C. O’Dell
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View article: Surface reflectance biases in XCH <sub>4</sub> retrievals from the 2.3 µm band are enhanced in the presence of aerosols
Surface reflectance biases in XCH <sub>4</sub> retrievals from the 2.3 µm band are enhanced in the presence of aerosols Open
In this work, we present the results of an observing system simulation experiment (OSSE) in which we investigate the emergence of a surface-reflectance-dependent bias in retrieved column-averaged dry-air mole fractions of methane (XCH4). O…
View article: Impact of Raman Scattering on SIF Retrievals From Hyperspectral Satellite Observations
Impact of Raman Scattering on SIF Retrievals From Hyperspectral Satellite Observations Open
Solar‐induced chlorophyll fluorescence (SIF) retrieved from spaceborne measurements is widely used as an indicator of vegetation activity. However, this weak emission can be confused with the inelastic scattering component of sunlight that…
View article: Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) X<sub>CO2</sub> Measurements With GGG2020 TCCON
Comparisons of the v11.1 Orbiting Carbon Observatory‐2 (OCO‐2) X<sub>CO2</sub> Measurements With GGG2020 TCCON Open
The Orbiting Carbon Observatory 2 (OCO‐2) is NASA's first Earth observation satellite mission dedicated to studying the sources and sinks of carbon dioxide (CO 2 ) on a global scale. The observations of reflected sunlight are inverted in a…
View article: Improving OCO‐2 XCO2 ${X}_{{\mathbf{C}\mathbf{O}}_{\mathbf{2}}}$ Retrievals Through the Scaling of Singular Value Decomposition‐Based Temperature and Water Vapor Profiles
Improving OCO‐2 XCO2 ${X}_{{\mathbf{C}\mathbf{O}}_{\mathbf{2}}}$ Retrievals Through the Scaling of Singular Value Decomposition‐Based Temperature and Water Vapor Profiles Open
NASA's Orbiting Carbon Observatory‐2 (OCO‐2) has the goal of accurately estimating column‐averaged dry‐air mole fractions of carbon dioxide (). In order to fit the measured radiances, many parameters besides are included in the optimal est…
View article: Conditional Diffusion-Based Retrieval of Atmospheric CO2 from Earth Observing Spectroscopy
Conditional Diffusion-Based Retrieval of Atmospheric CO2 from Earth Observing Spectroscopy Open
Satellite-based estimates of greenhouse gas (GHG) properties from observations of reflected solar spectra are integral for understanding and monitoring complex terrestrial systems and their impact on the carbon cycle due to their near glob…
View article: Uncertainty-aware Machine Learning Bias Correction and Filtering for OCO-2: Part 2
Uncertainty-aware Machine Learning Bias Correction and Filtering for OCO-2: Part 2 Open
View article: Uncertainty-aware Machine Learning Bias Correction and Filtering for OCO-2: Part 1
Uncertainty-aware Machine Learning Bias Correction and Filtering for OCO-2: Part 1 Open
View article: A global perspective on CO <sub>2</sub> satellite observations in high AOD conditions
A global perspective on CO <sub>2</sub> satellite observations in high AOD conditions Open
Satellite-based observations of carbon dioxide (CO2) are sensitive to all processes that affect the propagation of radiation in the atmosphere, including scattering and absorption by atmospheric aerosols. Therefore, accurate retrievals of …
View article: Quantifying CO<sub>2</sub> Emissions From Smaller Anthropogenic Point Sources Using OCO‐2 Target and OCO‐3 Snapshot Area Mapping Mode Observations
Quantifying CO<sub>2</sub> Emissions From Smaller Anthropogenic Point Sources Using OCO‐2 Target and OCO‐3 Snapshot Area Mapping Mode Observations Open
We quantify CO 2 emissions from smaller anthropogenic point sources compared with earlier satellite studies, which have mostly focused on mid‐sized (∼10 MtCO 2 /year) and larger fossil fuel burning power plants. Two types of Orbiting Carbo…
View article: Surface reflectance biases in XCH <sub>4</sub> retrievals from the 2.3 μm band are enhanced in the presence of aerosols
Surface reflectance biases in XCH <sub>4</sub> retrievals from the 2.3 μm band are enhanced in the presence of aerosols Open
In this work, we present the results of an observing system simulation experiment (OSSE) in which we investigate the emergence of a surface reflectance-dependent bias in retrieved column-averaged dry-air mole fractions of methane (XCH4). O…
