Direct transport of midlatitude stratospheric ozone into the lower troposphere and marine boundary layer of the tropical Pacific Ocean -: art. no. D23310
Direct transport of midlatitude stratospheric ozone into the lower troposphere and marine boundary layer of the tropical Pacific Ocean -: art. no. D23310
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DOI：
10.1029/2005jd005783
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发表时间：
2005-12-13
影响因子：
4.4
通讯作者：
Lefohn, AS
中科院分区：
文献类型：
--
作者：
Cooper, OR;Stohl, A;Lefohn, AS
2004年1月19日至29日和2月28日至3月15日在夏威夷的檀香山进行的太平洋次热带急流研究的目标之一是详细调查中纬度平流层侵入物侵入北方热带地区的情况。我们使用国家海洋和大气管理局的G-IV喷气式飞机，配备下投式探空仪和1秒分辨率的臭氧仪器，于2月29日瞄准了夏威夷上空的入侵。这些数据描述了在夏威夷上空测得的最强对流层臭氧增强（与22年臭氧探测仪记录相比），并说明了平流层臭氧与对流层中部的混合，这是相对寒冷的中纬度空气平流进入热带地区引发对流的结果。G-IV和莫纳罗亚山天文台（3.4公里）的测量结果显示，对流层低层的臭氧增强，表明入侵的残余物达到了这些水平。使用FLEXPART拉格朗日粒子扩散模型生成的平流层臭氧示踪剂进行的一项研究支持了这一结论。本文还描述了一个类似的入侵，增强臭氧在莫纳罗亚山3月10日，以及檀香山，这是位于海洋边界层。进出檀香山的G-IV航班多次测量到与这一事件有关的臭氧增强。3月10日的事件输送到热带对流层的臭氧估计为1.75 Tg，我们认为，平流层入侵，打破了极地急流，因为他们平流进入热带地区更有效地输送臭氧进入对流层比入侵，仍然接近极地急流在中纬度地区。对动力条件的分析表明，平流层侵入的频率在2004年1月至3月期间没有异常。虽然3月10日的事件本身是一个极端事件，但可以预期，强烈的平流层侵入在任何一年都会影响热带对流层低层。
The detailed survey of midlatitude stratospheric intrusions penetrating into the Northern Hemisphere tropics was one goal of the Pacific Sub-Tropical Jet Study 2004, conducted from Honolulu, Hawaii, during 19-29 January and 28 February to 15 March. Using the National Oceanic and Atmospheric Administration G-IV jet aircraft, instrumented with dropsondes and a 1-s resolution ozone instrument, we targeted an intrusion above Hawaii on 29 February. The data describe the strongest tropospheric ozone enhancements ever measured above Hawaii (in comparison to a 22 year ozonesonde record) and illustrate the mixing of stratospheric ozone into the midtroposphere as a result of convection triggered by the advection of relatively cold midlatitude air into the tropics. Measurements from the G-IV and Mauna Loa Observatory (3.4 km) show enhanced ozone in the lower troposphere, indicating that the remnants of the intrusion reached these levels. This conclusion is supported by a study using a stratospheric ozone tracer generated by the FLEXPART Lagrangian particle dispersion model. This paper also describes a similar intrusion that enhanced ozone at Mauna Loa on 10 March, as well as Honolulu, which is located in the marine boundary layer. G-IV flights in and out of Honolulu measured enhanced ozone associated with this event on several occasions. The 10 March event transported an estimated 1.75 Tg of ozone into the tropical troposphere, and we suggest that stratospheric intrusions that break away from the polar jet stream as they advect into the tropics are more effective at transporting ozone into the troposphere than intrusions that remain close to the polar jet stream in midlatitudes. Analysis of the dynamic conditions indicates that the frequency of stratospheric intrusions was not anomalous during January-March 2004. While the 10 March event was by itself an extreme event, strong stratospheric intrusions can be expected to influence the tropical lower troposphere in any year.