Steady models of Arctic shelf-basin exchange
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1998 Efforts to understand the Arctic system have recently focused on the role in local and global circulation of...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
1998
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4774 2023-05-15T14:34:13+02:00 Steady models of Arctic shelf-basin exchange Goldner, Daniel R. Arctic 1998-06 application/pdf https://hdl.handle.net/1912/4774 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/4774 doi:10.1575/1912/4774 doi:10.1575/1912/4774 Oceanic mixing Ocean-atmosphere interaction Sediments Ocean circulation Thesis 1998 ftwhoas https://doi.org/10.1575/1912/4774 2022-05-28T22:58:27Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1998 Efforts to understand the Arctic system have recently focused on the role in local and global circulation of waters from the Arctic shelf seas. In this study, steady-state exchanges between the Arctic shelves and the central basins are estimated using an inverse box model. The model accounts for data uncertainty in the estimates, and quantifies the solution uncertainty. Other features include resolution of the two-basin Arctic hydrographic structure two-way shelf-basin exchange in the surface mixed layer, the capacity for shelfbreak upwelling, and recognition that most inflows enter the Arctic via the shelves. Aggregate estimates of all fluxes across the Arctic boundary, with their uncertainties, are generated from flux estimates published between 1975 and 1997. From the aggregate estimates, mass-, heat-, and salt-conserving boundary flux estimates are derived, which imply a net flux of water from the shelves to the basins of 1.2±0.4 Sv. Due primarily to boundary flux data uncertainty, constraints of mass, heat, and salt conservation alone cannot determine how much shelf-basin exchange occurs via dense overflows, and how much via the surface mixed layer. Adding δ180 constraints, however, greatly reduces the uncertainty. Dense water flux from the shelves to the basins is necessary for maintaining steady state, but shelfbreak upwelling is not required. Proper representation of external sources feeding the shelves, rather than the basins, is important to obtain the full range of plausible steady solutions. Implications of the results for the study of Arctic change are discussed. This work was supported by National Science Foundation grant OPP-9422292 as part of the Arctic System Science ARCSS program, administered by the Office of Polar Programs. Thesis Arctic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Oceanic mixing Ocean-atmosphere interaction Sediments Ocean circulation |
spellingShingle |
Oceanic mixing Ocean-atmosphere interaction Sediments Ocean circulation Goldner, Daniel R. Steady models of Arctic shelf-basin exchange |
topic_facet |
Oceanic mixing Ocean-atmosphere interaction Sediments Ocean circulation |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1998 Efforts to understand the Arctic system have recently focused on the role in local and global circulation of waters from the Arctic shelf seas. In this study, steady-state exchanges between the Arctic shelves and the central basins are estimated using an inverse box model. The model accounts for data uncertainty in the estimates, and quantifies the solution uncertainty. Other features include resolution of the two-basin Arctic hydrographic structure two-way shelf-basin exchange in the surface mixed layer, the capacity for shelfbreak upwelling, and recognition that most inflows enter the Arctic via the shelves. Aggregate estimates of all fluxes across the Arctic boundary, with their uncertainties, are generated from flux estimates published between 1975 and 1997. From the aggregate estimates, mass-, heat-, and salt-conserving boundary flux estimates are derived, which imply a net flux of water from the shelves to the basins of 1.2±0.4 Sv. Due primarily to boundary flux data uncertainty, constraints of mass, heat, and salt conservation alone cannot determine how much shelf-basin exchange occurs via dense overflows, and how much via the surface mixed layer. Adding δ180 constraints, however, greatly reduces the uncertainty. Dense water flux from the shelves to the basins is necessary for maintaining steady state, but shelfbreak upwelling is not required. Proper representation of external sources feeding the shelves, rather than the basins, is important to obtain the full range of plausible steady solutions. Implications of the results for the study of Arctic change are discussed. This work was supported by National Science Foundation grant OPP-9422292 as part of the Arctic System Science ARCSS program, administered by the Office of Polar Programs. |
format |
Thesis |
author |
Goldner, Daniel R. |
author_facet |
Goldner, Daniel R. |
author_sort |
Goldner, Daniel R. |
title |
Steady models of Arctic shelf-basin exchange |
title_short |
Steady models of Arctic shelf-basin exchange |
title_full |
Steady models of Arctic shelf-basin exchange |
title_fullStr |
Steady models of Arctic shelf-basin exchange |
title_full_unstemmed |
Steady models of Arctic shelf-basin exchange |
title_sort |
steady models of arctic shelf-basin exchange |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
1998 |
url |
https://hdl.handle.net/1912/4774 |
op_coverage |
Arctic |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
doi:10.1575/1912/4774 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/4774 doi:10.1575/1912/4774 |
op_doi |
https://doi.org/10.1575/1912/4774 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766307301405229056 |