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Sources and Impacts of Atmospheric Nitrogen Deposition

Dec 13, 10am (Tuesday)  Sources and Impacts of Atmospheric Nitrogen Deposition

Part 1: Changes in nitrogen deposition over time

Sarah Anderson will introduce the environmental challenges associated with excess nitrogen in the environment due to fossil fuel combustion and industrialized agriculture. Sarah will discuss what lichen sampling can tell us about nitrogen deposition from industrial and agricultural sources over time.

Learning Objectives:

  1. Understand environmental impacts from excess nitrogen
  2. Understand how amounts of nitrogen deposition from different sources have changed over time
  3. Understand the potential for negative impacts of changes in nitrogen deposition 

Part 2: Impacts of nitrogen deposition in subalpine ecosystems

Justin Poinsatte will describe his field research in subalpine vegetation communities and snow fields of the Northwest, looking at vegetation community responses to increased rates of N deposition. Justin will explain how the RHESSys Ecosystem Model adds to our understanding of how climate change will alter N dynamics in subalpine environments.

Learning Objectives:

  1. Learn about sources of atmospheric nitrogen deposition to subalpine ecosystems and processing of this nitrogen in snowpack
  2. Understand the impacts of nitrogen deposition on soil biogeochemistry in subalpine vegetation communities
  3. Understand how climate change affects subalpine ecosystem response to nitrogen deposition

sarah-anderson-smallestSarah Anderson is a PhD Candidate in the School of Biological Sciences at WSU in Pullman. She is currently finishing her dissertation focused on studying sources of atmospheric nitrogen pollution and how these sources of pollution change over time. Sarah is interested in how science is used in policy and decision-making settings. She is looking forward to learning more about science and policy while serving as a 2017 John A Knauss Legislative Fellow in Washington, DC.


justin-poinsatte-smallJustin Poinsatte is a PhD Candidate in the School of Biological Sciences at Washington State University. He is interested in biogeochemical cycling and ecosystem ecology, with a focus on human impacts to the carbon and nitrogen cycles. His doctoral research uses ecological modeling and experimental field studies to understand how atmospheric nitrogen deposition and climate change affect nutrient cycling in high-elevation ecosystems. Additionally, he is interested in how environmental monitoring informs public policy and enjoys participating in educational and scientific outreach.