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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1002/2017GL075656
|2 doi
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|a eng
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| 100 |
1 |
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|a Dong, Jianzhi
|e verfasserin
|4 aut
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| 245 |
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|a The error structure of the SMAP single and dual channel soil moisture retrievals
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 29.03.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Knowledge of the temporal error structure for remotely sensed surface soil moisture retrievals can improve our ability to exploit them for hydrologic and climate studies. This study employs a triple collocation analysis to investigate both the total variance and temporal auto-correlation of errors in Soil Moisture Active and Passive (SMAP) products generated from two separate soil moisture retrieval algorithms, the vertically-polarized brightness temperature based Single Channel Algorithm (SCA-V, the current baseline SMAP algorithm) and the Dual Channel Algorithm (DCA). A key assumption made in SCA-V is that real-time vegetation opacity can be accurately captured using only a climatology for vegetation opacity. Results demonstrate that, while SCA-V generally outperforms DCA, SCA-V can produce larger total errors when this assumption is significantly violated by inter-annual variability in vegetation health and biomass. Furthermore, larger auto-correlated errors in SCA-V retrievals are found in areas with relatively large vegetation opacity deviations from climatological expectations. This implies that a significant portion of the auto-correlated error in SCA-V is attributable to the violation of its vegetation opacity climatology assumption and suggests that utilizing a real (as opposed to climatological) vegetation opacity time series in the SCA-V algorithm would reduce the magnitude of auto-correlated soil moisture retrieval errors
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|a Journal Article
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1 |
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|a Crow, Wade
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bindlish, Rajat
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Geophysical research letters
|d 1984
|g 45(2018), 2 vom: 28. Jan., Seite 758-765
|w (DE-627)NLM098182501
|x 0094-8276
|7 nnns
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| 773 |
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|g volume:45
|g year:2018
|g number:2
|g day:28
|g month:01
|g pages:758-765
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|u http://dx.doi.org/10.1002/2017GL075656
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