| 龙岩市降水时空分布及趋势研究 |
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| 引用本文： | 邓丽萍,陈红菊,张燕珊,张红梅,陈洋麟.龙岩市降水时空分布及趋势研究[J].大气科学学报,2016,39(3):426-432. |
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| 作者姓名： | 邓丽萍 陈红菊 张燕珊 张红梅 陈洋麟 |
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| 作者单位： | 漳平市气象局, 福建 龙岩 364400;漳平市气象局, 福建 龙岩 364400;龙岩市永定区气象局, 福建 龙岩 364100;龙岩市气象局, 福建 龙岩 364000;漳平市气象局, 福建 龙岩 364400 |
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| 基金项目： | 国家自然科学基金资助项目(41375137);高原大气与环境四川省重点实验室开放课题(PAEKL-2014-C4);江苏省气象科学研究所北极阁基金(BJG201304);气象灾害省部共建教育部重点实验室(南京信息工程大学)开放课题(KLME1205);2014年江苏省高等学校大学生创新创业训练计划项目(201410300001Z) |
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| 摘 要： | 利用龙岩市1960—2013年7个国家级气象站的逐日降水资料,采用Mann-Kendall趋势和突变检验法及Morlet小波功率谱分析方法,分析龙岩市降水的时空分布规律。结果表明,龙岩市年降水量呈微弱增加趋势,年际波动振幅较大。年降水量多年平均值为1 641 mm,最小值出现在1991年(1 139.9 mm),最大值则出现在1975年(2 286.9 mm),年降水时间序列存在显著的2~8 a的周期。降水主要集中在春季,春季降水量占全年降水量的38.2%左右,其次是夏季和秋季,冬季降水量最少,仅占全年降水量的11.5%。1—6月月平降水量呈现增长趋势,8—12月呈现递减趋势。北部和南部年降水量整体变化趋势基本一致,南部地区总体小于北部地区,只有极个别年份南部地区降水量大于北部地区。
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| 关 键 词： | 降水量 时空分布 M-K检验 |
| 收稿时间： | 2013/8/18 0:00:00 |
| 修稿时间： | 2013/12/23 0:00:00 |
Study on the development of the spatiotemporal distributions and trends of rainstorms |
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| DENG Liping,CHEN Hongju,ZHANG Yanshan,ZHANG Hongmei and CHEN Yanglin.Study on the development of the spatiotemporal distributions and trends of rainstorms[J].大气科学学报,2016,39(3):426-432. |
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| Authors: | DENG Liping CHEN Hongju ZHANG Yanshan ZHANG Hongmei and CHEN Yanglin |
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| Institution: | Zhangping Meteorological Bureau, Zhangping 364400, China;Zhangping Meteorological Bureau, Zhangping 364400, China;Yongding Meteorological Bureau of Longyan, Longyan 364100, China;Longyan Meteorological Bureau, Longyan 364000, China;Zhangping Meteorological Bureau, Zhangping 364400, China |
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| Abstract: | Rainstorms are a major category of meteorological disaster,and thus research on their spatiotemporal distributions and trends is important in reducing or even preventing their adverse impacts.In this study,precipitation data gathered from meteorological observation stations over seven counties in Longyan during a 54-year period from 1960 to 2013 were used to study the spatial distribution characteristics of rainstorms.Further analysis was made by dividing the seven counties of Longyan into southern and northern counties.The main analytical methods used were the Mann-Kendall (M-K) method and Morlet wavelet power spectrum analysis for the change or long-term trends of precipitation,and multi-scale analysis of the temporal (annual,seasonal,monthly) distribution of precipitation,respectively].The results showed that the annual precipitation duration at seven meteorological observation stations had an increasing tendency during the 54-year time period,but this tendency was not statistically significant.An obvious change-point occurred around 1975,after which the annual precipitation increased by 101.2 mm.Moreover,based on the Morlet wavelet power spectrum analysis,the southern and northern counties had different significant time-scale cycles,as well as variation in the strength of cycle over time.The precipitation amount at the seven observation stations was greatest in spring,accounting for around 38.2% of the annual precipitation,followed by summer and autumn.However,each of the four seasons demonstrated distinct changes,and change ranges,in different years.For example,spring precipitation changed significantly around 1999,according to analysis using the M-K test,decreasing by 7.1% after that year.Combined with the spatial distribution of rainfall duration,the precipitation over the northern counties was greater than that in the southern counties in spring and winter,less than that over southern counties in autumn,and nearly the same in summer.At the same time,however,neither the northern counties or southern counties showed a significant change in seasonal precipitation under the 95% confidence level.Through further data analysis,it was found that the monthly precipitation over the seven meteorological observation stations had an increasing trend in the time period from January to June,and a decreasing trend in the time period from August to December.Monthly precipitation was concentrated from March to June (being greatest in June),amounting to 17.3% of the total precipitation in a year.Comparing the monthly precipitation between the northern and southern counties,it was clear that-except for the period from July to September-monthly precipitation in the northern counties was greater than that in the southern counties. |
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| Keywords: | precipitation spatiotemporal distribution M-K test |
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