Steven C. Wofsy
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View article: Enhanced radiative cooling by large aerosol particles from wildfire-driven thunderstorms
Enhanced radiative cooling by large aerosol particles from wildfire-driven thunderstorms Open
Large wildfires can generate pyrocumulonimbus (pyroCb) clouds, injecting massive quantities of smoke aerosols into the upper troposphere and lower stratosphere (UT/LS), where they persist for months and affect climate. The radiative effect…
View article: Enhanced radiative cooling by large aerosol particles from wildfire-driven thunderstorms
Enhanced radiative cooling by large aerosol particles from wildfire-driven thunderstorms Open
Large wildfires can generate pyrocumulonimbus (pyroCb) clouds, injecting massive quantities of smoke aerosols into the upper troposphere and lower stratosphere (UT/LS), where they persist for months and affect climate. The radiative effect…
View article: Integrating MethaneAIR aircraft and TROPOMI satellite observations in the Integrated Methane Inversion (IMI) to optimize methane emissions
Integrating MethaneAIR aircraft and TROPOMI satellite observations in the Integrated Methane Inversion (IMI) to optimize methane emissions Open
The MethaneAIR aircraft remote sensing instrument observes methane dry air column mixing ratios (XCH4) over ~100×100 km2 scenes with sub-km resolution, from which methane emissions can be inferred by inverse analysis with an atmospheric tr…
View article: Conditions Necessary for Chlorine Activation in the Midlatitude Summer Lower Stratosphere
Conditions Necessary for Chlorine Activation in the Midlatitude Summer Lower Stratosphere Open
Studies have suggested that ClO could be enhanced within convectively influenced air masses in the North American Monsoon Anticyclone due to low temperature and elevated water mixing ratio conditions that are conducive to chlorine activati…
View article: Surveying Methane Point-Source Super-Emissions across Oil and Gas Basins with MethaneSAT
Surveying Methane Point-Source Super-Emissions across Oil and Gas Basins with MethaneSAT Open
Methane emissions from the oil and gas (O&G) industry play a major role in the global methane budget. The MethaneSAT mission, which operated between March 2024 and June 2025, was designed to provide high-quality data on O&G methane…
View article: Detection and quantification of methane plumes with the MethaneAIR airborne spectrometer
Detection and quantification of methane plumes with the MethaneAIR airborne spectrometer Open
The MethaneAIR imaging spectrometer was originally developed as an airborne demonstrator of the MethaneSAT satellite mission. MethaneAIR enables accurate methane concentration retrievals from high-spectral-resolution measurements in the 16…
View article: What is Endangered now? Climate Science at the Crossroads
What is Endangered now? Climate Science at the Crossroads Open
View article: A top-down view of global and regional carbon budgets from an ensemble of atmospheric inversions
A top-down view of global and regional carbon budgets from an ensemble of atmospheric inversions Open
International audience
View article: Aircraft observations of biomass burning pollutants in the equatorial lower stratosphere over the tropical western Pacific during boreal winter
Aircraft observations of biomass burning pollutants in the equatorial lower stratosphere over the tropical western Pacific during boreal winter Open
Recent studies hypothesize that emissions from fires reaching the stratosphere can provide aerosols and aerosol precursors that initiate stratospheric ozone loss and lead to radiative heating of the stratosphere and cooling of the surface.…
View article: Assessment of methane emissions from US onshore oil and gas production using MethaneAIR measurements
Assessment of methane emissions from US onshore oil and gas production using MethaneAIR measurements Open
Mitigation of methane emissions from the oil and gas sector is an effective way to reduce the near-term climate warming and losses of a valuable energy resource. The oil and gas value chain contributes at least 25 % of anthropogenic methan…
View article: What Is Endangered Now? Climate Science at the Crossroads
What Is Endangered Now? Climate Science at the Crossroads Open
The greenhouse gas “endangerment finding” of the U.S. Environmental Protection Agency (EPA), established in 2009 after a 2006 U.S. Supreme Court case (Massachusetts vs. EPA) in which we participated as amicus curiae (friends of the court),…
View article: Small emission sources in aggregate disproportionately account for a large majority of total methane emissions from the US oil and gas sector
Small emission sources in aggregate disproportionately account for a large majority of total methane emissions from the US oil and gas sector Open
Reducing methane emissions from the oil and gas (oil–gas) sector has been identified as a critically important global strategy for reducing near-term climate warming. Recent measurements, especially by satellite and aerial remote sensing, …
View article: Remote sensing of methane point sources with the MethaneAIR airborne spectrometer
Remote sensing of methane point sources with the MethaneAIR airborne spectrometer Open
The MethaneAIR imaging spectrometer was originally developed as an airborne demonstrator of the MethaneSAT satellite mission. MethaneAIR enables accurate methane concentration retrievals from high spectral resolution measurements in the 16…
View article: Deep Learning for Clouds and Cloud Shadow Segmentation in Methane Satellite and Airborne Imaging Spectroscopy
Deep Learning for Clouds and Cloud Shadow Segmentation in Methane Satellite and Airborne Imaging Spectroscopy Open
View article: Aircraft Observations of Continental Pollution In the Equatorial Lower Stratosphere over the Tropical Western Pacific During Boreal Winter
Aircraft Observations of Continental Pollution In the Equatorial Lower Stratosphere over the Tropical Western Pacific During Boreal Winter Open
