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Article

Intercalibration of ASCAT Scatterometer Winds from MetOp-A, -B, and -C, for a Stable Climate Data Record

Remote Sensing Systems, 444 10th Street, Suite 200, Santa Rosa, CA 95401, USA
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Academic Editor: Ali Khenchaf
Remote Sens. 2021, 13(18), 3678; https://doi.org/10.3390/rs13183678
Received: 5 August 2021 / Revised: 31 August 2021 / Accepted: 10 September 2021 / Published: 15 September 2021
(This article belongs to the Special Issue Remote Sensing of Ocean Surface Winds)
Scatterometers provide very stable ocean vector wind data records. This is because they measure the ratio of backscattered to incident microwave signal over the ocean surface as opposed to an absolute quantity (e.g., emitted microwave signal). They provide an optimal source of observations for building a long ocean vector wind Climate Data Record (CDR). With this objective in mind, observations from different satellite platforms need to be assessed for high absolute accuracy versus a common ground truth and for fine cross-calibration during overlapping periods. Here we describe the methodology for developing a CDR of ocean surface winds from the C-band ASCAT scatterometers onboard MetOp-A, -B, and -C. This methodology is based on the following principles: a common Geophysical Model Function (GMF) and wind algorithm developed at Remote Sensing Systems (RSS) and the use of in situ and satellite winds to cross-calibrate the three scatterometers within the accuracy required for CDRs, about 0.1 m/s at the global monthly scale. Using multiple scatterometers and radiometers for comparison allows for the opportunity to isolate sensors that are drifting or experiencing step-changes as small as 0.05 m/s. We detected and corrected a couple of such changes in the ASCAT-A wind record. The ASCAT winds are now very stable over time and well cross-calibrated with each other. The full C-band wind CDR now covers 2007-present and can be easily extended in the next decade with the launch of the MetOp Second Generation scatterometers. View Full-Text
Keywords: ASCAT; ocean surface winds; scatterometers; Climate Data Records; satellite intercalibration ASCAT; ocean surface winds; scatterometers; Climate Data Records; satellite intercalibration
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MDPI and ACS Style

Ricciardulli, L.; Manaster, A. Intercalibration of ASCAT Scatterometer Winds from MetOp-A, -B, and -C, for a Stable Climate Data Record. Remote Sens. 2021, 13, 3678. https://doi.org/10.3390/rs13183678

AMA Style

Ricciardulli L, Manaster A. Intercalibration of ASCAT Scatterometer Winds from MetOp-A, -B, and -C, for a Stable Climate Data Record. Remote Sensing. 2021; 13(18):3678. https://doi.org/10.3390/rs13183678

Chicago/Turabian Style

Ricciardulli, Lucrezia, and Andrew Manaster. 2021. "Intercalibration of ASCAT Scatterometer Winds from MetOp-A, -B, and -C, for a Stable Climate Data Record" Remote Sensing 13, no. 18: 3678. https://doi.org/10.3390/rs13183678

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