WINTER DROUGHT VARIATIONS BASED ON TREE-RING DATA IN GAOLIGONG MOUNTAIN,
NORTHWESTERN YUNNAN, CHINA, A. D. 1795–2004
ZongShan Li1, 2*, Chunming Shi1, 3, Yongbo Liu1
, Jinlong Zhang1, Qibing Zhang1 and Keping
developed two tree ring-width chronologies of coniferous species (Tsuga
dumosa (D.Don) Eichler and Abies georgei Orr) in Gaoligong
Mountain, northwestern Yunnan, China. Although the two chronologies come
from different species, significant correlation existed between the two
chronologies (r = 0.528, p<0.01), and the first principal
component (PC1) accounted for 75% of total variance over their common
period A. D. 1795–2005. Using the PC1 of tree-ring chronologies, the
winter (prior October to current January) PDSI for the research area was
reconstructed for the past 210 years (r = 0.617, p<0.01).
Wet winters occurred during A. D.1827–1861, 1880–1896 and 1922–1961,
while dry winters were prevailed in A. D. 1795–1826, 1862–1879,
1897–1921 and 1962 to present. Long-term decadal drought variations of
this reconstruction fitted quite close with the variations retained in
drought sensitive tree-ring series of the nearby regions, and this
demonstrated the new record was confidently reliable and could capture
large-scale climate signals.
1State Key Laboratory of Vegetation and Environmental Change, Institute of
Botany, Chinese Academy of
Sciences, Beijing 100093, China
2State Key Laboratory of Urban and Regional Ecology, Research Center for
Eco-Environmental Science, Chinese Academy of
Sciences, Beijing 100085, China.
3Laboratoire des Sciences du Climat et de l'Environnement, UMR 1572,
IPSL/CEA/CNRS/UVSQ,7 Bat 701, L'Orme des
Merisiers, CEA Saclay, 91 191 Gif sur Yvette cedex.