Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations
Historical observations of potential temperature (θ), salinity (S), and dissolved oxygen concentrations (O2) in the tropical and subtropical North Atlantic (0–500 m; 0–40°N, 10–90°W) were examined to understand decadal‐scale changes in O2 in subtropical underwater (STUW). STUW is observed at four of...
Published in: | Global Biogeochemical Cycles |
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Digital Commons @ University of South Florida
2016
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/1028 https://doi.org/10.1002/2015GB005183 https://digitalcommons.usf.edu/context/msc_facpub/article/2085/viewcontent/2015GB005183.pdf |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-2085 2023-07-30T04:05:11+02:00 Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations Montes, Enrique Muller-Karger, Frank E Cianca, Andrés Lomas, Michael W Lorenzoni, Laura Habtes, Sennai 2016-03-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/msc_facpub/1028 https://doi.org/10.1002/2015GB005183 https://digitalcommons.usf.edu/context/msc_facpub/article/2085/viewcontent/2015GB005183.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1028 doi:10.1002/2015GB005183 https://digitalcommons.usf.edu/context/msc_facpub/article/2085/viewcontent/2015GB005183.pdf default Marine Science Faculty Publications Atlantic Multidecadal Oscillation biogeochemical time series stations climate change dissolved oxygen North Atlantic salinity maximum subtropical underwater Life Sciences article 2016 ftusouthflorida https://doi.org/10.1002/2015GB005183 2023-07-13T21:02:55Z Historical observations of potential temperature (θ), salinity (S), and dissolved oxygen concentrations (O2) in the tropical and subtropical North Atlantic (0–500 m; 0–40°N, 10–90°W) were examined to understand decadal‐scale changes in O2 in subtropical underwater (STUW). STUW is observed at four of the longest, sustained ocean biogeochemical and ecological time series stations, namely, the CArbon Retention In A Colored Ocean (CARIACO) Ocean Time Series Program (10.5°N, 64.7°W), the Bermuda Atlantic Time‐series Study (BATS; 31.7°N, 64.2°W), Hydrostation “S” (32.1°N, 64.4°W), and the European Station for Time‐series in the Ocean, Canary Islands (ESTOC; 29.2°N, 15.5°W). Observations over similar time periods at CARIACO (1996–2013), BATS (1988–2011), and Hydrostation S (1980–2013) show that STUW O2 has decreased approximately 0.71, 0.28, and 0.37 µmol kg−1 yr−1, respectively. No apparent change in STUW O2 was observed at ESTOC over the course of the time series (1994–2013). Ship observation data for the tropical and subtropical North Atlantic archived at NOAA National Oceanographic Data Center show that between 1980 and 2013, STUW O2 (upper ~300 m) declined 0.58 µmol kg−1 yr−1 in the southeastern Caribbean Sea (10–15°N, 60–70°W) and 0.68 µmol kg−1 yr−1 in the western subtropical North Atlantic (30–35°N, 60–65°W). A declining O2 trend was not observed in the eastern subtropical North Atlantic (25–30°N, 15–20°W) over the same period. Most of the observed O2 loss seems to result from shifts in ventilation associated with decreased wind‐driven mixing and a slowing down of STUW formation rates, rather than changes in diffusive air‐sea O2 gas exchange or changes in the biological oceanography of the North Atlantic. Variability of STUW O2 showed a significant relationship with the wintertime (January–March) Atlantic Multidecadal Oscillation index (AMO, R2 = 0.32). During negative wintertime AMO years trade winds are typically stronger between 10°N and 30°N. These conditions stimulate the formation and ventilation of STUW. ... Article in Journal/Newspaper North Atlantic University of South Florida St. Petersburg: Digital USFSP Global Biogeochemical Cycles 30 3 460 478 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Atlantic Multidecadal Oscillation biogeochemical time series stations climate change dissolved oxygen North Atlantic salinity maximum subtropical underwater Life Sciences |
spellingShingle |
