本文關(guān)鍵詞：2014年2月下旬京津冀持續(xù)重污染過(guò)程的靜穩(wěn)天氣及傳輸條件分析　出處：《環(huán)境科學(xué)學(xué)報(bào)》2016年12期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： 京津冀 重污染天氣 靜穩(wěn) 傳輸

【摘要】：利用常規(guī)氣象觀測(cè)資料、空氣質(zhì)量監(jiān)測(cè)資料、再分析資料和數(shù)值模式資料,分析了2014年2月20—26日京津冀地區(qū)持續(xù)重污染天氣過(guò)程的環(huán)流背景、氣象要素特征、靜穩(wěn)天氣條件和傳輸條件.結(jié)果表明:2月20—26日,亞洲東部受弱高壓脊控制,京津冀及周邊地區(qū)位于地面高壓后部,等壓線(xiàn)較為稀疏,氣壓梯度小,造成地面風(fēng)速較小;與此同時(shí),混合層高度低,通風(fēng)系數(shù)小和逆溫存在,構(gòu)成重污染天氣出現(xiàn)和維持的氣象條件,均不利于大氣中污染物和水汽的垂直和水平擴(kuò)散.靜穩(wěn)天氣指數(shù)對(duì)于重污染天氣有一定的指示意義,高靜穩(wěn)天氣指數(shù)通常對(duì)應(yīng)高PM2.5濃度,且二者變化趨勢(shì)一致性高;2月20—26日靜穩(wěn)天氣指數(shù)總體上大于2014年1—3月其他幾次污染過(guò)程,且在高位長(zhǎng)時(shí)間維持,造成此次污染過(guò)程更嚴(yán)重.此外,傳輸條件也是京津冀重污染天氣的主要成因:地面高壓西側(cè)的偏南或偏東氣流有助于污染物和水汽向京津冀地區(qū)輸送和聚集,使能見(jiàn)度進(jìn)一步降低、污染物濃度進(jìn)一步升高.
[Abstract]:Reanalysis data and numerical model by using the data of conventional meteorological data, the monitoring data of air quality, analyzes the continuing heavy pollution weather process in February 2014 20, the 26 day of the Beijing Tianjin Hebei region circulation background, characteristics, meteorological factors of calm weather conditions and transmission conditions. The results showed that: 20 - February 26, Eastern Asia by weak the high ridge, Tianjin and the surrounding area is located at the back of the high pressure, the isobars are sparse, the pressure gradient is small, causing the ground wind speed; at the same time, the mixed layer height is low, there is a small coefficient of inversion and ventilation, a heavy pollution weather occurrence and maintenance of the weather conditions are not conducive to pollutant and water vapor in the atmosphere of the vertical and horizontal diffusion. Static stability weather index has certain instruction significance for the heavy pollution weather, Gao Jing stable weather index usually corresponds to high PM2.5 concentration, and the change trend of the two high consistency in February 20; 26 days of calm weather index is generally larger than in 2014 1 to March several times the pollution process, and maintain high in the long time, the pollution caused by the process is more serious. In addition, the main causes of the transmission condition is Tianjin heavy pollution weather: South East or west of the ground high pressure gas flow contributes to pollutants and the water vapor transport to the Beijing Tianjin Hebei region and aggregation, to further reduce the concentration of pollutants, the visibility is further increased.
【作者單位】： 國(guó)家氣象中心;
【基金】：公益性行業(yè)(氣象)科研專(zhuān)項(xiàng)(No.GYHY201306015) 國(guó)家科技支撐計(jì)劃(No.2014BAC16B02) 氣象關(guān)鍵技術(shù)集成與應(yīng)用項(xiàng)目(No.CMAGJ2014 Z16)~~
【分類(lèi)號(hào)】：X51
【正文快照】： 1引言(Introduction)近幾年秋冬季,我國(guó)中東部地區(qū)頻繁遭受霧、霾天氣侵襲,尤其是2013年1月、2014年1、2月、2015年11月、12月爆發(fā)了多次大范圍持續(xù)性嚴(yán)重霧、霾過(guò)程,給人民群眾生產(chǎn)生活和身體健康帶來(lái)諸多不利影響.“霧霾”已成為公眾、媒體及相關(guān)科研業(yè)務(wù)單位關(guān)注的重點(diǎn)(張，

本文編號(hào)：1340156