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Validation and intercomparison of ocean wave spectra inversion schemes using ASAR wave mode data

Li, Xiao-Ming and König, Thomas and Schulz-Stellenfleth, Johannes and Lehner, Susanne (2010) Validation and intercomparison of ocean wave spectra inversion schemes using ASAR wave mode data. International Journal of Remote Sensing, 31 (17), pp. 4969-4993. Taylor & Francis. DOI: 10.1080/01431161.2010.485222.

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Official URL: http://dx.doi.org/10.1080/01431161.2010.485222

Abstract

This paper presents a validation and intercomparison of the non-linear Partition Rescaling and Shift Algorithm (PARSA) for deriving full two-dimensional ocean wave spectra from ENIVSAT Advanced Synthetic Aperture Radar (ASAR) Wave Mode (WM) data. ASAR WM data acquired globally are used for the validation exercise by comparing the retrieved significant wave height (SWH), zero up-crossing wave period (Tm02), swell SWH (H12, for waves with a period longer than 12 s), mean wave frequency and mean wave direction to in situ buoy measurements and results from the European Centre for Medium-Range Weather Forecast (ECMWF) reanalysis wave model and the Deutscher Wetterdienst (DWD) forecast wave model. An intercomparison of results from the PARSA algorithm with those from the quasi-linear retrieval algorithm adopted by the European Space Agency (ESA) to generate the ASAR WM level-2 product (ASA_WVW_2P, termed WVW hereafter) is also presented in this paper. In addition to the intercomparison with the existing ASAR WM WVW product, sea state parameters (SWH and Tm02), integrated from the PARSA spectra are also compared to the results derived using the empirical algorithm CWAVE_ENV. Validation results indicate that the PARSA inversion can yield full two-dimensional ocean wave spectra. The retrieved SWH corresponds well to buoy measurements with a scatter index of 21%, as demonstrated by 1247 collocated data pairs. By comparing SWH to the ECMWF reanalysis wave model and the DWD forecast wave model, better agreement is achieved, with scatter indices of 9% and 16%, respectively. In addition to comparing conventional integral wave parameters normally used to assess the quality of inverted spectra, a comparison of individual PARSA spectra chosen in different sea state with the nearest numerical wave model spectra and the WVW spectra is performed to illustrate two-dimensional spectral differences.

Document Type:Article
Title:Validation and intercomparison of ocean wave spectra inversion schemes using ASAR wave mode data
Authors:
AuthorsInstitution or Email of Authors
Li, Xiao-MingXiao.Li@dlr.de
König, ThomasThomas.Koenig@dlr.de
Schulz-Stellenfleth, JohannesUNSPECIFIED
Lehner, SusanneSusanne.Lehner@dlr.de
Date:28 September 2010
Journal or Publication Title:International Journal of Remote Sensing
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:31
DOI:10.1080/01431161.2010.485222
Page Range:pp. 4969-4993
Publisher:Taylor & Francis
Status:Published
Keywords:ASAR wave mode, ocean wave spectra, validation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Marine Remote Sensing
Deposited By: Xiao Ming Li
Deposited On:29 Oct 2010 10:46
Last Modified:13 Feb 2013 14:58

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