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Nitrogen Oxides in the Arctic Marine Boundary Layer during the Polar Sunrise Experiment-2000

2000 年极地日出实验期间北极海洋边界层中的氮氧化物

基本信息

批准号：
9979497
负责人：
Richard Honrath
金额：
$ 20.05万
依托单位：
Michigan Technological University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1999
资助国家：
美国
起止时间：
1999-09-15 至 2001-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9979497&HistoricalAwards=false
关键词：
Nitrogen Oxides Arctic Marine Boundary

项目摘要

Honrath abstract Photochemical reactions of halogen compounds in the Arctic springtime atmosphere cause depletion of boundary-layer ozone, deposition of mercury to the arctic ecosystem, and halogen-mediated decomposition of organic compounds. However, key aspects of these processes are inadequately understood. The Polar Sunrise Experiment-2000 (PSE-2000) is designed to improve understanding of springtime boundary layer halogen chemistry and the role of surface snow as a source and sink of photochemically active compounds. Measurements and analyses of nitrogen oxides mixing ratios are proposed here as part of the PSE-2000 project. NO, NO2, and NOy will be determined at the PSE-2000 site near Alert, Nunavut, Canada, with gradient measurements of NOx and ancillary measurements of the N02 photodissociation rate constant and spectral actinic flux. The proposed N02 measurements will be used with measurements of BrO and other compounds by collaborating researchers to investigate the importance of these reactions to O3-depletion chemistry. Analyses of the NO-NO2 photostationary state will provide further insight into the importance of the BrO + NO2 = BrONO2 reaction and other NOx-sink reactions. Measurements of the vertical gradient of NOx and analysis of expected post-sunrise diurnal cycles in NOx and NOy will be used to investigate the role of the snow surface as a source and sink for photochemically active nitrogen oxide compounds.

北极春季大气中卤素化合物的光化学反应导致边界层臭氧的消耗，汞在北极生态系统中的沉积，以及卤素介导的有机化合物的分解。然而，这些过程的关键方面没有得到充分的理解。极地日出实验-2000（PSE-2000）的目的是提高春季边界层卤素化学和表面雪作为源和光化学活性化合物汇的作用的理解。作为PSE-2000项目的一部分，这里提出了氮氧化物混合比的测量和分析。 NO、NO2和NOy将在加拿大努纳武特阿勒特附近的PSE-2000站点进行测定，并对NOx进行梯度测量，并对NO2光解离速率常数和光谱光化通量进行辅助测量。提出的NO2测量将与合作研究人员对BrO和其他化合物的测量一起使用，以研究这些反应对O3消耗化学的重要性。 NO-NO2光稳定态的分析将提供进一步了解BrO + NO2 = BrONO 2反应和其他NOx汇反应的重要性。 NOx的垂直梯度的测量和预期日出后的NOx和NOy的昼夜周期的分析将被用来调查雪表面作为源和汇的光化学活性氮氧化物化合物的作用。