A5056355251- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Peatlands and Wetlands Ecology
- Marine and coastal ecosystems
- Hydrocarbon exploration and reservoir analysis
- Aquatic and Environmental Studies
- Marine and environmental studies
- Geological Studies and Exploration
- Microbial Community Ecology and Physiology
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Aquatic Ecosystems and Phytoplankton Dynamics
- Botany and Plant Ecology Studies
- Ecology and biodiversity studies
- Fire effects on ecosystems
- Soil and Water Nutrient Dynamics
- Coastal wetland ecosystem dynamics
- Atmospheric chemistry and aerosols
- Arctic and Antarctic ice dynamics
- Polar Research and Ecology
- Isotope Analysis in Ecology
- Biocrusts and Microbial Ecology
- Forest Management and Policy
- Diatoms and Algae Research
Universidad de Magallanes
2017-2024
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2016-2024
University of Konstanz
2024
Center for Climate and Resilience Research
2018-2023
University of Chile
2018-2023
Universidad de La Frontera
2021
University of Alaska Fairbanks
2014-2019
Center for Research and Advanced Studies of the National Polytechnic Institute
2012-2018
Instituto Politécnico Nacional
2012-2018
Abstract. Uncertainties in the magnitude and seasonality of various gas emission modes, particularly among different lake types, limit our ability to estimate methane (CH4) carbon dioxide (CO2) emissions from northern lakes. Here we assessed relationship between CH4 CO2 modes 40 lakes along a latitudinal transect Alaska lakes' physicochemical properties geographic characteristics, including permafrost soil type surrounding Emission included direct ebullition, diffusion, storage flux, newly...
Arctic lakes emit methane (CH4) to the atmosphere. The magnitude of this flux could increase with permafrost thaw but might also be mitigated by microbial CH4 oxidation. Methane oxidation in oxic water has been extensively studied, while contribution anaerobic (AOM) mitigation is not fully understood. We have investigated four Northern Siberian stratified an area discontinuous nearby Igarka, Russia. Analyses concentrations column demonstrated that 60 100% upward diffusing was oxidized anoxic...
Abstract. Methanotrophic bacteria play an important role oxidizing a significant fraction of methane (CH4) produced in lakes. Aerobic CH4 oxidation depends mainly on lake and oxygen (O2) concentrations, such manner that higher MO rates are usually found at the oxic/anoxic interface, where both molecules present. also temperature, via methanogenesis, organic carbon input to lakes, including from thawing permafrost thermokarst (thaw)-affected Given large variability these environmental...
Abstract. Microbial methane (CH4) ebullition (bubbling) from anoxic lake sediments comprises a globally significant flux to the atmosphere, but bubbles in temperate and polar lakes can be trapped by winter ice cover later released during spring thaw. This "ice-bubble storage" (IBS) constitutes novel mode of CH4 emission. Before are encapsulated downward-growing ice, some their dissolves into water, where it may subject oxidation. We present field characterization model annual cycle...
A novel low-cost method for the combined, real-time, and in situ determination of dissolved methane carbon dioxide concentrations freshwater ecosystems was designed developed. This is based on continuous sampling water from a ecosystem to gas/liquid exchange membrane. Dissolved gas transferred through membrane flow high purity nitrogen, which then measured by an off-axis integrated cavity output spectrometer (OA-ICOS). method, called M-ICOS, carefully tested laboratory subsequently applied...
Abstract Peatland open‐water pools can be net carbon (C) emitters within heterogeneous peatland ecosystems that are generally C sinks. However, the intra‐ and inter‐regional patterns drivers of CO 2 CH 4 production, as well their link with dissolved organic matter (DOM) quality quantity, remain poorly understood. We analyzed a range optical characteristics chemical variables controlling DOM concentrations in across two regions contrasting geographical properties (i.e., climate, topography,...
Abstract. Thermokarst (thaw) lakes emit methane (CH4) to the atmosphere formed from thawed permafrost organic matter (OM), but relative magnitude of CH4 production in surface lake sediments vs. deeper horizons is not well understood. We assessed anaerobic potentials various depths along a 590 cm long sediment core that captured entire package talik (thaw bulb) beneath center an interior Alaska thermokarst lake, Vault Lake, and top 40 thawing talik. also studied adjacent Creek tunnel extends...
