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.

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Presentation transcript:

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 ; apply data sets Year 4 & 5: evaluate new flux data set, reprocess as needed, continue regional ocean applications, evaluate U.S. CMEP models

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. NEWS (Latent Heat Flux) Jan (Global Test) Data sources SST (NOAA) Wind (NCDC) Qa (Jackson et al) Ta (NCEP2)

NCEP2 ERA40 Jan (Global) NCEP2 and ERA40 overestimate Surface latent heat fluxes relative To satellite-derived values

OAFLUX HOAPS3 GSSTF2 Jan (Global) Largest variation among the differing latent heat flux data sets are in regions of high wind, with the largest latent heat flux values

NCEP2 ERA40 NEWS (Latent Heat Flux) Sep. 11, 1999 (Hurricane Floyd Test) Satellite (with wave spectra) Compared to our new product, the reanalysis (NCEP2 and ERA40) greatly underestimates latent heat flux associated with the hurricane Floyd. Track of Floyd

Difference between satellite fluxes for Hurricane Floyd, September 11, 1999: with wave spectra minus no wave spectra