A5056161026- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Climate change and permafrost
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Peatlands and Wetlands Ecology
- Microbial Community Ecology and Physiology
- Soil Carbon and Nitrogen Dynamics
- Spectroscopy and Laser Applications
- Fire effects on ecosystems
- Tree Root and Stability Studies
- Geology and Paleoclimatology Research
- Climate variability and models
- Plant Water Relations and Carbon Dynamics
- Isotope Analysis in Ecology
- Radiomics and Machine Learning in Medical Imaging
- Cryospheric studies and observations
- Air Quality Monitoring and Forecasting
- Soil erosion and sediment transport
- Genomics and Phylogenetic Studies
- Plant responses to elevated CO2
- Hydrology and Watershed Management Studies
- CO2 Sequestration and Geologic Interactions
- Recycling and Waste Management Techniques
National Institute of Meteorological Sciences
2025
Cooperative Institute for Research in Environmental Sciences
2021-2024
University of Colorado Boulder
2021-2024
National Oceanic and Atmospheric Administration
2021-2024
Purdue University West Lafayette
2020-2022
Princeton University
2015-2018
Significance Microorganisms are known to live in the deep subsurface, kilometers below photic zone, but community-wide metabolic networks and trophic structures (the organization of their energy nutritional hierarchy) remain poorly understood. We show that an active subsurface lithoautotrophic microbial ecosystem (SLiME) under oligotrophic condition exists. Taxonomically metabolically diverse microorganisms supported, with sulfur-driven autotrophic denitrifiers predominating community....
We study the drivers behind global atmospheric methane (CH
Abstract. We have constructed an atmospheric inversion framework based on TM5-4DVAR to jointly assimilate measurements of methane and δ13C in order estimate source-specific emissions. Here we present global emission estimates from this for the period 1999–2016. a newly constructed, multi-agency database CH4 measurements. find that traditional CH4-only inversions are unlikely emissions consistent with data, assimilating data is necessary derive both Our attributes ca. 85 % post-2007 growth...
Abstract Atmospheric methane's rapid growth from late 2006 is unprecedented in the observational record. Assessment of atmospheric methane data attributes a large fraction this to increased natural emissions over tropics, which appear be responding changes anthropogenic climate forcing. Isotopically lighter measurements are consistent with recent being mainly driven by an increase microbial sources, particularly wetlands. The global budget currently disequilibrium and new inputs as yet...
Abstract Soil organic carbon (SOC) is a primary regulator of the forest–climate feedback. However, its indicative capability for soil CH 4 sink poorly understood due to incomplete knowledge underlying mechanisms. Therefore, SOC not explicitly included in current model estimation global forest sink. Here, using in-situ observations, meta-analysis, and process-based modeling, we provide evidence that constitutes an important variable governs We find enhanced with increasing content on regional...
Abstract Significant progress in permafrost carbon science made over the past decades include identification of vast stocks, development new pan‐Arctic maps, an increase terrestrial measurement sites for CO 2 and methane fluxes, important factors affecting cycling, including vegetation changes, periods soil freezing thawing, wildfire, other disturbance events. Process‐based modeling studies now key elements cycling advances statistical inverse enhance understanding region C budgets. By...
Abstract Atmospheric concentrations of methane, a powerful greenhouse gas, have strongly increased since 2007. Measurements stable carbon isotopes methane can constrain emissions if the isotopic compositions are known; however, from wetlands poorly constrained despite their importance. Here, we use process-based biogeochemistry model to calculate composition global wetland emissions. We estimate mean signature −61.3 ± 0.7‰ and find that tropical enriched by ~11‰ relative boreal wetlands. Our...
Abstract. In the face of ongoing and projected climatic changes, precipitation manipulation experiments (PMEs) have produced a wealth data about effects changes on soils. response, researchers undertaken number synthetic efforts. Several meta-analyses been conducted, each revealing new aspects soil responses to changes. Here, we conducted comparative analysis findings 16 focused 42 response variables, covering wide range processes. We examine individual variables as well more integrative...
Monitoring greenhouse gases (GHGs) such as CO<sub>2</sub> and CH<sub>4</sub> is essential for understanding their role in climate change informing mitigation strategies. The ASIA-AQ campaign, a multi-country field study on Asian air quality during winter, was jointly organized by research institutions from various countries NASA. As part of the mobile Fourier Transform Spectrometer (FTS) deployed at Ewha Womans University (EW) Seoul targeted observations. FTS, while offering advantage...
Methane is experiencing an accelerating increase in the atmosphere globally. Of tools researchers have to diagnosis and determine cause of rapidly changing sources sinks methane, its carbon isotope composition, &#948;13C-CH4, a promising option reduce uncertainty provide constraints on methane atmospheric inversions. A building consensus literature points towards wetland emissions as driving force behind emissions, yet our ability be prescriptive &#948;13C-CH4 flux remains uncertain....
