Mean Significant Wave Height, Amplitude of the its Annual Cycle and Mean Wave Energy Flux from Jason-1 and -2 (2001-2016)
|Temporal extent||2001-07-01 -2016-01-31|
|Author(s)||Passaro Marcello1, Schwatke Christian1, Dettmering Denise1, Seitz Florian1|
|Affiliation(s)||1 : Deutsches Geodätisches Forschungsinstitut der Technischen Universität München|
|Note||The global data is provided in .txt format with the following structure: 1st Coloumn: Latitude (degrees from -90 to 90) 2nd Coloumn: Longitude (degrees from -180 to 180) 3rd Coloumn: Physical Variable The 3rd Coloumn corresponds to: 1) Mean Significant Wave Height in meters 2) Amplitude of the Annual Cycle of the Significant Wave Height in meters 3) Mean Wave Energy Flux in kW/m (kiloWatt over meters) Each location corresponds to a latitude-longitude location of the nominal track of the Jason Satellite Altimetry missions at a frequency of 1-Hz, i.e. a track spacing of roughly 7 km.|
|Keyword(s)||Wave Height, Wave Energy, Wave Power, Oceanography, Satellite Altimetry, Coast|
This dataset contains the results of the accepted Nature Communications manuscript entitled "Global coastal attenuation of wind-waves observed with radar altimetry", with the following abstract:
Coastal studies of wave climate and evaluations of wave energy resources are mainly regional and based on the use of computationally very expensive models or a network of in-situ data. Considering the significant wave height, satellite radar altimetry provides an established global and relatively long-term source, whose coastal data are nevertheless typically flagged as unreliable within 30 km of the coast. This study exploits the reprocessing of the radar altimetry signals with a dedicated fitting algorithm to retrieve several years of significant wave height records in the coastal zone. We show significant variations in annual cycle amplitudes and mean state in the last 30 km from the coastline compared to offshore, in areas which were up to now not observable with standard radar altimetry. Consequently, a decrease of the average wave energy flux is observed. Globally, we found that the mean significant wave height at 3 km off the coast is on average 22% smaller than offshore, the amplitude of the annual cycle is reduced on average by 14% and the mean energy flux loses 38% of its offshore value.