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Analysis and Inter-Calibration of Wet Path Delay Datasets to Compute the Wet Tropospheric Correction for CryoSat-2 over Ocean
Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Universidade do Porto, 4050-123 Porto, Portugal
Instituto Superior de Engenharia, Instituto Politécnico do Porto, 4200-072 Porto, Portugal
* Author to whom correspondence should be addressed.
Received: 19 April 2013; in revised form: 22 September 2013 / Accepted: 24 September 2013 / Published: 14 October 2013
Abstract: Unlike most altimetric missions, CryoSat-2 is not equipped with an onboard microwave radiometer (MWR) to provide wet tropospheric correction (WTC) to radar altimeter measurements, thus, relying on a model-based one provided by the European Center for Medium-range Weather Forecasts (ECMWF). In the ambit of ESA funded project CP4O, an improved WTC for CryoSat-2 data over ocean is under development, based on a data combination algorithm (DComb) through objective analysis of WTC values derived from all existing global-scale data types. The scope of this study is the analysis and inter-calibration of the large dataset of total column water vapor (TCWV) products from scanning MWR aboard Remote Sensing (RS) missions for use in the WTC computation for CryoSat-2. The main issues regarding the computation of the WTC from all TCWV products are discussed. The analysis of the orbital parameters of CryoSat-2 and all other considered RS missions, their sensor characteristics and inter-calibration is presented, providing an insight into the expected impact of these datasets on the WTC estimation. The most suitable approach for calculating the WTC from TCWV is investigated. For this type of application, after calibration with respect to an appropriate reference, two approaches were found to give very similar results, with root mean square differences of 2 mm.
Keywords: satellite altimetry; CryoSat-2; wet tropospheric correction; total column water vapour; microwave radiometer; sensor calibration
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MDPI and ACS Style
Fernandes, M.J.; Nunes, A.L.; Lázaro, C. Analysis and Inter-Calibration of Wet Path Delay Datasets to Compute the Wet Tropospheric Correction for CryoSat-2 over Ocean. Remote Sens. 2013, 5, 4977-5005.
Fernandes MJ, Nunes AL, Lázaro C. Analysis and Inter-Calibration of Wet Path Delay Datasets to Compute the Wet Tropospheric Correction for CryoSat-2 over Ocean. Remote Sensing. 2013; 5(10):4977-5005.
Fernandes, M. J.; Nunes, Alexandra L.; Lázaro, Clara. 2013. "Analysis and Inter-Calibration of Wet Path Delay Datasets to Compute the Wet Tropospheric Correction for CryoSat-2 over Ocean." Remote Sens. 5, no. 10: 4977-5005.