气象2023，Vol.49Issue(11)：1405-1413,9.DOI:10.7519/j.issn.1000-0526.2023.060402
大理苍山不同海拔高度湿季降水日变化特征分析
Diurnal Variation of Wet Season Precipitation at Different Altitudes of Cangshan Mountain in Dali
摘要
Abstract
Based on the hourly precipitation data in the wet season during 2011-2020 from the gradient ob-servation system between Cangshan Mountain and Erhai Lake of Dali National Climate Observatory,the diurnal variation characteristics of precipitation at the mountain top,hillside and dam area are analyzed.The results show that the diurnal variation of rainfall amount at the dam station presented one peak,while that at mountain side and hilltop stations presented two peaks.The diurnal variation of rainfall frequency at dam and hilltop stations displayed a single peak,while that at the hillside station was relatively stable.All hourly rainfall amount and rainfall frequency for a whole day basically increased with the rise of alti-tudes.The diurnal variation of rainfall intensity at hilltop station exhibited double peaks,while that the hillside and dam stations showed remarkable fluctuation with small values in the afternoon and large values over night.There were no significant differences in rainfall intensity from 14:00 BT to 17:00 BT among the three stations,but the rainfall intensities at the hillside and dam stations were obviously greater than that at the hilltop station during other periods.The rainfall amount with a duration of 2-16 h over night was a large value area,which maintained a longer duration with the rise of altitude.The rainfall amount with a duration of less than 6 h during the daytime was a large value area,and the occurrence of the large value was delayed with the increase of altitude.The rainfall frequencies at all the three stations had a large value area during the day(night)when the rainfall duration was less than 6 h,while that at the hilltop sta-tion only had a large value area at night when the duration was 7-18 h.The rainfall frequencies over night were greater than that during the day at the dam and hilltop stations,while there was little difference in the rainfall frequency during the day and night at the hillside station.The accumulated rainfall amount and frequency of long(medium and short)duration increased(decreased)with the increase of altitudes.The contribution of long duration rainfall amount(long duration rainfall frequency)to accumulated rainfall amount(accumulated rainfall frequency)at each station was the largest,but the contribution of short du-ration rainfall amount(medium duration rainfall frequency)was the least.关键词
大理苍山/梯度观测/湿季降水/日变化特征Key words
Cangshan Mountain in Dali/gradient observation/precipitation in the wet season/diurnal vari-ation分类
大气科学引用本文复制引用
董保举,徐安伦,苏锦兰..大理苍山不同海拔高度湿季降水日变化特征分析[J].气象,2023,49(11):1405-1413,9.基金项目
国家自然科学基金面上项目(41875123)、国家重点研发计划(2018YFC1507603)、中国气象科学研究院基本科研业务费重点项目(2020Z006)、第二次青藏高原综合科学考察研究项目(2019QZKK0105)和云南省科技厅科技计划项目(202305AM070004)共同资助 （41875123）