View article: New Inflight Calibration of OCO-3’s A-Band for Version 11 Products
New Inflight Calibration of OCO-3’s A-Band for Version 11 Products Open
View article: Comment on egusphere-2024-2365
Comment on egusphere-2024-2365 Open
View article: Toward Low‐Latency Estimation of Atmospheric CO<sub>2</sub> Growth Rates Using Satellite Observations: Evaluating Sampling Errors of Satellite and In Situ Observing Approaches
Toward Low‐Latency Estimation of Atmospheric CO<sub>2</sub> Growth Rates Using Satellite Observations: Evaluating Sampling Errors of Satellite and In Situ Observing Approaches Open
The atmospheric CO 2 growth rate is a fundamental measure of climate forcing. NOAA's growth rate estimates, derived from in situ observations at the marine boundary layer (MBL), serve as the benchmark in policy and science. However, NOAA's…
View article: Comment on amt-2024-77
Comment on amt-2024-77 Open
Abstract. Satellite-based observations of carbon dioxide (CO2) are sensitive to all processes that affect the propagation of radiation in the atmosphere, including scattering and absorption by atmospheric aeroso…
View article: Comment on amt-2024-77
Comment on amt-2024-77 Open
Abstract. Satellite-based observations of carbon dioxide (CO2) are sensitive to all processes that affect the propagation of radiation in the atmosphere, including scattering and absorption by atmospheric aeroso…
View article: A global perspective on CO<sub>2</sub> satellite observations in high AOD conditions
A global perspective on CO<sub>2</sub> satellite observations in high AOD conditions Open
Satellite-based observations of carbon dioxide (CO2) are sensitive to all processes that affect the propagation of radiation in the atmosphere, including scattering and absorption by atmospheric aerosols. Therefore, accurate retrievals of …
View article: The importance of digital elevation model accuracy in X <sub> CO <sub>2</sub> </sub> retrievals: improving the Orbiting Carbon Observatory 2 Atmospheric Carbon Observations from Space version 11 retrieval product
The importance of digital elevation model accuracy in X <sub> CO <sub>2</sub> </sub> retrievals: improving the Orbiting Carbon Observatory 2 Atmospheric Carbon Observations from Space version 11 retrieval product Open
Knowledge of surface pressure is essential for calculating column-averaged dry-air mole fractions of trace gases, such as CO2 (XCO2). In the NASA Orbiting Carbon Observatory 2 (OCO-2) Atmospheric Carbon Observations from Space (ACOS) retri…
View article: The GeoCarb greenhouse gas retrieval algorithm: simulations and sensitivity to sources of uncertainty
The GeoCarb greenhouse gas retrieval algorithm: simulations and sensitivity to sources of uncertainty Open
The Geostationary Carbon Cycle Observatory (GeoCarb) was selected as NASA's second Earth Venture Mission (EVM-2). The scientific objectives of GeoCarb were to advance our knowledge of the carbon cycle, in particular, land–atmosphere fluxes…
View article: Towards Low-Latency Estimation of Atmospheric CO2 Growth Rates using Satellite Observations: Evaluating Sampling Errors of Satellite and In Situ Observing Approaches
Towards Low-Latency Estimation of Atmospheric CO2 Growth Rates using Satellite Observations: Evaluating Sampling Errors of Satellite and In Situ Observing Approaches Open
The atmospheric CO2 growth rate is a fundamental measure of climate forcing. NOAA’s growth rate estimates, derived from in situ observations at the marine boundary layer (MBL), serve as the benchmark in policy and science. However, NOAA’s …
View article: A nonlinear data-driven approach to bias correction of XCO <sub>2</sub> for NASA's OCO-2 ACOS version 10
A nonlinear data-driven approach to bias correction of XCO <sub>2</sub> for NASA's OCO-2 ACOS version 10 Open
Measurements of column-averaged dry air mole fraction of CO2 (termed XCO2) from the Orbiting Carbon Observatory-2 (OCO-2) contain systematic errors and regional-scale biases, often induced by forward model error or nonlinearity in the retr…
View article: Comment on egusphere-2023-2085
Comment on egusphere-2023-2085 Open
