Preprints
https://doi.org/10.5194/bg-2022-220
https://doi.org/10.5194/bg-2022-220
 
09 Dec 2022
09 Dec 2022
Status: this preprint is currently under review for the journal BG.

Methane emissions from Arctic landscapes during 2000–2015: An analysis with land and lake biogeochemistry models

Xiangyu Liu1 and Qianlai Zhuang1,2,3 Xiangyu Liu and Qianlai Zhuang
  • 1Department of Earth, Atmospheric, Planetary Sciences, Purdue University, West Lafayette, IN, USA
  • 2Department of Agronomy, Purdue University, West Lafayette, IN, USA
  • 3Purdue Climate Change Research Center, West Lafayette, IN, USA

Abstract. Wetlands and freshwater bodies (mainly lakes) are the largest natural source of greenhouse gas CH4 to the atmosphere. Great efforts have been made to quantify these source emissions and their uncertainties. Previous research suggests that there might be significant uncertainties coming from “double accounting” emissions from freshwater bodies and wetlands. Here we quantify the methane emissions from both land and freshwater bodies in the pan-Arctic with two process-based biogeochemistry models by minimizing the double accounting at the landscape scale. Two non-overlapping dynamic areal change datasets are used to drive the models. We estimate that the total methane emissions from pan-Arctic are 35.81 Tg CH4 yr−1 during 2000–2015, of which wetlands and freshwater bodies are 21.38 CH4 Tg yr−1 and 14.45 Tg CH4 yr−1, respectively. The emissions are significantly affected by humidity and vapor pressure, followed by temperature and landscape areal changes. Emissions from wetlands are more sensitive to landscape areal changes than from freshwater bodies while the latter emissions are more influenced by temperature than precipitation. Our sensitivity analysis indicates the pan-Arctic CH4 emissions from freshwater bodies were highly influenced by temperature, but less by lake sediment carbon content from permafrost thaw.

Xiangyu Liu and Qianlai Zhuang

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2022-220', Anonymous Referee #1, 14 Dec 2022
  • RC2: 'Comment on bg-2022-220', Anonymous Referee #2, 27 Jan 2023

Xiangyu Liu and Qianlai Zhuang

Xiangyu Liu and Qianlai Zhuang

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Short summary
We are among the first to quantify methane emissions from wetlands and lakes in the pan-Arctic. The total CH4 emissions are 35.81 Tg CH4 yr⁻¹ during 2000–2015, of which wetlands and lakes were 21.38 Tg yr⁻¹ and 14.45 Tg yr⁻¹, respectively. By using 2 non-overlap area change datasets combined with land and lake models, our simulation avoids some small lakes being counted twice as both lake and wetland, and narrows the gap between two different methods that used to quantify regional CH4 emission.
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