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EARSeL: 2nd Workshop on Remote Sensing of the Coastal Zone Porto, Portugal, 9-11 June 2005 |
SESSION COASTAL ZONE MANAGEMENT |
Paulo B. Oliveira, A. Miguel P. Santos
IPIMAR, 1449-006 Lisboa, Portugal
pbo@ipimar.pt, amsantos@ipimar.pt
José C. da Silva
IO-FCUL, 1749-016 Lisboa, Portugal
jdasilva@fc.ul.pt
Spring infrared (IR) images from the NW Portuguese shelf are characterized by strong intra-diurnal changes, with most gradients being located in the inner shelf. In some cases, satellite-derived sea surface temperature (SST) maps are not representative of in situ temperatures obtained by conventional CTD casts some metres below the surface.
Data from IR and visible sensors from ESA and NOAA/NASA missions, complemented with in situ data from the NW Portuguese shelf, obtained in May 2002, are used to show that the presence of low salinity buoyant plumes over the shelf may lead to a decoupling between in situ and satellite-derived SST distributions. The fast response of these buoyant plumes to heat and momentum transfer with the atmosphere prompts the need to use in situ and multisensor data for a correct image interpretation and identification of the oceanographic processes underlying the observed patterns.
Last Update: 2005-03-16