Abstract. Carbon dioxide (CO2) is the most important anthropogenic greenhouse gas. Its atmospheric concentration has increased by almost 50 % since the beginning of the industrial era, causing climate change. Fo…
View article: The importance of digital elevation model accuracy in X <sub>CO</sub> <sub> <sub>2</sub> </sub> retrievals: improving the OCO-2 ACOS v11 product
The importance of digital elevation model accuracy in X <sub>CO</sub> <sub> <sub>2</sub> </sub> retrievals: improving the OCO-2 ACOS v11 product Open
Knowledge of surface pressure is essential for calculating column average dry-air mole fractions of trace gases, such as CO2 (XCO2). In the NASA Orbiting Carbon Observatory 2 (OCO-2) Atmospheric Carbon Observations from Space (ACOS) retrie…
View article: Evaluating the consistency between OCO-2 and OCO-3 XCO <sub>2</sub> estimates derived from the NASA ACOS version 10 retrieval algorithm
Evaluating the consistency between OCO-2 and OCO-3 XCO <sub>2</sub> estimates derived from the NASA ACOS version 10 retrieval algorithm Open
The version 10 (v10) Atmospheric Carbon Observations from Space (ACOS) Level 2 full-physics (L2FP) retrieval algorithm has been applied to multiyear records of observations from NASA's Orbiting Carbon Observatory 2 and 3 sensors (OCO-2 and…
View article: The GeoCarb greenhouse gas retrieval algorithm: Simulations and sensitivity to sources of uncertainty
The GeoCarb greenhouse gas retrieval algorithm: Simulations and sensitivity to sources of uncertainty Open
The Geostationary Carbon Cycle Observatory (GeoCarb) was selected as NASA's second Earth Venture Mission (EVM-2). The scientific objectives of GeoCarb are to advance our knowledge of the carbon cycle, in particular land-atmosphere fluxes o…
View article: Comment on egusphere-2023-362
Comment on egusphere-2023-362 Open
Abstract. Measurements of column averaged, dry air mole fraction of CO2 (termed XCO2) from the Orbiting Carbon Obersvatory-2 (OCO-2) contain systematic errors and regional scale biases; often induced …
View article: Comment on egusphere-2023-362
Comment on egusphere-2023-362 Open
Abstract. Measurements of column averaged, dry air mole fraction of CO2 (termed XCO2) from the Orbiting Carbon Obersvatory-2 (OCO-2) contain systematic errors and regional scale biases; often induced …
View article: Neutral tropical African CO2 exchange estimated from aircraft and satellite observations
Neutral tropical African CO2 exchange estimated from aircraft and satellite observations Open
Tropical lands play an important role in the global carbon cycle yet their contribution remains uncertain owing to sparse observations. Satellite observations of atmospheric carbon dioxide (CO) have greatly increased spatial coverage over …
View article: A non-linear data driven approach to bias correction of XCO2 for OCO-2 NASA ACOS version 10
A non-linear data driven approach to bias correction of XCO2 for OCO-2 NASA ACOS version 10 Open
Measurements of column averaged, dry air mole fraction of CO2 (termed XCO2) from the Orbiting Carbon Obersvatory-2 (OCO-2) contain systematic errors and regional scale biases; often induced by forward model error or nonlinearity in the ret…
View article: National CO <sub>2</sub> budgets (2015–2020) inferred from atmospheric CO <sub>2</sub> observations in support of the global stocktake
National CO <sub>2</sub> budgets (2015–2020) inferred from atmospheric CO <sub>2</sub> observations in support of the global stocktake Open
Accurate accounting of emissions and removals of CO2 is critical for the planning and verification of emission reduction targets in support of the Paris Agreement. Here, we present a pilot dataset of country-specific net carbon exchange (N…
View article: Characterizing major anthropogenic point sources in the South African Highveld region using OCO-3 carbon dioxide Snapshot Area Maps and Sentinel-5P/TROPOMI nitrogen dioxide columns
Characterizing major anthropogenic point sources in the South African Highveld region using OCO-3 carbon dioxide Snapshot Area Maps and Sentinel-5P/TROPOMI nitrogen dioxide columns Open
We characterize major anthropogenic point sources in the South African Highveld region using Orbiting Carbon Observatory-3 (OCO-3) Snapshot Area Map (SAM) carbon dioxide (CO2) and Sentinel-5 Precursor (S5P) TROPOspheric Monitoring Instrume…