Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica
Antarctic field seasons recorded the arrival of 93 distantly sourced ocean swell events displaying frequency dispersion characteristic of surface gravity waves propagating on deep water. Comparison of swell event dispersion with the NOAA Wave Watch III (NWW3) ocean wave model analysis reveals that 8...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.493.9312 2023-05-15T13:44:18+02:00 Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica L. M. Cathles Iv Emile A. Okal Douglas R. Macayeal The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9312 http://www.earth.northwestern.edu/individ/emile/PDF/EAO199.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9312 http://www.earth.northwestern.edu/individ/emile/PDF/EAO199.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.earth.northwestern.edu/individ/emile/PDF/EAO199.pdf text ftciteseerx 2016-01-08T08:40:14Z Antarctic field seasons recorded the arrival of 93 distantly sourced ocean swell events displaying frequency dispersion characteristic of surface gravity waves propagating on deep water. Comparison of swell event dispersion with the NOAA Wave Watch III (NWW3) ocean wave model analysis reveals that 83 of these events were linked to specific storms located in the Pacific, Southern, and Indian oceans. Nearly all major storms in the NWW3 analysis of the Pacific Ocean were linked to signals observed at the Nascent site during the period of seismometer operation. Swell-induced motion of the Ross Ice Shelf is found to increase by several orders of magnitude over the time period that sea ice surrounding Antarctica decreases from its maximum extent (October) to its minimum extent (February). The amplitude of vertical vibration of the ice shelf in the frequency band between 0.025 and 0.14 Hz varies between tens of micrometers to millimeters as sea ice decays to its minimum seasonal extent. This suggests that climate influence on sea ice extent may indirectly modulate swell energy incident on the calving margins of the Antarctic Ice Sheet. The largest swell signals observed on the Ross Ice Shelf come from storms in the tropical Pacific and Gulf of Alaska. These remote events emphasize how the iceberg calving margin of Antarctica is connected to environmental conditions well beyond Antarctica. Text Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Iceberg* Ross Ice Shelf Sea ice Alaska Unknown Antarctic Gulf of Alaska Indian Pacific Ross Ice Shelf The Antarctic |
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English |
description |
Antarctic field seasons recorded the arrival of 93 distantly sourced ocean swell events displaying frequency dispersion characteristic of surface gravity waves propagating on deep water. Comparison of swell event dispersion with the NOAA Wave Watch III (NWW3) ocean wave model analysis reveals that 83 of these events were linked to specific storms located in the Pacific, Southern, and Indian oceans. Nearly all major storms in the NWW3 analysis of the Pacific Ocean were linked to signals observed at the Nascent site during the period of seismometer operation. Swell-induced motion of the Ross Ice Shelf is found to increase by several orders of magnitude over the time period that sea ice surrounding Antarctica decreases from its maximum extent (October) to its minimum extent (February). The amplitude of vertical vibration of the ice shelf in the frequency band between 0.025 and 0.14 Hz varies between tens of micrometers to millimeters as sea ice decays to its minimum seasonal extent. This suggests that climate influence on sea ice extent may indirectly modulate swell energy incident on the calving margins of the Antarctic Ice Sheet. The largest swell signals observed on the Ross Ice Shelf come from storms in the tropical Pacific and Gulf of Alaska. These remote events emphasize how the iceberg calving margin of Antarctica is connected to environmental conditions well beyond Antarctica. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
L. M. Cathles Iv Emile A. Okal Douglas R. Macayeal |
spellingShingle |
L. M. Cathles Iv Emile A. Okal Douglas R. Macayeal Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica |
author_facet |
L. M. Cathles Iv Emile A. Okal Douglas R. Macayeal |
author_sort |
L. M. Cathles Iv |
title |
Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica |
title_short |
Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica |
title_full |
Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica |
title_fullStr |
Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica |
title_full_unstemmed |
Seismic observations of sea swell on the floating Ross Ice Shelf, Antarctica |
title_sort |
seismic observations of sea swell on the floating ross ice shelf, antarctica |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9312 http://www.earth.northwestern.edu/individ/emile/PDF/EAO199.pdf |
geographic |
Antarctic Gulf of Alaska Indian Pacific Ross Ice Shelf The Antarctic |
geographic_facet |
Antarctic Gulf of Alaska Indian Pacific Ross Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Iceberg* Ross Ice Shelf Sea ice Alaska |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Iceberg* Ross Ice Shelf Sea ice Alaska |
op_source |
http://www.earth.northwestern.edu/individ/emile/PDF/EAO199.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9312 http://www.earth.northwestern.edu/individ/emile/PDF/EAO199.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766199921748213760 |