The dominant influence of the Icelandic Low on the position of the Gulf Stream northwall

Sultan Hameed, Sergey Piontkovski

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The location where the Gulf Stream separates from the American coast and turns eastward is called its northwall. The interannual fluctuations of the northwall are significantly correlated with the North Atlantic Oscillation with a lag of two years. When the Azores High and the Icelandic Low pressures are taken as independent variables, the latter dominates the relationship with the northwall, and the influence of the Azores High pressure is insignificant. This is consistent with the hypothesis that the major oceanic control of the northwall is in the southward flow of Labrador Sea Water into the Slope Sea. The alternative mechanism that the interaction of westward propagating Rossby waves with the American coast is responsible for northwall fluctuations is considered less likely because its initiation requires perturbations of the eastward winds in the mid-Atlantic region, and they are very likely dependent on the Azores High. The analysis suggests that the time lag between perturbations of the Icelandic Low and the northwall varies between one and three years.

Original languageEnglish
JournalGeophysical Research Letters
Volume31
Issue number9
DOIs
Publication statusPublished - May 16 2004

Fingerprint

Gulf Stream
Azores
perturbation
coasts
coast
Rossby wave
time lag
North Atlantic Oscillation
Labrador
low pressure
sea water
seawater
planetary waves
slopes
oscillations
gulf
interactions
analysis
sea

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

The dominant influence of the Icelandic Low on the position of the Gulf Stream northwall. / Hameed, Sultan; Piontkovski, Sergey.

In: Geophysical Research Letters, Vol. 31, No. 9, 16.05.2004.

Research output: Contribution to journalArticle

@article{1b1da0560a89473fa80105659835b41e,
title = "The dominant influence of the Icelandic Low on the position of the Gulf Stream northwall",
abstract = "The location where the Gulf Stream separates from the American coast and turns eastward is called its northwall. The interannual fluctuations of the northwall are significantly correlated with the North Atlantic Oscillation with a lag of two years. When the Azores High and the Icelandic Low pressures are taken as independent variables, the latter dominates the relationship with the northwall, and the influence of the Azores High pressure is insignificant. This is consistent with the hypothesis that the major oceanic control of the northwall is in the southward flow of Labrador Sea Water into the Slope Sea. The alternative mechanism that the interaction of westward propagating Rossby waves with the American coast is responsible for northwall fluctuations is considered less likely because its initiation requires perturbations of the eastward winds in the mid-Atlantic region, and they are very likely dependent on the Azores High. The analysis suggests that the time lag between perturbations of the Icelandic Low and the northwall varies between one and three years.",
author = "Sultan Hameed and Sergey Piontkovski",
year = "2004",
month = "5",
day = "16",
doi = "10.1029/2004GL019561",
language = "English",
volume = "31",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "9",

}

TY - JOUR

T1 - The dominant influence of the Icelandic Low on the position of the Gulf Stream northwall

AU - Hameed, Sultan

AU - Piontkovski, Sergey

PY - 2004/5/16

Y1 - 2004/5/16

N2 - The location where the Gulf Stream separates from the American coast and turns eastward is called its northwall. The interannual fluctuations of the northwall are significantly correlated with the North Atlantic Oscillation with a lag of two years. When the Azores High and the Icelandic Low pressures are taken as independent variables, the latter dominates the relationship with the northwall, and the influence of the Azores High pressure is insignificant. This is consistent with the hypothesis that the major oceanic control of the northwall is in the southward flow of Labrador Sea Water into the Slope Sea. The alternative mechanism that the interaction of westward propagating Rossby waves with the American coast is responsible for northwall fluctuations is considered less likely because its initiation requires perturbations of the eastward winds in the mid-Atlantic region, and they are very likely dependent on the Azores High. The analysis suggests that the time lag between perturbations of the Icelandic Low and the northwall varies between one and three years.

AB - The location where the Gulf Stream separates from the American coast and turns eastward is called its northwall. The interannual fluctuations of the northwall are significantly correlated with the North Atlantic Oscillation with a lag of two years. When the Azores High and the Icelandic Low pressures are taken as independent variables, the latter dominates the relationship with the northwall, and the influence of the Azores High pressure is insignificant. This is consistent with the hypothesis that the major oceanic control of the northwall is in the southward flow of Labrador Sea Water into the Slope Sea. The alternative mechanism that the interaction of westward propagating Rossby waves with the American coast is responsible for northwall fluctuations is considered less likely because its initiation requires perturbations of the eastward winds in the mid-Atlantic region, and they are very likely dependent on the Azores High. The analysis suggests that the time lag between perturbations of the Icelandic Low and the northwall varies between one and three years.

UR - http://www.scopus.com/inward/record.url?scp=3543053533&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3543053533&partnerID=8YFLogxK

U2 - 10.1029/2004GL019561

DO - 10.1029/2004GL019561

M3 - Article

VL - 31

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 9

ER -