Atmospheric 222Rn measurements during the 1993 NARE Intensive
Atmospheric 222Rn measurements during the 1993 NARE Intensive
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1993 年 NARE 强化期间的大气 222Rn 测量
DOI：
10.1029/96jd02029
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发表时间：
1996
影响因子：
--
通讯作者：
W. Broecker
中科院分区：
文献类型：
--
作者：
F. Zaucker;P. Daum;U. Wetterauer;C. Berkowitz;B. Kromer;W. Broecker
在本文中，我们描述了一种最近开发的技术，收集样品的大气222 Rn测量适合部署（研究）飞机。在对采样器进行技术说明之后，我们介绍了1993年北大西洋区域实验期间在北大西洋和加拿大新斯科舍省和新玩法附近的大陆上空密集进行的9次飞行的测量结果。在边界层和高达约5500米（msl）的自由对流层中取样。自由对流层的浓度范围为0.01至1.66 Bq/m3，平均值分别为1.66和0.52 Bq/m3。边界层222 Rn浓度与后弹道起源有很强的相关性，证实了222 Rn作为大陆气团示踪剂的用途。在海洋边界层（MBL）中收集的样品被认为是显着相关的气溶胶粒子，NOy，和O3浓度重申的效用氡作为示踪剂的大陆边界层空气。氡浓度的MBL样品没有被发现是显着相关的过境时间从大陆估计从回轨迹分析，这意味着氡浓度的变化主要是由放射性衰变以外的因素。据认为，这一因素是氡进入的大陆边界层的高度。放射性衰变的基础上，我们估计表观222 Rn年龄为我们的样品，并讨论了可靠的年龄估计固有的困难。与活动期间遇到的高度污染的空气羽流的碳氢化合物比率年龄估计值进行比较，发现这些样本的年龄范围相似，并表明同时测量具有不同化学和物理特性的物种可能会缩小这种年龄估计值的不确定性。
In this paper we describe a recently developed technique to collect samples for atmospheric 222Rn measurements suited for deployment on (research) aircraft. Following a technical description of the sampler we present measurements from nine flights during the 1993 North Atlantic Regional Experiment (NARE) intensive over the North Atlantic Ocean and over the continent in the vicinity of Nova Scotia and New Brunswick, Canada. Samples were taken both in the boundary layer and in the free troposphere up to about 5500 m (msl). Concentrations ranged from 0.01 to 1.66 Bq/m3 in the free troposphere, with means of 1.66 and 0.52 Bq/m3, respectively. Boundary layer 222Rn concentrations were strongly correlated with back trajectory origins confirming the use of 222Rn as tracer for continental air masses. Samples collected in the marine boundary layer (MBL) were found to be significantly correlated with aerosol particle, NOy, and O3 concentrations reaffirming the utility of radon as a tracer of continental boundary layer air. Radon concentrations for the MBL samples were not found to be significantly correlated with transit times from the continent as estimated from back trajectory analysis implying that variations in the radon concentrations are dominated by factors other than radioactive decay. It is suggested that this factor is the height of the continental boundary layer into which the radon is emitted. On the basis of the radioactive decay we estimated apparent 222Rn ages for our samples and discuss the inherent difficulties in reliable age estimates. A comparison with hydrocarbon ratio age estimates for a highly polluted plume of air encountered during the campaign shows a similar age range for these samples and suggests that simultaneous measurements of species with different chemical and physical properties might allow narrowing the uncertainties in such ages estimates.