Abstract Small lentic freshwater ecosystems play a disproportionate role in global biogeochemical cycles by processing large amounts of carbon (C), nitrogen (N), and phosphorus (P), but it is unlikely that they behave as one homogenous group for the purpose extrapolation. Here, we synthesize data from >12,000 geographically distinct systems: lakes, peatland ponds, thermokarst waterbodies. We show ponds are biogeochemically more widely studied lake systems, while waterbodies share...
Lakes are significant sources of the greenhouse gas methane (CH₄) to atmosphere, with littoral zones recognized as hotspots for CH₄ emissions. However, specific pathways driving enrichment in lakes remain poorly understood, contributing uncertainties global lake budgets. To address this gap, our study investigates role sediments main source dissolved and drivers behind high yet variable concentrations water column along different seasons. We specifically focus on impact...
Microbial decomposition of thawed permafrost carbon in thermokarst lakes leads to the release ancient as greenhouse gas methane (CH4), yet potential mitigating processes are not understood. Here, we report δ13C–CH4 signatures pore water a lake sediment core that points towards situ occurrence anaerobic oxidation (AOM). Analysis microbial communities showed natural enrichment CH4-oxidizing archaeal occur horizons at temperatures near 0 °C. These archaea also high rates AOM laboratory...
Freshwater ecosystems are responsible for an important part of the methane (CH4) emissions which likely to change with global warming. This study aims evaluate temperature-induced (from 5 20 °C) changes on microbial community structure and methanogenic pathways in five sub-Antarctic lake sediments from Magallanes strait Cape Horn, Chile. We combined situ CH4 flux measurements, production rates (MPRs), gene abundance quantification analysis (metabarcoding 16S rRNA gene). Under unamended...
Peatland pools are freshwater bodies that highly dynamic aquatic ecosystems because of their small size and development in organic-rich sediments. However, our ability to understand predict contribution both local global biogeochemical cycles under rapidly occurring environmental change is limited the spatiotemporal drivers patterns processes poorly understood. We used (1) pool data from 20 peatlands eastern Canada, United Kingdom, southern Patagonia (2) multi-year an undisturbed peatland...
It is commonly assumed that methane (CH4) released by lakes into the atmosphere mainly produced in anoxic sediment and transported diffusion or ebullition through water column to surface of lake. In contrast prevailing idea, it has been gradually established epilimnetic CH4 does not originate exclusively from sediments but also locally laterally littoral zone. Therefore, cycling epilimnion hypolimnion might be as closely linked previously thought. We utilized a high-resolution method used...
Abstract High latitudes are experiencing intense ecosystem changes with climate warming. The underlying methane (CH 4 ) cycling dynamics remain unresolved, despite its crucial climatic feedback. Atmospheric CH emissions heterogeneous, resulting from local geochemical drivers, global factors, and microbial production/consumption balance. Holistic studies mandatory to capture complexity. Here, we report a large set of integrated biogeochemical data 387 samples, using concerted sampling...
Peatlands are recognized as crucial greenhouse gas sources and sinks have been extensively studied. Their emissions exhibit high spatial heterogeneity when measured on site using flux chambers. However, the mechanism by which this variability behaves a very fine scale remains unclear. This study investigates fine-scale of from subantarctic
The concurrent short-term fluctuations of methane (CH4) and carbon dioxide (CO2) concentrations emissions in lakes are not well studied. Quantifying the differences daytime versus nighttime dynamics may provide information about controls over greenhouse gas production have relevance to lake budgets. In this study, diel variation CH4 CO2 concentration patterns were determined along water column 2 temperate with different trophic states during July 2015. results showed that shallow eutrophic...
Dissolved gas concentration in environmental water samples is usually determined by headspace equilibration (HE) techniques followed laboratory analyses. This method generally causes a time delay between field sampling and measurements that (i) impedes feedback of results would otherwise inform strategies, (ii) may affect the precision due to biological activity or leakage, (iii) require logistically complex procedures for transport storage samples. The development an on‐site measurement...