Collaborative Research: Responses of atmospheric oxidants and CO2 to dramatic changes in Arctic sea ice

合作研究：大气氧化剂和二氧化碳对北极海冰剧烈变化的反应

• 批准号: 1602716
• 负责人: William Simpson
• 金额: $ 23.3万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1602716&HistoricalAwards=false
• 关键词: Collaborative; Research; Responses; atmospheric; oxidants

The Arctic region has unique atmospheric chemistry leading to both positive and negative human health impacts, such as the depletion of ground-level ozone and the deposition of mercury. Atmospheric carbon dioxide uptake into sea water, moderated by the time-varying amount of sea ice cover, causes acidification of Arctic Ocean waters with potentially important impacts on the marine ecosystem. One expects that the atmosphere and its chemistry will respond in a complex manner to sea ice change and Arctic warming, but the science community lacks the ability to make predictions with confidence given only basic mechanistic understanding of the relevant processes. The O-Buoy Chemical Network project was funded under an Arctic Observing Network grant to observe atmospheric chemicals, meteorology, and sea-ice properties that can improve our understanding of the relevant processes and thus improve predictability of scenarios of future climate. That project has deployed fifteen autonomous buoys measuring three sentinel atmospheric chemical species, each for roughly a year?s time, spread across the Arctic Ocean, providing detailed, high-time-resolution data relevant to understanding the Arctic atmosphere?s chemistry in relation to sea ice. In this project, the science team will synthesize, interpret, and generate fundamental understanding from the O-Buoy network data. In addition, GEOS-Chem modeling combined with the O-Buoy measurements will be used to develop a region wide understanding of the relationship between the Arctic atmosphere and sea ice.This project will contribute to STEM manpower development in a number of ways. It will provide support for an early career scientist during the formative years of his career. It will support the training of three Ph.D. students and engage multiple undergraduate students. Efforts will be made to draw these latter students from groups under-represented in the STEM fields by leveraging the resources of the Dartmouth College Women in Science Program (WISP) and the Alaska Native Science and Engineering Program (ANSEP) at the University of Alaska. Outreach to the K - gray community will be enabled through leveraging of existing programs such as the NSF-funded Next Generation WeatherBlur Project, the US Army Corps of Engineers' Cold Regions Research and Engineering Laboratory's summer science camp for New Hampshire middle school students, the University of Alaska's annual Spring Science Potpourri open house, the weekly Café Scientifique in Boothbay Harbor, Maine: a summer lecture series that promotes public engagement with cutting-edge scientific research, and the extensive web presence of the Bigelow Laboratory for Ocean Sciences. The Arctic Ocean's overlying atmosphere is characterized by production of reactive halogen oxidizers from sea salts that lead to depletion of ground-level ozone and deposition of mercury. This production is believed to be modulated by the state of the sea ice cover. This project will answer three specific science questions relevant to the overarching question "How do changes in the Arctic Ocean environment, especially sea ice, affect the atmosphere?" via statistical analysis and modeling approaches. Statistical methods will test and improve process understanding while modeling approaches will be used to improve quantification of gas exchange fluxes with the Arctic Ocean through the fractured, drifting, sea ice and to predict fluxes of reactive halogen oxidizers and their precursors from sea ice. These modeling exercises make full use of the data from the O-Buoys covering the Arctic Ocean region from 2009-2016+, a period which has had a great deal of sea ice variability and reduced sea ice compared to historical averages. The three specific questions constituting the foci for this project are:Q1: Under what conditions are carbon dioxide air-ice-ocean fluxes important causes of atmospheric carbon dioxide variability over the Arctic Ocean and, conversely, when is long-range transport important?Q2: How do Arctic Ocean sea ice, snow, and vertical mixing conditions affect major atmospheric oxidants (ozone and reactive halogens)?Q3: How do interannual variability and long-term declines in sea ice affect atmospheric contaminants in the Arctic?

北极地区具有独特的大气化学，对人类健康既有积极的影响，也有消极的影响，例如地面臭氧的耗竭和汞的沉积。大气中的二氧化碳吸收到海水中，受到时变海冰覆盖量的减缓，导致北冰洋水域酸化，对海洋生态系统有潜在的重要影响。人们预计大气及其化学将以一种复杂的方式对海冰变化和北极变暖作出反应，但由于对相关过程只有基本的机制理解，科学界缺乏自信地做出预测的能力。O-Buoy化学网络项目是由北极观测网络拨款资助的，目的是观察大气化学物质、气象学和海冰特性，这些特性可以提高我们对相关过程的理解，从而提高对未来气候情景的可预测性。该项目部署了15个自主浮标，测量三种哨兵大气化学物质，每个浮标大约持续一年。这将为了解北极大气提供详细的、高时间分辨率的数据。S化学与海冰的关系。在这个项目中，科学团队将综合、解释并从O-Buoy网络数据中产生基本的理解。此外，GEOS-Chem模型与O-Buoy测量相结合，将用于发展对北极大气和海冰之间关系的全区域理解。这个项目将在多个方面促进STEM人力发展。它将为早期职业科学家在其职业生涯的形成阶段提供支持。它将支持培养三名博士研究生，并招收多名本科生。通过利用达特茅斯学院女性科学项目（WISP）和阿拉斯加大学阿拉斯加本土科学与工程项目（ANSEP）的资源，将努力从STEM领域代表性不足的群体中吸引这些学生。通过现有的项目，如美国国家科学基金会资助的下一代天气模糊项目，美国陆军工程兵团寒冷地区研究和工程实验室为新罕布什尔州中学生举办的夏季科学营，阿拉斯加大学每年的春季科学杂花开放日，缅因州布斯湾港的每周一次的caf<s:1> Scientifique，将使K - gray社区的外展成为可能。一个促进公众参与前沿科学研究的夏季系列讲座，以及毕格罗海洋科学实验室的广泛网络存在。北冰洋上覆大气的特点是由海盐产生反应性卤素氧化剂，导致地面臭氧消耗和汞沉积。这种产量被认为是受到海冰覆盖状况的调节。该项目将通过统计分析和建模方法回答与“北冰洋环境，特别是海冰的变化如何影响大气？”这一首要问题相关的三个具体科学问题。统计方法将检验和改进对过程的理解，而建模方法将用于改进通过断裂、漂移、海冰与北冰洋气体交换通量的量化，并预测来自海冰的活性卤素氧化剂及其前体的通量。这些建模工作充分利用了覆盖北冰洋地区的o -浮标2009年至2016年的数据，这一时期的海冰变化很大，与历史平均水平相比，海冰减少了。构成本项目重点的三个具体问题是：Q1：在什么条件下，二氧化碳的空气-冰-海洋通量是北冰洋上空大气二氧化碳变率的重要原因，反之，在什么情况下，远程输送是重要的？Q2：北冰洋的海冰、雪和垂直混合条件如何影响大气中的主要氧化剂（臭氧和活性卤素）？问题3：年际变化和海冰的长期减少如何影响北极的大气污染物？

项目成果

Arctic Reactive Bromine Events Occur in Two Distinct Sets of Environmental Conditions: A Statistical Analysis of 6 Years of Observations

北极活性溴事件发生在两组不同的环境条件下：对 6 年观测的统计分析

• DOI: 10.1029/2019jd032139
• 发表时间: 2020
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: Swanson, William F.;Graham, Kelly A.;Halfacre, John W.;Holmes, Christopher D.;Shepson, Paul B.;Simpson, William R.
• 通讯作者: Simpson, William R.