Collaborative research: Quantifying the Sensitivity of Antarctic Snowpack Nitrate to Primary NOx Sources and Photodenitrification: Implications for the Ice Core Record

合作研究：量化南极积雪硝酸盐对主要氮氧化物来源和光脱氮作用的敏感性：对冰芯记录的影响

• 批准号: 0944537
• 负责人: Becky Alexander
• 金额: $ 25.06万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2013-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0944537&HistoricalAwards=false
• 关键词: Collaborative; research; Quantifying; Sensitivity; Antarctic

AbstractThe processes that form, transport and recycle the reactive forms of nitrogen in the atmosphere are important in global air quality, atmospheric nutrient deposition, and for controlling the long term oxidation capacity of the atmosphere. The NOx gases (NOx = NO + NO2) are also important greenhouse gases. The ultimate goal being pursued in this modeling study is the understanding of past (polar) atmospheric composition, and through a better accounting of the variability of contemporary atmospheric reactive nitrogen compounds as may be discerned from measurements of nitrate concentrations retained in snow, firn and ice cores on the Antarctic continent. The approach will use a inverse chemical transfer model (adjoint GEOS-Chem) to test the sensitivity of nitrate deposition to Antarctic ice from various possible sources. By integrating a snowpack radiative transfer subroutine into the chemical transport model, comparisons of calculated with observed fluxes of snowpack NOx at some observed inland and coastal Antarctic sites are to be used to parameterize photdenitrification rates. An additional question to be investigated with the developed modeling tools is what fraction of the nitrate concentration undergoing photolysis at the snow surface is recycled back to the atmosphere, or else preserved in the accreting ice.

大气中活性态氮的形成、传输和再循环过程对全球空气质量、大气营养物沉降和控制大气长期氧化能力具有重要意义。NOx气体（NOx = NO + NO2）也是重要的温室气体。在这一建模研究中追求的最终目标是过去（极地）的大气成分的理解，并通过当代大气活性氮化合物的变化，可以看出从测量保留在雪，积雪和冰芯在南极大陆的硝酸盐浓度的更好的会计。 该方法将使用逆化学转移模型（伴随GEOS-Chem）来测试硝酸盐沉积对各种可能来源的南极冰的敏感性。通过将积雪辐射传输子程序集成到化学传输模型中，计算与观测到的积雪氮氧化物的通量在一些观测到的内陆和沿海南极网站的比较被用来parametriumphotantenetrics率。 一个额外的问题，以研究与开发的建模工具是什么分数的硝酸盐浓度在雪表面进行光解回收到大气中，否则保存在积冰。