Timing and structure of the 8.2 kyr B.P. event inferred from δ18 O records of stalagmites from China, Oman, and Brazil
Oxygen isotope records of stalagmites from China and Oman reveal a weak summer monsoon event, with a double-plunging struc- ture, that started 8.21 ± 0.02 kyr B.P. An identical but antiphased pattern is also evident in two stalagmite records from eastern Brazil, indicating that the South American Su...
| Main Authors: | , , |
|---|---|
| Format: | Text |
| Language: | unknown |
| Published: |
Digital Commons @ University of South Florida
2009
|
| Subjects: | |
| Online Access: | https://digitalcommons.usf.edu/kip_articles/5403 https://doi.org/10.1130/G30126A |
| Summary: | Oxygen isotope records of stalagmites from China and Oman reveal a weak summer monsoon event, with a double-plunging struc- ture, that started 8.21 ± 0.02 kyr B.P. An identical but antiphased pattern is also evident in two stalagmite records from eastern Brazil, indicating that the South American Summer Monsoon was intensi- fied during the 8.2 kyr B.P. event. These records demonstrate that the event was of global extent and synchronous within dating errors of <50 years. In comparison with recent model simulations, it is plau- sible that the 8.2 kyr B.P. event can be tied in changes of the Atlan- tic Meridional Overturning Circulation triggered by a glacial lake draining event. This, in turn, affected North Atlantic climate and lati- tudinal position of the Intertropical Convergence Zone, resulting in the observed low-latitude monsoonal precipitation patterns. |
|---|