Detailed investigation of the role of buoy wind errors in buoyscatterometer disagreement

Schlundt, Michael, Farrar, J. T., Bigorre, S., Plueddemann, A. J. and Weller, R. A. (2019) Detailed investigation of the role of buoy wind errors in buoyscatterometer disagreement [Poster] In: ESA LPS 2019, 13.-17.05.2019, Milan, Italy.

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The comparison of equivalent neutral winds obtained from (a) four WHOI buoys in the subtropics and (b) scatterometer estimates at those locations reveals a very low root-mean-square difference (RMS) on the order of 0.5-0.7 m/s and a seasonal cycle in the RMS. To investigate this RMS, different buoy wind error sources were examined. Our buoys are particularly well suited to examine two important sources of buoy error: (1) redundant anemometers and a comparison with numerical flow simulations allow us to quantitatively assess flow distortion errors, and (2) one-minute sampling at the buoys allows us to examine the sensitivity of buoy temporal sampling/averaging in the buoy-scatterometer comparisons. The flow distortion can be estimated to up to 5% of the relative difference of the anemometers. Application of this error to the individual anemometer and subsequent comparison with scatterometer estimates show a good agreement. Application of a reasonable time averaging, subtraction of a mean bias, and application of a viscosity correction generally reduces the RMS but cannot explain the seasonal cycle of it.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Woods Hole
Date Deposited: 04 Nov 2019 09:36
Last Modified: 04 Nov 2019 09:36

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