ASCAT Surface Soil Moisture Climate Data Record v7 12.5 km sampling - Metop

The soil moisture product is derived from the Advanced Scatterometer (ASCAT) backscatter observations and provided on a fixed Earth grid (12.5 km sampling) in time series format. The soil moisture product contains an estimate of the water content of the 0-5 cm topsoil layer, expressed in degree of saturation (0 to 100%). The algorithm used to derive saturation is based on a linear relationship of soil moisture and backscatter applying a change detection technique eliminating the contributions of vegetation, land cover and surface topography, considered invariant from year to year. Seasonal vegetation effects are modelled by exploiting the multi-angle viewing capabilities of ASCAT. The soil moisture algorithm has been developed by Technische Universität Wien (TU Wien), part of the EUMETSAT Satellite Application Facility on Support to Operational Hydrology and Water Management (H SAF) consortium. The soil moisture product represents a Climate Data Record (CDR) which is continuously extended every 2-4 months in a separate offline product called ASCAT Surface Soil Moisture Climate Data Record v7 Extension 12.5 km sampling - Metop (H120).

本土壤湿度产品源自高级散射计（Advanced Scatterometer, ASCAT）的后向散射观测数据，以固定地球网格（采样分辨率12.5 km）的时间序列格式提供。本产品包含0-5厘米表层土壤的含水量估算值，以饱和度（0至100%）的形式表征。用于推导饱和度的算法基于土壤湿度与后向散射的线性关系，采用变化检测技术剔除植被、土地覆被与地表地形的影响——上述因素被认为年际间保持恒定。研究团队借助ASCAT的多角度观测能力，对季节性植被效应进行建模修正。本土壤湿度算法由维也纳工业大学（Technische Universität Wien, TU Wien）开发，该机构隶属于欧洲气象卫星应用组织（EUMETSAT）业务水文与水管理支持卫星应用设施（H SAF）联盟。本土壤湿度产品属于气候数据记录（Climate Data Record, CDR），每2至4个月会通过一款独立的离线产品进行持续扩展更新，该离线产品命名为「ASCAT地表土壤湿度气候数据记录v7扩展版（采样间距12.5 km）- Metop (H120)」。

搜集汇总

背景与挑战

背景概述

ASCAT表层土壤水分气候数据记录v7版(12.5公里采样)是由维也纳理工大学开发的科学产品，提供0-5厘米表层土壤水分饱和度数据，采用独特的变化检测算法消除环境干扰因素，形成持续更新的气候数据记录。