By using the simulative results of more than 20 climate system models which were provided by the fourth assessment report of the Intergovernmental Panel on Climate Change(IPCC),the climate change in Dalian area in the...By using the simulative results of more than 20 climate system models which were provided by the fourth assessment report of the Intergovernmental Panel on Climate Change(IPCC),the climate change in Dalian area in the 21st century under the different scenarios(SRES A2,SRES A1B and SRES B1) were analyzed and predicted with the multi-model's aggregative simulative results via the interpolation downscaling calculation.The results showed that the climate in Dalian would have the obvious warming and wetting tendency in the 21st century as a whole.The annual average warming tendency of air temperature would be 2.45-3.46 ℃/100 years,and the annual precipitation increase trend would be 5.8%-16.3% per 100 years.The warming in winter would be the most obvious,and the precipitation increase would be comparatively obvious in winter and spring.The precipitation decrease would be comparatively obvious in autumn in the previous period of 21st century.In A2,A1B and B1 scenarios,the air temperatures in the late period of 21st century would respectively be 3.46,3.44 and 2.45 ℃ higher than in the ordinary years,and the annual precipitation would respectively be 16.3%,11.8% and 5.79% more than in the ordinary years.展开更多
The variation characteristics of acid rain and the relationship between the formation of acid rain and meteorological conditions were analyzed based on the observation data and meteorological records collected from ac...The variation characteristics of acid rain and the relationship between the formation of acid rain and meteorological conditions were analyzed based on the observation data and meteorological records collected from acid rain observation station in Dalian over 2006-2009.The results showed that Dalian was one of the regions with strong acid rain in northern China,with the frequency of 66% and pH value of 3.49.The acidity was the strongest in fall and weakest in spring;and the maximum and minimum frequencies were in summer and in winter respectively.Frequency of acid rain was inversely proportional to wind speed and concentration of inhalable particles in Dalian;acid rain occurred easily in foggy weather due to the steady stratification and abundant moisture;continuous precipitation did not mean the reduction of acidic material in the air,and the rainfall with increased acidity in the second day accounted for 42% in continuous precipitation cases.展开更多
利用2001-2012年大连地区大雾气象观测资料,对近十几年大连地区大雾的气候特征和天气学成因进行了分析,结果表明:大连地区大雾日数,长海最多,金州最少;除金州外,夏季最多,春季次之,冬季最少.大雾生成的日变化规律为,春季大雾多生成于02:...利用2001-2012年大连地区大雾气象观测资料,对近十几年大连地区大雾的气候特征和天气学成因进行了分析,结果表明:大连地区大雾日数,长海最多,金州最少;除金州外,夏季最多,春季次之,冬季最少.大雾生成的日变化规律为,春季大雾多生成于02:00-08:00,20:00-23:00两个时段;夏季大雾多出现于20:00-次日08:00.大连地区产生大雾的主要天气形势可分为4种类型:高压后部型、气旋型、冷锋型、均压场型,其中除气旋型外的3种类型的大雾天气从开始到维持阶段水汽都比较充沛,盛行南到东南风,转为偏北风后大雾消散结束,而气旋型大雾天不如其他3种的水汽那么充沛,从开始到结束都为偏北风.大雾形成阶段在大连地区低空通常有暖平流输送来大量水汽,都有一个水汽聚集的过程,其层次一般都在900 h Pa层(海拔1 000 m左右)或其附近,并且该地区低空都会出现气流辐合、上升的三维流畅特征.大雾维持期间,通常风速较小,层结稳定,温度露点差也较小,接近饱和状态;当大雾消散时通常当地低空会有冷空气入侵,风速迅速增大,高空都会受到冷平流的影响.展开更多
基金Supported by The National Natural Science Fund(40971294)The General Project of Humanities and Social Sciences in Liaoning Education Department(2009A405)The Science and Technology Plan Project of Dalian Technology Bureau(2008E13SF189,2009E11SF230)
文摘By using the simulative results of more than 20 climate system models which were provided by the fourth assessment report of the Intergovernmental Panel on Climate Change(IPCC),the climate change in Dalian area in the 21st century under the different scenarios(SRES A2,SRES A1B and SRES B1) were analyzed and predicted with the multi-model's aggregative simulative results via the interpolation downscaling calculation.The results showed that the climate in Dalian would have the obvious warming and wetting tendency in the 21st century as a whole.The annual average warming tendency of air temperature would be 2.45-3.46 ℃/100 years,and the annual precipitation increase trend would be 5.8%-16.3% per 100 years.The warming in winter would be the most obvious,and the precipitation increase would be comparatively obvious in winter and spring.The precipitation decrease would be comparatively obvious in autumn in the previous period of 21st century.In A2,A1B and B1 scenarios,the air temperatures in the late period of 21st century would respectively be 3.46,3.44 and 2.45 ℃ higher than in the ordinary years,and the annual precipitation would respectively be 16.3%,11.8% and 5.79% more than in the ordinary years.
基金Supported by Scientific Research Special Fund for Public Welfare Industry (Meteorology) (GYHY20080620)
文摘The variation characteristics of acid rain and the relationship between the formation of acid rain and meteorological conditions were analyzed based on the observation data and meteorological records collected from acid rain observation station in Dalian over 2006-2009.The results showed that Dalian was one of the regions with strong acid rain in northern China,with the frequency of 66% and pH value of 3.49.The acidity was the strongest in fall and weakest in spring;and the maximum and minimum frequencies were in summer and in winter respectively.Frequency of acid rain was inversely proportional to wind speed and concentration of inhalable particles in Dalian;acid rain occurred easily in foggy weather due to the steady stratification and abundant moisture;continuous precipitation did not mean the reduction of acidic material in the air,and the rainfall with increased acidity in the second day accounted for 42% in continuous precipitation cases.
文摘利用2001-2012年大连地区大雾气象观测资料,对近十几年大连地区大雾的气候特征和天气学成因进行了分析,结果表明:大连地区大雾日数,长海最多,金州最少;除金州外,夏季最多,春季次之,冬季最少.大雾生成的日变化规律为,春季大雾多生成于02:00-08:00,20:00-23:00两个时段;夏季大雾多出现于20:00-次日08:00.大连地区产生大雾的主要天气形势可分为4种类型:高压后部型、气旋型、冷锋型、均压场型,其中除气旋型外的3种类型的大雾天气从开始到维持阶段水汽都比较充沛,盛行南到东南风,转为偏北风后大雾消散结束,而气旋型大雾天不如其他3种的水汽那么充沛,从开始到结束都为偏北风.大雾形成阶段在大连地区低空通常有暖平流输送来大量水汽,都有一个水汽聚集的过程,其层次一般都在900 h Pa层(海拔1 000 m左右)或其附近,并且该地区低空都会出现气流辐合、上升的三维流畅特征.大雾维持期间,通常风速较小,层结稳定,温度露点差也较小,接近饱和状态;当大雾消散时通常当地低空会有冷空气入侵,风速迅速增大,高空都会受到冷平流的影响.
