Cross-calibration of brightness temperature obtained by FY-3B/MWRI using Aqua/AMSR-E data for snow depth retrieval in the Arctic

Haihua Chen; Lele Li; Lei Guan

doi:10.1007/s13131-021-1717-2

Volume 40 Issue 1

Feb. 2021

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Article Navigation > Acta Oceanologica Sinica > 2021 > 40(1): 43-53

Haihua Chen, Lele Li, Lei Guan. Cross-calibration of brightness temperature obtained by FY-3B/MWRI using Aqua/AMSR-E data for snow depth retrieval in the Arctic[J]. Acta Oceanologica Sinica, 2021, 40(1): 43-53. doi: 10.1007/s13131-021-1717-2

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Haihua Chen, Lele Li, Lei Guan. Cross-calibration of brightness temperature obtained by FY-3B/MWRI using Aqua/AMSR-E data for snow depth retrieval in the Arctic[J]. Acta Oceanologica Sinica, 2021, 40(1): 43-53. doi: 10.1007/s13131-021-1717-2

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Cross-calibration of brightness temperature obtained by FY-3B/MWRI using Aqua/AMSR-E data for snow depth retrieval in the Arctic

doi: 10.1007/s13131-021-1717-2

Haihua Chen¹,
Lele Li¹,
Lei Guan^{1
,
,}

College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China

Funds: The National Key Research and Development Program of China under contract Nos 2019YFA0607001 and 2016YFC1402704; the Global Change Research Program of China under contract No. 2015CB9539011.

More Information

Corresponding author: E-mail: leiguan@ouc.edu.cn
Received Date: 2020-09-25
Accepted Date: 2020-10-22

Available Online: 2021-04-21

Publish Date: 2021-01-25

Abstract

Abstract

This study cross-calibrated the brightness temperatures observed in the Arctic by using the FY-3B/MWRI L1 and the Aqua/AMSR-E L2A. The monthly parameters of the cross-calibration were determined and evaluated using robust linear regression. The snow depth in case of seasonal ice was calculated by using parameters of the cross-calibration of data from the MWRI T_b. The correlation coefficients of the H/V polarization among all channels T_b of the two sensors were higher than 0.97. The parameters of the monthly cross-calibration were useful for the snow depth retrieval using the MWRI. Data from the MWRI T_b were cross-calibrated to the AMSR-E baseline. Biases in the data of the two sensors were optimized to approximately 0 K through the cross-calibration, the standard deviations decreased significantly in the range of 1.32 K to 2.57 K, and the correlation coefficients were as high as 99%. An analysis of the statistical distributions of the histograms before and after cross-calibration indicated that the FY-3B/MWRI T_b data had been well calibrated. Furthermore, the results of the cross-calibration were evaluated by data on the daily average T_b at 18.7 GHz, 23.8 GHz, and 36.5 GHz (V polarization), and at 89 GHz (H/V polarization), and were applied to the snow depths retrieval in the Arctic. The parameters of monthly cross-calibration were found to be effective in terms of correcting the daily average T_b. The results of the snow depths were compared with those of the calibrated MWRI and AMSR-E products. Biases of 0.18 cm to 0.38 cm were observed in the monthly snow depths, with the standard deviations ranging from 4.19 cm to 4.80 cm.
- FY-3B,
- AMSR-E,
- brightness temperature (T_b),
- cross-calibration,
- snow depth,
- Arctic

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References(34)

References

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