Tuesday, June 12, 2018 at 10:00 AM AKDT
Rick Thoman and Aaron Jacobs, National Weather Service
Southeast Alaska is part of the the largest temperate rainforest in the world and is dependent on copious amount of precipitation. Like other ecosystems, significantly below normal precipitation effects the entire hydrologic cycle. The impacts of a rainforest drought range from hydro-electric power generation and community water supply to fish migration. This talk will go through the causes, specific impacts and how difficult it is to predict the onset and relief from drought conditions in an rainforest.
Tuesday, May 1, 2018 at 10:00 AM AKDT
Steven F. Daly PE, PhD, D.WRE ERDC/CRREL USACE
Breakup transforms an ice-covered river into an open river. Two ideal forms of breakup bracket the types of breakup that commonly occur. At one extreme is thermal breakup. During an ideal thermal breakup, the river ice cover deteriorates and melts in place, with no increase in flow and little or no ice movement. At the other extreme is the more complex and less understood mechanical breakup, which is the focus of this presentation. The main driver of mechanical breakup is the flow discharge hydrograph. The increase in flow induces stresses in the cover, and the stresses in turn cause cracks and the ultimate fragmentation of the ice cover into pieces that are carried by the channel flow. Ice jams take place at locations where the ice fragments stop; severe and sudden hydraulic transients can result when these ice jams form or when they release. This presentation will focus on mechanical breakup and the historical evolution of our understanding of this topic. The presentation will include discussions of ice cover formation and the typical resulting ice structure, wave-ice interaction, the physics of the cracking, and the current status of our understanding of breakup.
Wednesday, April 11, 2018 at 10:00 AM AKDT
Carolina Behe, Inuit Circumpolar Council Alaska; Julie Raymond-Yakoubian, Kawerak, Inc.; Raychelle Daniel, The Pew Charitable Trust
The Arctic is changing at an accelerated rate due to climate change and increased anthropogenic activity. Given the rate of change, never has it been more important to work toward a holistic understanding of the Arctic’s interconnecting systems. A co-production of knowledge framework will provide the holistic view and comprehension needed to inform effective and adaptive policies and practices. We underscore the role and value of different knowledge systems with different methodologies and the need for collaborative approaches in identifying research questions. We will present the most important components that form a co-production of knowledge framework.
Tuesday, April 3, 2018 at 10:00 AM AKDT
Molly McCammon, Director, Alaska Ocean Observing System
Join Molly McCammon, Executive Director of the Alaska Ocean Observing System (AOOS), as she describes the latest partnerships, ocean observing projects and data products and applications produced by AOOS, the Alaska regional component of the national Integrated Ocean Observing System. Begun in 2004, AOOS is now one of the leaders in Alaska facilitating ocean observations, piloting new technologies and making the use of ocean data easier for navigation safety, emergency response, and ecosystem management.
Tuesday, March 27, 2018 at 10:00 AM AKDT
Bill Schnabel, University of Alaska Fairbanks
Communities in Alaska’s Arctic and Subarctic regions are at risk from environmental threats including flooding, erosion, and thawing permafrost. However, the character and relative magnitude of those risks can vary from community to community, and it is not always clear which environmental threats pose the greatest amount of risk. This presentation describes an ongoing project being conducted by the University of Alaska Fairbanks, the USACE Cold Regions Research and Engineering Laboratory, and the US Army Corps of Engineers Alaska District. The project is sponsored by the Denali Commission. The purpose of the project is to use existing data to better characterize the threats to Alaska’s communities associated with flooding, erosion, and permafrost thaw, and develop a system by which stakeholders can evaluate the combined threat. The presentation will focus primarily upon consideration of the threats imposed by permafrost thaw, as that is the main focus of the UAF/CRREL component of the project.