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首页> 外文期刊>Atmospheric chemistry and physics >Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data
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Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data

机译：通过热带气旋造成的亚洲季风在亚洲季风的脱水和低臭氧：利用时代和ERA5再分析数据的拉格朗日运输计算

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Low ozone and high water vapour mixing ratios are common features in the Asian summer monsoon (ASM) anticyclone; however, low ozone and low water vapour values were observed near the tropopause over Kunming, China, within the ASM using balloon-borne measurements performed during the SWOP (sounding water vapour, ozone, and particle) campaign in?August?2009 and 2015. Here, we investigate low ozone and water vapour signatures in the upper troposphere and lower stratosphere (UTLS) using FengYun-2D, FengYun-2G, and Aura Microwave Limb Sounder (MLS) satellite measurements and backward trajectory calculations. Trajectories with kinematic and diabatic vertical velocities were calculated using the Chemical Lagrangian Model of the Stratosphere (CLaMS) trajectory module driven by both ERA-Interim and ERA5 reanalysis data. All trajectory calculations show that air parcels with low ozone and low water vapour values in the UTLS over Kunming measured by balloon-borne instruments originate from the western Pacific boundary layer. Deep convection associated with tropical cyclones over the western Pacific transports ozone-poor air from the marine boundary layer to the cold tropopause region. Subsequently, these air parcels are mixed into the strong easterlies on the southern side of the Asian summer monsoon anticyclone. Air parcels are dehydrated when passing the lowest temperature region (?190 K) at the convective outflow of tropical cyclones. However, trajectory calculations show different vertical transport via deep convection depending on the employed reanalysis data (ERA-Interim, ERA5) and vertical velocities (diabatic, kinematic). Both the kinematic and the diabatic trajectory calculations using ERA5 data show much faster and stronger vertical transport than ERA-Interim primarily because of ERA5's better spatial and temporal resolution, which likely resolves convective events more accurately. Our findings show that the interplay between the ASM anticyclone and tropical cyclones has a significant impact on the chemical composition of the UTLS during summer.
机译：低臭氧和高水蒸汽混合比是亚洲夏季季风（ASM）抗岩中的常见特征;然而，在昆明，在中国昆明的昆明，在ASM中使用了低臭氧和低水蒸气值，使用了在速度（发声水蒸气，臭氧和粒子）活动期间进行的气球传播的测量，在八月？2009年和2015年。在这里，我们使用Fengyun-2D，Fengyun-2G和Aura微波肢体发声器（MLS）卫星测量和向后轨迹计算，研究了上层对流层和较低的平流层（UTL）中的低臭氧和水蒸气差异。使用ERA中期和ERA5再分析数据驱动的平流层（蛤蜊）轨迹模块的化学拉格朗日模型计算了运动和型垂直速度的轨迹。所有轨迹计算显示，通过气球传播仪器测量的UTLS在昆明的UTL中具有低臭氧和低水蒸汽值的空气包源自西太平洋边界层。与西太平洋的热带气旋相关的深对流将臭氧从海洋边界层传输到冷的对象般的对象区。随后，这些空气包裹被混合到亚洲夏季季风抗岩南侧的强烈东方。当在热带气旋的对流流出时通过最低温度区域（<α190k）时，空气包裹被脱水。然而，根据所采用的再分析数据（ERA-临时，ERA5）和垂直速度（糖尿病，运动），轨迹计算通过深度对流显示不同的垂直传输。使用ERA5数据的运动和糖尿病轨迹计算比ERA5的垂直传输比ERA-INSILIM更快，并且主要是因为ERA5的更好的空间和时间分辨率，这可能更准确地解决了对流事件。我们的研究结果表明，ASM反周气通和热带气旋之间的相互作用对夏季utls的化学成分产生了重大影响。

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