The annual salinity cycle of the Denmark Strait Overflow
© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Opher, J., Brearley, J., Dye, S., Pickart, R., Renfrew, I., Harden, B., & Meredith, M. The annual salinity cycle of the Denmark Strait Overflow....
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
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American Geophysical Union
2022
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Online Access: | https://hdl.handle.net/1912/29130 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/29130 2023-05-15T15:17:47+02:00 The annual salinity cycle of the Denmark Strait Overflow Opher, Jacob G. Brearley, J. Alexander Dye, Stephen R. Pickart, Robert S. Renfrew, Ian A. Harden, Benjamin E. Meredith, Michael P. 2022-03-22 https://hdl.handle.net/1912/29130 unknown American Geophysical Union https://doi.org/10.1029/2021jc018139 Opher, J., Brearley, J., Dye, S., Pickart, R., Renfrew, I., Harden, B., & Meredith, M. (2022). The annual salinity cycle of the Denmark Strait Overflow. Journal of Geophysical Research: Oceans, 127(4), e2021JC018139. https://hdl.handle.net/1912/29130 doi:10.1029/2021jc018139 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ CC-BY Opher, J., Brearley, J., Dye, S., Pickart, R., Renfrew, I., Harden, B., & Meredith, M. (2022). The annual salinity cycle of the Denmark Strait Overflow. Journal of Geophysical Research: Oceans, 127(4), e2021JC018139. doi:10.1029/2021jc018139 Overflow Salinity Seasonality Fresh lid Advection Article 2022 ftwhoas https://doi.org/10.1029/2021jc018139 2022-10-29T22:57:31Z © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Opher, J., Brearley, J., Dye, S., Pickart, R., Renfrew, I., Harden, B., & Meredith, M. The annual salinity cycle of the Denmark Strait Overflow. Journal of Geophysical Research: Oceans, 127(4), (2022): e2021JC018139, https://doi.org/10.1029/2021jc018139. The Denmark Strait Overflow (DSO) is an important source of dense water input to the deep limb of the Atlantic Meridional Overturning Circulation (AMOC). It is fed by separate currents from the north that advect dense water masses formed in the Nordic Seas and Arctic Ocean which then converge at Denmark Strait. Here we identify an annual salinity cycle of the DSO, characterized by freshening in winter and spring. The freshening is linked to freshening of the Shelfbreak East Greenland Current in the Blosseville Basin north of the Denmark Strait. We demonstrate that the East Greenland Current advects fresh pycnocline water above the recirculating Atlantic Water, which forms a low salinity lid for the overflow in Denmark Strait and in the Irminger Basin. This concept is supported by intensified freshening of the DSO in lighter density classes on the Greenland side of the overflow. The salinity of the DSO in the Irminger Basin is significantly correlated with northerly/northeasterly winds in the Blosseville Basin at a lag of 3–4 months, consistent with estimated transit times. This suggests that wind driven variability of DSO source water exerts an important influence on the salinity variability of the downstream DSO, and hence the composition of the deep limb of the AMOC. This research was funded by: NERC EnvEast DTP studentship NE/L002582 (JO) and Cefas Seedcorn DP371 (JO, SRD); as well as by NERC, by AFIS (NE/N009754/1) (IR), JAB is funded by NE/L011166/1, ORCHESTRA (NE/N018095/1) and ENCORE (NE/V013254/1) and RP is funded by the US National Science Foundation grants OCE-1756361 and OCE-1558742. Cefas work ... Article in Journal/Newspaper Arctic Arctic Ocean Denmark Strait East Greenland east greenland current Greenland Nordic Seas Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Arctic Ocean Brearley ENVELOPE(161.750,161.750,-77.800,-77.800) Greenland Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Meredith ENVELOPE(67.717,67.717,-71.200,-71.200) Journal of Geophysical Research: Oceans 127 4 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Overflow Salinity Seasonality Fresh lid Advection |
spellingShingle |
Overflow Salinity Seasonality Fresh lid Advection Opher, Jacob G. Brearley, J. Alexander Dye, Stephen R. Pickart, Robert S. Renfrew, Ian A. Harden, Benjamin E. Meredith, Michael P. The annual salinity cycle of the Denmark Strait Overflow |
