scholarly journals Stratospheric response to Arctic sea ice retreat and associated planetary wave propagation changes

2013 ◽  
Vol 65 (1) ◽  
pp. 19375 ◽  
Author(s):  
Ralf Jaiser ◽  
Klaus Dethloff ◽  
Dörthe Handorf
Keyword(s):  
Wave Propagation ◽  
Sea Ice ◽  
Planetary Wave ◽  
Arctic Sea Ice ◽  
Arctic Sea ◽  
Ice Retreat ◽  
Sea Ice Retreat ◽  
Planetary Wave Propagation

scholarly journals Extratropical Ocean Warming and Winter Arctic Sea Ice Cover since the 1990s

2015 ◽  
Vol 28 (14) ◽  
pp. 5510-5522 ◽  
Author(s):  
Fei Li ◽  
Huijun Wang ◽  
Yongqi Gao
Keyword(s):  
Heat Flux ◽  
Wave Propagation ◽  
Sea Ice ◽  
Planetary Wave ◽  
Polar Vortex ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Arctic Sea ◽  
Planetary Wave Propagation ◽  
Sst Anomalies

Abstract Despite the fact that the Arctic Oscillation (AO) has reached a more neutral state and a global-warming hiatus has occurred in winter since the late 1990s, the Arctic sea ice cover (ASIC) still shows a pronounced decrease. This study reveals a close connection (R = 0.5) between the extratropical sea surface temperature (ET-SST) and ASIC in winter from 1994 to 2013. In response to one positive (negative) unit of deviation in the ET-SST pattern, the ASIC decreases (increases) in the Barents–Kara Seas and Hudson Bay (the Baffin Bay and Bering Sea) by 100–400 km2. This relationship might be maintained because of the impact of warming extratropical oceans on the polar vortex. Positive SST anomalies in the midlatitudes of the North Pacific and Atlantic (around 40°N) strengthen the equatorward planetary wave propagation, whereas negative SST anomalies in the high latitudes weaken the upward planetary wave propagation from the lower troposphere to the stratosphere. The former indicates a strengthening of the poleward meridional eddy momentum flux, and the latter implies a weakening of the poleward eddy heat flux, which favors an intensified upper-level polar night jet and a colder polar vortex, implying a stronger-than-normal polar vortex. Consequently, an anomalous cyclone emerges over the eastern Arctic, limiting or encouraging the ASIC by modulating the mean meridional heat flux. A possible reason for the long-term changes in the relationship between the ET-SST and ASIC is also discussed.

scholarly journals Limitations of a coupled regional climate model in the reproduction of the observed Arctic sea-ice retreat

2012 ◽  
Vol 6 (2) ◽  
pp. 1269-1306 ◽  
Author(s):  
W. Dorn ◽  
K. Dethloff ◽  
A. Rinke
Keyword(s):  
Sea Ice ◽  
Climate Model ◽  
Regional Climate ◽  
Arctic Sea Ice ◽  
Ice Volume ◽  
Arctic Sea ◽  
Melting Period ◽  
Ice Retreat ◽  
Sea Ice Retreat ◽  
Model Variability

Abstract. The effects of internal model variability on the simulation of Arctic sea-ice extent and volume have been examined with the aid of a seven-member ensemble with a coupled regional climate model for the period 1948–2008. Beyond general weaknesses related to insufficient representation of feedback processes, it is found that the model's ability to reproduce observed summer sea-ice retreat depends mainly on two factors: the correct simulation of the atmospheric circulation during the summer months and the sea-ice volume at the beginning of the melting period. Since internal model variability shows its maximum during the summer months, the ability to reproduce the observed atmospheric summer circulation is limited. In addition, the atmospheric circulation during summer also significantly affects the sea-ice volume over the years, leading to a limited ability to start with reasonable sea-ice volume into the melting period. Furthermore, the sea-ice volume pathway shows notable decadal variability which amplitude varies among the ensemble members. The scatter is particularly large in periods when the ice volume increases, indicating limited skill in reproducing high-ice years.

