FN Archimer Export Format
PT J
TI Atmospheric infrasound generation by ocean waves in finite depth: unified theory and application to radiation patterns
BT 
AF De Carlo, M
   ARDHUIN, Fabrice
   Le Pichon, A
AS 1:1,2;2:2,3;3:1;
FF 1:;2:;3:;
C1 CEA, DAM, DIF, F-91297, Arpajon, France
   Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France
   Marine Physical Laboratory, Scripps Instition of Oceanography, La Jolla, CA, USA
C2 CEA, FRANCE
   CNRS, FRANCE
   SCRIPPS INST OCEANOG, USA
UM LOPS
IN WOS Cotutelle UMR
   copubli-france
   copubli-int-hors-europe
IF 1.544
TC 21
UR https://archimer.ifremer.fr/doc/00602/71378/69827.pdf
   https://archimer.ifremer.fr/doc/00602/71378/69828.pdf
LA English
DT Article
DE ;Interface waves;Wave propagation;Infrasound
AB Between 0.1 and 0.5 Hz, infrasound signals recorded in the atmosphere are dominated by ocean-generated noise called microbaroms. Microbaroms propagate through the atmosphere over thousands of kilometers due to low absorption and efficient ducting between the ground and the stratopause. Different theoretical models have been developed to characterize the source of microbaroms, all based on the second-order non-linear interaction of ocean waves. While early theories considered an infinite ocean depth and a source radiation depending on the acoustic wave elevation angle, other works have approximated the radiation pattern as a monopole, and found a considerable effect of the water depth. This paper reviews these models and extends the previous theories to the combined effects of both finite depth ocean and source directivity in both elevation and azimuth angles. It is found that the water depth has a negligible effect for the near-horizontally propagating acoustic waves that should dominate the measured microbarom records. Another important result is that the microbarom azimuthal variation can be highly directive locally, but it generally becomes isotropic when integrated over a realistic source region. 
PY 2020
PD APR
SO Geophysical Journal International
SN 0956-540X
PU Oxford University Press (OUP)
VL 221
IS 1
UT 000525947800040
BP 569
EP 585
DI 10.1093/gji/ggaa015
ID 71378
ER

EF