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ERS-2 SAR Wave Mode Monthly Quality Assessment

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ERS-2 SAR Wave Mode Monthly Quality Assessment

This bulletin provides a monthly assessment of the geophysical products from ERS-1 SAR Wave Mode (SAR_WVW_2P). The validation is performed globally using co-located WaveWatch3 (WW3) data from Ifremer. It is based on previous work done by Boost-Technology on Envisat ASAR monitoring.

Backscatter

http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_backscatter_map_glo_{yyyy}-{MM}-{dd}.png

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Global map of backscatter value (?0) [dB]

Backscatter comparisons

In this part, the WW3 backscatter values refer to the output of the empirical CMOD-IFR2 model fed with ECMWF winds (speed and directions). Incidence angle values of WV points are used to estimate CMOD-IFR2 outputs.

Comparisons between backscatter values ?0 of WVW data and WW3 (i.e. CMOD-IFR2+ECMWF wind) for different wind directions

Significant Wave Height (SWH) analysis

http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_swh_difference_map_glo_{yyyy}-{MM}-{dd}.png

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Global distribution of the difference between WVW SWH and WW3 SWH.

Regional distribution of the difference between WVW SWH and WW3 SWH.

Distribution of the difference between mean period of WVW and WW3 (a). Scatter plot of mean period of WW3 vs WVW (b).

Regional analysis of the wave directional distribution

Angular distribution of WW3 wind speed	Angular distribution of WVW significant wave height	Angular distribution of WW3 significant height
http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/model_wind_directional_distribution_nor_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_swh_directional_distribution_nor_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/ww3_swh_directional_distribution_nor_{yyyy}-{MM}-{dd}.png
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Northern Hemisphere (30°N < Latitude 70°N)
http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/model_wind_directional_distribution_tro_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_swh_directional_distribution_tro_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/ww3_swh_directional_distribution_tro_{yyyy}-{MM}-{dd}.png
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Tropical Zones (-25°N < Latitude 25°N)
http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/model_wind_directional_distribution_sou_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_swh_directional_distribution_sou_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/ww3_swh_directional_distribution_sou_{yyyy}-{MM}-{dd}.png
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Southern Hemisphere (-70°N < Latitude -30°N)
http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/model_wind_directional_distribution_glo_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_swh_directional_distribution_glo_{yyyy}-{MM}-{dd}.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/ww3_swh_directional_distribution_glo_{yyyy}-{MM}-{dd}.png
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Global

Mean wave direction relative to SAR

http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_phi_difference_glo_{yyyy}-{MM}-{dd}_WW3.png

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Global comparison between SAR and WW3 mean wave direction relative to SAR (in deg)

Regional comparison between SAR and WW3 mean wave direction relative to SAR (in deg)

Global distribution of the ASAR WVW azimuth cutoff values

Global map of SAR WVW azimuth cut-off values (left), and similar coverage of co-located ECMWF wind speed values (right)

Analysis of the normalized variance

http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/swh_nv_scatterplot_glo_{yyyy}-{MM}-{dd}.png

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WVW significant wave height vs. image normalized variance

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http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_backscatter_vs_wind_glo_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_backscatter_histo_glo_{yyyy}-{MM}-{dd}.png
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Backscatter value (?0) [dB] as a function of wind speed. The Upper (resp. lower) line represents the CMOD-IFR2 empirical scattering model for Upwind (resp. crosswind) cases	Histogram of the WVW backscatter value *(?0) [dB]*

http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_backscatter_scatterplot_Global_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_incidence_histo_glo_{yyyy}-{MM}-{dd}.png
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Comparisons between backscatter values ?0 of WVW data and WW3 (i.e. CMOD-IFR2+ECMWF wind)	Histogram of incidence angle.

http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_swh_difference_scatter_glo_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_swh_difference_wind_impact_glo_{yyyy}-{MM}-{dd}_WW3.png
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Scatter plot (2D histogram) of Significant Wave Height of WW3 spectra vs. WVW	Scatter plot of Significant Wave Height of WW3 spectra vs. WVW as a function of wind speed. Bins size are proportional to data occurence

http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_backscatter_scatterplot_UpWinds_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_backscatter_scatterplot_CrossWinds_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_backscatter_scatterplot_DownWinds_{yyyy}-{MM}-{dd}_WW3.png
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http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_swh_difference_histo_nor_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_swh_difference_histo_tro_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_swh_difference_histo_sou_{yyyy}-{MM}-{dd}_WW3.png
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http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_period_difference_scatter_glo_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_period_difference_histo_glo_{yyyy}-{MM}-{dd}_WW3.png
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http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_phi_difference_nor_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_phi_difference_tro_{yyyy}-{MM}-{dd}_WW3.png	http://www.ifremer.fr/cersat/images/esa/sarqc/ers2/ww3/{yyyy}/{MM}/sar_model_phi_difference_sou_{yyyy}-{MM}-{dd}_WW3.png
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Laboratoire d'Oceanographie Spatiale

ERS-2 SAR Wave Mode Monthly Quality Assessment

Backscatter

Backscatter comparisons

Significant Wave Height (SWH) analysis

Regional analysis of the wave directional distribution

Mean wave direction relative to SAR

Global distribution of the ASAR WVW azimuth cutoff values

Analysis of the normalized variance

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