Search for: All records

Abstract Accelerated warming of the Arctic can affect the global climate system by thawing permafrost and exposing organic carbon in soils to decompose and release greenhouse gases into the atmosphere. We used a process-based biosphere model (DVM-DOS-TEM) designed to simulate biophysical and biogeochemical interactions between the soil, vegetation, and atmosphere. We varied soil and environmental parameters to assess the impact on cryohydrological and biogeochemical outputs in the model. We analyzed the responses of ecosystem carbon balances to permafrost thaw by running site-level simulations at two long-term tundra ecological monitoring sites in Alaska: Eight Mile Lake (EML) and Imnavait Creek Watershed (IMN), which are characterized by similar tussock tundra vegetation but differing soil drainage conditions and climate. Model outputs showed agreement with field observations at both sites for soil physical properties and ecosystem CO₂fluxes. Model simulations of Net Ecosystem Exchange (NEE) showed an overestimation during the frozen season (higher CO₂emissions) at EML with a mean NEE of 26.98 ± 4.83 gC/m²/month compared to observational mean of 22.01 ± 5.67 gC/m²/month, and during the fall months at IMN, with a modeled mean of 19.21 ± 7.49 gC/m²/month compared to observation mean of 11.9 ± 4.45 gC/m²/month. Our results underscore the importance of representing the impact of soil drainage conditions on the thawing of permafrost soils, particularly poorly drained soils, which will drive the magnitude of carbon released at sites across the high-latitude tundra. These findings can help improve predictions of net carbon releases from thawing permafrost, ultimately contributing to a better understanding of the impact of Arctic warming on the global climate system. 

Participatory planning is one strategy to increase tourism suppliers’ capacity to jointly anticipate climate change impacts and implement locally feasible and acceptable solutions; however, participatory planning is uncommon. In this study, we co-created a series of planning workshops with tourism partners to examine and address climate change impacts (challenges and opportunities) on Mount Desert Island, Maine, USA. We co-designed and facilitated two Zoom workshops in spring 2021 for tourism suppliers. Workshops focused on (1) identifying climate change impacts to the tourism system and (2) developing planning priorities for the destination. Workshops resulted in two planning priorities: visitation shifts and the opportunity to become a more sustainable destination in response to climate change. Our participatory approach brought together diverse tourism suppliers that do not usually collaborate to increase the destination’s capacity to plan for and respond to climate change. Similar participatory approaches may benefit other natural resource dependent contexts.