摘要
本文利用清镇市1980-2019年共40年逐日气象数据资料,分析了清镇市年、季降雨量、雨日和雨强变化趋势及其演变规律。结果表明,清镇市近40年降水量呈上升趋势,平均每10年增加37 mm,降水量序列在4~6 a、12~14 a及23~26 a左右的尺度上存在较为明显的周期波动,且降水量表现为夏多冬少,变化趋势为春强冬弱的季节特征。清镇年平均雨日数为184.5 d,约占全年天数的50.5%,近40年来呈减少趋势,平均每10年减少3.6 d,在3~4 a、8~12 a、18~21 a及22~25 a左右的尺度上存在周期波动。在不同等级的雨日序列中,小、中雨日呈减小趋势;而大雨、暴雨日及以上量级变化则呈上升趋势。雨日月、季变化特征明显,春季雨日最多,夏季次之,在5、6月份达到峰值。最长连续降雨日和无雨日数均呈减少趋势,其中年最长连续雨日为22 d(1991年),最长连续无雨日为25 d(1983年)。
Based on daily meteorological data of Qingzhen City ranging from 1980 to 2019,we analyzed the trend and evolution of annual and seasonal rainfall,rainy days and rainfall intensities.The results showed that precipitation in Qingzhen City showed an upward trend in the past 40 years,with an average increase of 37 mm every 10 years.There were obvious periodic fluctuations in precipitation series at the scales of 4~6 a,12~14 a and 23~26 a,and the precipitation was characterized by more in summer and less in winter,and this change trend was shown strong in spring and weak in winter.The annual average number of rainy days in Qingzhen was 184.5 days,accounting for 50.5% of the total number of days in the whole year.It showed a decreasing trend in the past 40 years with an average reduction of 3.63 days per 10 years.There were periodic fluctuations in the rain-day sequence on the scales of 3~4 a,8~12 a,18~21 a and 22~25 a.In the analysis of rainy days,light and moderate rainy days showed a decreasing trend,while the change of heavy rainy days,rainstorm days and above magnitude displayed an upward trend during the past 40 years.The month and season of rainy days had obvious characteristics,with the most rainy days in spring,followed by summer,peaking in May and June.Both the longest continuous rainy days and the number of rain-free days displayed a decreasing trend,and the longest continuous rainy days was 22 days per year(1991),and the longest continuous rain-free days was up to 25 days(1983).
作者
杨涛
张皓
蔡志颖
滕万里
金昭贵
YANG Tao;ZHANG Hao;CAI Zhiying;TENG Wanli;JIN Zhaogui(Meteorological Bureau of Guiyang,Guiyang,Guizhou 550001,China;Meteorological Bureau of Qingzhen,Qingzhen,Guizhou 551400,China;Country Level Agrometeorological Test Station in Guiyang,Qingzhen,Guizhou 551400,China;Meteorological Burean of Ningbo,Ningbo,Zhejiang 315099,China)
出处
《山地农业生物学报》
2021年第5期69-75,共7页
Journal of Mountain Agriculture and Biology
基金
贵州省气象局项目(黔气科登[2020]08-12)
贵阳市科技计划项目(筑科合同[2020]7-3)。
关键词
雨量
雨日
气候趋势
rainfall
rainy day
climate trend
