Based on the environmental monitoring data and meteorological data in Changchun City during the last three years,seasonal variation characteristics of the main pollutant PM10 were analyzed. The statistical correlation...Based on the environmental monitoring data and meteorological data in Changchun City during the last three years,seasonal variation characteristics of the main pollutant PM10 were analyzed. The statistical correlation between PM10 concentration and six meteorological factors was analyzed,including average temperature,precipitation,relative humidity,visibility,average wind speed and air pressure. The results showed that the PM10 concentration was about 0.097-0.100 mg/m3 from 2006 to 2008 and had no significant increasing or decreasing trend in the three years. The PM10 concentration in Changchun showed significant seasonal variations;it was obviously a bit higher in winter and spring,lower in summer. The PM10 pollution primarily attained Grade Ⅱ in the recent three years,and it accounted for 87.7%. PM10 pollution was heavier on the day when it was accompanied by fog,smog,gale and dust. The results showed that PM10 concentration had a negative correlation with the average temperature,precipitation,visibility and average wind speed,and had a positive correlation with relative humidity and air pressure.展开更多
Variation characteristics of drought strength,drought frequency,drought days and drought coverage were analyzed with the daily temperature and precipitation data of 50 observation stations in Liaoning Province between...Variation characteristics of drought strength,drought frequency,drought days and drought coverage were analyzed with the daily temperature and precipitation data of 50 observation stations in Liaoning Province between 1961 and 2008.The comprehensive meteorological drought index was considered as the standard of drought division.The results showed that spring drought,summer drought and autumn drought had enlarged coverage and increasing drought strength.The coverage and strength of spring drought had the most obvious variation.The days of spring drought mainly decreased,while the days of summer and autumn drought mainly increased.The frequency of spring drought was higher in western Liaoning,while that of the three types of drought was low in eastern Liaoning.展开更多
基金Supported by Social Welfare Research Fund of Ministry of Science & Technology(2005-DIB2J111)Functional Expense Program of Basic Scientific Research of Shenyang Institute of Atmospheric Environment,China Meteorological Bureau(SYKYYW200901)
文摘Based on the environmental monitoring data and meteorological data in Changchun City during the last three years,seasonal variation characteristics of the main pollutant PM10 were analyzed. The statistical correlation between PM10 concentration and six meteorological factors was analyzed,including average temperature,precipitation,relative humidity,visibility,average wind speed and air pressure. The results showed that the PM10 concentration was about 0.097-0.100 mg/m3 from 2006 to 2008 and had no significant increasing or decreasing trend in the three years. The PM10 concentration in Changchun showed significant seasonal variations;it was obviously a bit higher in winter and spring,lower in summer. The PM10 pollution primarily attained Grade Ⅱ in the recent three years,and it accounted for 87.7%. PM10 pollution was heavier on the day when it was accompanied by fog,smog,gale and dust. The results showed that PM10 concentration had a negative correlation with the average temperature,precipitation,visibility and average wind speed,and had a positive correlation with relative humidity and air pressure.
基金Supported by Science and Technology Development Fund of Liaoning Provincial Meteorological Bureau (200820)
文摘Variation characteristics of drought strength,drought frequency,drought days and drought coverage were analyzed with the daily temperature and precipitation data of 50 observation stations in Liaoning Province between 1961 and 2008.The comprehensive meteorological drought index was considered as the standard of drought division.The results showed that spring drought,summer drought and autumn drought had enlarged coverage and increasing drought strength.The coverage and strength of spring drought had the most obvious variation.The days of spring drought mainly decreased,while the days of summer and autumn drought mainly increased.The frequency of spring drought was higher in western Liaoning,while that of the three types of drought was low in eastern Liaoning.