摘要
为研究青海省大气降尘量的地域性分布和变化特征,探讨大气降尘的气象影响因素,利用青海省8个监测站点2004—2017年降尘量和气象数据,分析青海省降尘量时空分布规律及其影响因素。结果表明:(1)青海省及各生态功能区大气降尘量总体呈下降趋势。(2)降尘量季节变化特征明显,降尘量主要集中在3—4月,冬春季节多、夏秋季节少,降尘主要受来自西北面的沙尘输送以及局地扬尘的影响。(3)青海省各站点及生态功能区降尘量和变化趋势差异较大,最高和最低年降尘量分别出现在西宁和瓦里关本底台。降尘量在较大空间尺度上的分布受气候背景影响,在局部区域则受地形、地貌、水文、土壤和植被等地方性因素控制;区域气象条件是影响青海省降尘的外来因素。(4)降尘量的变化主要受相对湿度的影响,降水日数的变化也影响降尘量的大小。
In order to study the regional distribution and variation characteristics of atmospheric dust fall in Qinghai Province and explore its meteorological influence factors,this paper collected the monthly dust fall and meteorological data of8monitoring stations in Qinghai Province from2004to2017,and analyzed the spatial and temporal distribution of atmospheric dust fall and its influencing factors.The results are as follows:(1)The atmospheric dust fall of Qinghai Province and each ecological function area showed a decreasing trend.(2)The monthly and seasonal variation trend of dust fall were obvious.The dust fall mainly concentrated in March to April,it was more in winter and spring and less in summer and autumn.The dust fall was mainly affected by dust transport from the northwest and local dust.(3)Dust fall amount and change trend of each station and ecological function area in Qinghai Province were quite different.The highest and the lowest annual dust fall amount appeared at Xining and Wariguan atmosphere watch baseline observatory,respectively.The distribution of dust fall on a larger spatial scale was influenced by climatic background,but in some areas it was controlled by local factors such as topography,landform,hydrology,soil and vegetation,and regional meteorological conditions were external factors affecting dust fall in Qinghai Province.(4)The variation of dust fall was mainly affected by relative humidity,and the variation of precipitation days also affected it.
作者
祁栋林
赵全宁
赵慧芳
韩廷芳
苏文将
QI Donglin;ZHAO Quanning;ZHAO Huifang;HAN Tingfang;SU Wenjiang(Institute of Qinghai Meteorological Science,Xining 810001,China;Qinghai Key Laboratory of Disaster Preventing and Reducing,Xining 810001,China;Geermu Meteorological Bureau of Qinghai Province,Geermu 816099,Qinghai,China)
出处
《干旱气象》
2018年第6期927-935,共9页
Journal of Arid Meteorology
基金
公益性行业(气象)科研专项(GYHY201506001)
青海省科技厅项目(2017-SF-131
2017-ZJ-Y02)
青海省气象局重点项目(青海省空气质量客观预报方法研究)共同资助
关键词
降尘量
生态功能区
相对贡献率
青海省
dust fall
ecological functional area
relative contribution rate
Qinghai Province
