Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice
The Arctic marine environment is undergoing a transition from thick multi-year to first-year sea-ice cover with coincident lengthening of the melt season. Such changes are evident in the Baffin Bay-Davis Strait-Labrador Sea (BDL) region where melt onset has occurred ~8 days decade−1 earlier from 197...
Main Authors: | , , , , , , , |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
Cambridge University Press
2021
|
Subjects: | |
Online Access: | https://digital.library.txstate.edu/handle/10877/13354 |
id |
fttexasstate:oai:digital.library.txstate.edu:10877/13354 |
---|---|
record_format |
openpolar |
spelling |
fttexasstate:oai:digital.library.txstate.edu:10877/13354 2023-08-20T03:59:47+02:00 Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice Ballinger, Thomas J. Hanna, Edward Hall, Richard J. Cropper, Thomas E. Miller, Jeffrey Ribergaard, Mads H. Overland, James E. Hoyer, Jacob 2021-04-09T19:51:53Z Text 10 pages 1 file (.pdf) application/pdf https://digital.library.txstate.edu/handle/10877/13354 en eng Cambridge University Press Ballinger, T. J., Hanna, E., Hall, R. J., Cropper, T. E., Miller, J., Ribergaard, M. H., Overland, J. E., & Høyer, J. L. (2018). Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice. Annals of Glaciology, 59(76), pp. 181-190. https://digital.library.txstate.edu/handle/10877/13354 © 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. Annals of Glaciology, 2018, Vol. 59, No. 76, pp. 181-190. atmosphere interactions ice interactions ocean interactions climate change sea ice Geography and Environmental Studies publishedVersion 2021 fttexasstate 2023-07-29T22:05:58Z The Arctic marine environment is undergoing a transition from thick multi-year to first-year sea-ice cover with coincident lengthening of the melt season. Such changes are evident in the Baffin Bay-Davis Strait-Labrador Sea (BDL) region where melt onset has occurred ~8 days decade−1 earlier from 1979 to 2015. A series of anomalously early events has occurred since the mid-1990s, overlapping a period of increased upper-air ridging across Greenland and the northwestern North Atlantic. We investigate an extreme early melt event observed in spring 2013. (~6σ below the 1981–2010 melt climatology), with respect to preceding sub-seasonal mid-tropospheric circulation conditions as described by a daily Greenland Blocking Index (GBI). The 40-days prior to the 2013 BDL melt onset are characterized by a persistent, strong 500 hPa anticyclone over the region (GBI >+1 on >75% of days). This circulation pattern advected warm air from northeastern Canada and the northwestern Atlantic poleward onto the thin, first-year sea ice and caused melt ~50 days earlier than normal. The episodic increase in the ridging atmospheric pattern near western Greenland as in 2013, exemplified by large positive GBI values, is an important recent process impacting the atmospheric circulation over a North Atlantic cryosphere undergoing accelerated regional climate change. Geography Other/Unknown Material Annals of Glaciology Arctic Baffin Bay Baffin Bay Baffin Climate change Davis Strait Greenland Labrador Sea North Atlantic Sea ice Texas State University: Digital Collections Repository Arctic Baffin Bay Canada Greenland |
institution |
Open Polar |
collection |
Texas State University: Digital Collections Repository |
op_collection_id |
fttexasstate |
language |
English |
topic |
atmosphere interactions ice interactions ocean interactions climate change sea ice Geography and Environmental Studies |
spellingShingle |
atmosphere interactions ice interactions ocean interactions climate change sea ice Geography and Environmental Studies Ballinger, Thomas J. Hanna, Edward Hall, Richard J. Cropper, Thomas E. Miller, Jeffrey Ribergaard, Mads H. Overland, James E. Hoyer, Jacob Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice |
topic_facet |
atmosphere interactions ice interactions ocean interactions climate change sea ice Geography and Environmental Studies |
description |
The Arctic marine environment is undergoing a transition from thick multi-year to first-year sea-ice cover with coincident lengthening of the melt season. Such changes are evident in the Baffin Bay-Davis Strait-Labrador Sea (BDL) region where melt onset has occurred ~8 days decade−1 earlier from 1979 to 2015. A series of anomalously early events has occurred since the mid-1990s, overlapping a period of increased upper-air ridging across Greenland and the northwestern North Atlantic. We investigate an extreme early melt event observed in spring 2013. (~6σ below the 1981–2010 melt climatology), with respect to preceding sub-seasonal mid-tropospheric circulation conditions as described by a daily Greenland Blocking Index (GBI). The 40-days prior to the 2013 BDL melt onset are characterized by a persistent, strong 500 hPa anticyclone over the region (GBI >+1 on >75% of days). This circulation pattern advected warm air from northeastern Canada and the northwestern Atlantic poleward onto the thin, first-year sea ice and caused melt ~50 days earlier than normal. The episodic increase in the ridging atmospheric pattern near western Greenland as in 2013, exemplified by large positive GBI values, is an important recent process impacting the atmospheric circulation over a North Atlantic cryosphere undergoing accelerated regional climate change. Geography |
format |
Other/Unknown Material |
author |
Ballinger, Thomas J. Hanna, Edward Hall, Richard J. Cropper, Thomas E. Miller, Jeffrey Ribergaard, Mads H. Overland, James E. Hoyer, Jacob |
author_facet |
Ballinger, Thomas J. Hanna, Edward Hall, Richard J. Cropper, Thomas E. Miller, Jeffrey Ribergaard, Mads H. Overland, James E. Hoyer, Jacob |
author_sort |
Ballinger, Thomas J. |
title |
Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice |
title_short |
Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice |
title_full |
Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice |
title_fullStr |
Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice |
title_full_unstemmed |
Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice |
title_sort |
anomalous blocking over greenland preceded the 2013 extreme early melt of local sea ice |
publisher |
Cambridge University Press |
publishDate |
2021 |
url |
https://digital.library.txstate.edu/handle/10877/13354 |
geographic |
Arctic Baffin Bay Canada Greenland |
geographic_facet |
Arctic Baffin Bay Canada Greenland |
genre |
Annals of Glaciology Arctic Baffin Bay Baffin Bay Baffin Climate change Davis Strait Greenland Labrador Sea North Atlantic Sea ice |
genre_facet |
Annals of Glaciology Arctic Baffin Bay Baffin Bay Baffin Climate change Davis Strait Greenland Labrador Sea North Atlantic Sea ice |
op_source |
Annals of Glaciology, 2018, Vol. 59, No. 76, pp. 181-190. |
op_relation |
Ballinger, T. J., Hanna, E., Hall, R. J., Cropper, T. E., Miller, J., Ribergaard, M. H., Overland, J. E., & Høyer, J. L. (2018). Anomalous blocking over Greenland preceded the 2013 extreme early melt of local sea ice. Annals of Glaciology, 59(76), pp. 181-190. https://digital.library.txstate.edu/handle/10877/13354 |
op_rights |
© 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. |
_version_ |
1774715655098990592 |