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THE SIGNATURE OF SEA SPRAY IN THE HEXOS TURBULENT HEAT EDGAR L ANDREAS
 

Summary: THE SIGNATURE OF SEA SPRAY IN THE HEXOS TURBULENT HEAT
FLUX DATA
EDGAR L ANDREAS
U.S. Army Cold Regions Research and Engineering Laboratory, 72 Lyme Road, Hanover, New
Hampshire 03755-1290, U.S.A.
JANICE DECOSMO
Geophysics Program, University of Washington, Box 351650, Seattle, Washington 98195-1650
U.S.A.
(Received in final form 3 July 2001)
Abstract. The role of sea spray in transferring heat and moisture across the air-sea interface has
remained elusive. Some studies have reported that sea spray does not affect the turbulent air-sea
heat fluxes for 10-m wind speeds up to at least 25 m s-1, while others have reported important spray
contributions for wind speeds as low as 12 m s-1. One goal of the HEXOS (Humidity Exchange over
the Sea) program was to quantify spray's contribution to the turbulent air-sea heat fluxes, but original
analyses of the HEXOS flux data found the spray signal to be too small to be reliably identified
amid the scatter in the data. We look at the HEXOS data again in the context of the TOGA-COARE
bulk flux algorithm and a sophisticated microphysical spray model. This combination of quality data
and state-of-the-art modelling reveals a distinct spray signature in virtually all HEXOS turbulent
heat flux data collected in winds of 15 m s-1 and higher. Spray effects are most evident in the
latent heat flux data, where spray contributes roughly 10% of the total turbulent flux in winds of

  

Source: Andreas, Edgar L - Cold Regions Research and Engineering Laboratory, USACE Engineer Research and Development Center

 

Collections: Geosciences