FN Archimer Export Format
PT J
TI Global Microbarom Patterns: a First Confirmation of the Theory for Source and Propagation
BT 
AF De Carlo, M.
   Hupe, P.
   Le Pichon, A.
   Ceranna, L.
   Ardhuin, Fabrice
AS 1:1,2;2:3;3:1;4:3;5:4;
FF 1:;2:;3:;4:;5:;
C1 CEA, DAMDIFF‐91297 Arpajon, France
   Université de Bretagne Occidentale, Brest, France
   BGR, B4.3 Hannover, Germany
   University of Brest, CNRS, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France
C2 CEA, FRANCE
   UBO, FRANCE
   BGR, GERMANY
   CNRS, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
IF 5.576
TC 14
UR https://archimer.ifremer.fr/doc/00665/77753/79876.pdf
   https://archimer.ifremer.fr/doc/00665/77753/79877.docx
LA English
DT Article
DE ;ambient noise;infrasound;microbaroms;wave modeling
AB Microbarom signals are generated by wind‐waves at the ocean surface and propagate all around the globe through the stratosphere and ionosphere. Microbaroms dominate the coherent infrasound ambient noise measured worldwide, with a peak around 0.2 Hz. Monitoring these signals allows characterizing the source activity and probing the properties of their propagation medium, the middle atmosphere. Here we show the first quantitative validation of global microbarom modeling based on ocean wave models, a new source model and atmospheric attenuation. For evaluating these parameters’ impact, we compare the modeling results with a global reference database of microbaroms detected by the infrasound International Monitoring System over seven years. This study demonstrates that the new source model improves the prediction rate of observations by around 20 percent points against previous models. The performance is enhanced when the new model is combined with a wind‐dependent attenuation and an ocean wave model that includes coastal reflection. Plain Language Summary Microbaroms are atmospheric ambient noise below the human hearing threshold. They are generated by ocean waves and can be detected by infrasound sensors worldwide. A better understanding is important because microbaroms could hide signals of interest in the context of the Comprehensive Nuclear‐Test‐Ban Treaty, established to unveil clandestine nuclear explosions worldwide. Furthermore, as microbaroms propagate over long‐ranges through the middle atmosphere, a better knowledge of the received signals provides new insights of middle atmosphere dynamics features that are unresolved in global circulation models. In this study, we use a historical database of microbarom detections to evaluate state‐of‐the‐art models and propose a methodology to simulate microbaroms worldwide. 
PY 2021
PD FEB
SO Geophysical Research Letters
SN 0094-8276
PU American Geophysical Union (AGU)
VL 48
IS 3
UT 000620058900055
DI 10.1029/2020GL090163
ID 77753
ER

EF