| 1954-2005年长江以北地区初霜期变化趋势 |
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| 引用本文： | 李想,陈丽娟,张培群.1954-2005年长江以北地区初霜期变化趋势[J].气候变化研究进展,2008,4(1):21-25. |
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| 作者姓名： | 李想 陈丽娟 张培群 |
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| 作者单位： | 1. 中国气象局,国家气候中心,北京,100081;中国气象科学研究院,北京,100081;中国科学院研究生院,北京,100049
2. 中国气象局,国家气候中心,北京,100081 |
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| 基金项目： | 中国气象局科技攻关项目
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中国气象局多轨道业务建设项目 |
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| 摘 要： | 采用长江以北地区65个测站1954-2005年秋冬季逐日地面最低温度资料，计算分析长江以北地区初霜出现日期的年代际时空变化特征。结果表明：中国北方地区初霜是由北向南逐渐出现的，初霜发生日期具有明显的年代际变化特征，在20世纪90年代之后，大部分地区初霜日期偏晚的年份逐渐增多。中国北方地区初霜发生日期的早晚与北极涛动的强弱密切相关：当北极涛动处于正位相时，北半球以纬向型环流为主，中国北方大部分地区的初霜期偏晚；反之，当北极涛动处于负位相时，北半球以经向型环流为主，中国北方大部分地区的初霜期偏早。
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| 关 键 词： | 初霜期 年代际变化 北极涛动 长江以北 |
| 文章编号： | 1673-1719（2008）01-0021-05 |
| 收稿时间： | 2007-05-21 |
| 修稿时间： | 2007-09-06 |
Characteristics of Interdecadal Variations in First-Frost Date in Northern China During 1954-2005 |
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| Li Xiang,Chen Lijuan,Zhang Peiqun.Characteristics of Interdecadal Variations in First-Frost Date in Northern China During 1954-2005[J].Advances in Climate Change,2008,4(1):21-25. |
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| Authors: | Li Xiang Chen Lijuan Zhang Peiqun |
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| Abstract: | The daily minimum temperature data at 65 stations from 1954 to 2005 and the definition of first-frost date (first day in autumn and winter when the ground surface minimum temperature is equal or less than 0℃) were used to study the characteristics of interdecadal variations in the first-frost date over northern China. Results show that the first-frost in northern China occurred successively from north to south and the date of the first-frost had remarkably interdecadal variation characteristics, which were not totally identical in the different regions. After the 1990s, the late first-frost years have increased in most regions. Further analysis show that there was a close relationship between first-frost date and Arctic Oscillation Index (AOI). If the AOI was in a positive phase, then the zonally atmospheric circulation dominated in the Northern Hemisphere, and the first-frost was frequently later than normal, and vice versa. |
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| Keywords: | first-frost date interdecadal variation Arctic oscillation the north of the Yangtze River |
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