scholarly journals Skillful seasonal forecasts of Arctic sea ice retreat and advance dates in a dynamical forecast system

2016 ◽  
Vol 43 (24) ◽  
pp. 12,457-12,465 ◽  
Author(s):  
M. Sigmond ◽  
M. C. Reader ◽  
G. M. Flato ◽  
W. J. Merryfield ◽  
A. Tivy
Keyword(s):  
Sea Ice ◽  
Arctic Sea Ice ◽  
Seasonal Forecasts ◽  
Forecast System ◽  
Arctic Sea ◽  
Ice Retreat ◽  
Sea Ice Retreat

scholarly journals The 2007 Bering Strait oceanic heat flux and anomalous Arctic sea-ice retreat

2010 ◽  
Vol 37 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
Rebecca A. Woodgate ◽  
Tom Weingartner ◽  
Ron Lindsay
Keyword(s):  
Heat Flux ◽  
Sea Ice ◽  
Arctic Sea Ice ◽  
Bering Strait ◽  
Oceanic Heat Flux ◽  
Arctic Sea ◽  
Ice Retreat ◽  
Sea Ice Retreat

scholarly journals Reexamination of Fram Strait sea ice export and its role in recently accelerated Arctic sea ice retreat

2019 ◽  
Vol 53 (3-4) ◽  
pp. 1823-1841 ◽  
Author(s):  
Jianfen Wei ◽  
Xiangdong Zhang ◽  
Zhaomin Wang
Keyword(s):  
Sea Ice ◽  
Arctic Sea Ice ◽  
Fram Strait ◽  
Arctic Sea ◽  
Ice Retreat ◽  
Sea Ice Retreat

scholarly journals Faster Arctic Sea Ice Retreat in CMIP5 than in CMIP3 due to Volcanoes

2016 ◽  
Vol 29 (24) ◽  
pp. 9179-9188 ◽  
Author(s):  
Erica Rosenblum ◽  
Ian Eisenman
Keyword(s):  
Sea Ice ◽  
Climate Models ◽  
Arctic Sea Ice ◽  
Sea Ice Extent ◽  
Arctic Sea ◽  
Volcanic Forcing ◽  
Global Mean Surface Temperature ◽  
Ice Retreat ◽  
Sea Ice Retreat ◽  
Global Mean

Abstract The downward trend in Arctic sea ice extent is one of the most dramatic signals of climate change during recent decades. Comprehensive climate models have struggled to reproduce this trend, typically simulating a slower rate of sea ice retreat than has been observed. However, this bias has been widely noted to have decreased in models participating in phase 5 of the Coupled Model Intercomparison Project (CMIP5) compared with the previous generation of models (CMIP3). Here simulations are examined from both CMIP3 and CMIP5. It is found that simulated historical sea ice trends are influenced by volcanic forcing, which was included in all of the CMIP5 models but in only about half of the CMIP3 models. The volcanic forcing causes temporary simulated cooling in the 1980s and 1990s, which contributes to raising the simulated 1979–2013 global-mean surface temperature trends to values substantially larger than observed. It is shown that this warming bias is accompanied by an enhanced rate of Arctic sea ice retreat and hence a simulated sea ice trend that is closer to the observed value, which is consistent with previous findings of an approximately linear relationship between sea ice extent and global-mean surface temperature. Both generations of climate models are found to simulate Arctic sea ice that is substantially less sensitive to global warming than has been observed. The results imply that much of the difference in Arctic sea ice trends between CMIP3 and CMIP5 occurred because of the inclusion of volcanic forcing, rather than improved sea ice physics or model resolution.

The impact of an intense summer cyclone on 2012 Arctic sea ice retreat

2013 ◽  
Vol 40 (4) ◽  
pp. 720-726 ◽  
Author(s):  
Jinlun Zhang ◽  
Ron Lindsay ◽  
Axel Schweiger ◽  
Michael Steele
Keyword(s):  
Sea Ice ◽  
Arctic Sea Ice ◽  
Arctic Sea ◽  
Ice Retreat ◽  
Sea Ice Retreat ◽  
The Impact
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