the root zone data (30-100 cm below the surface) of the FAO/UNESCO Digital Soil Map of the World, DSMW (FAO, 2003), which exists at a resolution of 5' X 5' (about 10 km). The SMI can be very helpful in several situations, such as estimating the drought risk, so an extensive history of soil moisture conditions in the upper soil layers is essential. Plus it can also be used in hydrological applications such as flooding and runoff forecasts, where a detailed knowledge of both upper and lower soil layers is indispensable. Meteomatics soil moisture index includes four discrete layers (-150cm / -50cm / -15cm / -5cm below ground level) based on the model data within ECMWF atmospheric model. The index is 0 if the permanent wilting point is reached and 1 at field capacity. Note that the index can exceed 1 after rainfall events. The soil moisture index is available for 4 depth levels.

搜集汇总

背景与挑战

背景概述

Meteomatics全球土壤湿度指数基于ECMWF大气模型数据，具备10公里空间分辨率和每小时更新的高时空分辨率。该指数采用FAO/UNESCO土壤类型方案，涵盖四个深度层，范围从0（永久萎蔫点）到1（田间持水量），可用于干旱风险评估及洪水径流预测等水文应用。