| 大尺度大气环流变化及其对北半球冬季温度的影响 |
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| 引用本文： | 龚道溢.大尺度大气环流变化及其对北半球冬季温度的影响[J].地学前缘,2000(Z2). |
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| 作者姓名： | 龚道溢 |
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| 作者单位： | 北京师范大学资源科学研究所环境演变与自然灾害教育部重点试验室!北京100875 |
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| 基金项目： | 国家自然科学基金资助项目!(496 35 190 )，“我国重大气候灾害的机理和预测理论研究”资助项目!(G19980 40 90 0 ) |
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| 摘 要： | 近半个世纪来的全球温度的变化表现出有很大的空间尺度和显著的线性趋势 ,许多研究强调温室效应对全球气候变暖的影响。文中的研究表明大尺度的大气环流的变化对北半球冬季温度有很重要的影响。最近一些学者侧重北大西洋涛动 (NAO)和北太平洋涛动 (NPO)的作用 ,而NAO和NPO都是行星尺度大气环流在区域的特殊表现形式。全球西风环流系统可能具有根本性的作用。当西风环流处于高指数时期时 ,则温度偏高 ;当处于低指数时期时 ,则温度偏低。西风强度及NAO和NPO能解释近 50年来北半球冬季温度变化方差的 2 7 2 %。
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| 关 键 词： | 大气环流 北半球 温度 |
LARGE-SCALE ATMOSPHERIC CIRCULATION AND ITS INFLUENCE ON WINTER TEMPERATURE IN THE NORTHERN HEMISPHERE |
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| GONG Dao,yi.LARGE-SCALE ATMOSPHERIC CIRCULATION AND ITS INFLUENCE ON WINTER TEMPERATURE IN THE NORTHERN HEMISPHERE[J].Earth Science Frontiers,2000(Z2). |
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| Authors: | GONG Dao yi |
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| Abstract: | The global temperature varies on a large\|scale and manifests a significant secular trend. Many researchers attribute the changes of temperature to the greenhouse warming.In this paper the attribution of large\|scale atmospheric circulation is emphasized. Some early studies paid more attention to the North Atlantic Oscillation and Northern Pacific Oscillation. However, the large\|scale atmospheric circulation plays a more important role in the northern hemispheric winter temperature variation.Index cycle is the most important monitor index to measure the basic atmospheric circulation status. The difference in zonally averaged sea level pressure (or geopotential heights) between 35°N and 55°N ( or between 40°N and 60°N) was usually used to measure the “high index” or “low index” for the northern hemisphere. In the high index state, the northern hemispheric temperature is high, and vice versa. About 27 2% annual variance of the temperature can be accounted for by the zonally western wind,the North Atlantic Oscillation and the North Pacific Oscillation in the northern hemisphere during the last 50 winters. |
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| Keywords: | atmospheric circulation northern hemisphere temperature |
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