Springtime Bromine Activation over Coastal and Inland Arctic Snowpacks
Springtime Bromine Activation over Coastal and Inland Arctic Snowpacks
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春季沿海和内陆北极积雪上的溴活化
DOI：
10.1021/acsearthspacechem.8b00083
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发表时间：
--
影响因子：
3.4
通讯作者：
Shepson
中科院分区：
文献类型：
--
作者：
Peterson;Pöhler;Zielcke;General;Frieß;Simpson;Nghiem;Shepson
随着极地春季阳光的回归，积雪成为北极边界层分子卤素的有效来源。反应性溴的产生和相关的臭氧消耗通常与海冰地区有关;然而，在沿海地区内陆发生卤素化学的程度尚不清楚。在2012年3月的溴、臭氧和汞实验（BROMEX）中，机载最低点扫描差分光学吸收光谱法探测了阿拉斯加Utqiag今维克附近海冰和苔原地区的BrO空间分布。我们观察到增强溴低对流层垂直柱密度（LT-VCD）高达200公里的内陆。垂直剖面显示，溴位于积雪表面附近，与先前的研究积雪化学成分显示溴富集，这是气相溴物种的沉积到积雪相一致。在横跨阿拉斯加北极的9次飞行中，在积雪覆盖的苔原地区而不是海冰地区观察到最高的溴氧LT-VCD，尽管所有地点的变化都很大。表征观测到的BrO在北方阿拉斯加的臭氧条件下，在乌特恰格今维克的反应表明，区域BrO水平最高的时候，臭氧摩尔分数下降，符合当地发生的化学破坏臭氧的溴化学。这些研究结果表明，虽然溴的活化最常见于海冰地区，但内陆苔原积雪使活性溴的运输和回收成为可能，从而将这种卤素化学及其相关影响进一步扩展到内陆。
With the return of sunlight in the polar spring, the snowpack serves as an effective source of molecular halogens to the Arctic boundary layer. Reactive bromine production and associated ozone depletion are typically associated with sea ice regions; however, the extent to which halogen chemistry occurs inland in coastal regions is unknown. During the March 2012 bromine, ozone, and mercury experiment (BROMEX), airborne nadir scanning differential optical absorption spectroscopy probed the spatial distribution of BrO over sea ice and tundra regions near Utqiaġvik, Alaska. We observed enhanced BrO lower tropospheric vertical column densities (LT-VCDs) up to 200 km inland. Vertical profiles showed that BrO was located near the snowpack surface, consistent with prior studies of snowpack chemical composition showing bromide enrichment, which is indicative of deposition of gas-phase bromine species to the snowpack. Over nine flights across the Alaskan Arctic, the highest BrO LT-VCDs were observed over snow-covered tundra regions rather than sea ice regions, although the variability was large at all locations. Characterization of the response of observed BrO over northern Alaska to ozone conditions at Utqiaġvik showed that regional BrO levels were highest during times when ozone mole fractions were decreasing, consistent with locally occurring chemical destruction of ozone by bromine chemistry. These findings suggest that, while bromine activation is most commonly associated with sea ice regions, inland tundra snowpacks enable the transport and recycling of reactive bromine, extending this halogen chemistry and its associated impacts further inland.
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影响因子：
6.3
作者：
P. Peterson;W. Simpson;K. Pratt;P. Shepson;U. Friess;J. Zielcke;U. Platt;S. Walsh;S. Nghiem-
通讯作者：
P. Peterson;W. Simpson;K. Pratt;P. Shepson;U. Friess;J. Zielcke;U. Platt;S. Walsh;S. Nghiem-
一氧化溴 MAX-DOAS 探测活性溴事件的水平和垂直结构
影响因子：
6.3
作者：
Simpson;Peterson;Frieß;Sihler;Lampel;Shepson;Halfacre;Nghiem
通讯作者：
Nghiem
影响因子：
6.3
作者：
K. Custard;C. Thompson;K. Pratt;P. Shepson;J. Liao;L. G. Huey;J. Orlando;A. Weinheimer;E. Apel;S. Hall;F. Flocke;L. Mauldin;R. Hornbrook;D. Pöhler;S. General;J. Zielcke;W. Simpson;U. Platt;A. Fried;P. Weibring;B. Sive;K. Ullmann;C. Cantrell;D. Knapp;D. Montzka
通讯作者：
K. Custard;C. Thompson;K. Pratt;P. Shepson;J. Liao;L. G. Huey;J. Orlando;A. Weinheimer;E. Apel;S. Hall;F. Flocke;L. Mauldin;R. Hornbrook;D. Pöhler;S. General;J. Zielcke;W. Simpson;U. Platt;A. Fried;P. Weibring;B. Sive;K. Ullmann;C. Cantrell;D. Knapp;D. Montzka
GSHOX 期间 Summit 雪、冷空气和大气边界层中的溴化物和其他离子
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
J. Dibb;L. Ziemba;J. Luxford;P. Beckman
通讯作者：
P. Beckman
气相物质的沉积如何影响冷冻盐界面的 pH 值
影响因子：
6.3
作者：
S. Wren;D. Donaldson
通讯作者：
D. Donaldson