The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice
The study analyzes the sensitivity and memory of the Southern Hemisphere coupled climate system to increased Antarctic sea ice (ASI), taking into account the persistence of the sea ice maxima in the current climate. The mechanisms involved in restoring the climate balance under two sets of experimen...
Published in: | Journal of Climate |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Meteorological Society
2015
|
Subjects: | |
Online Access: | https://centaur.reading.ac.uk/55084/ |
id |
ftunivreading:oai:centaur.reading.ac.uk:55084 |
---|---|
record_format |
openpolar |
spelling |
ftunivreading:oai:centaur.reading.ac.uk:55084 2024-06-23T07:47:16+00:00 The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice Parise, Claudia K. Pezzi, Luciano P. Hodges, Kevin I. Justino, Flavio 2015-12 https://centaur.reading.ac.uk/55084/ unknown American Meteorological Society Parise, C. K., Pezzi, L. P., Hodges, K. I. <https://centaur.reading.ac.uk/view/creators/90000463.html> and Justino, F. (2015) The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice. Journal of Climate, 28 (24). pp. 9642-9668. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI-D-14-00748.1 <https://doi.org/10.1175/JCLI-D-14-00748.1> Article PeerReviewed 2015 ftunivreading https://doi.org/10.1175/JCLI-D-14-00748.1 2024-06-11T15:04:44Z The study analyzes the sensitivity and memory of the Southern Hemisphere coupled climate system to increased Antarctic sea ice (ASI), taking into account the persistence of the sea ice maxima in the current climate. The mechanisms involved in restoring the climate balance under two sets of experiments, which differ in regard to their sea ice models, are discussed. The experiments are perturbed with extremes of ASI and integrated for 10 yr in a large 30-member ensemble. The results show that an ASI maximum is able to persist for 4 yr in the current climate, followed by a negative sea ice phase. The sea ice insulating effect during the positive phase reduces heat fluxes south of 60 8 S, while at the same time these are intensified at the sea ice edge. The increased air stability over the sea ice field strengthens the polar cell while the baroclinicity increases at midlatitudes. The mean sea level pressure is reduced (increased) over high latitudes (midlatitudes), typical of the southern annular mode (SAM) positive phase. The Southern Ocean (SO) becomes colder and fresher as the sea ice melts mainly through sea ice lateral melting, the consequence of which is an increase in the ocean stability by buoyancy and mixing changes. The climate sensitivity is triggered by the sea ice insulating process and the resulting freshwater pulse (fast response), while the climate equilibrium is restored by the heat stored in the SO subsurface layers (long response). It is concluded that the time needed for the ASI anomaly to be dissipated and/or melted is shortened by the sea ice dynamical processes. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean CentAUR: Central Archive at the University of Reading Antarctic Southern Ocean Journal of Climate 28 24 9642 9668 |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
unknown |
description |
The study analyzes the sensitivity and memory of the Southern Hemisphere coupled climate system to increased Antarctic sea ice (ASI), taking into account the persistence of the sea ice maxima in the current climate. The mechanisms involved in restoring the climate balance under two sets of experiments, which differ in regard to their sea ice models, are discussed. The experiments are perturbed with extremes of ASI and integrated for 10 yr in a large 30-member ensemble. The results show that an ASI maximum is able to persist for 4 yr in the current climate, followed by a negative sea ice phase. The sea ice insulating effect during the positive phase reduces heat fluxes south of 60 8 S, while at the same time these are intensified at the sea ice edge. The increased air stability over the sea ice field strengthens the polar cell while the baroclinicity increases at midlatitudes. The mean sea level pressure is reduced (increased) over high latitudes (midlatitudes), typical of the southern annular mode (SAM) positive phase. The Southern Ocean (SO) becomes colder and fresher as the sea ice melts mainly through sea ice lateral melting, the consequence of which is an increase in the ocean stability by buoyancy and mixing changes. The climate sensitivity is triggered by the sea ice insulating process and the resulting freshwater pulse (fast response), while the climate equilibrium is restored by the heat stored in the SO subsurface layers (long response). It is concluded that the time needed for the ASI anomaly to be dissipated and/or melted is shortened by the sea ice dynamical processes. |
format |
Article in Journal/Newspaper |
author |
Parise, Claudia K. Pezzi, Luciano P. Hodges, Kevin I. Justino, Flavio |
spellingShingle |
Parise, Claudia K. Pezzi, Luciano P. Hodges, Kevin I. Justino, Flavio The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice |
author_facet |
Parise, Claudia K. Pezzi, Luciano P. Hodges, Kevin I. Justino, Flavio |
author_sort |
Parise, Claudia K. |
title |
The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice |
title_short |
The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice |
title_full |
The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice |
title_fullStr |
The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice |
title_full_unstemmed |
The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice |
title_sort |
influence of sea ice dynamics on the climate sensitivity and memory to increased antarctic sea ice |
publisher |
American Meteorological Society |
publishDate |
2015 |
url |
https://centaur.reading.ac.uk/55084/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
Parise, C. K., Pezzi, L. P., Hodges, K. I. <https://centaur.reading.ac.uk/view/creators/90000463.html> and Justino, F. (2015) The influence of sea ice dynamics on the climate sensitivity and memory to increased Antarctic sea ice. Journal of Climate, 28 (24). pp. 9642-9668. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI-D-14-00748.1 <https://doi.org/10.1175/JCLI-D-14-00748.1> |
op_doi |
https://doi.org/10.1175/JCLI-D-14-00748.1 |
container_title |
Journal of Climate |
container_volume |
28 |
container_issue |
24 |
container_start_page |
9642 |
op_container_end_page |
9668 |
_version_ |
1802651365720195072 |