Boundary-Layer Characteristics of Persistent Regional Haze Events and Heavy Haze Days in Eastern China

Peng Huaqing,Shen Hao,Liu Duanyang,Cao Lu,Su Yan,Wu Jiamei,Wei Jiansu,Zhou Bin

doi:10.1155/2016/6950154

Abstract

This paper analyzed the surface conditions and boundary-layer climate of regional haze events and heavy haze in southern Jiangsu Province in China. There are 5 types with the surface conditions which are equalized pressure (EQP), the advancing edge of a cold front (ACF), the base of high pressure (BOH), the backside of high pressure (BAH), the inverted trough of low pressure (INT), and saddle pressure (SAP) with the haze days. At that time, 4 types are divided with the regional haze events and each of which has a different boundary-layer structure. During heavy haze, the surface mainly experiences EQP, ACF, BOH, BAH, and INT which also have different boundary-layer structures.

Highlights

The people of East China, the Yangtze River Delta, and the Pearl River Delta have been subjected to health risks due to haze since the 21st century, during autumn and winter
The main conclusions are as follows: (1) The surface conditions were dominated by equalized pressure (EQP), the advancing edge of a cold front (ACF), the base of high pressure (BOH), the backside of high pressure (BAH), the inverted trough of low pressure (INT), and saddle pressure (SAP)
(2) Based on the surface conditions, regional haze events could be divided into 4 types, each of which has a different boundary-layer structure

Summary

Introduction

The people of East China, the Yangtze River Delta, and the Pearl River Delta have been subjected to health risks due to haze since the 21st century, during autumn and winter. Pearl River Delta, experts found that the regional haze process was related to the airflow stagnation zone, where pollutants accumulate in the boundary layer; pollution becomes highly concentrated near the surface to form haze [28,29,30]. Xu et al [44] suggested that a thick temperature inversion layer occurred near the surface on haze days. Many experts suggest that a stable temperature inversion, weak atmospheric turbulence, and low winds are the main causes of haze [47,48,49,50,51,52,53,54].

Data and Methods

Results

Boundary-Layer Structures of Regional Haze

Conclusions