Analysis of long‐range transport events at Alert, Northwest Territories, during the Polar Sunrise Experiment
Analysis of long‐range transport events at Alert, Northwest Territories, during the Polar Sunrise Experiment
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极地日出实验期间西北地区阿勒特的远程传输事件分析
DOI：
10.1029/94jd01209
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发表时间：
1994
影响因子：
--
通讯作者：
I. Levin
中科院分区：
文献类型：
--
作者：
D. Worthy;N. Trivett;J. Hopper;J. Bottenheim;I. Levin
在“极地日出实验”期间（1992年1月16日至4月20日），在加拿大西北地区Alert（82°28′n, 62°30′w’）的加拿大基线大气监测观测站对二氧化碳、甲烷、黑碳、过氧乙酰硝酸盐、冷凝核和氡进行了现场测量。甲烷、二氧化碳、过氧乙酰硝酸盐和黑碳的时间序列在1月和2月经常高度相关，并在2至5天的明确发作期间出现。这与早些年的数据一致。在极地日出后不久，微量气体和气溶胶的时间变率都减弱了。使用黑碳浓度超过100 ng m−3的定义，定义了11个远程输送事件。拉格朗日5天回溯轨迹以及浓度数据被划分为六个地理区域，以表征主要事件。冬季变率与天气气象、弱垂直混合和来自西伯利亚和/或欧洲源区的快速气团输送有关。大气中氡子体（222Rn）活动的测量结果被用于进一步探索大陆物质穿越北极盆地的运输。
In situ measurements of carbon dioxide, methane, black carbon, peroxyacetylnitrate, condensation nuclei, and radon were made from the Canadian Baseline Atmospheric Monitoring Observatory at Alert, Northwest Territories, Canada (82°28′N, 62°30′W′) during the “Polar Sunrise Experiment” (January 16 to April 20, 1992). The time series of methane, carbon dioxide, peroxyacetylnitrate, and black carbon were frequently highly correlated during January and February during well-defined episodes lasting from 2 to 5 days. This is consistent with data from earlier years. Shortly after polar sunrise, the temporal variability in both trace gases and aerosols diminished. Using a definition of black carbon concentrations exceeding 100 ng m−3, 11 long-range transport episodes were defined. Lagrangian 5-day back trajectories along with the concentration data were classified into six geographical sectors to characterize the major episodes. The winter variability is related to synoptic meteorology, weak vertical mixing, and rapid air mass transport originating from Siberian and/or European source regions. Measurements of the radon daughter (222Rn) activity in the atmosphere were used to further explore the transport of continental material across the Arctic basin.