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王启璐, 徐雯雯, 涂静怡, 等. 2023. 1979~2020年北极和青藏高原臭氧低值区的动力输送特征比较[J]. 大气科学, 47(3): 866−880. DOI: 10.3878/j.issn.1006-9895.2203.21156
引用本文: 王启璐, 徐雯雯, 涂静怡, 等. 2023. 1979~2020年北极和青藏高原臭氧低值区的动力输送特征比较[J]. 大气科学, 47(3): 866−880. DOI: 10.3878/j.issn.1006-9895.2203.21156
WANG Qilu, XU Wenwen, TU Jingyi, et al. 2023. Comparison of the Dynamic Transport Characteristics of Low Ozone Regions over the Arctic and the Tibetan Plateau from 1979 to 2020 [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(3): 866−880. DOI: 10.3878/j.issn.1006-9895.2203.21156
Citation: WANG Qilu, XU Wenwen, TU Jingyi, et al. 2023. Comparison of the Dynamic Transport Characteristics of Low Ozone Regions over the Arctic and the Tibetan Plateau from 1979 to 2020 [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(3): 866−880. DOI: 10.3878/j.issn.1006-9895.2203.21156

1979~2020年北极和青藏高原臭氧低值区的动力输送特征比较

Comparison of the Dynamic Transport Characteristics of Low Ozone Regions over the Arctic and the Tibetan Plateau from 1979 to 2020

  • 摘要: 基于ERA5月平均再分析资料,利用Lorenz环流分解方法从定常和瞬变以及基流和涡旋的角度对比了北极与青藏高原臭氧低值区的动力输送特征。结果表明:动力总输送在两地上平流层作用最强,均使其臭氧浓度降低,且定常输送均强于瞬变输送,纬向与经向输送的作用均大致相反。然而,动力输送在北极地区的作用强度远大于青藏高原地区。北极地区纬向输送使得平流层中上层臭氧浓度降低,平流层下层臭氧浓度升高,经向输送的作用与之相反且强度明显偏弱,二者均主要作用于上平流层。青藏高原地区纬向和经向输送除在上平流层均使得臭氧浓度降低外,二者作用大致相反且强度相当,输送大值区在垂直方向上存在双中心结构,分别位于上平流层与上对流层—下平流层(Upper Troposphere–Lower Stratosphere,简称UTLS)区。两地区纬向和经向输送的差异均主要由定常涡旋输送所造成。青藏高原地区定常与瞬变输送的强度差异没有北极地区大。此外,两地定常和瞬变输送中涡旋对臭氧纬向平均的输送均起到主要作用,体现出涡旋输送在两地臭氧浓度变化的动力输送过程中发挥着至关重要的作用。

     

    Abstract: Based on the monthly ERA5 reanalysis datasets, this study considers the mean flows and eddies in stationary or transient transport using the Lorenz circulation decomposition method. The purpose is to compare the dynamic transport characteristics of ozone over the Arctic and the Tibetan Plateau in detail. Results show that the effect of dynamic transport is strongest in the upper stratosphere of these two regions, which leads to the reduction of ozone. Further analyses indicate that the effect of stationary transport is stronger than that of transient transport and zonal and meridional transports nearly have the opposite effect. However, the intensity of dynamic transport over the Arctic is greater than that over the Tibetan Plateau. Zonal transport over the Arctic results in the reduction of ozone in the upper and middle stratosphere and the increase of ozone in the lower stratosphere, whereas the effect of meridional transport is the opposite and weaker. Both mainly function in the upper stratosphere. Over the Tibetan Plateau, the intensity of zonal transport is the same as that of meridional transport. They nearly have the opposite effect, except for the top of the stratosphere, where both lead to the reduction of ozone. Two centers with the strongest transport are located over the Tibetan Plateau, that is, in the upper stratosphere and the upper troposphere–lower stratosphere. The differences in zonal and meridional transports over these two regions are mainly caused by stationary transport by eddies. The differences in stationary and transient transports over the Tibetan Plateau are smaller than those over the Arctic. Furthermore, the transport of zonal mean ozone by eddies plays a dominant role in stationary and transient transports. Consequently, eddy transport exerts an indispensable influence on the dynamic transport of ozone over the Arctic and the Tibetan Plateau.

     

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