Sahel megadroughts triggered by glacial slowdowns of Atlantic meridional overturning

被引：202

作者：

Mulitza, Stefan ^{[1
]}

Prange, Matthias ^{[1
]}

Stuut, Jan Berend ^{[1
]}

Zabel, Matthias ^{[1
]}

von Dobeneck, Tilo ^{[1
]}

Itambi, Achakie C. ^{[1
]}

Nizou, Jean ^{[1
]}

Schulz, Michael ^{[1
]}

Wefer, Gerold ^{[1
]}

机构：

[1] Univ Bremen, MARUM, D-28359 Bremen, Germany

来源：

PALEOCEANOGRAPHY | 2008年 / 23卷 / 04期

关键词：

D O I：

10.1029/2008PA001637

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The influence of the large-scale ocean circulation on Sahel rainfall is elusive because of the shortness of the observation record. We reconstructed the history of eolian and fluvial sedimentation on the continental slope off Senegal during the past 57,000 years. Our data show that abrupt onsets of arid conditions in the West African Sahel were linked to cold North Atlantic sea surface temperatures during times of reduced meridional overturning circulation associated with Heinrich Stadials. Climate modeling suggests that this drying is induced by a southward shift of the West African monsoon trough in conjunction with an intensification and southward expansion of the midtropospheric African Easterly Jet.

引用

页数：11

共 63 条

[1] One-to-one coupling of glacial climate variability in Greenland and Antarctica [J].

Barbante, C. ;

Barnola, J. -M. ;

Becagli, S. ;

Beer, J. ;

Bigler, M. ;

Boutron, C. ;

Blunier, T. ;

Castellano, E. ;

Cattani, O. ;

Chappellaz, J. ;

Dahl-Jensen, D. ;

Debret, M. ;

Delmonte, B. ;

Dick, D. ;

Falourd, S. ;

Faria, S. ;

Federer, U. ;

Fischer, H. ;

Freitag, J. ;

Frenzel, A. ;

Fritzsche, D. ;

Fundel, F. ;

Gabrielli, P. ;

Gaspari, V. ;

Gersonde, R. ;

Graf, W. ;

Grigoriev, D. ;

Hamann, I. ;

Hansson, M. ;

Hoffmann, G. ;

Hutterli, M. A. ;

Huybrechts, P. ;

Isaksson, E. ;

Johnsen, S. ;

Jouzel, J. ;

Kaczmarska, M. ;

Karlin, T. ;

Kaufmann, P. ;

Kipfstuhl, S. ;

Kohno, M. ;

Lambert, F. ;

Lambrecht, Anja ;

Lambrecht, Astrid ;

Landais, A. ;

Lawer, G. ;

Leuenberger, M. ;

Littot, G. ;

Loulergue, L. ;

Luethi, D. ;

Maggi, V. .

NATURE, 2006, 444 (7116) :195-198

[2]

Bonan GB, 2002, J CLIMATE, V15, P3123, DOI 10.1175/1520-0442(2002)015&lt

[3]

3123:TLSCOT&gt

[4]

2.0.CO

[5]

[6] Results of PMIP2 coupled simulations of the Mid-Holocene and Last Glacial Maximum - Part 2: feedbacks with emphasis on the location of the ITCZ and mid- and high latitudes heat budget [J].

Braconnot, P. ;

Otto-Bliesner, B. ;

Harrison, S. ;

Joussaume, S. ;

Peterchmitt, J.-Y. ;

Abe-Ouchi, A. ;

Crucifix, M. ;

Driesschaert, E. ;

Fichefet, Th. ;

Hewitt, C. D. ;

Kageyama, M. ;

Kitoh, A. ;

Loutre, M.-F. ;

Marti, O. ;

Merkel, U. ;

Ramstein, G. ;

Valdes, P. ;

Weber, L. ;

Yu, Y. ;

Zhao, Y. .

CLIMATE OF THE PAST, 2007, 3 (02) :279-296

[7] DYNAMICS OF DESERTS AND DROUGHT IN SAHEL [J].

CHARNEY, JG .

QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, 1975, 101 (428) :193-202

[8] Climate change - Tropical flip-flop connections [J].

Chiang, JCH ;

Koutavas, A .

NATURE, 2004, 432 (7018) :684-685

[9] QUESTIONS RELATIVE TO ITCZ MIGRATIONS OVER THE TROPICAL ATLANTIC-OCEAN, SEA-SURFACE TEMPERATURE AND SENEGAL RIVER RUNOFF [J].

CITEAU, J ;

FINAUD, L ;

CAMMAS, JP ;

DEMARCQ, H .

METEOROLOGY AND ATMOSPHERIC PHYSICS, 1989, 41 (04) :181-190

[10] Coupled model simulations of the west African monsoon system: Twentieth- and Twenty-First-century simulations [J].

Cook, Kerry H. ;

Vizy, Edward K. .

JOURNAL OF CLIMATE, 2006, 19 (15) :3681-3703

← 1 2 3 4 5 6 7 →