Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability
Identifieur interne : 000162 ( France/Analysis ); précédent : 000161; suivant : 000163Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability
Auteurs : M. Grob [France, Canada] ; A. Maggi [France] ; E. Stutzmann [France]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2011-06.
Abstract
Seismic noise spectra at all seismic stations display two peaks in the 1–20 s period band, called primary and secondary microseisms. They are caused by the coupling of ocean waves into Rayleigh waves. At most locations, microseismic power is greater during local winter (when nearby oceans are stormier) than local summer. This tendency is reversed for stations in Antarctica, where growth of local winter sea ice seems to impede microseism generation in near coastal areas. A decade of continuous data from coastal seismic stations in Antarctica show systematic seasonality in microseismic signal levels, and demonstrate associations with both broad‐scale and local sea‐ice conditions. Primary microseisms are known to be generated at the coast and the modulation that we observe can be associated with sea‐ice variations both in the vicinity of the station and along other Antarctic coasts. The similar modulation of short‐period secondary microseisms corroborates their mostly near‐coastal origin, while the continued presence of long‐period secondary microseisms suggests more distant source regions. These observations could be used to extend the monitoring of climate variability prior to the availability of satellite‐derived climate indicators.
Url:
DOI: 10.1029/2011GL047525
Affiliations:
- Canada, France
- Alsace (région administrative), Grand Est, Île-de-France
- Paris, Strasbourg
- Université de Strasbourg
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ISTEX:380D4ED35E42E39AF43E91FA1AF126002D621B26Le document en format XML
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Lett.</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2011-06">2011-06</date><biblScope unit="volume">38</biblScope><biblScope unit="issue">11</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0094-8276</idno></series><idno type="istex">380D4ED35E42E39AF43E91FA1AF126002D621B26</idno><idno type="DOI">10.1029/2011GL047525</idno><idno type="ArticleID">2011GL047525</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Seismic noise spectra at all seismic stations display two peaks in the 1–20 s period band, called primary and secondary microseisms. They are caused by the coupling of ocean waves into Rayleigh waves. At most locations, microseismic power is greater during local winter (when nearby oceans are stormier) than local summer. This tendency is reversed for stations in Antarctica, where growth of local winter sea ice seems to impede microseism generation in near coastal areas. A decade of continuous data from coastal seismic stations in Antarctica show systematic seasonality in microseismic signal levels, and demonstrate associations with both broad‐scale and local sea‐ice conditions. Primary microseisms are known to be generated at the coast and the modulation that we observe can be associated with sea‐ice variations both in the vicinity of the station and along other Antarctic coasts. The similar modulation of short‐period secondary microseisms corroborates their mostly near‐coastal origin, while the continued presence of long‐period secondary microseisms suggests more distant source regions. 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