A regime shift from erosion to carbon accumulation in a temperate northern peatland

Abstract

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Widespread recent ecosystem state shifts in high‐latitude peatlands of northeastern Canada and implications for carbon sequestration

“…Although there are consistent patterns of changes among peat records that can be attributed to climate change, our synthesis also highlights differences in the timing of ecosystem shifts even within the same ecoclimatic regions (Figure 3). Peatlands typically show non-linear responses to climate change, and the timing of climatedriven ecosystem shifts can vary between and within sites (Milner et al, 2021;Sim et al, 2021;Zhang et al, 2018a, b) due to internal peatland dynamics and ecohydrological feedbacks (Morris et al, 2015;Swindles et al, 2012). Vegetation succession can take decades to occur in response to external climate forcing due to the resilience of peatland ecosystems (Harris et al, 2020;Hughes & Barber, 2004).…”

Duff burning from wildfires in a moist region: different impacts on PM<sub>2.5</sub> and Ozone

“…The model has coupled gas-phase atmospheric chemistry (Wang et al, 2015;, aerosol optical properties (Barnard et al, 2010), and the new Thompson graupel microphysics scheme (Thompson et al, 2008). The radiation scheme is the Rapid Radiative Transfer Method for Global Climate Models (GCMs) (RRTMG) (Iacono et al, 2008;Mlawer et al, 1997 Sandu et al, 2003;Sandu and Sander, 2006). The 1° x 1° meteorological data from National Centers for Environmental Prediction (NCEP) FNL (final) Operational Model Global Tropospheric Analyses (FNL NCEP, 2000) was used as the meteorological initial and boundary conditions for the simulations.…”

“…From the FINN emission dataset, 87% of the burned area in Oke11 was burned by Oke07, and 79% of Oke17 was burned by the 2007 and 2011 fires. We assumed a duff layer recovery rate of 1 mm/year based on previous studies (Ovenden, 1990;Frolking et al, 2001;Borren et al, 2004;Milner et al, 2020). Only a fraction of the measured burned duff depth for the Rough Ridge Fire (Zhao et al, 2019) was assumed for the reburned areas.…”

Reply on RC1

“…The model has coupled gas-phase atmospheric chemistry (Wang et al, 2015;, aerosol optical properties (Barnard et al, 2010), and the new Thompson graupel microphysics scheme (Thompson et al, 2008). The radiation scheme is the Rapid Radiative Transfer Method for Global Climate Models (GCMs) (RRTMG) (Iacono et al, 2008;Mlawer et al, 1997). The kinetic preprocessor (KPP) library was used for chemical reactions (Damian et Sandu et al, 2003;Sandu and Sander, 2006).…”

“…From the FINN emission dataset, 87% of the burned area in Oke11 was burned by Oke07, and 79% of Oke17 was burned by the 2007 and 2011 fires. We assumed a duff layer recovery rate of 1 mm/year based on previous studies (Ovenden, 1990;Frolking et al, 2001;Borren et al, 2004;Milner et al, 2020). Only a fraction of the measured burned duff depth for the Rough Ridge Fire (Zhao et al, 2019) was assumed for the reburned areas.…”