A numerical study of interannual variability in the North Icelandic Irminger Current
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 123(12), (2018): 8994-9009, doi:10.1029/2018JC013800. T...
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Online Access: | https://hdl.handle.net/1912/23698 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/23698 2023-05-15T16:52:18+02:00 A numerical study of interannual variability in the North Icelandic Irminger Current Zhao, Jian Yang, Jiayan Semper, Stefanie Pickart, Robert S. Våge, Kjetil Valdimarsson, Héðinn Jónsson, Steingrímur 2018-10-11 https://hdl.handle.net/1912/23698 unknown American Geophysical Union https://doi.org/10.1029/2018JC013800 Zhao, J., Yang, JY., Semper, S., Pickart, RS., Vage, K., Valdimarsson, H., Jonsson, S. (2018). A numerical study of interannual variability in the North Icelandic Irminger Current. Journal of Geophysical Research-Oceans, 123(12), 8994-9009 https://hdl.handle.net/1912/23698 doi:10.1029/2018JC013800 Zhao, J., Yang, JY., Semper, S., Pickart, RS., Vage, K., Valdimarsson, H., Jonsson, S. (2018). A numerical study of interannual variability in the North Icelandic Irminger Current. Journal of Geophysical Research-Oceans, 123(12), 8994-9009 doi:10.1029/2018JC013800 Irminger Current Interannual Wind Numerical modeling Article 2018 ftwhoas https://doi.org/10.1029/2018JC013800 2022-10-29T22:57:15Z Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 123(12), (2018): 8994-9009, doi:10.1029/2018JC013800. The North Icelandic Irminger Current (NIIC) is an important component of the Atlantic Water (AW) inflow to the Nordic Seas. In this study, both observations and a high‐resolution (1/12°) numerical model are used to investigate the seasonal to interannual variability of the NIIC and its forcing mechanisms. The model‐simulated velocity and hydrographic fields compare well with the available observations. The water mass over the entire north Icelandic shelf exhibits strong seasonal variations in both temperature and salinity, and such variations are closely tied to the AW seasonality in the NIIC. In addition to seasonal variability, there is considerable variation on interannual time scales, including a prominent event in 2003 when the AW volume transport increased by about 0.5 Sv. To identify and examine key forcing mechanisms for this event, we analyzed outputs from two additional numerical experiments: using only the seasonal climatology for buoyancy flux (the momentum case) and using only the seasonal climatology for wind stress (the buoyancy case). It is found that changes in the wind stress are predominantly responsible for the interannual variations in the AW volume transport, AW fraction in the NIIC water, and salinity. Temperature changes on the shelf, however, are equally attributable to the buoyancy flux and wind forcing. Correlational analyses indicate that the AW volume transport is most sensitive to the wind stress southwest of Iceland. This work is supported by the U.S. National Science Foundation (NSF) under grants OCE‐1634886 (J. Zhao and J. Yang) and OCE‐1558742 (R. Pickart), and by the Bergen Research Foundation grant BFS2016REK01 (K. Våge and S. Semper). We thank Xiaobiao Xu at Florida State ... Article in Journal/Newspaper Iceland Nordic Seas North Icelandic Irminger Current NIIC Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Bergen Våge ENVELOPE(14.851,14.851,68.922,68.922) Journal of Geophysical Research: Oceans 123 12 8994 9009 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Irminger Current Interannual Wind Numerical modeling |
spellingShingle |
Irminger Current Interannual Wind Numerical modeling Zhao, Jian Yang, Jiayan Semper, Stefanie Pickart, Robert S. Våge, Kjetil Valdimarsson, Héðinn Jónsson, Steingrímur A numerical study of interannual variability in the North Icelandic Irminger Current |
topic_facet |
Irminger Current Interannual Wind Numerical modeling |
description |
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 123(12), (2018): 8994-9009, doi:10.1029/2018JC013800. The North Icelandic Irminger Current (NIIC) is an important component of the Atlantic Water (AW) inflow to the Nordic Seas. In this study, both observations and a high‐resolution (1/12°) numerical model are used to investigate the seasonal to interannual variability of the NIIC and its forcing mechanisms. The model‐simulated velocity and hydrographic fields compare well with the available observations. The water mass over the entire north Icelandic shelf exhibits strong seasonal variations in both temperature and salinity, and such variations are closely tied to the AW seasonality in the NIIC. In addition to seasonal variability, there is considerable variation on interannual time scales, including a prominent event in 2003 when the AW volume transport increased by about 0.5 Sv. To identify and examine key forcing mechanisms for this event, we analyzed outputs from two additional numerical experiments: using only the seasonal climatology for buoyancy flux (the momentum case) and using only the seasonal climatology for wind stress (the buoyancy case). It is found that changes in the wind stress are predominantly responsible for the interannual variations in the AW volume transport, AW fraction in the NIIC water, and salinity. Temperature changes on the shelf, however, are equally attributable to the buoyancy flux and wind forcing. Correlational analyses indicate that the AW volume transport is most sensitive to the wind stress southwest of Iceland. This work is supported by the U.S. National Science Foundation (NSF) under grants OCE‐1634886 (J. Zhao and J. Yang) and OCE‐1558742 (R. Pickart), and by the Bergen Research Foundation grant BFS2016REK01 (K. Våge and S. Semper). We thank Xiaobiao Xu at Florida State ... |
format |
Article in Journal/Newspaper |
author |
Zhao, Jian Yang, Jiayan Semper, Stefanie Pickart, Robert S. Våge, Kjetil Valdimarsson, Héðinn Jónsson, Steingrímur |
author_facet |
Zhao, Jian Yang, Jiayan Semper, Stefanie Pickart, Robert S. Våge, Kjetil Valdimarsson, Héðinn Jónsson, Steingrímur |
author_sort |
Zhao, Jian |
title |
A numerical study of interannual variability in the North Icelandic Irminger Current |
title_short |
A numerical study of interannual variability in the North Icelandic Irminger Current |
title_full |
A numerical study of interannual variability in the North Icelandic Irminger Current |
title_fullStr |
A numerical study of interannual variability in the North Icelandic Irminger Current |
title_full_unstemmed |
A numerical study of interannual variability in the North Icelandic Irminger Current |
title_sort |
numerical study of interannual variability in the north icelandic irminger current |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/23698 |
long_lat |
ENVELOPE(14.851,14.851,68.922,68.922) |
geographic |
Bergen Våge |
geographic_facet |
Bergen Våge |
genre |
Iceland Nordic Seas North Icelandic Irminger Current NIIC |
genre_facet |
Iceland Nordic Seas North Icelandic Irminger Current NIIC |
op_source |
Zhao, J., Yang, JY., Semper, S., Pickart, RS., Vage, K., Valdimarsson, H., Jonsson, S. (2018). A numerical study of interannual variability in the North Icelandic Irminger Current. Journal of Geophysical Research-Oceans, 123(12), 8994-9009 doi:10.1029/2018JC013800 |
op_relation |
https://doi.org/10.1029/2018JC013800 Zhao, J., Yang, JY., Semper, S., Pickart, RS., Vage, K., Valdimarsson, H., Jonsson, S. (2018). A numerical study of interannual variability in the North Icelandic Irminger Current. Journal of Geophysical Research-Oceans, 123(12), 8994-9009 https://hdl.handle.net/1912/23698 doi:10.1029/2018JC013800 |
op_doi |
https://doi.org/10.1029/2018JC013800 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
12 |
container_start_page |
8994 |
op_container_end_page |
9009 |
_version_ |
1766042438389989376 |