 |
| Titel |
Analysis of wind driven sea ice export through Fram Strait using a high resolution climate model |
| VerfasserIn |
Jan van Angelen, Michiel van den Broeke, Ron Kwok |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048535
|
|
|
|
|
|
| Zusammenfassung |
| The forcing of wind driven sea ice export from the Arctic Ocean through Fram Strait is
analyzed for the period 1979-2007, using output of a high-resolution regional atmospheric
climate model. By explicitly calculating the components of the atmospheric momentum
budget, we show that not synoptic, but mainly thermal wind forcing (THW) causes the
persistent northerly flow over Fram Strait. THW results from horizontal temperature
gradients in the atmospheric boundary layer (ABL). In this case, it is caused by the cold ABL
over the sea-ice covered ocean along the east-Greenland coast and the relatively warmer ABL
over the ice-free Atlantic Ocean further east. Over the years we find a negative trend in the
THW, associated with a decrease in the large scale sea ice extent over the Greenland Sea.
Although the large scale synoptic forcing (LSC) is on average smaller than THW, year to
year variations in LSC are larger and strongly correlated with the sea ice area flux
through Fram Strait (R = 0.82). A small positive trend exists for LSC in the 28 year
period. |
|
|
|
|
|
|