A. Britta K. Sannel
A5077504737- Climate change and permafrost
- Peatlands and Wetlands Ecology
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Coastal wetland ecosystem dynamics
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Land Use and Ecosystem Services
- Fire effects on ecosystems
- Karst Systems and Hydrogeology
- Geological Studies and Exploration
- Geological formations and processes
- Isotope Analysis in Ecology
- Landslides and related hazards
- Hydrology and Watershed Management Studies
- Archaeology and ancient environmental studies
- Interdisciplinary Research and Collaboration
- Pleistocene-Era Hominins and Archaeology
- Atmospheric chemistry and aerosols
- Soil and Unsaturated Flow
- Marine and environmental studies
- Botany and Plant Ecology Studies
- Water Resources and Management
- Coastal and Marine Management
- Hungarian Social, Economic and Educational Studies
Bolin Centre for Climate Research
2016-2024
Stockholm University
2015-2024
University of Leeds
2023
Permafrost warming has the potential to amplify global climate change, because when frozen sediments thaw it unlocks soil organic carbon. Yet date, no globally consistent assessment of permafrost temperature change been compiled. Here we use a data set time series from Global Terrestrial Network for evaluate across regions period since International Polar Year (2007-2009). During reference decade between 2007 and 2016, ground near depth zero annual amplitude in continuous zone increased by...
Here, we present results from the most comprehensive compilation of Holocene peat soil properties with associated carbon and nitrogen accumulation rates for northern peatlands. Our database consists 268 cores 215 sites located north 45°N. It encompasses regions within which data have only recently become available, such as West Siberia Lowlands, Hudson Bay Kamchatka in Far East Russia, Tibetan Plateau. For all peatlands, content organic matter was estimated at 42 ± 3% (standard deviation)...
Abstract Thermokarst is the process whereby thawing of ice-rich permafrost ground causes land subsidence, resulting in development distinctive landforms. Accelerated thermokarst due to climate change will damage infrastructure, but also impact hydrology, ecology and biogeochemistry. Here, we present a circumpolar assessment distribution landscapes, defined as landscapes comprised current landforms areas susceptible future development. At 3.6 × 10 6 km 2 , are estimated cover ∼20% northern...
Abstract This paper provides a snapshot of the permafrost thermal state in Nordic area obtained during International Polar Year (IPY) 2007–2009. Several intensive research campaigns were undertaken within variety projects countries to obtain this snapshot. We demonstrate for Scandinavia that both lowland palsas and peat plateaus, large areas mountains are at temperatures close 0°C, which makes them sensitive climatic changes. In Svalbard northeast Greenland, also highest parts rest area, is...
Approximately 1700 Pg of soil carbon (C) are stored in the northern circumpolar permafrost zone, more than twice as much C atmosphere. The overall amount, rate, and form released to atmosphere a warmer world will influence strength feedback climate change. We used survey quantify variability perception vulnerability Experts were asked provide quantitative estimates change response four scenarios warming. For highest warming scenario (RCP 8.5), experts hypothesized that release from zone...
Peat plateaus are widespread at high northern latitudes and important soil organic carbon reservoirs. A warming climate can cause either increased ground subsidence (thermokarst) resulting in l ...
Glacial−interglacial variations in CO 2 and methane polar ice cores have been attributed, part, to changes global wetland extent, but the distribution before Last Glacial Maximum (LGM, 21 ka 18 ka) remains virtually unknown. We present a study of peatland extent carbon (C) stocks through last glacial cycle (130 present) using newly compiled database 1,063 detailed stratigraphic records peat deposits buried by mineral sediments, as well model. Quantitative agreement between modeling...
A research-based understanding of permafrost distribution at a sufficient spatial resolution is important to meet the demands science, education and society. We present new map for Norway, Sweden Finland that provides more detailed updated description in this area than previously available. implemented CryoGRID1 model 1 km2 resolution, forced by operationally gridded data-set daily air temperature snow cover Finland, Norway Sweden. Hundred realisations were run each grid cell, based on...
Abstract Modeling and observation of ground temperature dynamics are the main tools for understanding current permafrost thermal regimes projecting future thaw. Until recently, most studies on have focused vertical heat fluxes. Groundwater can transport in both lateral directions but its influence temperatures at local scales environments is not well understood. In this study we combine field observations from a subarctic fen sporadic zone with numerical simulations coupled water At...
Abstract Permafrost dynamics play an important role in high‐latitude peatland carbon balance and are key to understanding the future response of soil stocks. aggradation can control magnitude feedback peatlands through effects on peat properties. We compiled plant macrofossil records for northern permafrost zone (515 cores from 280 sites) classified samples by vegetation type environmental class (fen, bog, tundra boreal permafrost, thawed permafrost). examined differences properties (bulk...
