Soil moisture (assimilated data)

Leaf area index (LAI) is unitless measure of the total area of leaves per unit ground area (e.g., an LAI of 1 equates to 1 m2 of leaf area above 1 m2 of ground area), which can be a vital variable for predicting primary production of plants and evapotranspiration. The LAI data in SEEDS are calculated by the SURFEX land surface model. The seasonal changes in vegetation growth and senescence are simulated in a dynamic way by the model taking into account vegetation type, sunlight, and meteorological conditions that affect the growing season. The LAI is calculated over different vegetation types separately and are then spatially averaged to combine them into a single LAI for all natural surface types in the SURFEX model. https://www.seedsproject.eu/data/wg-assim叶面积指数（Leaf Area Index, LAI）是表征单位地面面积上总叶片面积的无量纲指标，例如叶面积指数为1即代表每1平方米地面上方对应1平方米的叶片面积。该指标是预测植物初级生产力与蒸散发的关键变量。SEEDS数据集所包含的LAI数据由SURFEX陆面模型计算得到。该模型通过综合考量植被类型、日照条件以及影响生长季的各类气象因素，以动态模拟方式复现植被生长与衰老的季节变化过程。模型会先分别针对不同植被类型计算LAI，随后进行空间平均，将所有自然地表类型整合为统一的LAI值。数据集来源：https://www.seedsproject.eu/data/wg-assim