Present and Past Variability in Monsoon Climate Over the Himalayas Reconstructed from Tree Rings

Cook, Edward R，哥伦比亚大学lamon - doherty地球观测站题目：从树木年轮分析喜马拉雅山季风气候的现在和过去的变化这个奖项支持一个研究项目，该项目旨在通过气候敏感的、绝对有年代的、每年的树木年轮年表来重建尼泊尔过去几个世纪的气候。用于此目的的主要树轮变量是环宽度。然而，一些木材收集也将处理树轮密度，以从树轮中提取尽可能多的有用的气候信息。主要的重点将是重建西南季风的各种特征，因为它影响喜马拉雅山脉。过去的温度往往与环密度的变化密切相关，也将被重建。因此，这项研究将产生各种各样的气候重建。所有1960年以前的尼泊尔气候记录都将被数字化并进行分析，以更好地了解尼泊尔气候的空间格局，以及它们与印度更长期记录的关系，并用于校准过去气候的树轮重建。在这个项目期间，将在尼泊尔编制50-100个树木年轮年表。这些年表的长度大多超过200年，有些甚至可以追溯到300-400年前。此外，还将设法进入不丹、巴基斯坦北部、克什米尔和锡金，以扩大这项工作的地理覆盖范围。

Abstract ATM-9630144 Cook, Edward R, Columbia University Lamont-Doherty Earth Observatory Title: Present and Past Variability in Monsoon Climate Over the Himalayas from Tree Rings This award supports a research project designed to reconstruct climate of the past few centuries over Nepal from a network of climatically sensitive, absolutely dated, annual tree-ring chronologies. The principal tree-ring variable for this purpose is ring width. However, some of the wood collections will also be processed for tree-ring density to extract as much useful climate information as possible from the tree-rings. The principal emphasis will be on reconstructing various features of the Southwest Monsoon as it affects the Himalayas. Past temperatures, which tend to be tightly linked to variations in the ring density, will also be reconstructed. Therefore, a variety of climatic reconstructions will result from this research. All of the pre-1960 Nepalese climate records will be digitized and analyzed to better understand the spatial patterns of climate in Nepal, their relationships with longer records in India, and for calibrating the tree-ring reconstructions of past climate. 50-100 tree-ring chronologies will be developed in Nepal over the life of this project. Most of these chronologies will exceed 200 years in length, with some extending back 300-400 years. In addition, attempts will be made to gain access to Bhutan, northern Pakistan, Kashmir, and Sikkim to extend the geographic coverage of this effort.