Physical Oceanography in the tropical Atlantic oxygen minimum zone
The replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off northwest Africa is accomplished by oxygen transport across and along density surfaces, i.e. diapycnal and isopycnal oxygen supply. Here the diapycnal oxygen supply is investigated using a large observational set of...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.819311 2023-05-15T13:42:11+02:00 Physical Oceanography in the tropical Atlantic oxygen minimum zone Fischer, Tim Banyte, Donata Brandt, Peter Dengler, Marcus Krahmann, Gerd Tanhua, Toste Visbeck, Martin MEDIAN LATITUDE: 9.975387 * MEDIAN LONGITUDE: -21.866448 * SOUTH-BOUND LATITUDE: -5.000000 * WEST-BOUND LONGITUDE: -31.089800 * NORTH-BOUND LATITUDE: 33.219440 * EAST-BOUND LONGITUDE: 28.009500 * DATE/TIME START: 2008-02-05T15:16:00 * DATE/TIME END: 2010-11-12T11:03:00 2013-09-13 application/zip, 18 datasets https://doi.pangaea.de/10.1594/PANGAEA.819311 https://doi.org/10.1594/PANGAEA.819311 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.819311 https://doi.org/10.1594/PANGAEA.819311 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Fischer, Tim; Banyte, Donata; Brandt, Peter; Dengler, Marcus; Krahmann, Gerd; Tanhua, Toste; Visbeck, Martin (2013): Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone. Biogeosciences, 10(7), 5079-5093, https://doi.org/10.5194/bg-10-5079-2013 Climate - Biogeochemistry Interactions in the Tropical Ocean SFB754 Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.819311 https://doi.org/10.5194/bg-10-5079-2013 2023-01-20T07:33:08Z The replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off northwest Africa is accomplished by oxygen transport across and along density surfaces, i.e. diapycnal and isopycnal oxygen supply. Here the diapycnal oxygen supply is investigated using a large observational set of oxygen profiles and diapycnal mixing data from years 2008 to 2010. Diapycnal mixing is inferred from different sources: (i) a large-scale tracer release experiment, (ii) microstructure profiles, and (iii) shipboard?acoustic current measurements plus density profiles. From these measurements, the average diapycnal diffusivity in the studied depth interval from 150 to 500m is estimated to be 1×10**-5 m2 s**-1, with lower and upper 95% confidence limits of 0.8×10**-5 m2 s**-1 and 1.4×10**-5 m2 s**-1. Diapycnal diffusivity in this depth range is predominantly caused by turbulence, and shows no significant vertical gradient. Diapycnal mixing is found to contribute substantially to the oxygen supply of the OMZ. Within the OMZ core, 1.5 µmol kg**-1 yr**-1 of oxygen is supplied via diapycnal mixing, contributing about one-third of the total demand. This oxygen which is supplied via diapycnal mixing originates from oxygen that has been laterally supplied within the upper CentralWater layer above the OMZ, and within the Antarctic Intermediate Water layer below the OMZ. Due to the existence of a separate shallow oxygen minimum at about 100m depth throughout most of the study area, there is no net vertical oxygen flux from the surface layer into the Central Water layer. Thus all oxygen supply of the OMZ is associated with remote pathways. Dataset Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic ENVELOPE(-31.089800,28.009500,33.219440,-5.000000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Climate - Biogeochemistry Interactions in the Tropical Ocean SFB754 |
spellingShingle |
Climate - Biogeochemistry Interactions in the Tropical Ocean SFB754 Fischer, Tim Banyte, Donata Brandt, Peter Dengler, Marcus Krahmann, Gerd Tanhua, Toste Visbeck, Martin Physical Oceanography in the tropical Atlantic oxygen minimum zone |
topic_facet |
Climate - Biogeochemistry Interactions in the Tropical Ocean SFB754 |
description |
The replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off northwest Africa is accomplished by oxygen transport across and along density surfaces, i.e. diapycnal and isopycnal oxygen supply. Here the diapycnal oxygen supply is investigated using a large observational set of oxygen profiles and diapycnal mixing data from years 2008 to 2010. Diapycnal mixing is inferred from different sources: (i) a large-scale tracer release experiment, (ii) microstructure profiles, and (iii) shipboard?acoustic current measurements plus density profiles. From these measurements, the average diapycnal diffusivity in the studied depth interval from 150 to 500m is estimated to be 1×10**-5 m2 s**-1, with lower and upper 95% confidence limits of 0.8×10**-5 m2 s**-1 and 1.4×10**-5 m2 s**-1. Diapycnal diffusivity in this depth range is predominantly caused by turbulence, and shows no significant vertical gradient. Diapycnal mixing is found to contribute substantially to the oxygen supply of the OMZ. Within the OMZ core, 1.5 µmol kg**-1 yr**-1 of oxygen is supplied via diapycnal mixing, contributing about one-third of the total demand. This oxygen which is supplied via diapycnal mixing originates from oxygen that has been laterally supplied within the upper CentralWater layer above the OMZ, and within the Antarctic Intermediate Water layer below the OMZ. Due to the existence of a separate shallow oxygen minimum at about 100m depth throughout most of the study area, there is no net vertical oxygen flux from the surface layer into the Central Water layer. Thus all oxygen supply of the OMZ is associated with remote pathways. |
format |
Dataset |
author |
Fischer, Tim Banyte, Donata Brandt, Peter Dengler, Marcus Krahmann, Gerd Tanhua, Toste Visbeck, Martin |
author_facet |
Fischer, Tim Banyte, Donata Brandt, Peter Dengler, Marcus Krahmann, Gerd Tanhua, Toste Visbeck, Martin |
author_sort |
Fischer, Tim |
title |
Physical Oceanography in the tropical Atlantic oxygen minimum zone |
title_short |
Physical Oceanography in the tropical Atlantic oxygen minimum zone |
title_full |
Physical Oceanography in the tropical Atlantic oxygen minimum zone |
title_fullStr |
Physical Oceanography in the tropical Atlantic oxygen minimum zone |
title_full_unstemmed |
Physical Oceanography in the tropical Atlantic oxygen minimum zone |
title_sort |
physical oceanography in the tropical atlantic oxygen minimum zone |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.819311 https://doi.org/10.1594/PANGAEA.819311 |
op_coverage |
MEDIAN LATITUDE: 9.975387 * MEDIAN LONGITUDE: -21.866448 * SOUTH-BOUND LATITUDE: -5.000000 * WEST-BOUND LONGITUDE: -31.089800 * NORTH-BOUND LATITUDE: 33.219440 * EAST-BOUND LONGITUDE: 28.009500 * DATE/TIME START: 2008-02-05T15:16:00 * DATE/TIME END: 2010-11-12T11:03:00 |
long_lat |
ENVELOPE(-31.089800,28.009500,33.219440,-5.000000) |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Fischer, Tim; Banyte, Donata; Brandt, Peter; Dengler, Marcus; Krahmann, Gerd; Tanhua, Toste; Visbeck, Martin (2013): Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone. Biogeosciences, 10(7), 5079-5093, https://doi.org/10.5194/bg-10-5079-2013 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.819311 https://doi.org/10.1594/PANGAEA.819311 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.819311 https://doi.org/10.5194/bg-10-5079-2013 |
_version_ |
1766164544536707072 |