Snow_et_al-2016-Geophysical_Research_Letters.pdf (1.8 MB)
Controls on circulation, cross-shelf exchange, and dense water formation in an Antarctic polynya
journal contribution
posted on 2023-05-19, 01:00 authored by Snow, K, Sloyan, BM, Stephen Rintoul, Hogg, AMcC, Stephanie DownesCirculation on the Antarctic continental shelf influences cross-shelf exchange, Antarctic Bottom Water formation, and ocean heat flux to floating ice shelves. The physical processes driving the shelf circulation and its seasonal and interannual variability remain poorly understood. We use a unique time series of repeat hydrographic observations from the Adélie Land continental shelf and a box inverse model to explore the relationship between surface forcing, shelf circulation, cross-shelf exchange, and dense water formation. A wind-driven northwestward coastal current, set up by onshore Ekman transport, dominates the summer circulation. During winter, strong buoyancy loss creates dense shelf water. This dense water flows off the shelf, with a compensating on-shelf flow that is an order of magnitude larger in winter than in summer. The results demonstrate the importance of winter buoyancy loss in driving the shelf circulation and cross-shelf exchange, as well as dense water mass formation.
History
Publication title
Geophysical Research LettersVolume
43Issue
13Pagination
7089-7096ISSN
0094-8276Department/School
Institute for Marine and Antarctic StudiesPublisher
Amer Geophysical UnionPlace of publication
2000 Florida Ave Nw, Washington, USA, Dc, 20009Rights statement
© 2016. American Geophysical UnionRepository Status
- Open