Double core of ozone valley over the Tibetan Plateau and its possible mechanisms
Double core of ozone valley over the Tibetan Plateau and its possible mechanisms
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DOI：
10.1016/j.jastp.2015.05.018
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发表时间：
2015-08
影响因子：
1.9
通讯作者：
Dong Guo;Yucheng Su;C. Shi;Jianjun Xu;A. Powell
中科院分区：
文献类型：
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作者：
Dong Guo;Yucheng Su;C. Shi;Jianjun Xu;A. Powell
利用2005 - 2013年微波临边探测器（MLS）臭氧（O3）资料，研究了青藏高原夏季（6 - 8月）臭氧谷（即臭氧损耗）的三维结构。TP上空的臭氧谷存在一个双芯结构，一个位于平流层上部（10 ~（-2）hPa）的耗尽中心称为上芯，另一个位于对流层上部/平流层下部（200-50 hPa）的耗尽中心称为下芯。分析表明，臭氧O3*（O3*=O3-[O3]，这里[O3]是O3的纬向平均值）在上芯的纬向偏差接近-1 DU，而其对应物在下芯的偏差接近-15 DU。大尺度大气环流和地形效应对低层臭氧谷的形成起着重要作用。相反，奇数氯包括氯原子（Cl）和一氧化氯（ClO）的光化学反应在上核的臭氧谷占主导地位。基于MLS产品，对上层核心化学驱动因子的支持基于：（1）臭氧的显著日变化表明可能存在影响臭氧谷的光化学反应;（2）ClO纬向偏差（CLO ~*）和HCl纬向偏差（HCl ~*）的正中心位于上堆芯底部，这意味着较高的奇数氯可能加速臭氧损失。
In this study, the three-dimensional structure of theozone valley(e.g. ozone depletion) over the Tibetan Plateau (TP) in summer (June–August) has been investigated using Microwave Limb Sounder (MLS) ozone (O3) data from 2005 to 2013. A double core structure of the ozone valleyover the TP is found with one depletion center in upper stratosphere (10–2 hPa) named the upper core, and another depletion center, named the lower core, is observed in the upper troposphere/lower stratosphere (200–50 hPa). The analysis indicates that the zonal deviation of ozone O3*(O3*=O3–[O3], here [O3] is the zonal mean of O3) at the upper core is nearly −1 DU while its counterpart's deviation at the lower core is nearly –15 DU. Large scale atmospheric circulation and terrain effects play an important role in the ozone valleyat the lower core. In contrast, photochemistry reactions of odd chlorine including chlorine atoms (Cl) and chlorine monoxide (ClO) dominate theozone valleyat the upper core. Based on the MLS products, support for a chemical driver at the upper core is based on: (1) the significant diurnal variability of ozone suggests possible photochemistry reactions impacting theozone valley; (2) the positive center of the ClO zonal deviation (CLO*) and hydrogen chloride (HCl) zonal deviation (HCl*) are found at the bottom of the upper core, which means the higher odd chlorine may accelerate the ozone loss.