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黄河源高时间分辨率土壤湿度产品制作研究


项目来源

国家自然科学基金(面上)

负责人

文军

开始日期

2012.1

结束日期

2015.12

经费

86

摘要

土壤湿度是水文学和气象气候学中的一个重要参量。目前,利用卫星微波遥感获取较大范围表层土壤湿度的技术已日趋成熟,但这些数据时间分辨率较低,不能满足陆面过程研究和实际生产的需要。本项目拟采用前期降水估算土壤湿度模型,利用卫星微波遥感土壤湿度和卫星红外遥感降水产品,制作黄河源区具有较高估算精度、一定空间分辨率和较高时间分辨率的土壤湿度产品。首先,在黄河源区玛曲土壤温度湿度观测网络中增加降水观测,收集时空尺度上的土壤湿度和降水观测资料,并依此建立前期降水估算土壤湿度模型;进一步利用气象卫星遥感降水产品和前期降水估算土壤湿度模型,同化卫星微波遥感资料反演的土壤湿度,制作高时间分辨率的土壤湿度产品;最后,利用玛曲土壤温度湿度观测网络资料对估算的高时间分辨率土壤湿度产品进行验证。本项目研究结果可为黄河源区水资源和生态环境系统演变等研究提供数据支持,并拓展国产气象卫星产品的应用领域。

英文摘要

Soil moisture is an important parameter in hydrology and meteorology. At present, the technology of obtaining surface soil moisture in a large range by satellite microwave remote sensing is increasingly mature, but the temporal resolution of these data is low, which cannot meet the needs of land surface process research and actual production. This project intends to use early precipitation to estimate soil moisture model, and use satellite microwave remote sensing soil moisture and satellite infrared remote sensing precipitation products to produce soil moisture products with higher estimation accuracy, spatial resolution and temporal resolution in the source region of the Yellow River. Firstly, precipitation observation was added in maqu soil temperature and humidity observation network in the source region of the Yellow River, soil moisture and precipitation observation data on space-time scale were collected, and the early-stage precipitation model was established to estimate soil moisture. The soil moisture model is further estimated by using the remote sensing precipitation products of meteorological satellites and the previous precipitation, and the soil moisture retrieved from satellite microwave remote sensing data is assimilated to produce soil moisture products with high temporal resolution. Finally, maqu soil temperature and humidity observation network data were used to verify the estimated high temporal resolution soil moisture products. The results of this project can provide data support for studies on the evolution of water resources and ecological environment systems in the source region of the Yellow River and expand the application fields of domestic meteorological satellite products.