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NASA Global analysis of ocean surface fluxes of heat and freshwater NEWS Project Team: J. Curry, C.A. Clayson, P.J. Webster, E. DiLorenzo, A. Romanou. Science Issue: Ocean surface turbulent heat fluxes

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Science Issue: Ocean surface turbulent heat fluxes

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Science issue ocean surface turbulent heat fluxes

NASA Global analysis of ocean surface fluxes of heat and freshwater NEWS

Project Team: J. Curry, C.A. Clayson, P.J. Webster, E. DiLorenzo, A. Romanou

Science Issue: Ocean surface turbulent heat fluxes

Approach: analysis and blending of global satellite and NWP surface flux products

Satellite Data: SSM/I, scatterometers, surface radiation fluxes,

Other Data: SEAFLUX in situ data set, satellite derived precipand radiation flux products

Models: Reanalysis products, CMEP simulations, Regional Ocean Model

Study Particulars: produce 20 year blended flux product

Project Status:

Year 1 & 2: new 3 hourly SST product with diurnal cycle, 1999 flux evaluation study

Year 3: complete production of new flux data set for 1996-2006; apply data sets

Year 4 & 5: evaluate new flux data set, reprocess as needed, continue regional ocean

applications, evaluate U.S. CMEP models


Science issue ocean surface turbulent heat fluxes

NEWS (Latent Heat Flux)

Jan. 1999 (Global Test)

Data sources

SST (NOAA)

Wind (NCDC)

Qa (Jackson et al)

Ta (NCEP2)

With Wave Spectra

No Wave Spectra

Flux Algorithm (Bourassa et al), which

considers wave spectra.

With wave spectra, latent heat flux

is reduced in areas with wind driven

waves, and is enhanced in areas with

swell.


Science issue ocean surface turbulent heat fluxes

Jan. 1999 (Global)

NCEP2

ERA40

NCEP2 and ERA40 overestimate

Surface latent heat fluxes relative

To satellite-derived values


Science issue ocean surface turbulent heat fluxes

OAFLUX

Jan. 1999 (Global)

HOAPS3

GSSTF2

Largest variation among the differing

latent heat flux data sets are in regions

of high wind, with the largest latent heat

flux values


Science issue ocean surface turbulent heat fluxes

NEWS (Latent Heat Flux)

Sep. 11, 1999 (Hurricane Floyd Test)

Track of Floyd

NCEP2

Satellite (with wave spectra)

ERA40

Compared to our new product,

the reanalysis (NCEP2 and ERA40)

greatly underestimates latent heat flux

associated with the hurricane Floyd.


Science issue ocean surface turbulent heat fluxes

Difference between satellite fluxes for Hurricane Floyd, September 11, 1999:

with wave spectra minus no wave spectra


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