中国大气本底条件下不同地区地面臭氧特征

SURFACE OZONE CHARCACTERISTICS AT DIFFERENT AREAS UNDER ATMOSPHERICAL BACKGROUND CONDITIONS IN CHINA

中文关键词:  大气本底  地面臭氧  晴天  阴天

英文关键词:Atmospherical background  Surface O₃  Clear day  Cloudy day

中文摘要:

      分析了晴天和阴天时瓦里关本底台、临安和龙凤山本底站地面O₃浓度的特点。晴天时,临安站地面O₃有明显日变化,以春季最大(42.9×10^-9),夏季最小(20.3×10^-9);龙凤山站日变化更规则,秋季最大(约27×10^-9);瓦里关本底台除了夏季有微弱日变化外,其它季节没有明显的日变化,日较差也很小,但夏季地面O₃浓度显著高於冬季;夏季晴天瓦里关地面O₃浓度要比龙凤山、临安高20×10^-9以上。阴天时,临安和龙凤山站除了日变化不很规则和日较差较小外,其它大致与晴天相同。阴天时瓦里关不仅没有日变化,而且日较差更小,但夏季地面O₃仍然高於冬季。太阳总辐射和NOx浓度是控制龙凤山和临安晴天和阴天地面O₃浓度的决定性因子,它在不同季节和地区发挥着重要作用。夏季青藏高原周围地区气流向高原输送作用,是形成夏季瓦里关地面O₃高值以及微弱日变化的主要原因。在美国MaunaLoa基准站也曾观测到类似的输送影响。O₃在低对流层随垂直高度增加的分布特征,决定了东西部测点地面O₃的差异。

英文摘要:

      The characteristics of surface O₃ on clesr day,cloudy and rain dya at Waliguan observatory,Lin'an regional station and Longfengshan regional station were analyzed. There were obvious daily variation on clear dya at Lin'an.The maximum(42.9 ppb) and minimum(20.3 ppb) of daily varation presented in autumn and summer, respectively.The daily variation was more regularat Lonfengshan than at Lin'an.The max mum(about 27 ppb)presented in autumn at Lonfengshan.There was not obvious daily variation and also daily range was smallerin other seasons except summer(there were weak daily variation)at Wailiguan.Butthe surface O₃ concentration in summer was higher than winter.The surface O₃ concentration on clear day of summerat Waliguan was over 20 ppb higher than itat Longfengshan and Linan.Except daily variation was not very regularand daily range was smalleron overcastat Linan and Longfengshan,the others ere same to on clear day.There was non-daily variation. also daily range is smalleston overcastat Waliguan.Butthe surface O₃ concentration in summer was still higher than winter.Both golbal radiation adn NO_x concentration were main factors to control surface O₃ concentration on clear day and overcastat Longfengshan and Lin'an.They broutht into important play in different seasons and areas.The main reason for higherair pollutant concentration in summerat Waliguan was that airflow of higher air pollutant concentration of area around Qinghai-Tibetan plateau transported into this area.The similar effect of transportation was obtained at Mauna Loa observatory.The distribution characteristics of surface O₃ concentration increasing with vertical high in tro posphere decided the difference of surface O₃ between east and west in China.