New Release of Oceanic Scatterometer and Radiometer Turbulent Air-Sea Fluxes
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1 New Release of Oceanic Scatterometer and Radiometer Turbulent Air-Sea Fluxes A. Bentamy IFREMER. France S. Grodsky Univ. of Maryland. USA K. Katsaros NOAA. USA. A. Mestas-Nuñez Univ Corpus Christi. USA. J. Hanafin Univ de Bretagne Ouest (LPO/UBO). France. B. Blanke. Univ de Bretagne Ouest (LPO/UBO). France. F. Desbiolles Univ de Bretagne Ouest (LPO/UBO). France.
2 Background 17 years of Satellite Fluxes over Global Ocean (Weekly / Monthly / 1 x1 ) Latent Heat Flux (Grodsky et al, 2009)
3 ENSO Signal in LHF (Mestas et al, 2013) Definition: El Niño and La Niña periods occur when the smoothed (5-month running) Niño-3 SSTAs remain warmer than 0.5 C or colder than -0.5 C for at least six consecutive months (Trenberth,1997) SSTA LHFA 3 El Niño (red) 3 La Niña (blue) ENSO events calculated using Niño-3 index (Trenberth 1997)
4 Turbulent Flux Accuracy Requirements Grodsky S. A., A. Bentamy, J. A. Carton, R. T. Pinker, 2009: Intraseasonal latent heat flux based on satellite observations Journal of Climate 2009 early online release, posted April 2009 DOI: /2009JCLI Santorelli A., R. T. Pinker, A. Bentamy, K. B. Katsaros, W. M. Drennan, A. M. Mestas-Nuñez, J. A. Carton, 2011 : Differences between two estimates of air-sea turbulent heat fluxes over the Atlantic Ocean. JGR., VOL. 116, C09028, 19 PP., doi: /2010jc Improvements of: Specific air humidity Surface wind speed Air Temperature Improvement of spatial and temporal resolutions Porsec2012 Meeting 5-9 November Cochin India
5 New Release of Turbulent Fluxes (Bentamy et al, 2013) Main Changes Wind : QuikScat retrievals (V3 (Fore et al, 2011)) including (Bentamy et al, 2012) results Specific Air Humidity : qa 10 = f 1 (Tb 19V ) +f 2 (Tb 19H ) + f 3 (Tb 22V ) + f 4 (Tb 37V ) + g(sst) + h( T) Tb are from SSM/I F11 F15 Air Temperature: Corrected Era Interim Sea Surface Temperature HR SST V2 (Reynolds et al, 2007) Objective Method (Bentamy et al, 2011) Calculations of Global Daily and Monthly 0.25 x0.25 Flux Analyses. Porsec2012 Meeting 5-9 November Cochin India
6 Daily Fluxes from Remotely Sensed Data
7 LHF ICOADS (W/m²) LHF Sat (W/m²) Assessment of the Turbulent Flux Accuracy Spatial and temporal Collocation of Daily Estimates In-Situ / Satellite In-Situ / ICOADS(Berry et al, 2011)
8 Assessment of the Turbulent Flux Accuracy Spatial and temporal Collocation of Daily Estimates Outliers are excluded Brunke et al, 2011 LHF (W/m²) SHF(W/m²) Stress(10-3 N/m²) Bias SDE Bias SDE Bias SDE Ifremer ERA-I CFSR HOAPS OAFLUX
9 ICOADS / Satellite Comparisons Impact of Basic Variables dlhf = ( Lhf/ U)dU + ( Lhf/ Ce)dCE + ( Lhf/ Qa)dQa + ( Lhf/ Qs)dQs = dlhf U + dlhf Ce + dlhf Qa + dlhf Qs ( Lv U (Qs-Qa Lhf = du = U nocs U satellite; dce = Ce nocs Ce satellite ; dqa = Qa nocs Qa satellite ; dqs = Qs nocs Qs satellite
10 ICOADS / Satellite Comparisons Impact of Basic Variables dshf = ( Lhf/ U)dU + ( Lhf/ Ch)dCH + ( Lhf/ Ta)dTa + ( Lhf/ Sst)dSst = dlhf U + dlhf Ch + dlhf Ta + dlhf Sst ( CP U (Sst-Ta Shf = du = U buoy U satellite; dch = Ch buoy Ch satellite ; dta = Ta buoy Ta satellite ; dsst = Qsst buoy Qsst satellite
11 LHF Seasonal Patterns
12 SHF Seasonal Patterns
13 Summary / Perspectives Flux Improvements are achieved Better Results at global scale Good Agreement with In-situ Estimates Long Time Series: Further Validations Spatial and Temporal Resolutions Issues Forcing Impact : exp. Upwelling systems Extended Time Period:
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