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
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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热带气旋引起的亚洲季风对流层顶层脱水和低臭氧：使用 ERA-Interim 和 ERA5 再分析数据进行拉格朗日输运计算
DOI：
10.5194/acp-2019-816
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发表时间：
2019-09
期刊：
影响因子：
--
通讯作者：
Dan Li
中科院分区：
文献类型：
--
作者：
Dan Li
抽象的。低臭氧和高水汽混合比是亚洲夏季风（ASM）反气旋的共同特征;然而，在2009年8月和2015年8月的SWOP（探测水汽，臭氧和粒子）活动期间，使用气球测量在中国昆明上空的对流层顶附近观测到低臭氧和低水汽值。
在这里，我们调查低臭氧和水汽签名在对流层上部和平流层下部（UTLS）使用风云-2D，风云-2G和Aura微波临边探测器（MLS）卫星测量和后向轨迹计算。
使用平流层化学拉格朗日模型（CLaMS）轨迹模块，由ERA-Interim和ERA 5再分析数据驱动，计算了具有运动学和非绝热垂直速度的轨迹。所有的轨迹计算表明，球载仪器测量的昆明UTLS低臭氧和低水汽值的空气包来自西太平洋边界层。
与西太平洋热带气旋相关的深对流将贫臭氧空气从海洋边界层输送到冷对流层顶区域。
随后，这些空气包混合到亚洲夏季风反气旋南侧的强东风中。
在热带气旋的对流流出区，当空气团通过最低温度区（< 190 K）时会脱水。
然而，轨迹计算显示不同的垂直输送通过深对流取决于所采用的再分析数据（ERA-Interim，ERA 5）和垂直速度（非绝热，运动学）。
使用ERA 5数据进行的运动学和非绝热轨道计算都显示出比ERA-Interim更快和更强的垂直传输，主要是因为ERA 5具有更好的空间和时间分辨率，可能更准确地解决对流事件。
我们的研究结果表明，ASM反气旋和热带气旋之间的相互作用有显着的影响，在夏季的UTLS的化学组成。
Abstract. 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.
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2013年亚洲夏季季风反气旋期间拉萨对流层高臭氧：对流输送和平流层入侵的影响
影响因子：
6.3
作者：
Dan Li;Bärbel Vogel;Rolf Müller;Jianchun Bian;Gebhard Günther;Qian Li;Jinqiang Zhang;Zhixuan Bai;Holger Vömel;Martin Riese
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R. Pommrich;R. Müller;J. Grooß;P. Konopka;F. Ploeger;B. Vogel;Mengchu Tao;C. Hoppe;G. Günther-G.
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
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影响因子：
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作者：
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影响因子：
3.8
作者：
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H. Vömel;T. Naebert;R. Dirksen;M. Sommer