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COAPS Short Seminar Series</div>
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11:00 AM July 7th</div>
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<span style="color: rgb(5, 99, 193);"><u><a href="https://urldefense.com/v3/__https:/fsu.zoom.us/j/92268262553__;!!PhOWcWs!wZt_bDONSRk3OH93Wt1nMsR9gNNTus-Mf9gaoCjEXsRoSmJxegZ2I0ErN_off8Mr4LpvzYS-WasMhbgWqDKI1zU$" id="OWAe7b8f8da-6c2d-f593-a1be-e00f73b7f61a" class="OWAAutoLink" style="color: rgb(5, 99, 193);">https://fsu.zoom.us/j/92268262553</a></u></span><span style="color: rgb(0, 0, 0);"><br>
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Meeting ID: 922 6826 2553</span></div>
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Talks are 12 minutes long with an additional 8 minutes for questions.</div>
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Impact of Swells on Scatterometer Wind Speed Retrieval</div>
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By Sthitapragya Ray</div>
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Description:<b> </b>Ocean surface waves span over a wide range of wavelengths. Longer-wavelength waves are associated with swell systems, which are generated by high-wind speed events and can travel long distances from their origin. In contrast, centimeter-scale
capillary-gravity waves, are generated as a near-instantaneous response to local wind stress. Satellite scatterometers measure ocean surface winds through the backscatter of centimeter-length microwave pulses reflected from these capillary-gravity waves. Several
studies have highlighted that the accuracy of a scatterometer's 10-m wind speed retrieval depends on sea state parameters, such as the height of the swell or its steepness. However, the underlying mechanisms and the magnitude of this effect remain ambiguous.
Inaccuracies in scatterometer retrieval can arise from two main mechanisms. First, swells can directly influence the generation and dissipation of capillary-gravity waves and, consequently, the backscatter signal. Secondly, swells can modify the backscatter
by altering the tilt of the ocean surface on which capillary-gravity waves are superimposed. In either case, the 10 m neutral wind speeds inferred from the swell-affected backscatter may result in inaccurate wind speed retrievals. The ASCAT (Metop-B) wind
speed retrieval errors relative to tropical moored buoys are estimated through 3 different statistical tests while systematically accounting for the influence of different swell directions relative to the scatterometer swath. Comparing ASCAT retrieval errors
across varying wind-swell-swath orientations illustrates that the presence of steep swells reduces the ASCAT-observed wind speeds. An asymmetry in wind speed retrieval errors was also observed between upwind and downwind scatterometer look angles, when winds
and swells are mutually aligned.</div>
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NOTE: Please feel free to forward/share this invitation with other groups/disciplines that might be interested in this talk/topic. All are welcome to attend.</div>
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