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Sea-Surface Stress Driven by Small-Scale Non-stationary Winds

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ARTICLE DOWNLOAD

Sea-Surface Stress Driven by Small-Scale Non-stationary Winds

10$

L. Mahrt, Erik Nilsson, Anna Rutgersson & Heidi Pettersson 

Abstract

A number of studies have indicated that non-stationarity of the wind field over the sea significantly disrupts the equilibrium between the wind, stress, and wave fields. However, no studies have systematically examined the impact of non-stationarity using a large dataset. Here, we examine the effect of non-stationarity of the wind field on the stress by analyzing six years of turbulent flux data from the Östergarnsholm site. On average, the impact of the non-stationarity on the stress and drag coefficient becomes important for wind speeds less than about 6 m s−1−1. Differences between the acceleration and deceleration stages are revealed by phase shifting the calculation of the non-stationarity with respect to the calculation of the stress and drag coefficient. The time structure of events is examined by selecting samples of large increases and decreases of the wind speed. Analyses needed for further progress are noted.

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Year 2020
Language English
Format PDF
DOI 10.1007/s10546-020-00518-9