NIGPAS OpenIR  > 中国科学院南京地质古生物研究所
Leaf physiognomy and climate: Are monsoon systems different?
Jacques, Frederic M. B.1,2; Su, Tao1,3; Spicer, Robert A.4,5; Xing, Yaowu1,6; Huang, Yongjiang1,3; Wang, Weiming (王伟铭)2; Zhou, Zhekun1,6

Our understanding of past climatic changes depends on our ability to obtain reliable palaeoclimate reconstructions. Climate Leaf Analysis Multivariate Program (CLAMP) uses the physiognomy of woody dicot leaf assemblages to quantitatively reconstruct terrestrial palaeoclimates. However, the present calibrations do not always allow us to reconstruct correctly the climate of some regions due to differing palaeofloristic histories. Present calibrations are also inappropriate for regions experiencing strong monsoon regimes. To help solve this problem, we have established a new calibration that can accommodate monsoonal climates in Asia. Our new calibration is based on the Physg3brcAZ dataset with 45 new Chinese sites added. These Chinese sites are taken from humid to mesic vegetations across China, and all are influenced by monsoonal conditions to some extent. They plot in a distinct part of physiognomic space, whether they are analysed as passive or active samples. The standard deviations for the new monsoonal calibration (1.25 degrees C for MAT and 217.7 mm for GSP) are in the same range as those observed for previous calibrations. The new monsoonal calibration was tested using a cross validation procedure. The estimates derived from the new monsoonal calibration (PhysgAsia1) for the Chinese sites are more accurate than those obtained from the Physg3brcAZ calibration, especially for the moisture related parameters. The mean absolute error for GSP of the Chinese sites is 294.6 mm in the new monsoonal calibration, whereas it was 1609.6 mm in the Physg3brcAZ calibration. Results for the three wettest months and three driest months are also more accurate and precise, which allows us to study the seasonality of the precipitation, and hence the monsoon. The new monsoonal calibration also gives accurate results for enthalpy reconstruction. Enthalpy is a parameter that is used for palaeoaltimetry, the new calibration is therefore useful for studies of land surface height changes in China, height changes which in turn can affect the strength of the monsoon. The new monsoonal calibration was tested on two fossil sites from the Late Miocene of southwestern China, namely the Lincang and Xiaolongtan palaeofloras. A comparison of results from the new monsoonal calibration and the Physg3brcAZ calibration shows that there is no strong difference in temperature estimates for the two calibrations, but there is a strong difference in the moisture related parameters. The use of this new monsoonal calibration is recommended for palaeoclimate reconstructions in China. (C) 2010 Elsevier B.V. All rights reserved.

KeywordAsia China Clamp Leaf Physiognomy Monsoon Palaeoclimate
WOS KeywordAsian Monsoon ; China ; Clamp ; Temperature ; Variability ; Sensitivity ; Parameters ; Oligocene ; America ; Tibet
Funding ProjectNational Natural Science Foundation of China (NSFC)[41030212] ; National Natural Science Foundation of China (NSFC)[30970206] ; CAS[2009YB1-13] ; CAS[KZCX2-YW-155] ; CAS[2009S1-20] ; NSFC[40950110338]
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000288934400005
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; CAS ; NSFC
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Document Type期刊论文
Corresponding AuthorZhou, Zhekun
Affiliation1.CAS, Key Lab Biodivers & Biogeog, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China
2.Chinese Acad Sci, Dept Palaeobot & Palynol, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Open Univ, Dept Earth & Environm Sci, Ctr Earth Planetary Space & Astron Res, Milton Keynes MK7 6AA, Bucks, England
5.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China
6.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Jacques, Frederic M. B.,Su, Tao,Spicer, Robert A.,et al. Leaf physiognomy and climate: Are monsoon systems different?[J]. GLOBAL AND PLANETARY CHANGE,2011,76(1-2):56-62.
APA Jacques, Frederic M. B..,Su, Tao.,Spicer, Robert A..,Xing, Yaowu.,Huang, Yongjiang.,...&Zhou, Zhekun.(2011).Leaf physiognomy and climate: Are monsoon systems different?.GLOBAL AND PLANETARY CHANGE,76(1-2),56-62.
MLA Jacques, Frederic M. B.,et al."Leaf physiognomy and climate: Are monsoon systems different?".GLOBAL AND PLANETARY CHANGE 76.1-2(2011):56-62.
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