CO2 and CH4 emissions from streams in a lake-rich landscape

Patterns, controls, and regional significance

John T. Crawford, Noah R. Lottig, Emily H. Stanley, John F. Walker, Paul C. Hanson, Jacques C. Finlay, Robert G. Striegl

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Aquatic ecosystems are important components of landscape carbon budgets. In lake-rich landscapes, both lakes and streams may be important sources of carbon gases (CO2 and CH4) to the atmosphere, but the processes that control gas concentrations and emissions in these interconnected landscapes have not been adequately addressed. We use multiple data sets that vary in their spatial and temporal extent during 2001-2012 to investigate the carbon gas source strength of streams in a lake-rich landscape and to determine the contribution of lakes, metabolism, and groundwater to stream CO2 and CH4. We show that streams emit roughly the same mass of CO 2 (23.4 Gg C yr-1; 0.49 mol CO2 m-2 d-1) as lakes at a regional scale (27 Gg C yr-1) and that stream CH4 emissions (189 Mg C yr-1; 8.46 mmol CH 4 m-2 d-1) are an important component of the regional greenhouse gas balance. Gas transfer velocity variability (range = 0.34 to 13.5 m d-1) contributed to the variability of gas flux in this landscape. Groundwater inputs and in-stream metabolism control stream gas supersaturation at the landscape scale, while carbon cycling in lakes and deep groundwaters does not control downstream gas emissions. Our results indicate the need to consider connectivity of all aquatic ecosystems (lakes, streams, wetlands, and groundwater) in lake-rich landscapes and their connections with the terrestrial environment in order to understand the full nature of the carbon cycle.

Original languageEnglish (US)
Pages (from-to)197-210
Number of pages14
JournalGlobal Biogeochemical Cycles
Volume28
Issue number3
DOIs
StatePublished - Jan 1 2014

Fingerprint

Lakes
Gases
lake
Carbon
Groundwater
gas
Aquatic ecosystems
groundwater
Metabolism
aquatic ecosystem
carbon
metabolism
multiple use
Supersaturation
terrestrial environment
carbon budget
Wetlands
supersaturation
Carbon Monoxide
Gas emissions

Keywords

  • carbon dioxide
  • groundwater
  • metabolism
  • methane
  • streams
  • upscaling

Cite this

CO2 and CH4 emissions from streams in a lake-rich landscape : Patterns, controls, and regional significance. / Crawford, John T.; Lottig, Noah R.; Stanley, Emily H.; Walker, John F.; Hanson, Paul C.; Finlay, Jacques C.; Striegl, Robert G.

In: Global Biogeochemical Cycles, Vol. 28, No. 3, 01.01.2014, p. 197-210.

Research output: Contribution to journalArticle

Crawford, John T. ; Lottig, Noah R. ; Stanley, Emily H. ; Walker, John F. ; Hanson, Paul C. ; Finlay, Jacques C. ; Striegl, Robert G. / CO2 and CH4 emissions from streams in a lake-rich landscape : Patterns, controls, and regional significance. In: Global Biogeochemical Cycles. 2014 ; Vol. 28, No. 3. pp. 197-210.
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