姚日升. 2017. 宁波一次罕见持续重度污染事件的成因分析[J]. 气象学报, ():-, doi:10.11676/qxxb2017.018
宁波一次罕见持续重度污染事件的成因分析
Analysis on a rare persistent heavy pollution case in Ningbo city
投稿时间:2016-07-18  最后修改时间:2016-09-26
DOI:10.11676/qxxb2017.018
中文关键词:  大气环境学,空气质量,数值模拟,WRF/CALMET,边界层
英文关键词:Atmospheric Environmental Science, Air Quality, Numerical Simulation, WRF/CALMET, Boundary Layer
基金项目:浙江省自然科学基金(LY16D050001)、宁波大学浙江省重中之重学科开放基金
作者单位E-mail
姚日升 宁波市气象台 yaorisheng@aliyun.com 
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中文摘要:
      2013年12月1—10日宁波市出现历史罕见持续性重度污染事件。基于常规天气观测、浙江省自动气象站、宁波慈溪边界层风廓线雷达和凉帽山岛370 m高塔、宁波市和舟山市污染物监测等资料,应用美国NOAA HYSPLIT4模式进行粒子后向轨迹分析,并将CALMET诊断模式应用到WRF中尺度数值模式输出,对本次污染发展和消散过程宁波市3km以下气象要素进行精细化诊断分析,计算通风系数。结果表明:(1)合适的环流背景是污染发展和持续的主要原因。气溶胶粒子浓度增强过程中有3次弱冷空气影响,主要表现在800 m以上层次,为粒子的输送提供了好的动力条件,却又不影响边界层风速和稳定性。弱冷空气间歇期风力弱,风向快速变化,利于粒子的循环滞留。(2)污染发展和持续阶段宁波市区3000 m以下持续弱下沉气流,夜间边界层高度低,200 m以下存在明显逆温层,利于气溶胶粒子在低层的堆积和能见度的恶化。(3)污染发展和持续阶段夜间通风系数均小于1 m2/s,扩散条件很差,而污染消散阶段通风系数明显增大。没有外源性粒子输入时,通风系数与气溶胶粒子浓度呈负相关。
英文摘要:
      [Objective] Aerosol-related pollution studies have drawn attentions in recent years in the cities in East China. A rare persistent heavy pollution event occurred in Ningbo city during Dec.1 and 10,2013. [Data and methods] With the data from the conventional weather observations, the automatic weather stations of Zhejiang Province, the Cixi wind profiler and 370 m tower on the Ningbo Liangmaoshan island, and the pollutant data in Ningbo and Zhoushan cities, the NOAA HYSPLIT4 particle trajectory model and the WRF/CALMET diagnosis model were applied to investigate the particle trajectories in the boundary layer. [Results and conclusions] Results showed that: (1) Proper weather circulations played the main role for the outbreak of the pollution case. There were 3 weak cold air masses mainly affecting the levels above 800 m with the pollution enhancement, which provided favorable dynamic conditions for particle transportation, but little impact on wind speeds and stability at low levels in the boundary layer. The wind speeds were weak and directions changed quickly between the cold air intermittent periods, providing very good conditions for particle circulation and retention.(2) Both the low height of boundary layer and thermal inversion layer below 200 m were favorable for the aerosol accumulation and visibility deterioration.(3)It was in poor spreading condition with ventilation value less than 1 m2/s at night during haze lasting, and the ventilation value rose up significantly during the pollution weakening, it showed negatively correlated with the aerosol concentration when without exogenous particles.
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