- (LOS - IFREMER)
Satellite altimeters are unique to provide robust estimates of the sea states generated by tropical cyclones (Young, 2003; Quilfen et al., 2006, 2010) and can help to quantify changes in sea surface height in storm-affected regions during the months following tropical cyclones (Jansen et al., 2010; Haney et al., 2012; Mei et al., 2013; Sriver, 2013). Changes in sea surface height are closely linked to changes in ocean heat content, which enable direct estimates of the vertically integrated changes in ocean temperatures caused by tropical cyclones.
The first objective of the project is to advance our knowledge of sea state conditions using the current altimeter datasets conjointly with numerical and analytical models, and to investigate how these waves participate to the ocean mixing and cold wake formation. With the actual satellite constellation and Argo floats deployment, coverage is far from complete but it is better than ever and will keep increasing.
The second objective is to investigate the re-stratification phase. What is of primary interest is what processes control the recovery of the wake toward pre-cyclone conditions, and how the balance and rates of these processes change depending on the parameters of the wake: buoyancy gradient, depth and width. The purpose here is to evaluate the processes of re-stratification of the cold wake, to characterize how dependent they are on pre-cyclonic ocean conditions and finally to quantify the ocean heat uptake by TCs. These objectives can only be achieved by using all the observations available conjointly with the understanding of processes that modeling experiments can offer.