FN Archimer Export Format
PT J
TI Frequency-dependent noise sources in the North Atlantic Ocean
BT 
AF SERGEANT, Amandine
   STUTZMANN, Eleonore
   MAGGI, Alessia
   SCHIMMEL, Martin
   ARDHUIN, Fabrice
   OBREBSKI, Mathias
AS 1:1;2:1;3:2;4:3;5:4;6:4;
FF 1:;2:;3:;4:;5:PDG-ODE-LOS;6:PDG-ODE-LOS;
C1 Univ Paris Diderot, CNRS, Inst Phys Globe Paris, Sorbonne Paris Cite, F-75005 Paris, France.
   Univ Strasbourg EOST, CNRS, Inst Phys Globe Strasbourg, Strasbourg, France.
   ICTJA CSIC, Inst Earth Sci Jaume Almera, Barcelona, Spain.
   IFREMER, Lab Oceanog Spatiale, Plouzane, France.
C2 UNIV PARIS 07, FRANCE
   UNIV STRASBOURG, FRANCE
   CSIC, SPAIN
   IFREMER, FRANCE
SI AUTRE
   BREST
SE PDG-ODE-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3.054
TC 23
UR https://archimer.ifremer.fr/doc/00169/28075/26290.pdf
LA English
DT Article
DE ;noise sources;secondary microseism;North Atlantic Ocean;polarization
AB [1] Secondary microseisms are the most energetic waves in the noise spectra between 3 and 10 s. They are generated by ocean wave interactions and are predominantly Rayleigh waves. We study the associated noise sources in the North Atlantic Ocean by coupling noise polarization analysis and source mapping using an ocean wave model that takes into account coastal reflections. From the Rayleigh wave polarization analysis, we retrieve the back azimuth to the noise sources in the time-frequency domain. Noise source modeling enables us to locate the associated generation areas at different times and frequencies. We analyze the distribution of secondary microseism sources in the North Atlantic Ocean using 20 broadband stations located in the Arctic and around the ocean. To model the noise sources we adjust empirically the ocean wave coastal reflection coefficient as a function of frequency. We find that coastal reflections must be taken into account for accurately modeling 7–10 s noise sources. These reflections can be neglected in the noise modeling for periods shorter than 7 s. We find a strong variability of back azimuths and source locations as a function of frequency. This variability is largely related to the local bathymetry. One direct cause of the time-dependent and frequency-dependent noise sources is the presence of sea-ice that affects the amplitude and polarization of microseisms at stations in the Arctic only at periods shorter than 4 s.
PY 2013
PD DEC
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU Amer Geophysical Union
VL 14
IS 12
UT 000330833500021
BP 5341
EP 5353
DI 10.1002/2013GC004905
ID 28075
ER

EF