Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge
We have used a coupled ocean-iceberg model to study the variation in global ocean circulation and North Atlantic iceberg flux from 1900 to 2008. The latter component of the study focused particularly on Greenland icebergs feeding into the Labrador Current and past Newfoundland. The model was forced...
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ftulincoln:oai:eprints.lincoln.ac.uk:25976 2023-05-15T15:35:00+02:00 Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge Wilton, David j. Bigg, Grant R. Hanna, Edward 2015-11-01 application/pdf https://eprints.lincoln.ac.uk/id/eprint/25976/ https://eprints.lincoln.ac.uk/id/eprint/25976/1/1-s2.0-S007966111500155X-main.pdf https://doi.org/10.1016/j.pocean.2015.07.003 en eng Elsevier Ltd https://eprints.lincoln.ac.uk/id/eprint/25976/1/1-s2.0-S007966111500155X-main.pdf Wilton, David j., Bigg, Grant R. and Hanna, Edward (2015) Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge. Progress in Oceanography, 138 (A). pp. 194-210. ISSN 0079-6611 doi:10.1016/j.pocean.2015.07.003 cc_by4 CC-BY F330 Environmental Physics Article PeerReviewed 2015 ftulincoln https://doi.org/10.1016/j.pocean.2015.07.003 2022-03-02T20:07:06Z We have used a coupled ocean-iceberg model to study the variation in global ocean circulation and North Atlantic iceberg flux from 1900 to 2008. The latter component of the study focused particularly on Greenland icebergs feeding into the Labrador Current and past Newfoundland. The model was forced with daily heat, freshwater and wind fluxes from the Twentieth Century Reanalysis. The reanalysis heat fluxes were shown to be offset from the, shorter, NCEP reanalysis and a grid-point correction was applied to this component of the forcing. The model produces a generally realistic ocean circulation, although with an enhanced Atlantic Meridional Overturning largely due to the forcing. The modelled iceberg flux at 48°N is well correlated with the long-term observed flux when using a modelled iceberg discharge that varies in a similar fashion to the highly variable observed flux at 48°N. From this model we infer changes in the spatial and temporal variability of iceberg calving from western Greenland. During the first third of the twentieth century the majority of modelled icebergs reaching 48°N derive from southern Greenland, while only after 1930 is the traditional perspective of a majority of such icebergs originating from Baffin Bay consistent with model results. Decadal-scale changes in the dominant regional sources are found, with oscillations between western Greenland and northern Baffin Bay. The latter origin was modelled to be most important in the last third of the twentieth century, although west Greenland sources have increased in importance in recent years. The model correctly reproduces the pronounced late spring peak in flux at 48°N for southern Greenland icebergs, but has an approximately six month offset for icebergs from Baffin Bay, most likely due to resolution issues leading to model icebergs not being delayed in shallow coastal waters, whereas in reality they may be grounded for some time or trapped in coastal sea-ice. © 2015 The Authors. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Greenland Newfoundland North Atlantic Sea ice University of Lincoln: Lincoln Repository Newfoundland Baffin Bay Greenland Progress in Oceanography 138 194 210 |
institution |
Open Polar |
collection |
University of Lincoln: Lincoln Repository |
op_collection_id |
ftulincoln |
language |
English |
topic |
F330 Environmental Physics |
spellingShingle |
F330 Environmental Physics Wilton, David j. Bigg, Grant R. Hanna, Edward Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge |
topic_facet |
F330 Environmental Physics |
description |
We have used a coupled ocean-iceberg model to study the variation in global ocean circulation and North Atlantic iceberg flux from 1900 to 2008. The latter component of the study focused particularly on Greenland icebergs feeding into the Labrador Current and past Newfoundland. The model was forced with daily heat, freshwater and wind fluxes from the Twentieth Century Reanalysis. The reanalysis heat fluxes were shown to be offset from the, shorter, NCEP reanalysis and a grid-point correction was applied to this component of the forcing. The model produces a generally realistic ocean circulation, although with an enhanced Atlantic Meridional Overturning largely due to the forcing. The modelled iceberg flux at 48°N is well correlated with the long-term observed flux when using a modelled iceberg discharge that varies in a similar fashion to the highly variable observed flux at 48°N. From this model we infer changes in the spatial and temporal variability of iceberg calving from western Greenland. During the first third of the twentieth century the majority of modelled icebergs reaching 48°N derive from southern Greenland, while only after 1930 is the traditional perspective of a majority of such icebergs originating from Baffin Bay consistent with model results. Decadal-scale changes in the dominant regional sources are found, with oscillations between western Greenland and northern Baffin Bay. The latter origin was modelled to be most important in the last third of the twentieth century, although west Greenland sources have increased in importance in recent years. The model correctly reproduces the pronounced late spring peak in flux at 48°N for southern Greenland icebergs, but has an approximately six month offset for icebergs from Baffin Bay, most likely due to resolution issues leading to model icebergs not being delayed in shallow coastal waters, whereas in reality they may be grounded for some time or trapped in coastal sea-ice. © 2015 The Authors. |
format |
Article in Journal/Newspaper |
author |
Wilton, David j. Bigg, Grant R. Hanna, Edward |
author_facet |
Wilton, David j. Bigg, Grant R. Hanna, Edward |
author_sort |
Wilton, David j. |
title |
Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge |
title_short |
Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge |
title_full |
Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge |
title_fullStr |
Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge |
title_full_unstemmed |
Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge |
title_sort |
modelling twentieth century global ocean circulation and iceberg flux at 48°n: implications for west greenland iceberg discharge |
publisher |
Elsevier Ltd |
publishDate |
2015 |
url |
https://eprints.lincoln.ac.uk/id/eprint/25976/ https://eprints.lincoln.ac.uk/id/eprint/25976/1/1-s2.0-S007966111500155X-main.pdf https://doi.org/10.1016/j.pocean.2015.07.003 |
geographic |
Newfoundland Baffin Bay Greenland |
geographic_facet |
Newfoundland Baffin Bay Greenland |
genre |
Baffin Bay Baffin Bay Baffin Greenland Newfoundland North Atlantic Sea ice |
genre_facet |
Baffin Bay Baffin Bay Baffin Greenland Newfoundland North Atlantic Sea ice |
op_relation |
https://eprints.lincoln.ac.uk/id/eprint/25976/1/1-s2.0-S007966111500155X-main.pdf Wilton, David j., Bigg, Grant R. and Hanna, Edward (2015) Modelling twentieth century global ocean circulation and iceberg flux at 48°N: Implications for west Greenland iceberg discharge. Progress in Oceanography, 138 (A). pp. 194-210. ISSN 0079-6611 doi:10.1016/j.pocean.2015.07.003 |
op_rights |
cc_by4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.pocean.2015.07.003 |
container_title |
Progress in Oceanography |
container_volume |
138 |
container_start_page |
194 |
op_container_end_page |
210 |
_version_ |
1766365289766715392 |