Landfast Ice Seasonal Variability on St. Lawrence Island

Authors: David Jensen*, Virginia Tech, David Jensen, Virginia Tech, Lynn Resler, Virginia Tech
Topics: Physical Geography, Polar Regions, Remote Sensing
Keywords: : Cryosphere, Physical Geography, Landfast Ice, Cold Regions
Session Type: Poster
Day: 4/5/2019
Start / End Time: 1:10 PM / 2:50 PM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: No File Uploaded

Landfast ice – sea ice that seasonally freezes against coastlines mediates interactions between land, ocean, and atmospheric processes. Landfast ice influence on land, ocean, and atmospheric processes is most acute when landfast ice encircles those processes, such as islands situated in cold regions. On St. Lawrence Island in the Bering Sea, the spatial distribution and seasonal duration of landfast ice, and the processes on which they depend, is becoming increasingly variable. On this island, landfast ice is an important coastal feature for subsistence activities, coastal morphology, and wildlife habitat / migratory behavior. Understanding drivers of change in these associated processes requires a comprehensive analysis of how interacting landfast ice regimes are changing as well. This understanding is constrained by limited landfast ice research on Bering Sea Islands. This research represents the first comprehensive analysis of landfast ice on St. Lawrence Island using remote sensing and geospatial methods. Preliminary results suggest landfast ice distribution and seasonal duration on the island is becoming more spatially and temporally variable over interannual and decadal timescales. Preliminary results also reveal different landfast ice regimes by geographic region on the island, with greater areal extents and seasonal durations on the northern coast compared to the southern coast.

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