Significant latitudinal gradient in the surface ozone spring maximum over East Asia
Significant latitudinal gradient in the surface ozone spring maximum over East Asia
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DOI：
10.1029/2005gl023514
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发表时间：
2005-11
影响因子：
5.2
通讯作者：
H. Tanimoto;Y. Sawa;H. Matsueda;I. Uno;T. Ohara;K. Yamaji;J. Kurokawa;S. Yonemura
中科院分区：
文献类型：
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作者：
H. Tanimoto;Y. Sawa;H. Matsueda;I. Uno;T. Ohara;K. Yamaji;J. Kurokawa;S. Yonemura
通过整合日本监测网络的连续测量数据，在广泛的纬度范围内研究了东亚地区表面臭氧的气候学。虽然在所有7个偏远站点都观测到春季最大值和夏季最小值，但发现季节周期的显著纬度差异，特别是在春季。低纬度地区（20 ~ 30°N）春季最大值出现在3月，高纬度地区（40 ~ 50°N）春季最大值出现在4月，中纬度地区（30 ~ 40°N）春季最大值出现在5月。一个区域尺度的化学输运模式被应用于研究对观测到的纬度依赖性有贡献的因子。该模式较好地再现了东亚地区的纬度梯度和整体季节变化，表明亚洲大陆外流的运输模式与光化学耦合导致了东亚地区的纬度不均匀性。这些结果强调了动力过程在调节地表臭氧峰值的振幅和相位方面的关键作用。
The climatology of surface ozone over East Asia was investigated at a wide range of latitudes by integrating continuous measurements from Japanese monitoring networks. Although a spring maximum and a summer minimum were observed at all seven remote stations, significant latitudinal differences in the seasonal cycles were found, particularly in spring. At low latitudes (20–30°N) the spring maximum appears in March, while it appears in April at high latitudes (40–50°N), and in May at middle latitudes (30–40°N). A regional‐scale chemical transport model was applied to examine factors contributing to the latitudinal dependence observed. The model reproduces the latitudinal gradient and the overall seasonal variations well, and suggests that transport patterns of Asian continental outflow coupled with photochemistry result in latitudinal inhomogeneity over East Asia. These results highlight the key role of dynamical processes in modulating the amplitude and phase of the spring maximum in surface ozone.