FN Archimer Export Format
PT J
TI Analysis of surface wind and roughness length evolution with fetch using a combination of airborne lidar and radar measurements
BT 
AF FLAMANT, C
   PELON, J
   HAUSER, D
   QUENTIN, C
   DRENNAN, WM
   GOHIN, Francis
   CHAPRON, Bertrand
   GOURRION, Jerome
AS 1:;2:;3:;4:;5:;6:;7:;8:;
FF 1:;2:;3:;4:;5:;6:PDG-DEL-EC-PP;7:PDG-DRO-DOPS-LOS;8:PDG-DRO-DOPS-LOS;
C1 Univ Paris 06, Serv Aeron, IPSL, F-75252 Paris, France.
   Univ St Quentin Versailles, Ctr Etud Environm Planetaires, IPSL, F-78140 Velizy Villacoublay, France.
   Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA.
   Inst Francais Rech Exploitat Mer, Dept Oceanog Spatiale, Brest, France.
C2 UNIV PARIS 06, FRANCE
   UNIV ST QUENTIN VERSAILLES, FRANCE
   UNIV MIAMI, USA
   IFREMER, FRANCE
SI BREST
SE PDG-DEL-EC-PP
   PDG-DRO-DOPS-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 2.992
TC 14
UR https://archimer.ifremer.fr/doc/00000/10174/9582.pdf
LA English
DT Article
AB [1] Acombination of surface wind speed (SWS) and sea state variables, derived from quasi-simultaneous airborne lidar and radar measurements, made in the framework of the Flux, Etat de mer et Teledetection en Condition de fetcH variable (FETCH) experiment, is used to analyze the evolution of surface roughness length, neutral drag coefficient, and friction velocity coefficient with fetch in the first hundred kilometers offshore over the Gulf of Lion, Western Mediterranean. The study focuses on the Tramontane/ Mistral event documented in the afternoon of 24 March 1998. Particular attention is given to SWS derived from nadir lidar measurements. The SWS retrieval methodology developed and validated for open ocean conditions by Flamant et al. [1998] has been modified to account for the specificity of the coastal Mediterranean environment (complex mixture of continental and maritime aerosol; turbid, productive waters). The lidar-derived SWS evolution with fetch observed on 24 March 1998 in the afternoon was validated against in situ and remote sensing measurements made from a buoy, a ship, as well as from the spaceborne altimeter TOPEX. The spatial variability in SWS observed with the airborne lidar was controlled by the structure of the wake regions downstream of the Massif Central and the Maritime Alps, delimiting the longitudinal extension of the Mistral, and was influenced by swell resulting from the action of a steady northeasterly flow coming from the Ligurian Sea in connection with intense Alpine lee cyclogenesis. These findings were supported by the other measurements. It is further shown that, based on a formulation of the dimensionless roughness dependance with wave age, airborne lidar and radar measurements can be combined to provide insight into the evolution with fetch of roughness length, neutral drag coefficient, and friction velocity. Four distinct sea state regimes over a distance of 100 km could be identified from the remotely sensed variables obtained with this novel approach in connection with atmospheric forcing. The dependance of lidar/radar derived drag coefficient with lidar-derived SWS for the four regimes was found to be remarkably consistent with the relationship derived from the buoy measurements. Finally, lidar/radar derived friction velocities were found in good agreement with the buoy and in situ aircraft measurements.
PY 2003
PD FEB
SO Journal Of Geophysical Research Oceans
SN 0148-0227
PU Amer Geophysical Union
VL 108
IS C3
UT 000181939300002
DI 10.1029/2002JC001405
ID 10174
ER

EF