Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012
Seasonal coastal upwelling was analyzed along the NW African coastline (11-35°N) from 1981 to 2012. Upwelling magnitudes are calculated by wind speed indices, sea-surface temperature indices and inferred from meteorological station, sea-surface height and vertical water column transport data. A per...
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ftulincoln:oai:eprints.lincoln.ac.uk:25984 2023-05-15T17:34:26+02:00 Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012 Cropper, Thomas E. Hanna, Edward Bigg, Grant R. 2014-04-01 application/pdf https://eprints.lincoln.ac.uk/id/eprint/25984/ https://eprints.lincoln.ac.uk/id/eprint/25984/1/1-s2.0-S0967063714000181-main.pdf https://doi.org/10.1016/j.dsr.2014.01.007 en eng Elsevier https://eprints.lincoln.ac.uk/id/eprint/25984/1/1-s2.0-S0967063714000181-main.pdf Cropper, Thomas E., Hanna, Edward and Bigg, Grant R. (2014) Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012. Deep-Sea Research Part I: Oceanographic Research Papers, 86 . pp. 94-111. ISSN 0967-0637 doi:10.1016/j.dsr.2014.01.007 cc_by CC-BY F332 Marine Physics Article PeerReviewed 2014 ftulincoln https://doi.org/10.1016/j.dsr.2014.01.007 2022-03-02T20:07:06Z Seasonal coastal upwelling was analyzed along the NW African coastline (11-35°N) from 1981 to 2012. Upwelling magnitudes are calculated by wind speed indices, sea-surface temperature indices and inferred from meteorological station, sea-surface height and vertical water column transport data. A permanent annual upwelling regime is documented across 21-35°N and a seasonal regime across 12-19°N, in accordance with the climatology of previous studies. Upwelling regions were split into three zones: (1) the Mauritania-Senegalese upwelling zone (12-19°N), (2) the strong permanent annual upwelling zone (21-26°N) and (3) the weak permanent upwelling zone (26-35°N). We find compelling evidence in our various indices for the Bakun upwelling intensification hypothesis due to a significant coastal summer wind speed increase, resulting in an increase in upwelling-favorable wind speeds north of 20°N and an increase in downwelling-favorable winds south of 20°N. The North Atlantic Oscillation plays a leading role in modifying interannual variability during the other seasons (autumn-spring), with its influence dominating in winter. The East Atlantic pattern shows a strong correlation with upwelling during spring, while El Niño Southern Oscillation and Atlantic Multi-decadal Oscillation teleconnections were not found. A disagreement between observationally-based wind speed products and reanalysis-derived data is explored. A modification to the Bakun upwelling intensification hypothesis for NW Africa is presented, which accounts for the latitudinal divide in summer wind regimes. © 2014 The Authors. Article in Journal/Newspaper North Atlantic North Atlantic oscillation University of Lincoln: Lincoln Repository Deep Sea Research Part I: Oceanographic Research Papers 86 94 111 |
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Open Polar |
collection |
University of Lincoln: Lincoln Repository |
op_collection_id |
ftulincoln |
language |
English |
topic |
F332 Marine Physics |
spellingShingle |
F332 Marine Physics Cropper, Thomas E. Hanna, Edward Bigg, Grant R. Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012 |
topic_facet |
F332 Marine Physics |
description |
Seasonal coastal upwelling was analyzed along the NW African coastline (11-35°N) from 1981 to 2012. Upwelling magnitudes are calculated by wind speed indices, sea-surface temperature indices and inferred from meteorological station, sea-surface height and vertical water column transport data. A permanent annual upwelling regime is documented across 21-35°N and a seasonal regime across 12-19°N, in accordance with the climatology of previous studies. Upwelling regions were split into three zones: (1) the Mauritania-Senegalese upwelling zone (12-19°N), (2) the strong permanent annual upwelling zone (21-26°N) and (3) the weak permanent upwelling zone (26-35°N). We find compelling evidence in our various indices for the Bakun upwelling intensification hypothesis due to a significant coastal summer wind speed increase, resulting in an increase in upwelling-favorable wind speeds north of 20°N and an increase in downwelling-favorable winds south of 20°N. The North Atlantic Oscillation plays a leading role in modifying interannual variability during the other seasons (autumn-spring), with its influence dominating in winter. The East Atlantic pattern shows a strong correlation with upwelling during spring, while El Niño Southern Oscillation and Atlantic Multi-decadal Oscillation teleconnections were not found. A disagreement between observationally-based wind speed products and reanalysis-derived data is explored. A modification to the Bakun upwelling intensification hypothesis for NW Africa is presented, which accounts for the latitudinal divide in summer wind regimes. © 2014 The Authors. |
format |
Article in Journal/Newspaper |
author |
Cropper, Thomas E. Hanna, Edward Bigg, Grant R. |
author_facet |
Cropper, Thomas E. Hanna, Edward Bigg, Grant R. |
author_sort |
Cropper, Thomas E. |
title |
Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012 |
title_short |
Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012 |
title_full |
Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012 |
title_fullStr |
Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012 |
title_full_unstemmed |
Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012 |
title_sort |
spatial and temporal seasonal trends in coastal upwelling off northwest africa, 1981-2012 |
publisher |
Elsevier |
publishDate |
2014 |
url |
https://eprints.lincoln.ac.uk/id/eprint/25984/ https://eprints.lincoln.ac.uk/id/eprint/25984/1/1-s2.0-S0967063714000181-main.pdf https://doi.org/10.1016/j.dsr.2014.01.007 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://eprints.lincoln.ac.uk/id/eprint/25984/1/1-s2.0-S0967063714000181-main.pdf Cropper, Thomas E., Hanna, Edward and Bigg, Grant R. (2014) Spatial and temporal seasonal trends in coastal upwelling off Northwest Africa, 1981-2012. Deep-Sea Research Part I: Oceanographic Research Papers, 86 . pp. 94-111. ISSN 0967-0637 doi:10.1016/j.dsr.2014.01.007 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.dsr.2014.01.007 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
86 |
container_start_page |
94 |
op_container_end_page |
111 |
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