Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice Shelf
The Ross Ice Shelf (RIS) is host to a broadband, multimode seismic wavefield that is excited in response to atmospheric, oceanic and solid Earth source processes. A 34-station broadband seismographic network installed on the RIS from late 2014 through early 2017 produced continuous vibrational obser...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2019-12-01
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| Series: | Journal of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0022143019000649/type/journal_article |
| _version_ | 1811155820854902784 |
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| author | Michael G. Baker Richard C. Aster Robert E. Anthony Julien Chaput Douglas A. Wiens Andrew Nyblade Peter D. Bromirski Peter Gerstoft Ralph A. Stephen |
| author_facet | Michael G. Baker Richard C. Aster Robert E. Anthony Julien Chaput Douglas A. Wiens Andrew Nyblade Peter D. Bromirski Peter Gerstoft Ralph A. Stephen |
| author_sort | Michael G. Baker |
| collection | DOAJ |
| description | The Ross Ice Shelf (RIS) is host to a broadband, multimode seismic wavefield that is excited in response to atmospheric, oceanic and solid Earth source processes. A 34-station broadband seismographic network installed on the RIS from late 2014 through early 2017 produced continuous vibrational observations of Earth's largest ice shelf at both floating and grounded locations. We characterize temporal and spatial variations in broadband ambient wavefield power, with a focus on period bands associated with primary (10–20 s) and secondary (5–10 s) microseism signals, and an oceanic source process near the ice front (0.4–4.0 s). Horizontal component signals on floating stations overwhelmingly reflect oceanic excitations year-round due to near-complete isolation from solid Earth shear waves. The spectrum at all periods is shown to be strongly modulated by the concentration of sea ice near the ice shelf front. Contiguous and extensive sea ice damps ocean wave coupling sufficiently so that wintertime background levels can approach or surpass those of land-sited stations in Antarctica. |
| first_indexed | 2024-04-10T04:41:06Z |
| format | Article |
| id | doaj.art-c19e068fd6c146ebb36f9fff0dfd8585 |
| institution | Directory Open Access Journal |
| issn | 0022-1430 1727-5652 |
| language | English |
| last_indexed | 2024-04-10T04:41:06Z |
| publishDate | 2019-12-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Journal of Glaciology |
| spelling | doaj.art-c19e068fd6c146ebb36f9fff0dfd85852023-03-09T12:40:49ZengCambridge University PressJournal of Glaciology0022-14301727-56522019-12-016591292510.1017/jog.2019.64Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice ShelfMichael G. Baker0https://orcid.org/0000-0002-4580-6820Richard C. Aster1Robert E. Anthony2Julien Chaput3Douglas A. Wiens4Andrew Nyblade5Peter D. Bromirski6Peter Gerstoft7Ralph A. Stephen8Department of Geosciences, Colorado State University, Fort Collins, CO, USADepartment of Geosciences, Colorado State University, Fort Collins, CO, USADepartment of Geosciences, Colorado State University, Fort Collins, CO, USADepartment of Geological Sciences, University of Texas at El Paso, El Paso, TX, USADepartment of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, MO, USADepartment of Geosciences, Pennsylvania State University, University Park, PA, USAScripps Institute of Oceanography, University of California, San Diego, CA, USAScripps Institute of Oceanography, University of California, San Diego, CA, USAWoods Hole Oceanographic Institution, Woods Hole, MA, USAThe Ross Ice Shelf (RIS) is host to a broadband, multimode seismic wavefield that is excited in response to atmospheric, oceanic and solid Earth source processes. A 34-station broadband seismographic network installed on the RIS from late 2014 through early 2017 produced continuous vibrational observations of Earth's largest ice shelf at both floating and grounded locations. We characterize temporal and spatial variations in broadband ambient wavefield power, with a focus on period bands associated with primary (10–20 s) and secondary (5–10 s) microseism signals, and an oceanic source process near the ice front (0.4–4.0 s). Horizontal component signals on floating stations overwhelmingly reflect oceanic excitations year-round due to near-complete isolation from solid Earth shear waves. The spectrum at all periods is shown to be strongly modulated by the concentration of sea ice near the ice shelf front. Contiguous and extensive sea ice damps ocean wave coupling sufficiently so that wintertime background levels can approach or surpass those of land-sited stations in Antarctica.https://www.cambridge.org/core/product/identifier/S0022143019000649/type/journal_articleAntarctic glaciologyice shelvesseismology |
| spellingShingle | Michael G. Baker Richard C. Aster Robert E. Anthony Julien Chaput Douglas A. Wiens Andrew Nyblade Peter D. Bromirski Peter Gerstoft Ralph A. Stephen Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice Shelf Journal of Glaciology Antarctic glaciology ice shelves seismology |
| title | Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice Shelf |
| title_full | Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice Shelf |
| title_fullStr | Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice Shelf |
| title_full_unstemmed | Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice Shelf |
| title_short | Seasonal and spatial variations in the ocean-coupled ambient wavefield of the Ross Ice Shelf |
| title_sort | seasonal and spatial variations in the ocean coupled ambient wavefield of the ross ice shelf |
| topic | Antarctic glaciology ice shelves seismology |
| url | https://www.cambridge.org/core/product/identifier/S0022143019000649/type/journal_article |
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