Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica
Despite the Amery Ice Shelf (AIS) being the third largest ice shelf in Antarctica, the seasonal variability of the physical processes involved in the AIS-ocean interaction remains undocumented and a robust observational, oceanographic-based basal melt rate estimate has been lacking. Here we use year...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://eprints.soton.ac.uk/411919/ https://eprints.soton.ac.uk/411919/1/Herraiz_Borreguero_et_al_2016_Journal_of_Geophysical_Research_Oceans.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:411919 2023-07-30T03:55:57+02:00 Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica Herraiz-Borreguero, L. Church, J.A. Allison, I. Peña-Molino, B. Coleman, R. Tomczak, M. Craven, M. 2016-07-17 text https://eprints.soton.ac.uk/411919/ https://eprints.soton.ac.uk/411919/1/Herraiz_Borreguero_et_al_2016_Journal_of_Geophysical_Research_Oceans.pdf en English eng https://eprints.soton.ac.uk/411919/1/Herraiz_Borreguero_et_al_2016_Journal_of_Geophysical_Research_Oceans.pdf Herraiz-Borreguero, L., Church, J.A., Allison, I., Peña-Molino, B., Coleman, R., Tomczak, M. and Craven, M. (2016) Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica. Journal of Geophysical Research: Oceans, 121 (7), 4946–4965. (doi:10.1002/2016JC011858 <http://dx.doi.org/10.1002/2016JC011858>). Article PeerReviewed 2016 ftsouthampton https://doi.org/10.1002/2016JC011858 2023-07-09T22:16:10Z Despite the Amery Ice Shelf (AIS) being the third largest ice shelf in Antarctica, the seasonal variability of the physical processes involved in the AIS-ocean interaction remains undocumented and a robust observational, oceanographic-based basal melt rate estimate has been lacking. Here we use year-long time series of water column temperature, salinity, and horizontal velocities measured along the ice shelf front from 2001 to 2002. Our results show strong zonal variations in the distribution of water masses along the ice shelf front: modified Circumpolar Deep Water (mCDW) arrives in the east, while in the west, Ice Shelf Water (ISW) and Dense Shelf Water (DSW) formed in the Mackenzie polynya dominate the water column. Baroclinic eddies, formed during winter deep convection (down to 1100 m), drive the inflow of DSW into the ice shelf cavity. Our net basal melt rate estimate is 57.4 ± 25.3 Gt yr−1 (1 ± 0.4 m yr−1), larger than previous modeling-based and glaciological-based estimates, and results from the inflow of DSW (0.52 ± 0.38 Sv; 1 Sv = 106 m3 s−1) and mCDW (0.22 ± 0.06 Sv) into the cavity. Our results highlight the role of the Mackenzie polynya in the seasonal exchange of water masses across the ice shelf front, and the role of the ISW in controlling the formation rate and thermohaline properties of DSW. These two processes directly impact on the ice shelf mass balance, and on the contribution of DSW/ISW to the formation of Antarctic Bottom Water. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf West Ice Shelf University of Southampton: e-Prints Soton Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic East Antarctica West Ice Shelf ENVELOPE(85.000,85.000,-67.000,-67.000) Journal of Geophysical Research: Oceans 121 7 4946 4965 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Despite the Amery Ice Shelf (AIS) being the third largest ice shelf in Antarctica, the seasonal variability of the physical processes involved in the AIS-ocean interaction remains undocumented and a robust observational, oceanographic-based basal melt rate estimate has been lacking. Here we use year-long time series of water column temperature, salinity, and horizontal velocities measured along the ice shelf front from 2001 to 2002. Our results show strong zonal variations in the distribution of water masses along the ice shelf front: modified Circumpolar Deep Water (mCDW) arrives in the east, while in the west, Ice Shelf Water (ISW) and Dense Shelf Water (DSW) formed in the Mackenzie polynya dominate the water column. Baroclinic eddies, formed during winter deep convection (down to 1100 m), drive the inflow of DSW into the ice shelf cavity. Our net basal melt rate estimate is 57.4 ± 25.3 Gt yr−1 (1 ± 0.4 m yr−1), larger than previous modeling-based and glaciological-based estimates, and results from the inflow of DSW (0.52 ± 0.38 Sv; 1 Sv = 106 m3 s−1) and mCDW (0.22 ± 0.06 Sv) into the cavity. Our results highlight the role of the Mackenzie polynya in the seasonal exchange of water masses across the ice shelf front, and the role of the ISW in controlling the formation rate and thermohaline properties of DSW. These two processes directly impact on the ice shelf mass balance, and on the contribution of DSW/ISW to the formation of Antarctic Bottom Water. |
format |
Article in Journal/Newspaper |
author |
Herraiz-Borreguero, L. Church, J.A. Allison, I. Peña-Molino, B. Coleman, R. Tomczak, M. Craven, M. |
spellingShingle |
Herraiz-Borreguero, L. Church, J.A. Allison, I. Peña-Molino, B. Coleman, R. Tomczak, M. Craven, M. Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica |
author_facet |
Herraiz-Borreguero, L. Church, J.A. Allison, I. Peña-Molino, B. Coleman, R. Tomczak, M. Craven, M. |
author_sort |
Herraiz-Borreguero, L. |
title |
Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica |
title_short |
Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica |
title_full |
Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica |
title_fullStr |
Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica |
title_full_unstemmed |
Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica |
title_sort |
basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the amery ice shelf calving front, east antarctica |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/411919/ https://eprints.soton.ac.uk/411919/1/Herraiz_Borreguero_et_al_2016_Journal_of_Geophysical_Research_Oceans.pdf |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(85.000,85.000,-67.000,-67.000) |
geographic |
Amery Amery Ice Shelf Antarctic East Antarctica West Ice Shelf |
geographic_facet |
Amery Amery Ice Shelf Antarctic East Antarctica West Ice Shelf |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf West Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf West Ice Shelf |
op_relation |
https://eprints.soton.ac.uk/411919/1/Herraiz_Borreguero_et_al_2016_Journal_of_Geophysical_Research_Oceans.pdf Herraiz-Borreguero, L., Church, J.A., Allison, I., Peña-Molino, B., Coleman, R., Tomczak, M. and Craven, M. (2016) Basal melt, seasonal water mass transformation, ocean current variability, and deep convection processes along the Amery Ice Shelf calving front, East Antarctica. Journal of Geophysical Research: Oceans, 121 (7), 4946–4965. (doi:10.1002/2016JC011858 <http://dx.doi.org/10.1002/2016JC011858>). |
op_doi |
https://doi.org/10.1002/2016JC011858 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
7 |
container_start_page |
4946 |
op_container_end_page |
4965 |
_version_ |
1772810364779495424 |