Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2
The relationship between leading atmospheric teleconnection patterns and Greenland Ice Sheet (GrIS) temperature, precipitation, and surface mass balance (SMB) are investigated for the last 36 summers (1979-2014) based on Modern-Era Retrospective analysis for Research and Applications version 2 reana...
Main Authors: | , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2016
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/7b31803h |
id |
ftcdlib:oai:escholarship.org/ark:/13030/qt7b31803h |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org/ark:/13030/qt7b31803h 2023-05-15T15:00:56+02:00 Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2 Lim, YK Schubert, SD Nowicki, SMJ Lee, JN Molod, AM Cullather, RI Zhao, B Velicogna, I 024002 - 024002 2016-02-01 application/pdf https://escholarship.org/uc/item/7b31803h unknown eScholarship, University of California qt7b31803h https://escholarship.org/uc/item/7b31803h public Environmental Research Letters, vol 11, iss 2 Greenland surface mass balance North Atlantic Oscillation East Atlantic pattern teleconnection Arctic climate Meteorology & Atmospheric Sciences article 2016 ftcdlib 2021-04-16T07:11:22Z The relationship between leading atmospheric teleconnection patterns and Greenland Ice Sheet (GrIS) temperature, precipitation, and surface mass balance (SMB) are investigated for the last 36 summers (1979-2014) based on Modern-Era Retrospective analysis for Research and Applications version 2 reanalyses. The results indicate that the negative phase of both the North Atlantic Oscillation (NAO) and Arctic Oscillation, associated with warm and dry conditions for the GrIS, lead to SMB decreases within 0-1 months. Furthermore, the positive phase of the East Atlantic (EA) pattern often lags the negative NAO, reflecting a dynamical linkage between these modes that acts to further enhance the warm and dry conditions over the GrIS, leading to a favorable environment for enhanced surface mass loss. The development of a strong negative NAO in combination with a strong positive EA in recent years leads to significantly larger GrIS warming compared to when the negative NAO occurs in combination with a negative or weak positive EA (0.69 K versus 0.13 K anomaly). During 2009 and 2011, weakened (as compared to conditions during the severe surface melt cases of 2010 and 2012) local high pressure blocking produced colder northerly flow over the GrIS inhibiting warming despite the occurrence of a strong negative NAO, reflecting an important role for the EA during those years. In particular, the EA acts with the NAO to enhance warming in 2010 and 2012, and weaken high pressure blocking in 2009 and 2011. In general, high pressure blocking primarily impacts the western areas of the GrIS via advective temperature increases, while changes in net surface radiative fluxes account for both western and eastern GrIS temperature changes. Article in Journal/Newspaper Arctic Greenland Ice Sheet North Atlantic North Atlantic oscillation University of California: eScholarship Arctic Greenland Merra ENVELOPE(12.615,12.615,65.816,65.816) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Greenland surface mass balance North Atlantic Oscillation East Atlantic pattern teleconnection Arctic climate Meteorology & Atmospheric Sciences |
spellingShingle |
Greenland surface mass balance North Atlantic Oscillation East Atlantic pattern teleconnection Arctic climate Meteorology & Atmospheric Sciences Lim, YK Schubert, SD Nowicki, SMJ Lee, JN Molod, AM Cullather, RI Zhao, B Velicogna, I Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2 |
topic_facet |
Greenland surface mass balance North Atlantic Oscillation East Atlantic pattern teleconnection Arctic climate Meteorology & Atmospheric Sciences |
description |
The relationship between leading atmospheric teleconnection patterns and Greenland Ice Sheet (GrIS) temperature, precipitation, and surface mass balance (SMB) are investigated for the last 36 summers (1979-2014) based on Modern-Era Retrospective analysis for Research and Applications version 2 reanalyses. The results indicate that the negative phase of both the North Atlantic Oscillation (NAO) and Arctic Oscillation, associated with warm and dry conditions for the GrIS, lead to SMB decreases within 0-1 months. Furthermore, the positive phase of the East Atlantic (EA) pattern often lags the negative NAO, reflecting a dynamical linkage between these modes that acts to further enhance the warm and dry conditions over the GrIS, leading to a favorable environment for enhanced surface mass loss. The development of a strong negative NAO in combination with a strong positive EA in recent years leads to significantly larger GrIS warming compared to when the negative NAO occurs in combination with a negative or weak positive EA (0.69 K versus 0.13 K anomaly). During 2009 and 2011, weakened (as compared to conditions during the severe surface melt cases of 2010 and 2012) local high pressure blocking produced colder northerly flow over the GrIS inhibiting warming despite the occurrence of a strong negative NAO, reflecting an important role for the EA during those years. In particular, the EA acts with the NAO to enhance warming in 2010 and 2012, and weaken high pressure blocking in 2009 and 2011. In general, high pressure blocking primarily impacts the western areas of the GrIS via advective temperature increases, while changes in net surface radiative fluxes account for both western and eastern GrIS temperature changes. |
format |
Article in Journal/Newspaper |
author |
Lim, YK Schubert, SD Nowicki, SMJ Lee, JN Molod, AM Cullather, RI Zhao, B Velicogna, I |
author_facet |
Lim, YK Schubert, SD Nowicki, SMJ Lee, JN Molod, AM Cullather, RI Zhao, B Velicogna, I |
author_sort |
Lim, YK |
title |
Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2 |
title_short |
Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2 |
title_full |
Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2 |
title_fullStr |
Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2 |
title_full_unstemmed |
Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: Insights from MERRA-2 |
title_sort |
atmospheric summer teleconnections and greenland ice sheet surface mass variations: insights from merra-2 |
publisher |
eScholarship, University of California |
publishDate |
2016 |
url |
https://escholarship.org/uc/item/7b31803h |
op_coverage |
024002 - 024002 |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Arctic Greenland Merra |
geographic_facet |
Arctic Greenland Merra |
genre |
Arctic Greenland Ice Sheet North Atlantic North Atlantic oscillation |
genre_facet |
Arctic Greenland Ice Sheet North Atlantic North Atlantic oscillation |
op_source |
Environmental Research Letters, vol 11, iss 2 |
op_relation |
qt7b31803h https://escholarship.org/uc/item/7b31803h |
op_rights |
public |
_version_ |
1766332989733601280 |