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| Titel |
Spatial-temporal variation of heat flux in central Amundsen Sea |
| VerfasserIn |
Tae Wan Kim, Ho Kyung Ha, Anna Wåhlin, Jae Hak Lee, Sang Hoon Lee |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250077933
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| Zusammenfassung |
| Recently, the ice sheet in the coast around the Amundsen Sea has been widespread thinning
due to the effect of warm circumpolar deep water (CDW) intrusions into the continental
shelf. To quantitatively estimate the heat transport of CDW into the Amundsen
Sea, we used 1-year mooring data and CTD and LADCP data measured by the
icebreaker Araon in February 2012. In the calculation result of bottom heat transport, the
time-averaged barotropic heat transport was relatively small, compared to the baroclinic heat
transport during whole mooring period. The baroclinic heat transport showed the
seasonal variation due to variation of heat content near the bottom. We found that the
heat flux of seawater depend on the along-channel barotropic velocity. Also, the
heat content of seawater showed a good correlation with the variation of sea ice
concentration in Amundsen Sea. During austral summer, the freshening of surface water by
sea ice melting contributed to the increase in along-channel barotropic transport
to the south, whereas during austral winter, along-channel barotropic transport
decreased due to increase of the sea surface salinity produced by sea ice growth. The
observed baroclinic heat transport from CTD and LADCP across channel section
(area: 103 km2) was 7.5 TW in central Amundsen Sea in February 2012. In front of
Dotson Ice Shelf (area: 34 km2), the observed baroclinic heat transport was 0.6 TW. |
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