Ozonesonde profiles from the West Pacific Warm Pool: measurements and validation
Ozonesonde profiles from the West Pacific Warm Pool: measurements and validation
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DOI：
10.5194/acp-16-619-2016
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发表时间：
2016-01
影响因子：
6.3
通讯作者：
R. Newton;G. Vaughan;H. Ricketts;L. Pan;A. Weinheimer;C. Chemel
中科院分区：
文献类型：
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作者：
R. Newton;G. Vaughan;H. Ricketts;L. Pan;A. Weinheimer;C. Chemel
抽象的。我们提出了一系列的臭氧探测仪剖面测量从马努斯岛，巴布亚新几内亚，在2014年2月，与新的见解校准臭氧探测仪测量在热带对流层。这次实验是一次更广泛的空中行动的一部分，该行动涉及驻扎在关岛的三架飞机，目的是以前所未有的详细程度探测热带西太平洋上空的大气成分。2月2日至25日期间发射了39个臭氧探测仪，其中34个探测仪提供了良好的臭氧概况。特别注意评估臭氧探测仪的背景气流，因为这可能相当于热带对流层顶层中测量信号的一半。一次意外的污染事件影响了测量结果，需要偏离臭氧探测仪的标准作业程序。最重要的偏离是在准备过程中没有将探测器暴露在臭氧中，这意味着在发射前本底电流保持稳定。通过与飞机测量值进行比较，可以验证所测得的臭氧剖面，并确认对于特征良好的探测器（背景电流<50 nA），可以假定整个剖面中的背景电流恒定，等于发射前准备期间测得的最小值。从这套34个臭氧探测仪中，TTL中测得的最低可重复臭氧浓度为12-13 ppbv;没有臭氧浓度的实例
Abstract. We present a series of ozonesonde profiles measured from Manus Island, Papua New Guinea, during February 2014, with new insights on the calibration of ozonesondes for measurements in the tropical troposphere. The experiment formed a part of a wider airborne campaign involving three aircraft based in Guam, to characterise the atmospheric composition above the tropical West Pacific in unprecedented detail. Thirty-nine ozonesondes were launched between 2 and 25 February of which 34 gave good ozone profiles. Particular attention was paid to evaluating the background current of the ozonesondes, as this can amount to half the measured signal in the tropical tropopause layer (TTL). An unexpected contamination event affected the measurements and required a departure from standard operating procedures for the ozonesondes. The most significant departure was not exposing the sondes to ozone during preparation, which meant that the background current remained stable before launch. Comparison with aircraft measurements allows validation of the measured ozone profiles and confirms that for well-characterized sondes (background current ∼ 50 nA) a constant background current could be assumed throughout the profile, equal to the minimum value measured during preparation just before launch. From this set of 34 ozonesondes, the minimum reproducible ozone concentration measured in the TTL was 12–13 ppbv; no examples of ozone concentrations