 |
| Titel |
Tropical vegetation response to Heinrich Event 1 as simulated with the UVic ESCM and CCSM3 |
| VerfasserIn |
D. Handiani, A. Paul, M. Prange, U. Merkel, L. Dupont, X. Zhang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 4 ; Nr. 9, no. 4 (2013-07-31), S.1683-1696 |
| Datensatznummer |
250018100
|
| Publikation (Nr.) |
 copernicus.org/cp-9-1683-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| We investigated changes in tropical climate and vegetation cover associated
with abrupt climate change during Heinrich Event 1 (HE1, ca. 17.5 ka BP)
using two different global climate models: the University of Victoria Earth
System-Climate Model (UVic ESCM) and the Community Climate System Model
version 3 (CCSM3). Tropical South American and African pollen records
suggest that the cooling of the North Atlantic Ocean during HE1 influenced
the tropics through a southward shift of the rain belt. In this study, we
simulated the HE1 by applying a freshwater perturbation to the North
Atlantic Ocean. The resulting slowdown of the Atlantic Meridional
Overturning Circulation was followed by a temperature seesaw between the
Northern and Southern Hemispheres, as well as a southward shift of the
tropical rain belt. The shift and the response pattern of the tropical
vegetation around the Atlantic Ocean were more pronounced in the CCSM3 than
in the UVic ESCM simulation. For tropical South America, opposite changes in
tree and grass cover were modeled around 10° S in the CCSM3
but not in the UVic ESCM. In tropical Africa, the grass cover increased and
the tree cover decreased around 15° N in the UVic ESCM and
around 10° N in the CCSM3. In the CCSM3 model, the tree and
grass cover in tropical Southeast Asia responded to the abrupt climate
change during the HE1, which could not be found in the UVic ESCM. The biome
distributions derived from both models corroborate findings from pollen
records in southwestern and equatorial western Africa as well as
northeastern Brazil. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|