Methane emissions in Arctic & boreal North America: Comparisons between flux models and atmospheric observations
Hanyu Liu, Johns Hopkins University, hliu154@jh.edu (Presenter)
Vineet Yadav, JPL, vineet.yadav@jpl.nasa.gov
Deborah Nicole Huntzinger, Northern Arizona University, deborah.huntzinger@nau.edu
Rachel Chang, Department of Physics & Atmospheric Science, Dalhousie University, Halifaz, Nova Scotia, rachel.chang@dal.ca
Charles Miller, NASA JPL, charles.e.miller@jpl.nasa.gov
Colm Sweeney, NOAA GML, colm.sweeney@noaa.gov
Scot Michael Miller, Johns Hopkins University, smill191@jhu.edu
Wetlands in high-latitude North America is a significant natural source of atmospheric methane (CH4) emissions. As the second most long-lived greenhouse gas on earth, methane emissions amplify climate change effects, and rising temperatures in high-latitude wetlands may be increasing methane emissions due to the thawing of permafrost and the expansion of wetland areas. Bottom-up models of methane fluxes exhibit large uncertainties in boreal and arctic ecosystems; these models likely underestimate methane fluxes from Arctic tundra and overestimate of methane fluxes from the boreal zone in North America. The aim of the study is to quantify over a decade of methane fluxes in high-latitude North America using multiple sets of atmospheric methane observations, such as data from recent NASA aircraft campaigns as well as observations from regular tower and aircraft sites across the northern US and Canada. To compare the bottom-up methane estimates with existing tower and aircraft data products, we use a geostatistical inverse model (GIM) to estimate methane emissions across these high-latitude North America regions from years 2010 through 2022.
Associated Project(s):
Poster Location ID: 14
Presentation Type: Poster
Session: Permafrost and Hydrology
Session Date: Wednesday (5/22) 5:00 PM