2002-2018年全球AMSR-E/2近地表冻融状态产品数据集(0.25°)

近地表土壤的冻结/融化状态表征着陆地表层过程的休眠和活跃，这种冻融相态交替能引起一系列复杂的地表过程轨迹模式突变，影响着土壤的水热特性、地表径流和地下水补给等水循环过程，同时也通过水和能量循环机制影响气候变化。本数据集是基于AMSR-E和AMSR2被动微波亮温数据，利用冻融判别式算法制备的全球近地表冻融状态（空间分辨率：0.25°；时间跨度：2002-2019年），可用于分析全球近地表冻融循环的开始/结束日期、冻结/融化时长、冻结范围等指标的空间分布和趋势变化，可为理解全球变化背景下陆表冻融循环与水分、能量交换过程的相互作用机制提供数据支持。

The freezing/thawing state of near-surface soil reflects the dormant and active phases of land surface processes. The alternation of freezing and thawing phases triggers a series of abrupt changes in the trajectory patterns of complex surface processes, affecting hydrological cycles including soil hydrothermal properties, surface runoff and groundwater recharge, while also influencing climate change via water and energy cycle mechanisms.
This dataset is developed based on passive microwave brightness temperature data from AMSR-E and AMSR2, using a freezing-thawing discriminant algorithm to produce global near-surface freezing/thawing state products (spatial resolution: 0.25°; temporal span: 2002–2019). It can be used to analyze the spatial distribution and trend changes of indicators such as the start/end dates of global near-surface freeze-thaw cycles, freezing/thawing duration and frozen area, providing data support for understanding the interaction mechanisms between land surface freeze-thaw cycles and water and energy exchange processes under the context of global change.

搜集汇总

背景与挑战

背景概述

该数据集是基于AMSR-E和AMSR2被动微波亮温数据，利用冻融判别式算法制备的全球近地表冻融状态产品，时间跨度为2002-2019年，空间分辨率为0.25°。它提供了逐日的全球覆盖数据，用于分析冻融循环的开始/结束日期、时长和范围等指标，支持研究陆表冻融过程与水分、能量交换的相互作用机制。数据集具有高时空分辨率，适用于气候变化和水循环相关研究。