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| Titel |
The Role of Sea Ice Extent in High Latitude Greenhouse Gas Exchange |
| VerfasserIn |
F. J. W. Parmentier, T. R. Christensen |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063308
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| Zusammenfassung |
| The extensive loss of sea ice extent and alterations in the greenhouse gas exchange of the
Arctic are commonly portrayed as instances where the impact of global warming is most
pronounced. The impact of global warming is more apparent in the Arctic, since the
temperature increase at high latitudes is amplified compared to lower latitudes. Although
many previous studies on polar amplification focused on the underlying causes, including the
contribution of the sea ice albedo feedback, the effect of the disappearing sea ice extent has a
farther reach than warming alone. For example, changes in sea ice extent have also been
connected to an increase in atmospheric moisture, which in theory could lead to more
precipitation. Both temperature and precipitation have the potential to influence the
exchange of CO2 and methane in the terrestrial realm around the Arctic. At the same
time in the marine environment, biotic and abiotic processes are altering the air to
sea exchange of CO2 in response to the lower sea ice extent and warmer ocean
temperatures. It has also been suggested that the warming of ocean waters will influence
emissions from marine sediments, for example from methane hydrates. However, the
impact of the lower sea ice-extent on the future of high latitude greenhouse gas
exchange remains unclear, since a lack of circumpolar measurements makes it difficult
to draw conclusive connections. In this study, we aim to gather our knowledge
on the connections between sea ice extent and arctic greenhouse gas exchange
both in the terrestrial and marine systems, to more accurately predict the future
state of greenhouse gas exchange in an increasingly seasonally sea ice-free Arctic. |
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