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Modern and past processes of ocean-atmosphere-climate interactions in the low-latitude western Pacific and Indian Ocean
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Reconstructing the upper ocean thermal structure in the western Philippine Sea over the past 700 kyr
Wednesday 9th @ 1530-1550, Conference Room 1
Qi Jia* , First Institute of Oceanography, State Oceanic Administration
Tiegang Li, First Institute of Oceanography, State Oceanic Administration
Zhifang Xiong, First Institute of Oceanography, State Oceanic Administration
Presenter Email: jiaqi0604@163.com |
| We present ¦Ä18O and Mg/Ca data of upper-thermocline dwelling planktonic foraminifera Pulleniatina obliquiloculata from the International Marine Global Change Study Program (IMAGES) Core MD06-3047B (17©b00.44'N, 124©b47.93'E, 2510 m water depth), located in the northwestern tropical Pacific Ocean. Then the thermocline temperature (TWT) and the differences between the sea surface temperature (SST) from our previous study and TWT records were estimated in order to discuss the changes in the upper ocean thermal structure in the northwestern tropical Pacific over the past 700 kyr. On glacial-interglacial timescale, we found that SST and TWT records show relatively different characters, such as, with earlier increase in TWT than SST during glacials. And our analysis of the records indicate smaller (larger) vertical thermal gradient and thus deeper (shallower) thermocline depth during glacials (interglacials) in the northwestern tropical Pacific. In addition, we also found a long-term change tendency of the vertical thermal gradient in our study area. And the variation of the East Asian Monsoon may be an important influencing factor for the changes in upper ocean thermal structure on glacial-interglacial and longer timescales. |
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