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Atmospheric Precursors of and Response to Anomalous Arctic Sea Ice in CMIP5 Models

Michael KELLEHER - Personal Name
James SCREEN∗ - Personal Name

This study examines pre-industrial control simulations from CMIP5 climate models in an effort to better understand the
complex relationships between Arctic sea ice and the stratosphere, and between Arctic sea ice and cold winter temperatures
over Eurasia. We present normalized regressions of Arctic sea-ice area against several atmospheric variables at extended lead
and lag times. Statistically significant regressions are found at leads and lags, suggesting both atmospheric precursors of, and
responses to, low sea ice; but generally, the regressions are stronger when the atmosphere leads sea ice, including a weaker
polar stratospheric vortex indicated by positive polar cap height anomalies. Significant positive midlatitude eddy heat flux
anomalies are also found to precede low sea ice. We argue that low sea ice and raised polar cap height are both a response to
this enhanced midlatitude eddy heat flux. The so-called “warm Arctic, cold continents” anomaly pattern is present one to two
months before low sea ice, but is absent in the months following low sea ice, suggesting that the Eurasian cooling and low
sea ice are driven by similar processes. Lastly, our results suggest a dependence on the geographic region of low sea ice, with
low Barents–Kara Sea ice correlated with a weakened polar stratospheric vortex, whilst low Sea of Okhotsk ice is correlated
with a strengthened polar vortex. Overall, the results support a notion that the sea ice, polar stratospheric vortex and Eurasian
surface temperatures collectively respond to large-scale changes in tropospheric circulation.

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sea ice–atmosphere coupling
stratosphere–troposphere coupling
atmospheric circulation
Eurasian climate

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Atmospheric Precursors of and Response to Anomalous Arctic Sea Ice in CMIP5 Models

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NPP. 3509212D1000001

Atmospheric Precursors of and Response to Anomalous Arctic Sea Ice in CMIP5 Models

Michael KELLEHER - Personal NameJames SCREEN∗ - Personal Name

Series Title

Call Number

Publisher

Collation

Language

ISBN/ISSN

Classification

Content Type

Media Type

Carrier Type

Edition

Subject(s)

Specific Detail Info

Statement of Responsibility

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Michael KELLEHER - Personal Name
James SCREEN∗ - Personal Name