Intercomparison of bulk aerodynamic algorithms for the computation of sea surface fluxes using TOGA COARE and TAO data

Xubin Zeng, Ming Zhao, Robert E. Dickinson

Research output: Contribution to journalArticle

454 Citations (Scopus)

Abstract

A bulk aerodynamic algorithm is developed for all stability conditions for the computation of ocean surface fluxes. It provides roughness lengths of wind, humidity, and temperature for a wind speed range from 0 to 18 m s-1: z(o) = 0.013u(*)2/g + 0.11ν/u(*) and ln(z(o)/z(ot)) = ln(z(o)/z(oq)) = 2.67Re(*)(1/4) - 2.57 as derived using the Tropical Oceans Global Atmosphere (TOGA) Coupled Ocean-Atmosphere Response Experiment (COARE) data constrained by other observations under high wind conditions. Using the TOGA COARE ship data and the multiyear hourly TOGA Tropical Atmosphere-Ocean moored buoy data, intercomparison of six different algorithms, which are widely used in research, operational forecasting, and data reanalysis, shows that algorithms differ significantly in heat and momentum fluxes under both very weak and very strong wind conditions, but agree with each other under moderate wind conditions. Algorithms agree better for wind stress than for heat fluxes. Based on past observations, probable deficiencies in roughness lengths (or neutral exchange coefficients) of some of the algorithms are identified along with possible solutions, and significant issues (particularly the trend of the neutral exchange coefficient for heat with wind speed under strong wind conditions) are raised for future experiments. The vapor pressure reduction of 2% over saline seawater has a significant impact on the computation of surface latent heat flux under strong wind conditions and should be considered in any bulk aerodynamic algorithm.

Original languageEnglish (US)
Pages (from-to)2628-2644
Number of pages17
JournalJournal of Climate
Volume11
Issue number10
StatePublished - Oct 1998

Fingerprint

TOGA-COARE
surface flux
aerodynamics
sea surface
roughness
wind velocity
data buoy
atmosphere
latent heat flux
global ocean
wind stress
vapor pressure
heat flux
momentum
humidity
seawater
ocean

Keywords

  • Aerodynamics
  • Air-sea interaction
  • Algorithm
  • Sea surface
  • Surface flux
  • TOGA-COARE

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Intercomparison of bulk aerodynamic algorithms for the computation of sea surface fluxes using TOGA COARE and TAO data. / Zeng, Xubin; Zhao, Ming; Dickinson, Robert E.

In: Journal of Climate, Vol. 11, No. 10, 10.1998, p. 2628-2644.

Research output: Contribution to journalArticle

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