Abstract Quantification of methane (CH 4 ) emissions from wetlands and its sinks uplands is still fraught with large uncertainties. Here, a biogeochemistry model was revised, parameterized, verified for various wetland ecosystems across the globe. The then extrapolated to global scale quantify uncertainty induced four different types sources including parameterization, type distribution, area meteorological input. We found that are 212 ± 62 32 Tg CH year −1 (1Tg = 10 12 g) due uncertain...
Abstract Freshwater ecosystem contributions to the global methane budget remains most uncertain among natural sources. With warming and accompanying carbon release from thawed permafrost thermokarst lake expansion, increase of emissions could be large. However, impact relative importance various factors related remain uncertain. Based on diverse characteristics incorporated in modeling observational data, we calibrate verify a biogeochemistry model. The model is then applied estimate examine...
Atmospheric methane’s rapid growth from 2006 to the present is unprecedented in observational record. Isotopic evidence implies mainly driven by an increase biogenically-sourced emissions, both wetlands and ruminants, waste. A significant part of current rise may come not direct anthropogenic emissions land use changes, but rather a combination natural biogenic feedback responses, occurring response forcing. Although microbial agricultural waste have increased between 2006-2020 about 35...
Abstract In the Arctic, spatiotemporal variation of net methane uptake in upland soils depends on unresolved interactive controls between edaphic and microbial factors not yet included current models, underpinning uncertainty upscaling Arctic budget. Here we show that Greenland are consistent sinks (−1.83 ± 0.19 nmol g −1 dw d ) across a N-S (64–83 °N) pedoclimatic transect. We demonstrate oxidizers abundance, soil pH, available copper important spatial oxidation. revised biogeochemical...
Abstract Recent field studies have documented a surprisingly strong and consistent methane sink in arctic mineral soils, thought to be due high‐affinity methanotrophy. However, the distinctive physiology of these methanotrophs is poorly represented mechanistic models. We developed new model, constrained by microcosm experiments, simulate activity methanotrophs. The model was tested against soil core‐thawing experiments field‐based measurements fluxes compared conventional Our simulations...
Metatranscriptomics has recently been applied to investigate the active biogeochemical processes and elemental cycles, in situ responses of microbiomes environmental stimuli stress factors. De novo assembly RNA-Sequencing (RNA-Seq) data can reveal a more detailed description metabolic interactions amongst microbial communities. However, quality assemblies depiction network provided by various de assemblers have not yet thoroughly assessed. In this study, we compared 15 metatranscriptomic for...
Methane (CH4) is the second most significant contributor to climate change after carbon dioxide (CO2), accounting for approximately 20% of contributions from all well-mixed greenhouse gases. Understanding spatiotemporal distributions and relevant long-term trends crucial identifying sources, sinks, impacts on climate. Hyperspectral thermal infrared (TIR) sounders, including Atmospheric Infrared Sounder (AIRS), Cross-track (CrIS), Sounding Interferometer (IASI), have been used measure global...
GIEMS2 represents the minimum extents of northern wetlands.**GLWD provides a representation maximum extent wetlands.***These numbers are derived from CT natural microbial emissions, which include emissions wetlands, river/lake/pond systems, and possibly wild animals (despite small amount).
Abstract. Wetlands are the largest natural source of methane (CH4) emissions globally. Northern wetlands (>45° N), accounting for 42 % global wetland area, increasingly vulnerable to carbon loss, especially as CH4 may accelerate under intensified high-latitude warming. However, magnitude and spatial patterns remain relatively uncertain. Here we present estimates daily fluxes obtained using a new machine learning-based upscaling framework (WetCH4) that applies most complete database eddy...
The Arctic is undergoing rapid changes in climate, altering the status and functioning of high-latitude soils permafrost. vast majority studies on permafrost are conducted during summer period due to ease accessibility, sampling, instrument operation, making measurements, comparison winter transition seasons. However, there increasing evidence that microbial activity continues outside period. Moreover, it becoming clear understanding seasonal dynamics critical importance, especially...
Methane (CH4) is the second most significant contributor to climate change after carbon dioxide (CO2), accounting for approximately 20% of contributions from all well-mixed greenhouse gases. Understanding spatiotemporal distributions, and relevant long-term trends are crucial identifying sources, sinks, impacts on climate. Hyperspectral thermal infrared (TIR) sounders, including Atmospheric Infrared Sounder (AIRS), Cross-track (CrIS), Sounding Interferometer (IASI), have been used measure...
Abstract. Understanding the sources and sinks of methane (CH4) is critical to both predicting mitigating future climate change. There are large uncertainties in global budget atmospheric CH4, but natural emissions estimated be a similar magnitude anthropogenic emissions. To understand CH4 flux from biogenic United States (US) America, multi-scale observation network focused on rates, processes, scaling methods required. This can achieved with ground-based observations that distributed based...
Abstract. Understanding the sources and sinks of CH4 is critical to both predicting mitigating future climate change. There are large uncertainties in global budget atmospheric CH4, but natural emissions estimated be a similar magnitude total anthropogenic emissions. The largest uncertainty scaling bottom-up estimates stem from limited ground-based measurements misalignment between drivers fluxes current land use classifications. To understand flux potential ecosystems agricultural lands...