| 青藏高原南部和北部暖季气温年代际 变化差异的界线位置* |
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| 引用本文： | 王宁练.青藏高原南部和北部暖季气温年代际 变化差异的界线位置*[J].第四纪研究,2006,26(2):165-172. |
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| 作者姓名： | 王宁练 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所冰冻圈与环境联合重点实验室,兰州,730000 |
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| 基金项目： | 中国科学院"百人计划";中国科学院知识创新工程项目;国家杰出青年科学基金;国家重点基础研究发展计划(973计划) |
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| 摘 要： | 文章通过对青藏高原北部马兰冰芯中δ18 O记录(主要反映暖季气温)与近几十年来高原中、南部气象台站暖季气温变化的对比分析,发现在年代际时间尺度上高原北部地区暖季气温变化与南部地区存在明显的差异,其分界线位于32°~33°N附近一带。该位置也是青藏高原地区气候、地理、地质、地球物理等方面存在南北差异的重要分界线。
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| 关 键 词： | 青藏高原 马兰冰芯 气候变化 圈层相互作用 |
| 文章编号： | 1001-7410（2006）02-165-08 |
| 收稿时间： | 2005-12-01 |
| 修稿时间： | 2005-12-28 |
THE BOUNDARY BETWEEN THE NORTHERN AND SOUTHERN TIBETAN PLATEAU WITH DIFFERENT VARIATIONS IN THE WARM SEASON AIR TEMPERATURES ON THE DECADAL TIME SCALE |
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| Wang Ninglian.THE BOUNDARY BETWEEN THE NORTHERN AND SOUTHERN TIBETAN PLATEAU WITH DIFFERENT VARIATIONS IN THE WARM SEASON AIR TEMPERATURES ON THE DECADAL TIME SCALE[J].Quaternary Sciences,2006,26(2):165-172. |
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| Authors: | Wang Ninglian |
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| Institution: | (Key Laboratory of Cryosphere and Environment,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou730000 |
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| Abstract: | In the northern Tibetan Plateau, especially in the Kekexili Region and the Qiangtang Plateau, the sparsity of the meteorological observation data has limited researchers to investigate the temporal and spatial characteristics of climate changes over the whole Tibetan Plateau. Ice cores retrieved from these regions can supply information of the past climate changes, making it possible to compare the past climate changes in different regions of the Tibetan Plateau. In 1999, we drilled an ice core from the Malan Ice Cap in the Kekexili Region. Based on the record of δ18 O in this ice core, past warm season air temperature variations have been reconstructed. Comparing the variations of δ18 O in the Malan ice core and the summer half-year air temperature at Lhasa in the southern Tibetan Plateau, we found out that the variations of the warm season air temperatures on the decadal time scale were opposite at these two sites, encouraging us to compare the record of δ18 O in the Malan ice core with the warm season air temperatures in an array of meteorological stations from north to south of the Tibetan Plateau. It was found out that the boundary between the northern and southern Tibetan Plateau with different variations in the warm season air temperatures on the decadal time scale is at about 32°~33°N. This is also supported by the NCEP/NCAR reanalysis air temperature data. Interestingly, most atmospheric, geographical, geological and geophysical phenomena over the Tibetan Plateau match this boundary, for example, the average position of the shear line activity, the northward extending limit of the Indian monsoon, the south limit of the continuous permafrost region, the location of the Lake Bangong-Nu Jiang suture zone, the dividing line between the high and low geothermal heat fluxes, the dividing line between the old and young terranes, etc. It was presumed that the differences in summer atmospheric circulations, in surface permafrost conditions, and in geothermal heat fluxes in the northern and southern Tibetan Plateau might be responsible for the different variations in the warm season air temperatures in the northern and southern Tibetan Plateau on the decadal time scale. These also suggest that the Tibetan Plateau might be an ideal natural laboratory for studying the interactions among the Earths spheres. |
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| Keywords: | the Tibetan Plateau the Malan ice core climate change interactions among the Earth's spheres |
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