Simulation of the global bio-geophysical interactions during the Last Glacial Maximum |
| |
| Authors: | C Kubatzki M Claussen |
| |
| Institution: | (1) Potsdam-Institut für Klimafolgenforschung, Postfach 601203, D-14412 Potsdam, Germany E-mail: kubi@pik-potsdam.de, DE |
| |
| Abstract: | The bio-geophysical feedbacks during the Last Glacial Maximum (LGM, 21 000 y BP) are investigated by use of an asynchronously
coupled global atmosphere-biome model. It is found that the coupled model improves on the results of an atmosphere-only model
especially for the Siberian region, where the inclusion of vegetation-snow-albedo interaction leads to a better agreement
with geological reconstructions. Furthermore, it is shown that two stable solutions of the coupled model are possible under
LGM boundary conditions. The presence of bright sand desert at the beginning of a simulation leads to more extensive subtropical
deserts, whereas an initial global vegetation cover with forest, steppe, or dark desert results in a northward spread of vegetation
of up to some 1000 km, mainly in the western Sahara. These differences can be explained in the framework of Charney’s theory
of a “self-induction” of deserts through albedo enhancement. Moreover, it is found that the tropical easterly jet is strengthened
in the case of the “green” Sahara, which in turn leads to a modification of the Indian summer monsoon.
Received: 20 June 1997/Accepted: 14 January 1998 |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