topic_facet |
Overflow Salinity Seasonality Fresh lid Advection |
description |
© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Opher, J., Brearley, J., Dye, S., Pickart, R., Renfrew, I., Harden, B., & Meredith, M. The annual salinity cycle of the Denmark Strait Overflow. Journal of Geophysical Research: Oceans, 127(4), (2022): e2021JC018139, https://doi.org/10.1029/2021jc018139. The Denmark Strait Overflow (DSO) is an important source of dense water input to the deep limb of the Atlantic Meridional Overturning Circulation (AMOC). It is fed by separate currents from the north that advect dense water masses formed in the Nordic Seas and Arctic Ocean which then converge at Denmark Strait. Here we identify an annual salinity cycle of the DSO, characterized by freshening in winter and spring. The freshening is linked to freshening of the Shelfbreak East Greenland Current in the Blosseville Basin north of the Denmark Strait. We demonstrate that the East Greenland Current advects fresh pycnocline water above the recirculating Atlantic Water, which forms a low salinity lid for the overflow in Denmark Strait and in the Irminger Basin. This concept is supported by intensified freshening of the DSO in lighter density classes on the Greenland side of the overflow. The salinity of the DSO in the Irminger Basin is significantly correlated with northerly/northeasterly winds in the Blosseville Basin at a lag of 3–4 months, consistent with estimated transit times. This suggests that wind driven variability of DSO source water exerts an important influence on the salinity variability of the downstream DSO, and hence the composition of the deep limb of the AMOC. This research was funded by: NERC EnvEast DTP studentship NE/L002582 (JO) and Cefas Seedcorn DP371 (JO, SRD); as well as by NERC, by AFIS (NE/N009754/1) (IR), JAB is funded by NE/L011166/1, ORCHESTRA (NE/N018095/1) and ENCORE (NE/V013254/1) and RP is funded by the US National Science Foundation grants OCE-1756361 and OCE-1558742. Cefas work ... |
format |
Article in Journal/Newspaper |
author |
Opher, Jacob G. Brearley, J. Alexander Dye, Stephen R. Pickart, Robert S. Renfrew, Ian A. Harden, Benjamin E. Meredith, Michael P. |
author_facet |
Opher, Jacob G. Brearley, J. Alexander Dye, Stephen R. Pickart, Robert S. Renfrew, Ian A. Harden, Benjamin E. Meredith, Michael P. |
author_sort |
Opher, Jacob G. |
title |
The annual salinity cycle of the Denmark Strait Overflow |
title_short |
The annual salinity cycle of the Denmark Strait Overflow |
title_full |
The annual salinity cycle of the Denmark Strait Overflow |
title_fullStr |
The annual salinity cycle of the Denmark Strait Overflow |
title_full_unstemmed |
The annual salinity cycle of the Denmark Strait Overflow |
title_sort |
annual salinity cycle of the denmark strait overflow |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://hdl.handle.net/1912/29130 |
long_lat |
ENVELOPE(161.750,161.750,-77.800,-77.800) ENVELOPE(-36.000,-36.000,61.000,61.000) ENVELOPE(67.717,67.717,-71.200,-71.200) |
geographic |
Arctic Arctic Ocean Brearley Greenland Irminger Basin Meredith |
geographic_facet |
Arctic Arctic Ocean Brearley Greenland Irminger Basin Meredith |
genre |
Arctic Arctic Ocean Denmark Strait East Greenland east greenland current Greenland Nordic Seas |
genre_facet |
Arctic Arctic Ocean Denmark Strait East Greenland east greenland current Greenland Nordic Seas |
op_source |
Opher, J., Brearley, J., Dye, S., Pickart, R., Renfrew, I., Harden, B., & Meredith, M. (2022). The annual salinity cycle of the Denmark Strait Overflow. Journal of Geophysical Research: Oceans, 127(4), e2021JC018139. doi:10.1029/2021jc018139 |
op_relation |
https://doi.org/10.1029/2021jc018139 Opher, J., Brearley, J., Dye, S., Pickart, R., Renfrew, I., Harden, B., & Meredith, M. (2022). The annual salinity cycle of the Denmark Strait Overflow. Journal of Geophysical Research: Oceans, 127(4), e2021JC018139. https://hdl.handle.net/1912/29130 doi:10.1029/2021jc018139 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021jc018139 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
4 |
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1766348013701169152 |