城市化发展对苏州灰霾影响的数值模拟

南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (3): 551–.

城市化发展对苏州灰霾影响的数值模拟

钱俊龙1，刘红年1*,林慧娟2，朱莲芳2，王学远1，蒋维楣1

出版日期:2015-04-23 发布日期:2015-04-23
作者简介:(1.南京大学大气科学学院,南京,210093;2.苏州市气象局,苏州,215131)

Numerical simulation of the impact of urban growth on urban haze

Qian Junlong1, Liu Hongnian1*, Lin Huijuan2, Zhu lianfang2, Wang Xueyuan1,Jiang Weimei1

Online:2015-04-23 Published:2015-04-23
About author:(1.School of Atmospheric ScienceNanjing UniversityNanjing,210093China; 2.Suzhou Meteorological Bureau Suzhou ,215131China)

摘要/Abstract

摘要： 城市面积扩张、建筑密度加大等城市化特征会影响城市气象环境，导致城市污染物扩散能力减弱，这可能对中国城市灰霾有一定贡献。本文利用南京大学空气质量预报模式（NJU-CAQPS）研究了苏州城市化发展对灰霾的影响。本文利用苏州地区1986年、1996年、2006年三个年代的地表类型资料对苏州地区2010年1、4、7、10月中旬共18d灰霾状况进行数值模拟，同时进行了建筑高度和建筑密度对灰霾影响的敏感性试验。结果表明：近20年的城市面积扩张可导致城区PM2.5平均浓度增加3~4μg·m-3，城市部分地区PM2.5增加可达25~32μg·m-3；使城区平均能见度降低0.3~0.4km，局地可降低2~3km；城市面积扩张可导致模拟日平均灰霾小时数增加0.3~0.5h，最大增加可达5小时，灰霾面积增加170km2。城市建筑高度和密度的增加使城区部分地区PM2.5增加6~12μg·m-3；平均能见度降低0.1km，局地降低0.3~0.6km。城市化发展对局地污染物浓度影响较大，城市面积对城市灰霾的影响远大于建筑高度和密度影响。随着城市面积扩张，城市“混浊岛”、“灰霾线”的高度在升高。

Abstract: The expansion of urban size and denser buildingsmay have an impact on urban meteorology and environment, weakeningcity`s diffusion capacity, which may lead to urban haze in China.NJU-CAQPS (NanJing University City Air Quality Prediction System) is used in this research to simulate the impact of urban growth on urban haze in Suzhou area. The land-use data of 1986,1995 and 2006 are used in the simulations and 18d inMid January, April, July and October are chosen to simulate. Another 2 pairs of sensitivity experiments are performed to study the impact of the height and density of buildings on the urban haze.The urban expansionin the last 2 decadesmay result in an increase of the PM2.5 concentration by 3~4μg·m-3 (25~32μg·m-3 in local area) and a decrease of visibility by 0.3~0.4km (2~3km in local area). Consequently, the average haze hours increase by 0.3~0.5h (5h at most), and the haze area increase by 170km2. The changes of building may result in an increase of PM2.5concentration by 6~12μg·m-3 in some area and a decrease of visibility by 0.1km (0.3~0.6km in local area). The impact of urbanization onpollutants concentration is more significant in the local area of pollutants source, and the expansion of urban size plays a more important role than the changes of buildings. The urban “muddy island” and “haze line” elevate as the urban size expand

钱俊龙1，刘红年1*,林慧娟2，朱莲芳2，王学远1，蒋维楣1. 城市化发展对苏州灰霾影响的数值模拟[J]. 南京大学学报(自然科学版), 2015, 51(3): 551–.

Qian Junlong1, Liu Hongnian1*, Lin Huijuan2, Zhu lianfang2, Wang Xueyuan1,Jiang Weimei1. Numerical simulation of the impact of urban growth on urban haze[J]. Journal of Nanjing University(Natural Sciences), 2015, 51(3): 551–.

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