 |
| Titel |
Sensitivity of the Atlantic Meridional Overturning Circulation to South Atlantic freshwater anomalies. |
| VerfasserIn |
A. A. Cimatoribus, M. den Toom, S. S. Drijfhout, H. A. Dijkstra |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060403
|
|
|
|
|
|
| Zusammenfassung |
| The sensitivity of the Atlantic Meridional Overturning Circulation (AMOC) to changes in
basin integrated net evaporation is highly dependent on the zonal salinity contrast
at the southern border of the Atlantic. Biases in the freshwater budget strongly
affect the stability of the AMOC in numerical models. The impact of these biases is
investigated in a coarse resolution global climate model, by adding local anomaly
patterns in the South Atlantic to the freshwater fluxes at the surface. These anomalies
alter the freshwater and salt transport by the different components of the ocean
circulation, affecting in particular the basin–scale salt–advection feedback, completely
changing the response of the AMOC to arbitrary perturbations. It is found that an
appropriate dipole anomaly pattern at the southern border of the Atlantic Ocean can
collapse the AMOC entirely even without a further hosing. The results suggest
a new view on the stability of the AMOC, controlled by processes in the South
Atlantic. |
|
|
|
|
|
|