期刊
CLIMATE OF THE PAST
卷 9, 期 4, 页码 1911-1920出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/cp-9-1911-2013
关键词
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资金
- National Natural Science Foundation of China [41030212, 31100166, 41272007]
- 973 Project [2012CB821900]
- Foundation of the State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences [123106]
- West Light Foundation of the Chinese Academy of Sciences
- CAS 135 program [XTBG-F01]
- CAS Senior Visiting Professorship [2009S1-20]
- US NSF [EAR-0746105]
- Directorate For Geosciences
- Division Of Earth Sciences [0746105] Funding Source: National Science Foundation
The paleoclimate of the late Pliocene Longmen flora from Yongping County located at the southeastern boundary of the Qinghai-Tibet Plateau was reconstructed using two leaf-physiognomy-based methods, i.e., leaf margin analysis (LMA) and Climate Leaf Analysis Multivariate Program (CLAMP), to understand the paleoclimate condition and geographical pattern of monsoonal climate in southwestern China during the late Pliocene. The mean annual temperatures (MATs) estimated by LMA and CLAMP are 17.4 +/- 3.3 degrees C and 17.4 +/- 1.3 degrees C, respectively, compared with 15.9 degrees C at present. Meanwhile, the growing season precipitation (GSP) estimated by CLAMP is 1735.5 +/- 217.7mm in the Longmen flora, compared with 986.9mm nowadays. The calculated monsoon intensity index (MSI) of the Longmen flora is significantly lower than that of today. These results appear consistent with previous studies on the late Pliocene floras in western Yunnan based on the coexistence approach (CA), and further suggest that there was a slightly warmer and much wetter climate during the late Pliocene than the present climate in western Yunnan. We conclude that the significant change of the monsoonal climate might have been resulted from the continuous uplift of mountains in western Yunnan, as well as the intensification of the eastern Asian winter monsoon, both occurring concurrently in the post-Pliocene period.
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