Gulf Stream Variability and Ocean–Atmosphere Interactions*
International audience Time series of Gulf Stream position derived from the TOPEX/Poseidon altimeter from October 1992 to November 1998 are used to investigate the lead and lag relation between the Gulf Stream path as it leaves the continental shelf and the changes in sea level pressure, surface win...
Main Authors: | , , , |
---|---|
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2001
|
Subjects: | |
Online Access: | https://hal.science/hal-03842692 https://hal.science/hal-03842692/document https://hal.science/hal-03842692/file/frankignoul_3516.pdf https://doi.org/10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;2 |
id |
ftsorbonneuniv:oai:HAL:hal-03842692v1 |
---|---|
record_format |
openpolar |
spelling |
ftsorbonneuniv:oai:HAL:hal-03842692v1 2023-12-24T10:23:15+01:00 Gulf Stream Variability and Ocean–Atmosphere Interactions* Frankignoul, Claude de Coëtlogon, Gaëlle Joyce, Terrence Dong, Shenfu Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Woods Hole Oceanographic Institution (WHOI) Applied Physics Laboratory Seattle (APL-UW) University of Washington Seattle 2001-12 https://hal.science/hal-03842692 https://hal.science/hal-03842692/document https://hal.science/hal-03842692/file/frankignoul_3516.pdf https://doi.org/10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;2 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;2 hal-03842692 https://hal.science/hal-03842692 https://hal.science/hal-03842692/document https://hal.science/hal-03842692/file/frankignoul_3516.pdf doi:10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;2 info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-03842692 Journal of Physical Oceanography, 2001, 31 (12), pp.3516-3529. ⟨10.1175/1520-0485(2002)0312.0.CO;2⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2001 ftsorbonneuniv https://doi.org/10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;210.1175/1520-0485(2002)0312.0.CO;2 2023-11-28T23:36:02Z International audience Time series of Gulf Stream position derived from the TOPEX/Poseidon altimeter from October 1992 to November 1998 are used to investigate the lead and lag relation between the Gulf Stream path as it leaves the continental shelf and the changes in sea level pressure, surface wind stress, and sea surface temperature (SST), as given by the NCEP reanalysis. The dominant signal is a northward (southward) displacement of Gulf Stream axis 11 to 18 months after the North Atlantic Oscillation (NAO) reaches positive (negative) extrema. A SST warming (cooling) peaking north of the Gulf Stream is also seen to precede the latitudinal shifts, but it is a part of the large-scale SST anomaly tripole that is generated by the NAO fluctuations. There is no evidence that the Gulf Stream shifts have a direct impact onto the large-scale atmospheric circulation. A fast, passive response of the Gulf Stream to NAO forcing is also suggested by a corresponding analysis of the yearly mean Gulf Stream position estimated from XBT data at 200 m during 1954–98, where the NAO primarily leads the latitudinal Gulf Stream shifts by 1 yr. The fast Gulf Stream response seems to reflect buoyancy forcing in the recirculation gyres but, as the covariability remains significant when the NAO leads by up to 9 yr, large-scale wind stress forcing may become important after a longer delay. Because of the high NAO index of the last decades, the TOPEX/Poseidon period is one of unprecedented northward excursion of the Gulf Stream in the 45-yr record, with the Gulf Stream 50–100 km north of its climatological mean position. Article in Journal/Newspaper North Atlantic North Atlantic oscillation HAL Sorbonne Université |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Frankignoul, Claude de Coëtlogon, Gaëlle Joyce, Terrence Dong, Shenfu Gulf Stream Variability and Ocean–Atmosphere Interactions* |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Time series of Gulf Stream position derived from the TOPEX/Poseidon altimeter from October 1992 to November 1998 are used to investigate the lead and lag relation between the Gulf Stream path as it leaves the continental shelf and the changes in sea level pressure, surface wind stress, and sea surface temperature (SST), as given by the NCEP reanalysis. The dominant signal is a northward (southward) displacement of Gulf Stream axis 11 to 18 months after the North Atlantic Oscillation (NAO) reaches positive (negative) extrema. A SST warming (cooling) peaking north of the Gulf Stream is also seen to precede the latitudinal shifts, but it is a part of the large-scale SST anomaly tripole that is generated by the NAO fluctuations. There is no evidence that the Gulf Stream shifts have a direct impact onto the large-scale atmospheric circulation. A fast, passive response of the Gulf Stream to NAO forcing is also suggested by a corresponding analysis of the yearly mean Gulf Stream position estimated from XBT data at 200 m during 1954–98, where the NAO primarily leads the latitudinal Gulf Stream shifts by 1 yr. The fast Gulf Stream response seems to reflect buoyancy forcing in the recirculation gyres but, as the covariability remains significant when the NAO leads by up to 9 yr, large-scale wind stress forcing may become important after a longer delay. Because of the high NAO index of the last decades, the TOPEX/Poseidon period is one of unprecedented northward excursion of the Gulf Stream in the 45-yr record, with the Gulf Stream 50–100 km north of its climatological mean position. |
author2 |
Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Woods Hole Oceanographic Institution (WHOI) Applied Physics Laboratory Seattle (APL-UW) University of Washington Seattle |
format |
Article in Journal/Newspaper |
author |
Frankignoul, Claude de Coëtlogon, Gaëlle Joyce, Terrence Dong, Shenfu |
author_facet |
Frankignoul, Claude de Coëtlogon, Gaëlle Joyce, Terrence Dong, Shenfu |
author_sort |
Frankignoul, Claude |
title |
Gulf Stream Variability and Ocean–Atmosphere Interactions* |
title_short |
Gulf Stream Variability and Ocean–Atmosphere Interactions* |
title_full |
Gulf Stream Variability and Ocean–Atmosphere Interactions* |
title_fullStr |
Gulf Stream Variability and Ocean–Atmosphere Interactions* |
title_full_unstemmed |
Gulf Stream Variability and Ocean–Atmosphere Interactions* |
title_sort |
gulf stream variability and ocean–atmosphere interactions* |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.science/hal-03842692 https://hal.science/hal-03842692/document https://hal.science/hal-03842692/file/frankignoul_3516.pdf https://doi.org/10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;2 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-03842692 Journal of Physical Oceanography, 2001, 31 (12), pp.3516-3529. ⟨10.1175/1520-0485(2002)0312.0.CO;2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;2 hal-03842692 https://hal.science/hal-03842692 https://hal.science/hal-03842692/document https://hal.science/hal-03842692/file/frankignoul_3516.pdf doi:10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;2 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/1520-0485(2002)031<3516:GSVAOA>2.0.CO;210.1175/1520-0485(2002)0312.0.CO;2 |
_version_ |
1786197105749000192 |