Simulated Atmospheric Response to Regional and Pan-Arctic Sea Ice Loss
- 4 May 2017
- journal article
- Published by American Meteorological Society in Journal of Climate
- Vol. 30 (11), 3945-3962
- https://doi.org/10.1175/jcli-d-16-0197.1
Abstract
The loss of Arctic sea ice is already having profound environmental, societal, and ecological impacts locally. A highly uncertain area of scientific research, however, is whether such Arctic change has a tangible effect on weather and climate at lower latitudes. There is emerging evidence that the geographical location of sea ice loss is critically important in determining the large-scale atmospheric circulation response and associated midlatitude impacts. However, such regional dependencies have not been explored in a thorough and systematic manner. To make progress on this issue, this study analyzes ensemble simulations with an atmospheric general circulation model prescribed with sea ice loss separately in nine regions of the Arctic, to elucidate the distinct responses to regional sea ice loss. The results suggest that in some regions, sea ice loss triggers large-scale dynamical responses, whereas in other regions sea ice loss induces only local thermodynamical changes. Sea ice loss in the Barents–Kara Seas is unique in driving a weakening of the stratospheric polar vortex, followed in time by a tropospheric circulation response that resembles the North Atlantic Oscillation. For October–March, the largest spatial-scale responses are driven by sea ice loss in the Barents–Kara Seas and the Sea of Okhotsk; however, different regions assume greater importance in other seasons. The atmosphere responds very differently to regional sea ice losses than to pan-Arctic sea ice loss, and the response to pan-Arctic sea ice loss cannot be obtained by the linear addition of the responses to regional sea ice losses. The results imply that diversity in past studies of the simulated response to Arctic sea ice loss can be partly explained by the different spatial patterns of sea ice loss imposed.Keywords
Funding Information
- Natural Environment Research Council (NE/J019585/1)
- Natural Environment Research Council (NE/M006123/1)
This publication has 38 references indexed in Scilit:
- The Atmospheric Response to Three Decades of Observed Arctic Sea Ice LossJournal of Climate, 2013
- Reconstructed changes in Arctic sea ice over the past 1,450 yearsNature, 2011
- The HadGEM2 family of Met Office Unified Model climate configurationsGeoscientific Model Development, 2011
- The Role of Linear Interference in the Annular Mode Response to Extratropical Surface ForcingJournal of Climate, 2010
- A link between reduced Barents‐Kara sea ice and cold winter extremes over northern continentsJournal of Geophysical Research: Atmospheres, 2010
- Tropospheric Precursors of Anomalous Northern Hemisphere Stratospheric Polar VorticesJournal of Climate, 2010
- The Seasonal Atmospheric Response to Projected Arctic Sea Ice Loss in the Late Twenty-First CenturyJournal of Climate, 2010
- Influence of low Arctic sea‐ice minima on anomalously cold Eurasian wintersGeophysical Research Letters, 2009
- Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth centuryJournal of Geophysical Research: Atmospheres, 2003
- Influence of Okhotsk sea‐ice extent on atmospheric circulationGeophysical Research Letters, 1996