Arid
DOI10.1016/j.jhydrol.2014.02.015
A spatially coherent global soil moisture product with improved temporal resolution
de Jeu, Richard A. M.1; Holmes, Thomas R. H.2; Parinussa, Robert M.1; Owe, Manfred3
通讯作者de Jeu, Richard A. M.
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
出版年2014
卷号516页码:284-296
英文摘要

Global soil moisture products that are completely independent of any type of ancillary data and solely rely on satellite observations are presented. Additionally, we further develop an existing downscaling technique that enhances the spatial resolution of such products to approximately 11 km. These products are based on internal modules of the Land Parameter Retrieval Model (LPRM), an algorithm that uses the radiative transfer equation to link soil moisture, vegetation optical depth and land surface temperature to observed brightness temperatures.


The soil moisture product that is independent of any type of ancillary data uses the internally calculated dielectric constant as a soil moisture proxy. This data product is not influenced by errors associated with coarse-scale global soil property maps or by any other type of forcing (e.g. re-analysis) data and is therefore solely based on satellite microwave observations. The second step builds upon recent developments to increase the spatial resolution of the LPRM retrievals using a smoothing filter downscaling method. With this method we can attain a spatial resolution that can be more useful at the scale of local and regional hydrological studies as well. The steps presented in this paper were applied to observations from the Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E). The newly derived data sets were validated using ground-based observations from the International Soil Moisture Network (ISMN).


The internally calculated dielectric constant product results in significantly more days with valid retrievals than the original soil moisture data products, in particular over arid regions. The dielectric constant product resulted in similar correlations with in situ data as the original soil moisture data product. Together, these findings demonstrate the usefulness of this new dielectric constant product for the hydrological modeling community and climate studies. A case study on the Australian Fitzroy catchment demonstrated that the downscaled data product has a more detailed spatial description of soil moisture, especially during wet and dry conditions with more pronounced dry and wet regions within the catchment. The increased resolution data products could therefore improve runoff predictions and this study demonstrated the potential added value of a transitioning from a spatial resolution of 56 km toward a higher resolution of 11 km. The hydrological implications of these newly developed data records are not only linked to AMSR-E satellite data, but also to the next generation Soil Moisture Active and Passive (SMAP) mission where a 9 km spatial resolution is the target resolution for satellite soil moisture products. The new data products will not replace the current LPRM products, but will be added to the existing array of data products and will become publicly available through our data portals. (C) 2014 Elsevier B.V. All rights reserved.


英文关键词Soil moisture Dielectric constant Passive microwave radiometry Remote sensing
类型Article
语种英语
国家Netherlands ; USA
收录类别SCI-E
WOS记录号WOS:000339036100026
WOS关键词VEGETATION OPTICAL DEPTH ; MICROWAVE ; RETRIEVAL ; MODEL ; VALIDATION ; METHODOLOGY ; VARIABILITY ; PATTERNS ; TREND ; SPACE
WOS类目Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Engineering ; Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/183440
作者单位1.Vrije Univ Amsterdam, Dept Earth Sci Earth & Climate Cluster, NL-1081 HV Amsterdam, Netherlands;
2.ARS, USDA, Hydrol & Remote Sensing Lab, Beltsville, MD 20705 USA;
3.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20770 USA
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de Jeu, Richard A. M.,Holmes, Thomas R. H.,Parinussa, Robert M.,et al. A spatially coherent global soil moisture product with improved temporal resolution[J],2014,516:284-296.
APA de Jeu, Richard A. M.,Holmes, Thomas R. H.,Parinussa, Robert M.,&Owe, Manfred.(2014).A spatially coherent global soil moisture product with improved temporal resolution.JOURNAL OF HYDROLOGY,516,284-296.
MLA de Jeu, Richard A. M.,et al."A spatially coherent global soil moisture product with improved temporal resolution".JOURNAL OF HYDROLOGY 516(2014):284-296.
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