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  Analysis of SMOS brightness temperature and vegetation optical depth data with coupled land surface and radiative transfer models in Southern Germany

Schlenz, F., dall'Amico, J. T., Mauser, W., & Loew, A. (2012). Analysis of SMOS brightness temperature and vegetation optical depth data with coupled land surface and radiative transfer models in Southern Germany. Hydrology and Earth System Sciences, 16, 3517-3533. doi:10.5194/hess-16-3517-2012.

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資料種別: 学術論文

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hess-16-3517-2012.pdf (出版社版), 858KB
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https://hdl.handle.net/11858/00-001M-0000-0010-3A70-5
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hess-16-3517-2012.pdf
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 作成者:
Schlenz, F., 著者
dall'Amico, J. T., 著者
Mauser, W., 著者
Loew, Alexander1, 2, 著者           
所属:
1Terrestrial Remote Sensing / HOAPS, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913559              
2CRG Terrestrial Remote Sensing, Research Area A: Climate Dynamics and Variability, The CliSAP Cluster of Excellence, External Organizations, Bundesstraße 53, 20146 Hamburg, DE, ou_2025291              

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 要旨: Soil Moisture and Ocean Salinity (SMOS) L1c brightness temperature and L2 optical depth data are analysed with a coupled land surface (PROMET) and radiative transfer model (L-MEB). The coupled models are validated with ground and airborne measurements under contrasting soil moisture, vegetation and land surface temperature conditions during the SMOS Validation Campaign in May and June 2010 in the SMOS test site Upper Danube Catchment in southern Germany. The brightness temperature root-mean-squared errors are between 6K and 9 K. The L-MEB parameterisation is considered appropriate under local conditions even though it might possibly be further optimised. SMOS L1c brightness temperature data are processed and analysed in the Upper Danube Catchment using the coupled models in 2011 and during the SMOS Validation Campaign 2010 together with airborne L-band brightness temperature data. Only low to fair correlations are found for this comparison (R between 0.1-0.41). SMOS L1c brightness temperature data do not show the expected seasonal behaviour and are positively biased. It is concluded that RFI is responsible for a considerable part of the observed problems in the SMOS data products in the Upper Danube Catchment. This is consistent with the observed dry bias in the SMOS L2 soil moisture products which can also be related to RFI. It is confirmed that the brightness temperature data from the lower SMOS look angles and the horizontal polarisation are less reliable. This information could be used to improve the brightness temperature data filtering before the soil moisture retrieval. SMOS L2 optical depth values have been compared to modelled data and are not considered a reliable source of information about vegetation due to missing seasonal behaviour and a very high mean value. A fairly strong correlation between SMOS L2 soil moisture and optical depth was found (R = 0.65) even though the two variables are considered independent in the study area. The value of coupled models as a tool for the analysis of passive microwave remote-sensing data is demonstrated by extending this SMOS data analysis from a few days during a field campaign to a longer term comparison.

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言語: eng - English
 日付: 2012-102012-10
 出版の状態: 出版
 ページ: -
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 目次: -
 査読: 査読あり
 識別子(DOI, ISBNなど): DOI: 10.5194/hess-16-3517-2012
 学位: -

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出版物 1

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出版物名: Hydrology and Earth System Sciences
  その他 : HESS
種別: 学術雑誌
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出版社, 出版地: European Geosciences Union
ページ: - 巻号: 16 通巻号: - 開始・終了ページ: 3517 - 3533 識別子(ISBN, ISSN, DOIなど): その他: 1607-7938
CoNE: https://pure.mpg.de/cone/journals/resource/1607-7938