| 1961—2011年江苏夏季分级雨日的气候特征 |
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| 引用本文： | 孙燕,朱明月.1961—2011年江苏夏季分级雨日的气候特征[J].气象科学,2014,34(2):200-205. |
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| 作者姓名： | 孙燕 朱明月 |
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| 作者单位： | 江苏省气象台, 南京 210008;南京大学大气科学学院, 南京 210093 |
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| 基金项目： | 国家科技支撑项目（2011BAK21B04）；江苏省科技厅科技支撑计划社会发展项目（BE2011818）；江苏省气象科研开放基金 （K201006） |
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| 摘 要： | 利用江苏省1961—2011年夏季67站逐日气象观测资料,按照不同量级的日降水量,运用趋势分析、突变分析、小波分析等方法对近51 a江苏省夏季雨日进行研究。研究发现:各级雨日分布均呈明显的由西北—东南向的变化特征;各级雨日均存在明显的年际、年代际变化和突变特征;各级雨日存在准6 a的年际振荡周期和准12 a的年代际振荡周期,但是存在的主要时段有所差异。各级雨日的趋势变化中,除微量雨日为下降趋势外,其它各级雨日以上升趋势为主。分析各级雨日对有效雨日的趋势贡献:江苏北部地区有效雨日的减少主要来自于大雨、大暴雨日的减少;中部地区的有效雨日增多来自于小雨、大雨和暴雨雨日的增多;南部地区有效雨日增多来自于小雨、大雨和大暴雨日的贡献。
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| 关 键 词： | 降水分级 趋势分析 贡献雨日 |
| 收稿时间： | 2012/9/19 0:00:00 |
| 修稿时间： | 2013/8/22 0:00:00 |
Climatic characteristics of summer rain days at different levels in Jiangsu from 1961 to 2011 |
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| SUN Yan and ZHU Mingyue.Climatic characteristics of summer rain days at different levels in Jiangsu from 1961 to 2011[J].Scientia Meteorologica Sinica,2014,34(2):200-205. |
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| Authors: | SUN Yan and ZHU Mingyue |
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| Institution: | Jiangsu Meteorological Observatory, Nanjing 210008, China;;School of Atmospheric Science, Nanjing University, Nanjing 210093, China |
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| Abstract: | Based on the summer daily observations from 67 stations in Jiangsu during 1961-2011, using the daily rainfall amount at different levels, the summer rain days of Jiangsu for nearly 51 years were analyzed with trend analysis, mutation analysis and wavelet analysis. The study found that all of rain days at different grades present obvious character of distribution in northwest-southeast direction, and Huaihe river is an important dividing line of the spatial and temporal distribution at different grades of rain days in Jiangsu in summer; along with obvious interannual and decadal changes, rain days at all levels have mutation characteristic as well as the interannual oscillation cycle of quasi-6-year and decadal oscillation cycle of quasi-12-year with different major periods of presence; the days with trace amount of rain are decreasing while rain days at other levels are increasing. The trend contribution of rain days at various levels to effective rain days is analyzed: the downward trend of effective rain days in north Jiangsu mainly results from decreasing of heavy and torrential rain days, while the upward one in central and south Jiangsu is attributed to the increasing of light, heavy and torrential rain days. |
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| Keywords: | Precipitation grades Trend analysis Contribution rain days |
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