Evaluation of modelled methane emissions over high-latitude wetlands

• DOI: 10.5194/egusphere-egu2020-12686
• Publication Date: 2020-03-09T23:44:00Z
• Authors: Yao Gao; Eleanor Burke; Sarah Chadburn; Maarit Raivonen; Timo Vesala; Mika Aurela; Annalea Lohila; Huiyi Yang; Tingting Li; Tuula Aalto
• Keywords: 13. Climate action; 14. Life underwater; 15. Life on land; 6. Clean water

<p>Atmospheric emissions and concentrations of CH<sub>4</sub> are continuing to increase, making the second most important human-influenced greenhouse gas in terms climate forcing, after CO<sub>2</sub>. Previous studies indicated that wetland emission is not only single largest but also uncertain natural source global budget. Furthermore, strong sensitivity environmental conditions has raised concerns on potential positive feedbacks change. Therefore, evaluation process-based land surface models earth system (ESMs) simulating over wetlands needed for more precise future predictions. In this work, a set high-latitude sites with various nutrient studied. The fluxes simulated by model JULES UK Earth System Helsinki peatland methane (HIMMELI), which developed at Finnish Meteorological Institute University. differences between modelled observed analyzed, complemented key variables interpretation (e.g. soil temperature moisture, vegetation types, snow depth, NPP, carbon). general, HIMMELI closer magnitude seasonality than those JULES. inter-annual variability depends anoxic respiration, serves as substrate HIMMELI. respiration calculated based water table depth More accurate simulation carbon pool will lead improvement respiration.</p>