内蒙古地区沙尘和霾自动观测数据的可靠性和修正方法研究

Reliability and Correction Method of Automatic Observation Data of Sand-Dust and Haze in Inner Mongolia

选取2001-2019年内蒙古12个站点逐3 h的气象观测资料,从时空分布特征和判别方法研究内蒙古地区沙尘和霾自动气象观测数据的可靠性和判别标准的适用性。结合PM2.5和PM10空气质量指数,通过修正错误记录,将沙尘中误判的霾、霾中误判的沙尘分离出来。结果表明:修正前,沙尘和霾分别出现284、4 958次,占总频次的5%和95%,修正后得到的沙尘为905次、占总频次的17%,霾为2 891次、占总频次的55%,雾为33次、占总频次的0.6%,非沙尘和非霾天气为1 413次。通过修正,沙尘和霾天气现象记录趋于合理。

Based on the meteorological observation data with a temporal resolution of three hours from 12 climate stations over Inner Mongolia during the period from 2001 to 2019,the reliability of automatic meteorological observation data for dust and haze and the applicability of discrimination criteria were analyzed through spatial distribution characteristics and research methods.We use PM 2.5 and PM 10 as standards to correct erroneous records,and then separate the misjudged haze from the sand or separate the misjudged dust from the haze.The results indicate that the frequency of dust and haze was 284 and 4958 times,respectively,accounting for 5%and 95%of the total frequency before the correction,while the dust frequency is 905 times,accounting for 17%of the total frequency,haze frequency is 2891 times,accounting for 55%,fog frequency is 33 times,accounting for 0.6%,and the frequency of non dust or non haze is 1413 times after correction.The corrected records of dust and haze weather phenomena tend to be more reasonable.