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Zhou Mao, Jin Taoyong, Jiang Weiping. The Wet Tropospheric Correction of Wide-swath Altimeter using Optimum Interpolation Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210008
Citation: Zhou Mao, Jin Taoyong, Jiang Weiping. The Wet Tropospheric Correction of Wide-swath Altimeter using Optimum Interpolation Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210008

The Wet Tropospheric Correction of Wide-swath Altimeter using Optimum Interpolation Method

doi: 10.13203/j.whugis20210008
Funds:

The National Natural Science Foundation of China (41974020, 41721003)

  • Received Date: 2021-01-14
  • Since there is only nadir radiometer onboard for the wide-swath altimetry, the wet tropospheric delay can only be corrected by models inside the cross-swath or substituted by the nadir radiometer measured data, which lead to the lower accuracy. In order to improve the accuracy of wet tropospheric correction (WTC) inside the cross-swath, an optimum interpolation method to fuse the nadir radiometer WTC is proposed, and it is verified by taken the SWOT (Surface Water and Ocean Topography) wide-swath altimeter as example. Inside the cross-swath, when the WTCs from ERA5 (ECMWF Re-Analysis 5th Generation) dataset are used, the residual of WTC after corrected by optimum interpolation can be reduced by 40% compared with the nadir radiometer WTC substituted. When the simulated WTCs from the spectrum of radiometer measured WTCs are used, the residual of WTC after corrected by optimum interpolation can be reduced by 80% in all latitude areas compared with the nadir radiometer WTC substituted. In addition, the optimum interpolation method has much better accuracy than the nadir radiometer WTC substituted in the case of high water vapor variability.
  • [1] Fernandes M, Lázaro C, Nunes A, et al. Atmospheric Corrections for Altimetry Studies over Inland Water[J]. Remote Sensing, 2014, 6(6):4952-4997.
    [2] Fu L-L, Rodriguez E. High-Resolution Measurement of Ocean Surface Topography by Radar Interferometry for Oceanographic and Geophysical Applications[M/OL]. Sparks R S J, Hawkesworth C J.//Geophysical Monograph Series. Washington, D. C. American Geophysical Union, 2004:209-224.
    [3] Rodriguez E, Pollard B, Martin J. Wide-Swath Ocean Altimetry Using Radar Interferometry[J]. IEEE Transactions on Geoscience and Remote Sensing, 1999, 1-52.
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    [6] Pavelsky T M, Durand M T, Andreadis K M, et al. Assessing the Potential Global Extent of SWOT River Discharge Observations[J]. Journal of Hydrology, 2014, 519:1516-1525.
    [7] Gaultier L, Ubelmann C, Fu L-L. The Challenge of Using Future SWOT Data for Oceanic Field Reconstruction[J]. Journal of Atmospheric and Oceanic Technology, 2016, 33(1):119-126.
    [8] Solander K C, Reager J T, Famiglietti J S. How Well Will the Surface Water and Ocean Topography (SWOT) Mission Observe Global Reservoirs?:SWOT OBSERVATIONS OF GLOBAL RESERVOIRS[J]. Water Resources Research, 2016, 52(3):2123-2140.
    [9] Wan X, Jin S, Liu B, et al. Effects of Interferometric Radar Altimeter Errors on Marine Gravity Field Inversion[J]. Sensors, 2020, 20(9):2465-2483.
    [10] Zhou M, Jin T, Li J, et al. Analysis on the Accuracy of Marine Gravity Inversion from the Wide-swath Altimeter Mission[C]//EGU General Assembly Conference Abstracts. 2020.
    [11] Ren L, Yang J, Dong X, et al. Preliminary Evaluation and Correction of Sea Surface Height from Chinese Tiangong-2 Interferometric Imaging Radar Altimeter[J]. Remote Sensing, 2020, 12(15):2496.
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    [13] Steunou N, Desjonquères J D, Picot N, et al. AltiKa Altimeter:Instrument Description and In Flight Performance[J]. Marine Geodesy, 2015, 38(sup1):22-42.
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    [15] Hersbach H, Bell B, Berrisford P, et al. The ERA5 Global Reanalysis[J]. Quarterly Journal of the Royal Meteorological Society, 2020, 146(730):1999-2049.
    [16] Bevis M, Businger S, Herring T A, et al. GPS Meteorology:Remote Sensing of Atmospheric Water Vapor Using the Global Positioning
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The Wet Tropospheric Correction of Wide-swath Altimeter using Optimum Interpolation Method

doi: 10.13203/j.whugis20210008
Funds:

The National Natural Science Foundation of China (41974020, 41721003)

Abstract: Since there is only nadir radiometer onboard for the wide-swath altimetry, the wet tropospheric delay can only be corrected by models inside the cross-swath or substituted by the nadir radiometer measured data, which lead to the lower accuracy. In order to improve the accuracy of wet tropospheric correction (WTC) inside the cross-swath, an optimum interpolation method to fuse the nadir radiometer WTC is proposed, and it is verified by taken the SWOT (Surface Water and Ocean Topography) wide-swath altimeter as example. Inside the cross-swath, when the WTCs from ERA5 (ECMWF Re-Analysis 5th Generation) dataset are used, the residual of WTC after corrected by optimum interpolation can be reduced by 40% compared with the nadir radiometer WTC substituted. When the simulated WTCs from the spectrum of radiometer measured WTCs are used, the residual of WTC after corrected by optimum interpolation can be reduced by 80% in all latitude areas compared with the nadir radiometer WTC substituted. In addition, the optimum interpolation method has much better accuracy than the nadir radiometer WTC substituted in the case of high water vapor variability.

Zhou Mao, Jin Taoyong, Jiang Weiping. The Wet Tropospheric Correction of Wide-swath Altimeter using Optimum Interpolation Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210008
Citation: Zhou Mao, Jin Taoyong, Jiang Weiping. The Wet Tropospheric Correction of Wide-swath Altimeter using Optimum Interpolation Method[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210008
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