On the importance of intermediate water flows for the global ocean overturning
A steady state inverse global ocean model is used together with theavailable original, historical hydrographic database to study andquantify the large-scale global ocean circulation. The model has avariable resolution grid with grid sizes as small as 2.5\degree\longitude by 2\degree\ latitude along...
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ftawi:oai:epic.awi.de:1354 2023-09-05T13:13:50+02:00 On the importance of intermediate water flows for the global ocean overturning Heras, M. de. las. Schlitzer, Reiner 1999 https://epic.awi.de/id/eprint/1354/ https://hdl.handle.net/10013/epic.11945 unknown Heras, M. d. l. and Schlitzer, R. orcid:0000-0002-3740-6499 (1999) On the importance of intermediate water flows for the global ocean overturning , Journal of geophysical research-oceans, 104, 15, 515 . hdl:10013/epic.11945 EPIC3Journal of geophysical research-oceans, 104, 15, 515, 536 p. Article isiRev 1999 ftawi 2023-08-22T19:42:36Z A steady state inverse global ocean model is used together with theavailable original, historical hydrographic database to study andquantify the large-scale global ocean circulation. The model has avariable resolution grid with grid sizes as small as 2.5\degree\longitude by 2\degree\ latitude along boundaries, straits or oversteep topography and a default resolution of 5\degree\ by 4\degree\ in``quiet'' open ocean regions. The model has 26 vertical levels with 60m resolution near the surface. The adjoint method is applied to drivethe model to the hydrographic data and to optimize horizontal flows,air-sea heat fluxes, and mixing coefficients in an iterative way.Mass, heat, and salt budgets are satisfied exactly by the model.After assimilation, both simulated temperature and salinity fields arein good agreement with observations. Sensitivity experiments showthat different circulation patterns with varying relative importanceof intermediate water versus warm water transports and varying warmwater inflow from the Indian Ocean into the Atlantic are consistentwith the hydrographic data. However, for all solutions we find thatthe water mass that dominates the compensation of North Atlantic DeepWater export is Antarctic Intermediate Water. The northward transportrates of intermediate water in the South Atlantic and South Pacific inour model solutions range between 10 and 15 Sv in each ocean and areconsiderably larger than previously published values. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Indian Pacific |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
A steady state inverse global ocean model is used together with theavailable original, historical hydrographic database to study andquantify the large-scale global ocean circulation. The model has avariable resolution grid with grid sizes as small as 2.5\degree\longitude by 2\degree\ latitude along boundaries, straits or oversteep topography and a default resolution of 5\degree\ by 4\degree\ in``quiet'' open ocean regions. The model has 26 vertical levels with 60m resolution near the surface. The adjoint method is applied to drivethe model to the hydrographic data and to optimize horizontal flows,air-sea heat fluxes, and mixing coefficients in an iterative way.Mass, heat, and salt budgets are satisfied exactly by the model.After assimilation, both simulated temperature and salinity fields arein good agreement with observations. Sensitivity experiments showthat different circulation patterns with varying relative importanceof intermediate water versus warm water transports and varying warmwater inflow from the Indian Ocean into the Atlantic are consistentwith the hydrographic data. However, for all solutions we find thatthe water mass that dominates the compensation of North Atlantic DeepWater export is Antarctic Intermediate Water. The northward transportrates of intermediate water in the South Atlantic and South Pacific inour model solutions range between 10 and 15 Sv in each ocean and areconsiderably larger than previously published values. |
format |
Article in Journal/Newspaper |
author |
Heras, M. de. las. Schlitzer, Reiner |
spellingShingle |
Heras, M. de. las. Schlitzer, Reiner On the importance of intermediate water flows for the global ocean overturning |
author_facet |
Heras, M. de. las. Schlitzer, Reiner |
author_sort |
Heras, M. de. las. |
title |
On the importance of intermediate water flows for the global ocean overturning |
title_short |
On the importance of intermediate water flows for the global ocean overturning |
title_full |
On the importance of intermediate water flows for the global ocean overturning |
title_fullStr |
On the importance of intermediate water flows for the global ocean overturning |
title_full_unstemmed |
On the importance of intermediate water flows for the global ocean overturning |
title_sort |
on the importance of intermediate water flows for the global ocean overturning |
publishDate |
1999 |
url |
https://epic.awi.de/id/eprint/1354/ https://hdl.handle.net/10013/epic.11945 |
geographic |
Antarctic Indian Pacific |
geographic_facet |
Antarctic Indian Pacific |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_source |
EPIC3Journal of geophysical research-oceans, 104, 15, 515, 536 p. |
op_relation |
Heras, M. d. l. and Schlitzer, R. orcid:0000-0002-3740-6499 (1999) On the importance of intermediate water flows for the global ocean overturning , Journal of geophysical research-oceans, 104, 15, 515 . hdl:10013/epic.11945 |
_version_ |
1776204984154587136 |