| Title | Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation |
| Authors | Otto-Bliesner, Bette L. Russell, James M. Clark, Peter U. Liu, Zhengyu Overpeck, Jonathan T. Konecky, Bronwen deMenocal, Peter Nicholson, Sharon E. He, Feng Lu, Zhengyao |
| Affiliation | Natl Ctr Atmospher Res, Climate & Global Dynam Div, Boulder, CO 80307 USA. Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA. Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA. Univ Wisconsin, Ctr Climat Res, Madison, WI 53706 USA. Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA. Peking Univ, Sch Phys, Lab Climate Ocean & Atmosphere Studies, Beijing 100871, Peoples R China. Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA. Univ Arizona, Inst Environm, Tucson, AZ 85721 USA. Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA. Columbia Univ, Dept Earth & Environm Sci, New York, NY 10027 USA. Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA. Natl Ctr Atmospher Res, Climate & Global Dynam Div, POB 3000, Boulder, CO 80307 USA. |
| Keywords | LATE PLEISTOCENE HUMID PERIOD CLIMATE CHANGES ATLANTIC-OCEAN CIRCULATION EVOLUTION BP HOLOCENE MONSOON FLUCTUATIONS |
| Issue Date | 2014 |
| Publisher | science |
| Citation | SCIENCE.2014,346,(6214),1223-1227. |
| Abstract | During the last deglaciation, wetter conditions developed abruptly similar to 14,700 years ago in southeastern equatorial and northern Africa and continued into the Holocene. Explaining the abrupt onset and hemispheric coherence of this early African Humid Period is challenging due to opposing seasonal insolation patterns. In this work, we use a transient simulation with a climate model that provides a mechanistic understanding of deglacial tropical African precipitation changes. Our results show that meltwater-induced reduction in the Atlantic meridional overturning circulation (AMOC) during the early deglaciation suppressed precipitation in both regions. Once the AMOC reestablished, wetter conditions developed north of the equator in response to high summer insolation and increasing greenhouse gas (GHG) concentrations, whereas wetter conditions south of the equator were a response primarily to the GHG increase. |
| URI | http://hdl.handle.net/20.500.11897/387734 |
| ISSN | 0036-8075 |
| DOI | 10.1126/science.1259531 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 |
