Analysis of the seasonal behavior of tropospheric ozone at Hong Kong
Analysis of the seasonal behavior of tropospheric ozone at Hong Kong
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DOI：
10.1016/s1352-2310(97)00320-8
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发表时间：
1998-01-01
影响因子：
5
通讯作者：
Harris, JM
中科院分区：
文献类型：
--
作者：
Chan, LY;Liu, HY;Harris, JM
自1993年以来，臭氧层探测器一直在香港（北纬22.2度，东经114.3度）发射。介绍了臭氧廓线的数据分析结果，重点是对流层臭氧的季节循环。结果表明，对流层臭氧柱在春季有一个明显的最大值，夏季有一个最小值。前者是北方许多地方的共同特征。夏季最小值是由于夏季风开始时，来自亚洲大陆的空气流被来自南中国海或热带太平洋的空气所取代。对流层臭氧对香港臭氧总量的季节变化有重要影响。2km以下臭氧混合比的季节变化呈双峰型，臭氧峰值出现在春季和秋季。在秋末和冬季经常观察到的一个特征是对流层上部（约9至16公里）臭氧混合比的相对最小值（低至30-40 ppbv）。轨迹分析表明，臭氧的相对最小值与来自热带地区的空气质量有关。这可能与东亚局地Hadley环流有关。(C)1977年爱思唯尔科学有限公司
Ozonesondes have been launched at Hong Kong (22.2 degrees N, 114.3 degrees E) since 1993. The results of data analysis of the ozone profiles are presented, with a focus on the seasonal cycle in tropospheric ozone. The results show that the tropospheric ozone column has an obvious maximum in spring and a minimum in summer. The former is a common feature at many locations in the Northern Hemisphere. The summer minimum is attributed to the onset of the summer monsoon when air flow from the Asian continent is replaced by air from the South China Sea or the tropical Pacific. The tropospheric ozone has an important influence on the seasonal cycle of total ozone at Hong Kong. The seasonal cycle of ozone mixing ratio below 2 km is bimodal with ozone peaks in spring and autumn. A frequently observed feature in late autumn and winter is a relative minimum of ozone mixing ratio (as low as 30-40 ppbv) in the upper troposphere (from about 9 to 16 km). Trajectory analysis shows this relative minimum of ozone is associated with air masses coming from the tropical region. It is proposed that the East Asia local Hadley circulation is responsible for this feature. (C) 1977 Elsevier Science Ltd.