CAREER: Air-sea Exchange of Volatile Organic Compounds--Impacts on Climate and Atmospheric Chemistry

职业：挥发性有机化合物的海气交换——对气候和大气化学的影响

• 批准号: 1550177
• 负责人: Timothy Bertram
• 金额: $ 25.73万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1550177&HistoricalAwards=false
• 关键词: CAREER; Air; sea; Exchange; Volatile

Biogenic volatile organic compounds (BVOC), emitted from photosynthetic organisms, play a controlling role in both regulating oxidant loadings and setting the production rate of secondary organic aerosol (SOA) in both terrestrial and marine environments. To date, the vast majority of research has focused on terrestrial sources of BVOC, with specific attention to the factors that control the emission rates of isoprene, monoterpenes, and sesquiterpenes. In comparison, considerably less is known about marine BVOC emissions. Similar to terrestrial processes, the spatio-temporal distribution of marine BVOC emissions is thought to be highly variable, depending on the number concentration and species of photosynthetic organism. It has been suggested that marine BVOC emissions in highly productive regions of the oceans: 1) impact oxidant loadings in the marine boundary layer (MBL), 2) contribute to SOA production, and 3) alter particle size and microphysical properties, thus impacting cloud formation and persistence in the MBL. At present, there exists an extreme paucity of experimental data of BVOC fluxes to constrain global models of ocean BVOC emissions and their subsequent impact on climate and atmospheric chemistry. This multi-scale investigation is designed to link detailed laboratory investigations of isoprene and total monoterpene production from isolated monocultures of an array of relevant marine organisms with direct measurements of isoprene and total monoterpene emissions made via eddy correlation during coastal algae blooms from the Scripps Institution of Oceanography (SIO) pier and during a research cruise in a region of high biological activity and high wind speeds.The educational component of the effort involves coupling with the Birch Aquarium, the educational outreach center of SIO, and their Summer Learning Adventure Camp programs to: 1) Develop a hands-on experiment, for students in 7-9th grade, to investigate the uptake of carbon dioxide by the ocean and its impact on ocean acidity. The lesson will discuss fundamental scientific concepts (e.g., solubility, acid-base chemistry), while investigating how the atmosphere and oceans are linked. Further, the experiment will be designed with the intent of teaching students the scientific process in which hypotheses are designed and tested. 2) Connect graduate students, who have designed miniature carbon dioxide sensors as part of an existing analytical chemistry graduate class, with 7-9th grade students who will then use these sensors in their hands-on experiment. 3) Engage 7-9th grade students as they discover active research alongside graduate student guides and participate in hands-on experiments. Students will make observations, collect data, and learn about a variety of scientific instruments and their applications.

光合作用生物释放的生物源挥发性有机化合物(BVOC)在调节陆地和海洋环境中的氧化剂负荷和调节二次有机气溶胶(SOA)的产生速率方面起着控制作用。到目前为止，绝大多数研究都集中在BVOC的陆地来源上，特别关注控制异戊二烯、单萜和倍半萜排放速率的因素。相比之下，人们对海洋BVOC排放的了解要少得多。与陆地过程类似，海洋BVOC排放的时空分布被认为是高度可变的，取决于光合作用有机体的数量、浓度和物种。有人认为，海洋高生产力区域的海洋BVOC排放：1)影响海洋边界层(MBL)中的氧化剂负荷，2)促进SOA的产生，3)改变颗粒大小和微物理性质，从而影响MBL中的云形成和持久性。目前，有关全球海洋BVOC排放及其对气候和大气化学影响的模型缺乏BVOC通量的实验数据。这项多尺度的调查旨在将对一系列相关海洋生物的孤立单一养殖的异戊二烯和总单萜的详细实验室调查与在斯克里普斯海洋研究所(SIO)码头沿海藻类水华期间和在高生物活动和高风速地区的研究巡航期间通过涡流相关直接测量异戊二烯和总单萜排放量相联系。这项工作的教育部分包括与桦树水族馆、SIO教育推广中心和他们的夏季冒险夏令营计划相结合，以：1)为7-9年级的学生开发一个动手实验，调查海洋对二氧化碳的吸收及其对海洋酸度的影响。本课程将讨论基本的科学概念(例如，溶解度、酸碱化学)，同时研究大气和海洋是如何联系在一起的。此外，本实验的设计意图是教授学生设计和检验假设的科学过程。2)将设计微型二氧化碳传感器作为现有分析化学研究生班的一部分的研究生与7-9年级的学生联系起来，然后他们将在动手实验中使用这些传感器。3)让7-9年级的学生与研究生指导一起发现活跃的研究，并参与动手实验。学生将进行观察，收集数据，并学习各种科学仪器及其应用。