| |
| |
|
|
|
|
| |
 |
Modern and past processes of ocean-atmosphere-climate interactions in the low-latitude western Pacific and Indian Ocean
|
| |
|
|
The Neogene Warmth of the Western Pacific Warm Pool
Wednesday 9th @ 1050-1110, Conference Room 1
Yige Zhang* , Texas A&M University
Xiaoqing Liu, Texas A&M University
Presenter Email: yige.zhang@tamu.edu |
| Establishing long-term sea surface temperature (SST) records from the western equatorial Pacific is critical for us to understand the evolution of the western warm pool (WPWP), the warmest and largest surface water body on Earth. However, such records are scarce due to the limited availability of high-quality samples and reliable proxies. Benefited from the sediments retrieved by a recent IODP Expedition (363), here we report multi-proxy (TEX86 and Uk'37), multi-site (U1482, U1488, U1490, and 803) SST reconstructions of the WPWP since the mid-late Miocene. The SSTs show a clear cooling trend in the late Miocene - Pliocene, consistent with the previous TEX86-derived SSTs from Sites 806, 1143 and 796, and the seawater Mg/Ca-adjusted Mg/Ca-based SSTs. The 7-5 Ma cooling, however, was much milder in the WPWP relative to the middle and high latitudes, which implies major changes of the meridional temperature gradients. Climate models were then used to explore the relationship between increased temperature gradients and the intensification of deep-water upwelling and the "biogenic bloom" seen in many parts of the world's ocean. |
|
|
|
|
|
|
|
|