Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition
Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition
复制标题
太平洋 GEOTRACES GP15 探险期间 KCl 涂层剥蚀器和阳离子交换膜测量的活性气态汞的比较
DOI：
10.1016/j.atmosenv.2020.117973
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发表时间：
2021
影响因子：
5
通讯作者：
Mason, Robert P.
中科院分区：
文献类型：
--
作者：
He, Yipeng;Mason, Robert P.
在许多海洋，例如北大西洋、北极和南极，已经使用Tekran仪器中部署的kcl包覆的白晶石对海洋边界层（MBL）上的活性气态汞（RGHg）进行了研究。考虑到近期人们对珠光膜捕获RGHg的适用性的担忧，我们在2018年9月18日至11月24日沿152°W在阿拉斯加和塔希提岛之间的Pacific GEOTRACES GP15巡航期间，对kcl涂层珠光膜和阳离子交换膜（CEM）测量的RGHg浓度进行了比较研究。由kcl包覆的海水测量的RGHg浓度在巡航过程中表现出很强的变异性，范围从0.2到42.2 pg/m3（平均7.2 pg/m3），而CEM收集的RGHg同样表现出很大的变异性，范围从10.7到143.3 pg/m3。然而，两种测量装置在空间和时间上观察到不同的模式。总体而言，CEM测量的RGHg浓度平均比kcl包覆的光秃石高5倍。此外，Tekran数据表明，RGHg的偶尔每日峰值与臭氧消耗有关，这为RGHg通过与活性卤素物质的反应形成提供了证据。在低纬度热带地区观测到RGHg浓度的日循环，可能是由这些光化学反应引起的。尽管珠光仪的测量具有更好的时间分辨率，并允许检查RGHg形成的过程，但它们捕获RGHg的效率需要进一步考虑。这项研究表明，与之前的研究一样，使用kcl包覆的珠光膜会导致MBL上RGHg的低估。因此，需要进一步研究使用不同的量化方法来检验MBL上测量的RGHg浓度，以进一步研究RGHg的分布。
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.
高 Hg<sup>0</sup> 和 HgBr<sub>2</sub> 浓度下阳离子交换膜性能评估
影响因子：
3.8
作者：
Miller, Matthieu B.;Dunham-Cheatham, Sarrah M.;Gustin, Mae Sexauer;Edwards, Grant C.
通讯作者：
Edwards, Grant C.
影响因子：
11.4
作者：
Soerensen, Anne L.;Mason, Robert P.;Sunderland, Elsie M.
通讯作者：
Sunderland, Elsie M.
DOI：
10.1016/j.dsr.2018.12.001
发表时间：
2019-02-01
影响因子：
2.4
作者：
DiMento, Brian P.;Mason, Robert P.;Moore, Chris
通讯作者：
Moore, Chris