Tree-ring based runoff reconstruction for western Himalaya in India during the last two centuries

摘要

High-resolution proxy records of tree ring chronologies from different sites of the western Himalaya are used to study climatic variation. The 1st principal component performed based on the multi-species chronologies shows that increases in runoff water over the region are found to have a positive impact in favoring of tree growth process during the winter and summer months. While the role of vapor pressure on tree growth during the summer is not found conducive. The correlation coefficients (CCs) of tree growth with regional runoff and vapor pressure during summer season (April-June) are 0.46 and - 0.50, respectively, showing statistically significant at 0.1% level. The significant positive relationship of tree growth with regional runoff indicates that the increasing runoff water may be useful for the tree growth. Based on the significant relationship, the regional runoff water has been extended back to A.D. 1779, showing the increasing wetness since 1968 onward.