Elevated middle and upper troposphere ozone observed downstream of Atlantic tropical cyclones
Elevated middle and upper troposphere ozone observed downstream of Atlantic tropical cyclones
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DOI：
10.1016/j.atmosenv.2015.07.025
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发表时间：
2015-10-01
影响因子：
5
通讯作者：
Neves, Luis
中科院分区：
文献类型：
--
作者：
Jenkins, Gregory S.;Robjhon, Miliaritiana L.;Neves, Luis
在2010年夏季飓风活动高峰期，在巴巴多斯和佛得角的西大西洋和东大西洋盆地的热带气旋下游，利用臭氧探测仪测量了臭氧的垂直分布。对热带气旋丹妮尔、厄尔、菲奥娜、加斯顿、朱莉娅和伊戈尔进行了测量。测量表明，臭氧与来自热带气旋的空气在5-10公里高度的混合比率增加。我们认为，观测到的与热带气旋相关的闪电活动和随后NOx的产生，以及热带气旋之前的高空外流和下沉以及来自西非的古老大陆外流，导致了观察到的臭氧混合率的增加。飓风Danielle对臭氧混合比的变化最大，8月22日至25日期间，对流层中部450百帕附近的臭氧混合率从25 ppb增加到70 ppb；对流层中低层变暖和干燥。佛得角的臭氧混合比率测量显示，在热带风暴朱莉娅通过之前，臭氧混合比率较高，但当风暴靠近时，臭氧混合比率较低，相对湿度高达300百帕。这很可能是由于海洋边界层垂直输送造成的。(C)2015爱思唯尔有限公司。保留所有权利。
During the peak period of hurricane activity in the summer of 2010, vertical profiles of ozone using ozonesondes were taken downstream of tropical cyclones in the Western and Eastern Atlantic Ocean basin at Barbados and Cape Verde. Measurements are taken for tropical cyclones Danielle, Earl, Fiona, Gaston, Julia and Igor. The measurements show an increase in ozone mixing ratios with air originating from the tropical cyclones at 5-10 km altitude. We suggest that observed lightning activity associated tropical cyclones and the subsequent production of NOx followed by upper level outflow and subsidence ahead of the tropical cyclones and aged continental outflow from West Africa thunderstorms produced observed increases in ozone mixing ratios. Hurricane Danielle showed the largest changes in ozone mixing ratio with values increasing from 25 ppb to 70 ppb between 22 and 25 August in the middle troposphere, near 450 hPa; warming and drying in the middle and lower troposphere. Measurements of ozone mixing ratios in Cape Verde show higher ozone mixing ratios prior to the passage of tropical storm Julia but low ozone mixing ratios and high relative humidity up to 300 hPa when the storm was in close proximity. This is due most likely the vertically transported from the marine boundary layer. (C) 2015 Elsevier Ltd. All rights reserved.