Dendroclimatic reconstruction of summer precipitation at Srinagar, Kashmir, India, since the late-eighteenth century
Dendroclimatic reconstruction of summer precipitation at Srinagar, Kashmir, India, since the late-eighteenth century
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十八世纪末以来印度克什米尔斯利那加夏季降水的树木气候重建
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
K. Rupa Kumar
中科院分区：
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作者：
H. Borgaonkar;G. B. Pant;K. Rupa Kumar
西喜马拉雅山脉广阔的针叶林为树气候学研究提供了巨大的潜力。冷杉、杉木、云杉和松树是该地区的主要树种，由许多古树和活树组成。这些树木的年轮模式可以精确地确定年代，包含了过去几个世纪气候变化的宝贵的高分辨率信息。本文对1982年在克什米尔谷地Pahalgam附近森林取样的冷杉（Abies pindrow）和云杉（Picea smithiana）的环宽数据进行了分析。利用三次样条平滑法将非气候变化从原始环宽序列中滤除，得到环宽指数序列。通过对13个smithiana样品和8个pindrow样品的平均环宽指数年表进行平均，编制了平均环宽指数年表。P. smithiana的平均环宽指数年表最大长度为208年（1775-1982），A. pindrow的平均环宽指数年表最大长度为371年（1612-1982）。利用1893-1982年斯利那加月平均气温和降雨量的仪器记录，建立了响应函数。两种环宽年表均与夏季气温呈显著负相关，与夏季降水呈显著正相关。利用多物种环序列网络对不同月份组合进行了校准和验证分析，重建了斯利那加的夏季降水，并将其追溯到18世纪。
The extensive coniferous forests of the western Himalayas provide great potential for dendroclimatic research. Abies, Cedrus, Picea and Pinus are the main tree genera of the region, consisting of many old and living trees. The annual growth-ring patterns of these trees, which can be precisely dated, contain valuable high-resolution information on climate variability over the past few centuries. This paper presents an analysis of the ring-width data of Abies pindrow and Picea smithiana based on samples collected from forest sites around Pahalgam in the Kashmir Valley in 1982. The non- climatic variations have been filtered out of the raw ring-width series using a cubic spline smoothing, and ring-width index series have been obtained. The mean ring-width index chronologies have been prepared by averaging the indices of 13 samples for P. smithiana and eight samples for A. pindrow. The maximum lengths of mean ring-width index chronologies are 208 years (1775-1982) for P. smithiana and 371 years (1612-1982) for A. pindrow. Response functions have been developed using the instrumental record of monthly mean temperature and rainfall at Srinagar during the period 1893-1982. Both ring- width chronologies indicate a significant negative response to summer temperature and a significant positive relationship with summer precipitation. Calibration and verification analysis has been carried out for different combinations of months using a multiple species ring-series network and the summer precipitation at Srinagar has been reconstructed back to the eighteenth century.