Wetlands are often vital physical and social components of a country’s natural capital, as well providers ecosystem services to local national communities. We performed network analysis prioritize Sustainable Development Goal (SDG) targets for sustainable development in iconic wetlands wetlandscapes around the world. The was based on information perceptions 45 worldwide by 49 wetland researchers Global Wetland Ecohydrological Network (GWEN). identified three 2030 Agenda high priority across...
The majority of northern peatlands were initiated during the Holocene. Owing to their mass imbalance, they have sequestered huge amounts carbon in terrestrial ecosystems. Although recent syntheses filled some knowledge gaps, extent and remoteness many pose challenges developing reliable regional accumulation estimates from observations. In this work, we employed an individual- patch-based dynamic global vegetation model (LPJ-GUESS) with peatland permafrost functionality quantify long-term...
Abstract Soils are warming as air temperatures rise across the Arctic and Boreal region concurrent with expansion of tall-statured shrubs trees in tundra. Changes vegetation structure function expected to alter soil thermal regimes, thereby modifying climate feedbacks related permafrost thaw carbon cycling. However, current understanding impacts on temperature is limited local or regional scales lacks generality necessary predict stability a pan-Arctic scale. Here we synthesize shallow...
Northern peatlands store 300–600 Pg C, of which approximately half are underlain by permafrost. Climate warming and, in some regions, soil drying from enhanced evaporation progressively threatening this large carbon stock. Here, we assess future CO2 and CH4 fluxes northern using five land surface models that explicitly include representation peatland processes. Under Representative Concentration Pathways (RCP) 2.6, projected to remain a net sink climate neutral for the next three centuries....
Abstract. Ponds and lakes are abundant in Arctic permafrost lowlands. They play an important role wetland ecosystems by regulating carbon, water, energy fluxes providing freshwater habitats. However, ponds, i.e., waterbodies with surface areas smaller than 1. 0 × 104 m2, have not been inventoried on global regional scales. The Permafrost Region Pond Lake (PeRL) database presents the results of a circum-Arctic effort to map ponds from modern (2002–2013) high-resolution aerial satellite...
Northern peatlands store globally-important amounts of carbon in the form partly decomposed plant detritus. Drying associated with climate and land-use change may lead to increased fire frequency severity rapid loss atmosphere. However, our understanding patterns drivers peatland burning on an appropriate decadal millennial timescale relies heavily individual site-based reconstructions. For first time, we synthesise macrocharcoal records from across North America, Europe, Patagonia reveal...
Abstract Because climate change can affect the carbon balance and hydrology in permafrost peatlands, a better understanding of their sensitivity to changes temperature precipitation is needed. In Tavvavuoma, northernmost Sweden, meteorological parameters ground thermal properties have been monitored peat plateau from 2006 2013. During this time period, air record shows no warming trend, late‐season thaw depth has relatively stable at around 55–60 cm. Meanwhile, mean annual 1 m increased by...
Peat and net carbon accumulation rates in two sub‐arctic peat plateaus of west‐central Canada have been studied through geochemical analyses accelerator mass spectrometry (AMS) radiocarbon dating. The peatland sites started to develop around 6600–5900 cal. yr BP the plateau stages are characterized by Sphagnum fuscum alternating with rootlet layers. long‐term for both profiles 0.30–0.31 mm/yr 12.5–12.7 gC/m 2 yr, respectively. These values reflect very slow (0.04–0.09 mm/yr) (3.7–5.2 yr) top...
Subarctic permafrost peatlands are important soil organic carbon pools, and improved knowledge about peat properties peatland sensitivity to past climate change is essential when predicting future response a warmer associated feedback mechanisms. In this study, Holocene development dynamics of four subarctic plateaus in Finnmark, northern Norway have been investigated through detailed analyses plant macrofossils geochemical properties. Peatland inception occurred around 9800 cal. yr BP 9200...
Abstract Subarctic permafrost peatlands cover extensive areas and store large amounts of soil organic carbon that can be remobilized as active layer deepening thermokarst formation increase in a future warmer climate. Better knowledge ground thermal variability within these ecosystems is important for understanding landscape development feedbacks. In peat plateau complex Tavvavuoma, northern Sweden, temperatures snow depth have been monitored six different units: on plateau, depression along...
Abstract Volatile organic compounds (VOCs) play an essential role in climate change and air pollution by modulating tropospheric oxidation capacity providing precursors for ozone aerosol formation. Arctic permafrost buries large quantities of frozen soil carbon, which could be released as VOCs with thawing or collapsing a consequence global warming. However, due to the lack reported studies this field limited capability conventional measurement techniques, it is poorly understood how much...