Articles | Volume 13, issue 20
Biogeosciences, 13, 5849–5863, 2016
Biogeosciences, 13, 5849–5863, 2016

Research article 26 Oct 2016

Research article | 26 Oct 2016

The importance of freshwater systems to the net atmospheric exchange of carbon dioxide and methane with a rapidly changing high Arctic watershed

Craig A. Emmerton1, Vincent L. St. Louis1, Igor Lehnherr2, Jennifer A. Graydon1, Jane L. Kirk3, and Kimberly J. Rondeau1 Craig A. Emmerton et al.
  • 1Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
  • 2Department Geography, University of Toronto-Mississauga, Mississauga, Ontario L5L 1C6, Canada
  • 3Science & Technology Branch, Environment and Climate Change Canada, Burlington, Ontario L7R 4A6, Canada

Abstract. A warming climate is rapidly changing the distribution and exchanges of carbon within high Arctic ecosystems. Few data exist, however, which quantify exchange of both carbon dioxide (CO2) and methane (CH4) between the atmosphere and freshwater systems, or estimate freshwater contributions to total catchment exchange of these gases, in the high Arctic. During the summers of 2005 and 2007–2012, we quantified CO2 and CH4 concentrations in, and atmospheric exchange with, common freshwater systems in the high Arctic watershed of Lake Hazen, Nunavut, Canada. We identified four types of biogeochemically distinct freshwater systems in the watershed; however mean CO2 concentrations (21–28 µmol L−1) and atmospheric exchange (−0.013 to +0.046 g C–CO2 m−2 day−1) were similar between these systems. Seasonal flooding of ponds bordering Lake Hazen generated considerable CH4 emissions to the atmosphere (+0.008 g C–CH4 m−2 day−1), while all other freshwater systems were minimal emitters of this gas (< +0.001 g C–CH4 m−2 day−1). When using ecosystem-cover classification mapping and data from previous studies, we found that freshwaters were unimportant contributors to total watershed carbon exchange, in part because they covered less than 10 % of total area in the watershed. High Arctic watersheds are experiencing warmer and wetter climates than in the past, which may have implications for moisture availability, landscape cover, and the exchange of CO2 and CH4 of underproductive but expansive polar semidesert ecosystems.

Short summary
It is unknown if lakes are important contributors to the total transfer of greenhouse gases between high Arctic regions and the atmosphere. We measured the transfer of carbon greenhouse gases between lakes and the atmosphere and compared results with adjacent landscapes. We found lakes were weak emitters of the gases to the atmosphere, compared to contributions of terrestrial ecosystems, and will likely continue to be inconsequential to regional carbon cycling in a warmer future climate.
Final-revised paper