Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation.
In this paper we investigate the possibility of determining North Atlantic meridional transport variability using pressure on the western boundary, focusing on the 42degN latitude of the Halifax WAVE array. We start by reviewing the theoretical foundations of this approach. Next we present results f...
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American Geophysical Union
2008
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ftnerc:oai:nora.nerc.ac.uk:5016 2024-06-09T07:48:07+00:00 Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. Bingham, R. J. Hughes, C. W. 2008-09-04 text http://nora.nerc.ac.uk/id/eprint/5016/ https://nora.nerc.ac.uk/id/eprint/5016/1/2008_Bingham%2BHughes_JGR_MOC_accepted.pdf http://www.agu.org/journals/jc/jc0809/2007JC004679/2007JC004679.pdf en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/5016/1/2008_Bingham%2BHughes_JGR_MOC_accepted.pdf Bingham, R. J.; Hughes, C. W. orcid:0000-0002-9355-0233 . 2008 Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. Journal of Geophysical Research, 113 (C9), C09008. 16, pp. https://doi.org/10.1029/2007JC004679 <https://doi.org/10.1029/2007JC004679> Marine Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1029/2007JC004679 2024-05-15T08:49:44Z In this paper we investigate the possibility of determining North Atlantic meridional transport variability using pressure on the western boundary, focusing on the 42degN latitude of the Halifax WAVE array. We start by reviewing the theoretical foundations of this approach. Next we present results from a model analysis, both statistical and dynamic, that demonstrate the feasibility of the approach. We consider how well we can quantify the meridional transport variability at 42degN given complete knowledge of bottom pressure across the basin, and to what degree this quantification is degraded by first ignoring the effect of intervening topography, and then by using only bottom pressure on the western boundary. We find that for periods of greater than one year we can recover more than 90% of the variability of the main overturning cell at 42degN using only the western boundary pressure, provided we remove the depth-average boundary pressure signal. This signal arises from a basin mode of bottom pressure variability, which has power at all timescales, but that does not in truth have a meridional transport signal associated with it, and from the geostrophic depth-independent compensation of the Ekman transport. An additional benefit of the removal of the depth-average pressure is that this high-frequency Ekman signal, which is essentially noise as far as monitoring the MOC for climatically important changes is concerned, is clearly separated from other modes. Article in Journal/Newspaper North Atlantic Natural Environment Research Council: NERC Open Research Archive Journal of Geophysical Research 113 C9 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences |
spellingShingle |
Marine Sciences Bingham, R. J. Hughes, C. W. Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. |
topic_facet |
Marine Sciences |
description |
In this paper we investigate the possibility of determining North Atlantic meridional transport variability using pressure on the western boundary, focusing on the 42degN latitude of the Halifax WAVE array. We start by reviewing the theoretical foundations of this approach. Next we present results from a model analysis, both statistical and dynamic, that demonstrate the feasibility of the approach. We consider how well we can quantify the meridional transport variability at 42degN given complete knowledge of bottom pressure across the basin, and to what degree this quantification is degraded by first ignoring the effect of intervening topography, and then by using only bottom pressure on the western boundary. We find that for periods of greater than one year we can recover more than 90% of the variability of the main overturning cell at 42degN using only the western boundary pressure, provided we remove the depth-average boundary pressure signal. This signal arises from a basin mode of bottom pressure variability, which has power at all timescales, but that does not in truth have a meridional transport signal associated with it, and from the geostrophic depth-independent compensation of the Ekman transport. An additional benefit of the removal of the depth-average pressure is that this high-frequency Ekman signal, which is essentially noise as far as monitoring the MOC for climatically important changes is concerned, is clearly separated from other modes. |
format |
Article in Journal/Newspaper |
author |
Bingham, R. J. Hughes, C. W. |
author_facet |
Bingham, R. J. Hughes, C. W. |
author_sort |
Bingham, R. J. |
title |
Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. |
title_short |
Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. |
title_full |
Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. |
title_fullStr |
Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. |
title_full_unstemmed |
Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. |
title_sort |
determining north atlantic meridional transport variability from pressure on the western boundary: a model investigation. |
publisher |
American Geophysical Union |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/5016/ https://nora.nerc.ac.uk/id/eprint/5016/1/2008_Bingham%2BHughes_JGR_MOC_accepted.pdf http://www.agu.org/journals/jc/jc0809/2007JC004679/2007JC004679.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/5016/1/2008_Bingham%2BHughes_JGR_MOC_accepted.pdf Bingham, R. J.; Hughes, C. W. orcid:0000-0002-9355-0233 . 2008 Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation. Journal of Geophysical Research, 113 (C9), C09008. 16, pp. https://doi.org/10.1029/2007JC004679 <https://doi.org/10.1029/2007JC004679> |
op_doi |
https://doi.org/10.1029/2007JC004679 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
C9 |
_version_ |
1801379712575995904 |