Nicolas Reul1, Joseph Tenerelli2

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Presentation transcript:

Observations of Ocean response to Hurricane Igor: A Salty Tropical Cyclone Wake observed from Space Nicolas Reul1, Joseph Tenerelli2 1IFREMER, Laboratoire d'Océanographie Spatiale, France 2Collect Localisation Satellite, France

Freshwater Plume waters warmer by >1°C than open ocean Waters during the hurricane season

Freshwater plume Barrier-layer effects Amazon and Orinoco River Plumes and NBC Rings: Bystanders or Participants in Hurricane Events? A. FFIELD, J CLIM 2007 Warm anomaly, NBC rings & Freshwater plume Barrier-layer effects

Category 4 Hurricane Igor in September 2010 09/11 09/13 09/15 09/17 09/19

Pre-storm conditions Tropical Cyclone Heat Potential (TCHP) derived by AOML 10 Sep TMI-AMSRE SST 10 Sep [kJ cm2] Amazon Plume extent from SMOS data 1 week before Igor (SSS=35.5)

Storm Forward Translation Speed Igor slowed down as it travelled across the Amazon River Plume: Vt=3-5 m/s

Atmospheric forcing Max Wind Speed Wind Power Index Radius at 34 knts Proxy for wind energy input to the ocean (Vincent et al, JGR 2012) GFDL model data =>good agreement with obs during Igor (Reul et al, JGR 2012) =>Strongest atmospheric forcing over the Amazon River Plume

SMOS SSS 1 week After IGOR SMOS SSS 1 week Before IGOR Surface area~ 89000 km2> Lake Superior, the world largest freshwater lake: a transfer of 1 GTo of Salt in 5 days SMOS SSS 1 week After IGOR SMOS SSS 1 week Before IGOR Figure 2: Two SMOS microwave satellite-derived SSS composite images of the Amazon plume region revealing the SSS conditions (a) before and (b) after the passing of Hurricane Igor, a category 5 hurricane that attained wind speeds of 136 knots in September 2010. Color-coded circles mark the successive hurricane eye positions and maximum 1-min sustained wind speed values in knots. Seven days of data centered on (a) 10 Sep 2010 and (b) 22 Sep 2010 have been averaged to construct the SSS images, which are smoothed by a 1° x 1° block average.

Surface wakes of Igor: SST, SSS,Density, Color

Sea level Change from Altimetry (Jason 1 & 2) ~25 cm , maximimum trough along track, where Wpi was max

Validation with in situ In situ sampling of igor high wind wake by ARGO floats

Skin Satellite estimates of the ocean surface response to IGOR versus ~5 m depth Argo measurements Salinity Temperature Density Rmse= 0.37 (SSS) , 0.4°C (SST) and 0.34 kg.m-3 (density)

Thick BL>20m=> cooling inhibition by salt-driven stratification In the Plume

Summary New Sea Surface Salinity products from Space can be used to improve our understanding of processes involved in oceanic response to TC First Evidence of SSS changes in the wake of a TC from Spaceborne data In combination with SST=> density change In combination with altimetry (respective signatures of barotropic & barocilinc effects) Salt-driven stratification in Amazon plume reduces cooling by the wind induced mixing=> potential for TC intensification SMOS SSS products can be used to better characterize the ocean heat potential variability in Barrier Layer areas => improve TC intensification forecasts