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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >MEASUREMENTS OF PHOTOLYZABLE CHLORINE AND BROMINE DURING THE POLAR SUNRISE EXPERIMENT 1995
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MEASUREMENTS OF PHOTOLYZABLE CHLORINE AND BROMINE DURING THE POLAR SUNRISE EXPERIMENT 1995

机译：1995年极地日照实验期间光解氯和溴的测量

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摘要

We report measurements of rapidly photolyzable chlorine (Cl-p; e.g., Cl-2 and HOCl) and bromine (Br-p; e.g., Br-2 and HOBr) in the high Arctic using a newly developed photoactive halogen detector (PHD). Ground level ambient air was sampled daily from mid-February through mid-April in the Canadian Arctic at Alert, Northwest Territories (82.5 degrees N, 62.3 degrees W), as part of the Polar Sunrise Experiment (PSE) 1995. Concentrations of ''total photolyzable chlorine'' varied from <9 to 100 pptv as Cl-2 and that of ''total photolyzable bromine'' from <4 to 38 pptv as Br-2. High concentration episodes of chlorine were observed only prior to sunrise (March 21), while high concentration episodes of bromine were measured throughout the study. The high concentrations of photolyzable chlorine and bromine prior to sunrise suggest a ''dark'' production mechanism that we assume yields Cl-2 and Br-2. An inverse correlation of bromine with ozone is clearly present in one major ozone depletion episode at the end of March. A trajectory analysis, taken with the differences in measured levels of photolyzable chlorine and bromine after sunrise, imply different production mechanisms for these two types of species. A steady state analysis of the data for one ozone depletion episode suggests a [Br]/[Cl] ratio in the range 100-300. The high concentrations of photolyzable bromine after sunrise imply the existence of a precursor other than aerosol bromide. [References: 28]
机译：我们报告了使用最新开发的光敏卤素检测器（PHD）在北极高海拔地区对可快速光解氯（Cl-p;例如Cl-2和HOCl）和溴（Br-p;例如Br-2和HOBr）的测量结果。作为1995年极地日出实验（PSE）的一部分，每天从2月中旬到4月中旬在加拿大北极地区西北部的Alert抽取地面水平的大气（北纬82.5度，W 62.3度）。 Cl-2的总光分解氯含量<9至100 pptv，Br-2的总光分解氯含量<4至38 pptv。仅在日出前（3月21日）才观察到高浓度的氯发作，而在整个研究过程中都测得了高浓度的溴发作。日出前高浓度的可光解氯和溴表明我们假设产生Cl-2和Br-2的“暗”生产机理。在三月底的一个主要的臭氧消耗事件中，显然与溴和臭氧成反比。根据日出后光解性氯和溴的测量水平的差异进行的轨迹分析表明，这两种物种的生产机制不同。对一个臭氧消耗事件的数据进行的稳态分析表明[Br] / [Cl]比在100-300的范围内。日出后高浓度的可光解溴意味着存在除气溶胶溴化物以外的其他前体。 [参考：28]

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