Observations of the seasonality of the Antarctic microseismic signal, and its 
association to sea ice variability

Grob, M.; Maggi, A.; Stutzmann, E.

doi:10.1029/2011GL047525

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Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability

Grob, M., Maggi, A., Stutzmann, E. (2011): Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability. - Geophysical Research Letters, 38, 11.
https://doi.org/10.1029/2011GL047525

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3059897 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3059897_2

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Creators:
Grob, M.^{1, 2}, Author
Maggi, A.^{1, 2}, Author
Stutzmann, E.^{1, 2}, Author

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1External Organizations, ou_persistent22
2GEOFON, Deutsches GeoForschungsZentrum, Potsdam, , ou_2634888

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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.

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Language(s): eng - English

Dates: Finally published : 2011

Publication Status: Finally published

Pages: 6

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Identifiers: DOI: 10.1029/2011GL047525

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Title: Geophysical Research Letters

Source Genre: Journal, SCI, Scopus, ab 2023 oa

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Pages: - Volume / Issue: 38 (11) Sequence Number: - Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182