[Eoas-seminar] COAPS Short Seminar Series

[eoas-seminar at lists.fsu.edu]

COAPS Short Seminar Series
11:00 AM July 7th
Attend F2F (in 255 Research A) or Virtually (via Zoom)
https://fsu.zoom.us/j/92268262553<https://urldefense.com/v3/__https:/fsu.zoom.us/j/92268262553__;!!PhOWcWs!wZt_bDONSRk3OH93Wt1nMsR9gNNTus-Mf9gaoCjEXsRoSmJxegZ2I0ErN_off8Mr4LpvzYS-WasMhbgWqDKI1zU$>

Meeting ID: 922 6826 2553
Talks are 12 minutes long with an additional 8 minutes for questions.

Impact of Swells on Scatterometer Wind Speed Retrieval
By Sthitapragya Ray
Description: 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.
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.



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