气候变化领域集成服务门户(CCPortal): Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition

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DOI	10.1016/j.atmosenv.2020.117973
	Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition
	He Y.; Mason R.P.
发表日期	2021
ISSN	1352-2310
卷号	244
英文摘要	Reactive gaseous mercury (RGHg) over the marine boundary layer (MBL) has been investigated in many oceans, such as the North Atlantic, Arctic and Antarctic using the KCl-coated denuder, as deployed in the Tekran instrument. Given recent concerns on the suitability of the denuder for capturing RGHg, we initiated a comparison study of RGHg concentrations measured by the KCl-coated denuder and with cation exchange membranes (CEM) during the Pacific GEOTRACES GP15 cruise between Alaska and Tahiti along 152°W from 18 September to November 24, 2018. RGHg concentrations measured by the KCl-coated denuder showed a strong variability along the cruise and ranged from 0.2 to 42.2 pg/m3 (average 7.2 pg/m3), while RGHg collected by the CEM similarly showed a large variability with a range from 10.7 to 143.3 pg/m3. However, a different pattern spatially and temporally was seen with the two measurement devices. Overall, RGHg concentrations measured by the CEM were, on average, 5 times higher than those measured by the KCl-coated denuder. In addition, the Tekran data suggest that occasional daily peaks of RGHg were associated with ozone depletion providing evidence for the formation of RGHg by reactions with reactive halogen species. A diurnal cycle in the RGHg concentration was observed in the low latitude tropical regions, likely caused by these photochemical reactions. Although the measurements by the denuder have better time resolution, and allow for examination of processes for RGHg formation, their efficiency of capture of RGHg needs to be further considered. This study suggested that using the KCl-coated denuder led to an underestimation of RGHg over the MBL, as found in previous studies. Therefore, further studies should be made to examine the measured RGHg concentrations over the MBL using different quantification approaches to further examine the distribution of RGHg. © 2020 Elsevier Ltd
关键词	Cation exchange membrane GEOTRACES GP15 KCl-Coated denuder Mercury Pacific Reactive gaseous mercury
语种	英语
scopus关键词	Boundary layers; Computational electromagnetics; Mercury (metal); Ozone layer; Photochemical reactions; Positive ions; Cation exchange membranes; Comparison study; Halogen species; Marine boundary layers; Measurement device; Reactive gaseous mercury; Time resolution; Tropical regions; Potassium compounds; mercury; potassium chloride; air pollution; Article; boundary layer; cation exchange; circadian rhythm; comparative study; controlled study; desorption; fluorescence; gas; humidity; limit of detection; ozone depletion; Pacific Ocean; photosynthetically active radiation; power supply; priority journal; surface property; wet deposition; Vindula arsinoe
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248810
作者单位	Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Road, Groton, CT 06340, United States
推荐引用方式 GB/T 7714	He Y.,Mason R.P.. Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition[J],2021,244.
APA	He Y.,&Mason R.P..(2021).Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition.ATMOSPHERIC ENVIRONMENT,244.
MLA	He Y.,et al."Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition".ATMOSPHERIC ENVIRONMENT 244(2021).