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首页> 外文期刊>Atmospheric chemistry and physics >Atmospheric transport of persistent semi-volatile organic chemicals to the Arctic and cold condensation in the mid-troposphere – Part 2: 3-D modeling of episodic atmospheric transport
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Atmospheric transport of persistent semi-volatile organic chemicals to the Arctic and cold condensation in the mid-troposphere – Part 2: 3-D modeling of episodic atmospheric transport

机译：持久性半挥发性有机化学物质在大气中向北极的迁移和对流层中部的冷凝结第2部分：间歇性大气迁移的3-D模拟

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Two 3-dimensional global atmospheric transport models forpersistent organic pollutants (POPs) have been employed to investigate theassociation between the large-scale atmospheric motions and polewardtransports of persistent semi-volatile organic chemicals (SVOCs). We examinethe modeled daily air concentration of α- and γ-hexachlorocyclohexane(HCH) over a period from 1997 through 1999 duringwhich a number of episodic atmospheric transport events were detected inthis modeling study. These events provide modeling evidence for improvingthe interpretation on the cold condensation effect and poleward atmospherictransport of SVOCs in the mid-troposphere. Two episodic transport events ofγ-HCH (lindane) to the high Arctic (80–90° N), one from Asianand another from Eurasian sources, are reported in this paper. Both eventssuggest that the episodic atmospheric transports occurring in themid-troposphere (e.g. from 3000 m to 5500 m height) are driven byatmospheric horizontal and vertical motions. The association of thetransport events with atmospheric circulation is briefly discussed. Strongsoutherly winds, forced by the evolution of two semi-permanent high pressuresystems over mid-high latitudes in the Northern Hemisphere, play animportant role in the long-range transport (LRT) of HCHs to the highlatitudes from its sources. Being consistent with the cold condensationeffect and poleward atmospheric transport in a mean meridional atmosphericcirculation simulated by a 2-D atmospheric transport model, as reported bythe first part of this study, this modeling study indicates that coldcondensation is likely occurring more intensively in the mid-tropospherewhere rapid declining air temperature results in condensed phase of thechemical over and near its source regions and where stronger winds conveythe chemical more rapidly to the polar region during the episodic polewardatmospheric transport events.
机译：持久性有机污染物（POPs）的两个3维全球大气传输模型已被用于研究大规模大气运动与持久性半挥发性有机化学物质（SVOCs）的极向传输之间的联系。我们研究了1997年至1999年期间模拟的α-和γ-六氯环己烷（HCH）的每日空气浓度，在此建模研究中检测到了许多周期性的大气迁移事件。这些事件为进一步解释对流层中层SVOC的冷凝结效应和向极大气传输提供了建模依据。本文报道了两次H-六氯环己烷（林丹）向北极高海拔（80-90°N）的运输事件，一种是亚洲人的，另一种是欧亚来源的。这两个事件都表明在对流层中发生的偶发性大气传输（例如从3000 m到5500 m高度）是由大气水平和垂直运动驱动的。简要讨论了运输事件与大气环流的关系。北半球中高纬度地区的两个半永久高压系统的演变迫使强烈的强风在六氯环己烷从其源头向高纬度的长距离运输（LRT）中发挥了重要作用。正如本研究的第一部分所报道的那样，与二维大气传输模型模拟的平均子午大气环流中的冷凝结效应和极向大气的输运相一致，该模型研究表明冷凝结可能在对流层中部发生得更加强烈。迅速下降的空气温度导致化学物质在其源区上及其附近发生凝结，并且在偶发的极地大气传输事件中，较强的风将化学物质更快地输送到极地。

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