Potential CO2 emissions from defrosting permafrost soils of the Qinghai-Tibet Plateau under different scenarios of climate change in 2050 and 2070

Permafrost soils store enormous quantities of organic carbon. Especially on the alpine Qinghai-Tibet Plateau, global warming induces strong permafrost thawing, which strengthens the microbial decomposition of organic carbon and the emission of the greenhouse gas carbon dioxide (CO2). Enhanced respir...

Full description

Bibliographic Details
Published in:CATENA
Main Authors: Bosch, Anna, Schmidt, Karsten, He, Jin-Sheng, Doerfer, Corina, Scholten, Thomas
Other Authors: Bosch, A (reprint author), Univ Tubingen, Dept Geosci Soil Sci & Geomorphol, Ruemelinstr 19-23, D-72070 Tubingen, Germany., Univ Tubingen, Dept Geosci, Chair Soil Sci & Geomorphol, Tubingen, Germany., Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810008, Peoples R China., Peking Univ, Key Lab Earth Surface Proc, Coll Urban & Environm Sci, Dept Ecol,Minist Educ, Beijing 100871, Peoples R China., Univ Tubingen, Dept Geosci Soil Sci & Geomorphol, Ruemelinstr 19-23, D-72070 Tubingen, Germany.
Format: Journal/Newspaper
Language:English
Published: CATENA 2017
Subjects:
Permafrost soil
Carbon
Carbon dioxide
Soil respiration
Qinghai-Tibet Plateau
Climate change scenarios
CARBON RELEASE
TERRESTRIAL ECOSYSTEMS
ORGANIC-CARBON
AUTOTROPHIC RESPIRATION
HIGH ASIA
TEMPERATURE
DEGRADATION
PRECIPITATION
GRASSLANDS
DYNAMICS
permafrost
Online Access:https://hdl.handle.net/20.500.11897/475544
https://doi.org/10.1016/j.catena.2016.08.035
Description
Summary:Permafrost soils store enormous quantities of organic carbon. Especially on the alpine Qinghai-Tibet Plateau, global warming induces strong permafrost thawing, which strengthens the microbial decomposition of organic carbon and the emission of the greenhouse gas carbon dioxide (CO2). Enhanced respiration rates may intensify climate warming in turn, but the magnitude of future CO2 emissions from this data-scarce region in a changing climate remains highly uncertain. Here, we aim at an area-wide estimation of future potential CO2 emissions for the permafrost region on the Qinghai-Tibet Plateau as key region for climate change studies due to its size and sensitiveness. We calculated four potential soil respiration scenarios for 2050 and 2070 each. Using a regression model, results from laboratory experiments and C stock estimations from other studies, we provide an approximation of total potential soil CO2 emissions on a regional scale ranging from 737.90 g CO2 m(-2) 4224.77 g CO2 m(-2) y(-1). Our calculations as first estimate of thawing-induced CO2 emissions (5123 g CO2 m(-2) y(-1)-3002.82 g CO2 m(2) y(-1)) from permafrost soils of the Qinghai-Tibet Plateau under global warming appear to be consistent to measurements of C loss from thawing permafrost soils measured within other studies. Thawing-induced soil CO2 emissions from permafrost soils with a organic C content ranging from 2.42 g degrees C kg(-1) to 425.23 g C kg(-1) increase general soil respiration by at least about one third on average at a temperature of 5 degrees C. Differences between scenarios remain <1% and thawing-induced CO2 emissions generally decrease over time comparing 2015, 2050 and 2070. With this spatial approximation at a regional scale, a first area-wide estimate of potential CO2 emissions for 2050 and 2070 from permafrost soils of the Qinghai-Tibet Plateau is provided. This offers support of assessing potential area-specific greenhouse gas emissions and more differentiated climate change models. (C) 2016 Elsevier B.V. All rights reserved. Evangelisches Studienwerk Villigst e.V.; German Federal Ministry for Education and Research (BMBF) [03G0810A] SCI(E) ARTICLE 221-231 149

Similar Items