| 大气环流型对珠三角2015~2020年臭氧变化的影响 |
| 摘要点击 1684 全文点击 978 投稿时间：2022-06-09 修订日期：2022-08-15 |
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| 中文关键词 珠三角(PRD) 臭氧(O3) Lamb-Jenkinson天气分型法(LWTs) 天气型 量化 天气类别 |
| 英文关键词 Pearl River Delta (PRD) ozone (O3) Lamb-Jenkinson weather typing (LWTs) method weather types quantification weather categories |
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| 中文摘要 |
| 基于2015~2020年的珠三角臭氧(O3)日最大8 h浓度平均值［MDA8 O3,ρ(O3-8h)］的观测数据和气象再分析数据,运用Lamb-Jenkinson天气分型法(LWTs)分析不同大气环流型的特征并定量其对MDA8 O3年际变化的贡献.结果表明,珠三角发生的18种天气型中ASW型更容易出现O3污染现象,而NE型会导致更严重的O3污染.根据850 hPa风场的风向变化及中心系统的不同位置将18种天气类型合并为5个天气类别来探讨不同天气型的O3生成机制,发现ρ(O3-8h)高的天气类别为N-E-S方向类别［(161±68)μg·m-3］和A类别［(122±39)μg·m-3］,二者ρ(O3-8h)与日最高气温和太阳净辐射量都呈显著正相关.N-E-S方向类别为秋季主导大气环流型,而A类别多发生在春季,其中春季珠三角发生的90% O3污染事件是由A类别控制.珠三角受大气环流频率和强度变化影响对MDA8 O3年际变化的贡献率为69%,天气型频率变化的贡献率为4%.MDA8 O3的年际波动与天气型强度密切相关,O3超标日天气型强度和频率对MDA8 O3年际波动的贡献相当. |
| 英文摘要 |
| Based on the ozone observation data and meteorological reanalysis data of the Pearl River Delta (PRD) from 2015 to 2020, the Lamb-Jenkinson weather typing method (LWTs) was used to analyze the characteristics of different circulation types and quantify their contributions to the interannual ozone variation. The results showed that there was a total of 18 weather types in PRD. Type ASW was more likely to occur with ozone pollution, and Type NE was associated with more serious ozone pollution. To better explore the ozone generation mechanism under different weather types, the 18 weather types were merged into five weather categories based on the wind direction change of the 850 hPa wind field and the different positions of the central system. The weather categories with high ozone concentration were the N-E-S directional category[(161±68) μg·m-3] and category A[(122±39) μg·m-3]. The ozone concentrations of these two categories were significantly positively correlated with the daily maximum temperature and the net amount of solar radiation. The N-E-S directional category was the dominant circulation pattern in autumn, whereas category A mostly occurred in spring, and 90% of the ozone pollution events occurring in PRD in spring were related to category A. The contribution of changes in atmospheric circulation frequency and intensity to interannual change in ozone concentration in PRD was 69%, and the contribution of changes in atmospheric circulation frequency alone was 4%. The changes in atmospheric circulation intensity and frequency on ozone-exceeding days contributed comparably to the interannual fluctuations in ozone pollution concentrations. |
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