Recent studies hypothesize that emissions from fires reaching the stratosphere can provide aerosols and aerosol precursors that initiate stratospheric ozone loss and lead to radiative heating of the stratosphere and cooling of the surface.…
View article: Age of air from in situ trace gas measurements: insights from a new technique
Age of air from in situ trace gas measurements: insights from a new technique Open
The age of air is an important transport diagnostic that can be derived from trace gas measurements and compared to global chemistry climate model output. We describe a new technique to calculate the age of air, measuring transport times f…
View article: Enhanced Radiative Cooling by Large Aerosol Particles from Pyrocumulonimbus
Enhanced Radiative Cooling by Large Aerosol Particles from Pyrocumulonimbus Open
Large wildfires can generate pyrocumulonimbus (pyroCb) clouds that transport substantial amounts of smoke into the upper troposphere and lower stratosphere (UT/LS), perturbing aerosol budget and properties in these regions. Despite project…
View article: Methane retrieval from MethaneAIR using the CO <sub>2</sub> proxy approach: a demonstration for the upcoming MethaneSAT mission
Methane retrieval from MethaneAIR using the CO <sub>2</sub> proxy approach: a demonstration for the upcoming MethaneSAT mission Open
Reducing methane (CH4) emissions from the oil and gas (O&G) sector is crucial for mitigating climate change in the near term. MethaneSAT is an upcoming satellite mission designed to monitor basin-wide O&G emissions globally, provid…
View article: Constructing a measurement-based spatially explicit inventory of US oil and gas methane emissions (2021)
Constructing a measurement-based spatially explicit inventory of US oil and gas methane emissions (2021) Open
Accurate and comprehensive quantification of oil and gas methane emissions is pivotal in informing effective methane mitigation policies while also supporting the assessment and tracking of progress towards emissions reduction targets set …
View article: Airborne observations of upper troposphere and lower stratosphere composition change in active convection producing above-anvil cirrus plumes
Airborne observations of upper troposphere and lower stratosphere composition change in active convection producing above-anvil cirrus plumes Open
Tropopause-overshooting convection in the midlatitudes provides a rapid transport pathway for air from the lower troposphere to reach the upper troposphere and lower stratosphere (UTLS) and can result in the formation of above-anvil cirrus…
View article: Sensitive Response of Atmospheric Oxidative Capacity to the Uncertainty in the Emissions of Nitric Oxide (NO) From Soils in Amazonia
Sensitive Response of Atmospheric Oxidative Capacity to the Uncertainty in the Emissions of Nitric Oxide (NO) From Soils in Amazonia Open
Soils are a major source of nitrogen oxides, which in the atmosphere help govern its oxidative capacity. Thus the response of soil nitric oxide (NO) emissions to forcings such as warming or forest loss has a meaningful impact on global atm…
View article: Age of air from in situ trace gas measurements: Insights from a new technique
Age of air from in situ trace gas measurements: Insights from a new technique Open
The age of air is an important transport diagnostic that can be derived from trace gas measurements and compared to global chemistry climate model output. We describe a new technique to calculate the age of air, measuring transport times f…
View article: Comment on egusphere-2024-1402
Comment on egusphere-2024-1402 Open
Abstract. Reducing methane emissions from the oil and gas (oil/gas) sector has been identified as a critically important global strategy for reducing near-term climate warming. Recent measurements, especially by satellite …
View article: Small emission sources disproportionately account for a large majority of total methane emissions from the US oil and gas sector
Small emission sources disproportionately account for a large majority of total methane emissions from the US oil and gas sector Open
Reducing methane emissions from the oil and gas (oil/gas) sector has been identified as a critically important global strategy for reducing near-term climate warming. Recent measurements, especially by satellite and aerial remote sensing, …
View article: Contrasting carbon cycle responses to dry (2015 El Niño) and wet (2008 La Niña) extreme events at an Amazon tropical forest
Contrasting carbon cycle responses to dry (2015 El Niño) and wet (2008 La Niña) extreme events at an Amazon tropical forest Open
View article: The Total Carbon Column Observing Network's GGG2020 data version
The Total Carbon Column Observing Network's GGG2020 data version Open
The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs), beginning in 2004, from over 30 current or past measurement sites around the world using solar absorption spectros…
View article: Comment on essd-2024-72
Comment on essd-2024-72 Open
Abstract. Accurate and comprehensive quantification of oil and gas methane emissions is pivotal in informing effective methane mitigation policies, while also supporting the assessment and tracking of progress towards emis…
View article: Comment on essd-2024-72
Comment on essd-2024-72 Open
Abstract. Accurate and comprehensive quantification of oil and gas methane emissions is pivotal in informing effective methane mitigation policies, while also supporting the assessment and tracking of progress towards emis…
View article: Comment on essd-2024-72
Comment on essd-2024-72 Open
Abstract. Accurate and comprehensive quantification of oil and gas methane emissions is pivotal in informing effective methane mitigation policies, while also supporting the assessment and tracking of progress towards emis…
View article: Supplementary material to "Constructing a measurement-based spatially explicit inventory of US oil and gas methane emissions"
Supplementary material to "Constructing a measurement-based spatially explicit inventory of US oil and gas methane emissions" Open