Validation and application of the monitoring method for degraded land-area-based on a dust erodibility in eastern Asia
Validation and application of the monitoring method for degraded land-area-based on a dust erodibility in eastern Asia
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基于沙尘侵蚀力的东亚退化土地面积监测方法验证与应用
DOI：
10.1080/01431161.2017.1325532
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发表时间：
2017
影响因子：
3.4
通讯作者：
Kimura Reiji
中科院分区：
文献类型：
--
作者：
後藤一稀，山本清仁，倉島栄一，金山素平，佐藤勇樹，鈴木健史，高橋範明;Kimura Reiji
干旱地区对气候变化和人类活动非常敏感，这是导致环境条件恶化的两个关键变化驱动因素。世界上的部分旱地位于东亚，包括中国和蒙古，这些地区荒漠化、干旱和亚洲沙尘事件（ADE）问题频繁发生。为了帮助防止这些问题造成经济损失，需要基于数值模型、遥感和天气预报的预警和监测系统。我将退化土地区域定义为“容易产生灰尘的区域”，并专门利用卫星数据来识别满足一定植被和干旱条件的土地。然后，我根据沙尘侵蚀力图和日本 ADE 的发生情况验证了这个定义，这与蒙古和中国部分地区沙尘区域的范围和严重程度密切相关，特别是在 3 月份（决定系数 R2 = 0.856）。退化土地面积的年际变化表明，中国呈明显下降趋势（R2=0.210），而蒙古则总体呈负趋势（R2=0.010）。中国和蒙古多年的严重干旱与退化土地面积的巨大正偏差非常吻合。
Arid regions are very sensitive to climate change and human activity, two critical drivers of change that are degrading environmental conditions. Part of the world’s drylands lie in eastern Asia, including China and Mongolia, where the problems of desertification, drought, and Asian dust events (ADEs) are frequent. To help prevent economic damage from these problems, an early warning and monitoring system based on numerical models, remote sensing, and weather forecasts is needed. I define a degraded land area as ‘the area where dust can easily occur’ and make exclusive use of satellite data to identify land that meets certain conditions of vegetation and aridity. I then validate this definition against a dust erodibility map and occurrences of ADEs over Japan, which was closely related to the extent and severity of dust areas in Mongolia and parts of China, especially in March (coefficient of determinationR2= 0.856). The yearly change of degraded land area indicates a clear decreasing trend in China (R2= 0.210), but an overall negative trend in Mongolia (R2= 0.010). Years of major droughts in China and Mongolia correspond well to large positive deviations in degraded land area.