Agricultural Drought Monitoring via the Assimilation of SMAP Soil Moisture Retrievals Into a Global Soil Water Balance Model

被引：53

作者：

Mladenova, Iliana E. ^{[1
,2
]}

Bolten, John D. ^{[1
]}

Crow, Wade ^{[3
]}

Sazib, Nazmus ^{[1
,4
]}

Reynolds, Curt ^{[5
]}

机构：

[1] NASA GSFC, Hydrol Sci Lab 617, Greenbelt, MD 20771 USA

[2] UMD, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA

[3] USDA ARS, Hydrol & Remote Sensing Lab, Beltsville, MD USA

[4] Sci Applicat Int Corp, Lanham, MD USA

[5] USDA FAS, Washington, DC USA

来源：

FRONTIERS IN BIG DATA | 2020年 / 3卷

关键词：

agricultural drought; soil moisture; SMAP; hydrologic modeling; data assimilation; SPOT-VEGETATION; TIME-SERIES; VALIDATION; INDEX; DATASET; AVHRR; MODIS;

D O I：

10.3389/fdata.2020.00010

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

From an agricultural perspective, drought refers to an unusual deficiency of plant available water in the root-zone of the soil profile. This paper focuses on evaluating the benefit of assimilating soil moisture retrievals from the Soil Moisture Active Passive (SMAP) mission into the USDA-FAS Palmer model for agricultural drought monitoring. This will be done by examining the standardized soil moisture anomaly index. The skill of the SMAP-enhanced Palmer model is assessed over three agricultural regions that have experienced major drought since the launch of SMAP in early 2015: (1) the 2015 drought in California (CA), USA, (2) the 2017 drought in South Africa, and (3) the 2018 mid-winter drought in Australia. During these three events, the SMAP-enhanced Palmer soil moisture estimates (PM+SMAP) are compared against the Climate Hazards group Infrared Precipitation with Stations (CHIRPS) rainfall dataset and Normalized Difference Vegetation Index (NDVI) products. Results demonstrate the benefit of assimilating SMAP and confirm its potential for improving U.S. Department of Agriculture-Foreign Agricultural Service root-zone soil moisture information generated using the Palmer model. In particular, PM+SMAP soil moisture estimates are shown to enhance the spatial variability of Palmer model root-zone soil moisture estimates and adjust the Palmer model drought response to improve its consistency with ancillary CHIRPS precipitation and NDVI information.

引用

页数：16

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