Atlantic Multidecadal Oscillation biogeochemical time series stations climate change dissolved oxygen North Atlantic salinity maximum subtropical underwater Life Sciences Montes, Enrique Muller-Karger, Frank E Cianca, Andrés Lomas, Michael W Lorenzoni, Laura Habtes, Sennai Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations |
topic_facet |
Atlantic Multidecadal Oscillation biogeochemical time series stations climate change dissolved oxygen North Atlantic salinity maximum subtropical underwater Life Sciences |
description |
Historical observations of potential temperature (θ), salinity (S), and dissolved oxygen concentrations (O2) in the tropical and subtropical North Atlantic (0–500 m; 0–40°N, 10–90°W) were examined to understand decadal‐scale changes in O2 in subtropical underwater (STUW). STUW is observed at four of the longest, sustained ocean biogeochemical and ecological time series stations, namely, the CArbon Retention In A Colored Ocean (CARIACO) Ocean Time Series Program (10.5°N, 64.7°W), the Bermuda Atlantic Time‐series Study (BATS; 31.7°N, 64.2°W), Hydrostation “S” (32.1°N, 64.4°W), and the European Station for Time‐series in the Ocean, Canary Islands (ESTOC; 29.2°N, 15.5°W). Observations over similar time periods at CARIACO (1996–2013), BATS (1988–2011), and Hydrostation S (1980–2013) show that STUW O2 has decreased approximately 0.71, 0.28, and 0.37 µmol kg−1 yr−1, respectively. No apparent change in STUW O2 was observed at ESTOC over the course of the time series (1994–2013). Ship observation data for the tropical and subtropical North Atlantic archived at NOAA National Oceanographic Data Center show that between 1980 and 2013, STUW O2 (upper ~300 m) declined 0.58 µmol kg−1 yr−1 in the southeastern Caribbean Sea (10–15°N, 60–70°W) and 0.68 µmol kg−1 yr−1 in the western subtropical North Atlantic (30–35°N, 60–65°W). A declining O2 trend was not observed in the eastern subtropical North Atlantic (25–30°N, 15–20°W) over the same period. Most of the observed O2 loss seems to result from shifts in ventilation associated with decreased wind‐driven mixing and a slowing down of STUW formation rates, rather than changes in diffusive air‐sea O2 gas exchange or changes in the biological oceanography of the North Atlantic. Variability of STUW O2 showed a significant relationship with the wintertime (January–March) Atlantic Multidecadal Oscillation index (AMO, R2 = 0.32). During negative wintertime AMO years trade winds are typically stronger between 10°N and 30°N. These conditions stimulate the formation and ventilation of STUW. ... |
format |
Article in Journal/Newspaper |
author |
Montes, Enrique Muller-Karger, Frank E Cianca, Andrés Lomas, Michael W Lorenzoni, Laura Habtes, Sennai |
author_facet |
Montes, Enrique Muller-Karger, Frank E Cianca, Andrés Lomas, Michael W Lorenzoni, Laura Habtes, Sennai |
author_sort |
Montes, Enrique |
title |
Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations |
title_short |
Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations |
title_full |
Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations |
title_fullStr |
Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations |
title_full_unstemmed |
Decadal Variability in the Oxygen Inventory of North Atlantic Subtropical Underwater Captured by Sustained, Long-Term Oceanographic Time Series Observations |
title_sort |
decadal variability in the oxygen inventory of north atlantic subtropical underwater captured by sustained, long-term oceanographic time series observations |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2016 |
url |
https://digitalcommons.usf.edu/msc_facpub/1028 https://doi.org/10.1002/2015GB005183 https://digitalcommons.usf.edu/context/msc_facpub/article/2085/viewcontent/2015GB005183.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1028 doi:10.1002/2015GB005183 https://digitalcommons.usf.edu/context/msc_facpub/article/2085/viewcontent/2015GB005183.pdf |
op_rights |
default |
op_doi |
https://doi.org/10.1002/2015GB005183 |
container_title |
Global Biogeochemical Cycles |
container_volume |
30 |
container_issue |
3 |
container_start_page |
460 |
op_container_end_page |
478 |
_version_ |
1772816942411808768 |