TY  - JOUR
AU  - Grob M, Maggi A.
PY  - 2011//
TI  - Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability
JO  - Geophys. Res. Lett.
SP  - L11302-
VL  - 38
IS  - 11
PB  - AGU
KW  - microseisms
KW  - sea
KW  - seismic noise
KW  - seismology
KW  - 0750 Cryosphere: Sea ice
KW  - 7299 Seismology: General or miscellaneous
KW  - 9310 Geographic Location: Antarctica
KW  -
N2  - 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.
SN  - 0094-8276
UR  - http://dx.doi.org/10.1029/2011GL047525
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=3292), last updated on Fri, 05 Jul 2024 22:03:35 +0200
ID  - GrobM2011
ER  -