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L-Band Vegetation optical depth and effective scattering albedo estimation from SMAP

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L-Band Vegetation optical depth and effective scattering albedo estimation from SMAP

dc.contributor.author	Konings, Alexandra G.
dc.contributor.author	Piles Guillem, Maria
dc.contributor.author	Das, Narendra
dc.contributor.author	Entekhabi, Dara
dc.date.accessioned	2017-10-25T14:29:54Z
dc.date.available	2017-10-25T14:29:54Z
dc.date.issued	2017
dc.identifier.citation	Konings, Alexandra G. Piles Guillem, Maria Das, Narendra Entekhabi, Dara 2017 L-Band Vegetation optical depth and effective scattering albedo estimation from SMAP Remote Sensing of Environment 198 460 470
dc.identifier.uri	http://hdl.handle.net/10550/62895
dc.description.abstract	Over land the vegetation canopy affects the microwave brightness temperature by emission, scattering and attenuation of surface soil emission. Attenuation, as represented by vegetation optical depth (VOD), is a potentially useful ecological indicator. The NASA Soil Moisture Active Passive (SMAP) mission carries significant potential for VOD estimates because of its radio frequency interference mitigation efforts and because the L-band signal penetrates deeper into the vegetation canopy than the higher frequency bands used for many previous VOD retrievals. In this study, we apply the multi-temporal dual-channel retrieval algorithm (MT-DCA) to derive global VOD, soil moisture, and effective scattering albedo estimates from SMAP Backus-Gilbert enhanced brightness temperatures posted on a 9 km grid and with three day revisit time. SMAP VOD values from the MT-DCA follow expected global distributions and are shown to be highly correlated with canopy height. They are also broadly similar in magnitude (though not always in seasonal amplitude) to European Space Agency Soil Moisture and Ocean Salinity (SMOS) VOD. The SMOS VOD values are based on angular brightness temperature information while the SMAP measurements are at a constant incidence angle, requiring an alternate approach to VOD retrieval presented in this study. Globally, albedo values tend to be high over regions with heterogeneous land cover types. The estimated effective scattering albedo values are generally higher than those used in previous soil moisture estimation algorithms and linked to biome classifications. MT-DCA retrievals of soil moisture show only small random differences with soil moisture retrievals from the Baseline SMAP algorithm, which uses a prior estimate of VOD based on land cover and optical data. However, significant biases exist between the two datasets. The soil moisture biases follow the pattern of differences between the MT-DCA retrieved and Baseline-assigned VOD values.
dc.language.iso	eng
dc.relation.ispartof	Remote Sensing of Environment, 2017, vol. 198, p. 460-470
dc.subject	Radiació Mesurament
dc.subject	Vegetació
dc.subject	Imatges Processament
dc.title	L-Band Vegetation optical depth and effective scattering albedo estimation from SMAP
dc.type	journal article	es_ES
dc.date.updated	2017-10-25T14:29:54Z
dc.identifier.doi	10.1016/j.rse.2017.06.037
dc.identifier.idgrec	120724
dc.rights.accessRights	open access	es_ES