Arctic Field Projects

Project Title: Collaborative Research: Responses of atmospheric oxidants and CO2 to dramatic changes in Arctic sea ice (Award# 1602781)

PI: Perovich, Donald K. (
Phone: (603) 643.8642 
Institute/Department: Dartmouth College, Thayer School of Engineering 
IPY Project?
Funding Agency: US\Federal\NSF\GEO\OPP\ARC\ANS
Program Manager: Dr. William Wiseman (
Discipline(s): | Meteorology and Climate | Oceanography |

Project Web Site(s):

Science Summary:
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?

Logistics Summary:
This is a collaborative project beginning in late summer 2016, between Simpson (Lead, 1602716, UAF), Perovich (1602781, Dartmouth), Matrai (1603172, Bigelow Laboratory for Ocean Science), Holmes (1602883, FSU) and Chavez (1602946, Monterey Bay Aquarium Research Institute). This project addresses the analysis, synthesis and interpretation of data essential to significantly improve our understanding of the role of carbon dioxide, ozone, and reactive halogens species (BrO) in the unique Arctic atmosphere. The results will answer fundamental questions about the influence of sea ice on the atmosphere and contribute to greatly improved predictions of future changes projected over the next 30 years in the Arctic. Data for this project was collected from the O-Buoy Chemical Network deployed in the Arctic as a component of the Arctic Observing Network (AON) from 2009 to the present. 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. There is no fieldwork associated with this project.

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