Craig Donlon
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View article: Wind‐Driven Control of Shelf‐Sea CO<sub>2</sub> Sinks
Wind‐Driven Control of Shelf‐Sea CO<sub>2</sub> Sinks Open
Continental shelf surface waters are considered a variable but increasing sink of atmospheric carbon dioxide (CO 2 ), but the mechanisms controlling these increasing sinks are unclear. We identify that the winter wind‐driven surface atmosp…
View article: Diverse Techniques in Estimating Integrated Water Vapor for Calibration and Validation of Satellite Altimetry
Diverse Techniques in Estimating Integrated Water Vapor for Calibration and Validation of Satellite Altimetry Open
In satellite altimetry calibration, the atmosphere’s integrated water vapor content has been customarily derived through the Global Navigation Satellite Systems (GNSS), principally over land where the satellite radiometer is not operationa…
View article: Author Correction: Enhanced ocean CO2 uptake due to near surface temperature gradients
Author Correction: Enhanced ocean CO2 uptake due to near surface temperature gradients Open
View article: Benefits of a second tandem flight phase between two successive satellite altimetry missions for assessing instrumental stability
Benefits of a second tandem flight phase between two successive satellite altimetry missions for assessing instrumental stability Open
Five successive reference missions, TOPEX/Poseidon, Jason-1, Jason-2, Jason-3, and more recently Sentinel-6 Michael Freilich, have ensured the continuity and stability of the satellite altimetry data record. Tandem flight phases have playe…
View article: Preliminary Assessment of the Impact of the Copernicus Imaging Microwave Radiometer (CIMR) on the Copernicus Mediterranean Sea Surface Temperature L4 Analyses
Preliminary Assessment of the Impact of the Copernicus Imaging Microwave Radiometer (CIMR) on the Copernicus Mediterranean Sea Surface Temperature L4 Analyses Open
This study evaluates the potential impact of the Copernicus Imaging Microwave Radiometer (CIMR) mission on the sea surface temperature (SST) products of the Mediterranean Sea. Currently, infrared (IR) radiometers provide accurate, high-res…
View article: Shipborne comparison of infrared and passive microwave radiometers for sea surface temperature observations
Shipborne comparison of infrared and passive microwave radiometers for sea surface temperature observations Open
In the spring of 2021, a shipborne comparison of sea surface temperature (SST) measurements was undertaken using thermal infrared (IR) and passive microwave (PMW) radiometers. The Danish Meteorological Institute (DMI) and the Technical Uni…
View article: Assessing the impact of future altimeter constellations in the Met Office global ocean forecasting system
Assessing the impact of future altimeter constellations in the Met Office global ocean forecasting system Open
Satellite altimeter measurements of sea surface height (SSH) are a crucial component of current operational ocean forecasting systems. The launch of the Surface Water and Ocean Topography (SWOT) wide-swath altimeter (WiSA) mission is bring…
View article: Influence of Ocean Currents on Wave Modeling and Satellite Observations: Insights From the One Ocean Expedition
Influence of Ocean Currents on Wave Modeling and Satellite Observations: Insights From the One Ocean Expedition Open
This study investigates the influence of ocean currents on wave modeling and satellite observations using in situ wave measurements from the One Ocean Expedition 2021–2023. In January 2023, six OpenMetBuoy drifters were deployed in the Agu…
View article: Enhanced ocean CO2 uptake due to near-surface temperature gradients
Enhanced ocean CO2 uptake due to near-surface temperature gradients Open
The ocean annually absorbs about a quarter of all anthropogenic carbon dioxide (CO 2 ) emissions. Global estimates of air–sea CO 2 fluxes are typically based on bulk measurements of CO 2 in air and seawater and neglect the effects of verti…
View article: Local Gravity and Geoid Improvements around the Gavdos Satellite Altimetry Cal/Val Site
Local Gravity and Geoid Improvements around the Gavdos Satellite Altimetry Cal/Val Site Open
The isle of Gavdos, and its wider area, is one of the few places worldwide where the calibration and validation of altimetric satellites has been carried out during the last, more than, two decades using dedicated techniques at sea and on …
View article: Improving the Estimation of Lake Ice Thickness with High-Resolution Radar Altimetry Data
Improving the Estimation of Lake Ice Thickness with High-Resolution Radar Altimetry Data Open
Lake ice thickness (LIT) is a sensitive indicator of climate change, identified as a thematic variable of Lakes as an Essential Climate Variable (ECV) by the Global Climate Observing System (GCOS). Here, we present a novel and efficient an…
View article: Uncertainty in Sea State Observations from Satellite Altimeters and Buoys during the Jason-3/Sentinel-6 MF Tandem Experiment
Uncertainty in Sea State Observations from Satellite Altimeters and Buoys during the Jason-3/Sentinel-6 MF Tandem Experiment Open
The Copernicus Sentinel-6 Michael Freilich (S6-MF) and Jason-3 (J3) Tandem Experiment (S6-JTEX) provided over 12 months of closely collocated altimeter sea state measurements, acquired in “low-resolution” (LR) and synthetic aperture radar …
View article: The impact of simulated total surface current velocity observations on operational ocean forecasting and requirements for future satellite missions
The impact of simulated total surface current velocity observations on operational ocean forecasting and requirements for future satellite missions Open
Operational forecasts rely on accurate and timely observations and it is important that the ocean forecasting community demonstrates the impact of those observations to the observing community and its funders while providing feedback on re…
View article: Georectifying drone image data over water surfaces without fixed ground control: Methodology, uncertainty assessment and application over an estuarine environment
Georectifying drone image data over water surfaces without fixed ground control: Methodology, uncertainty assessment and application over an estuarine environment Open
Light-weight consumer-grade drones have the potential to provide geospatial image data to study a broad range of oceanic processes. However, rigorously tested methodologies to effectively and accurately geolocate and rectify these image da…
View article: Benefits of a second tandem flight phase between two successive satellite altimetry missions for assessing the instrumental stability
Benefits of a second tandem flight phase between two successive satellite altimetry missions for assessing the instrumental stability Open
The five successive reference missions, TOPEX/Poseidon, Jason-1, Jason-2, Jason-3, and more recently Sentinel-6 Michael Freilich, have ensured the continuity and stability of the altimetry data record. Tandem flight phases have played a ke…
View article: Impact of assimilating satellite surface velocity observations in the Mercator Ocean International analysis and forecasting global 1/4° system
Impact of assimilating satellite surface velocity observations in the Mercator Ocean International analysis and forecasting global 1/4° system Open
Representing and forecasting global ocean velocities is challenging. Velocity observations are scarce and sparse, and are rarely assimilated in a global ocean configuration. Recently, different satellite mission candidates have been propos…
View article: Improving the Estimation of Lake Ice Thickness with High Resolution Radar Altimetry Data
Improving the Estimation of Lake Ice Thickness with High Resolution Radar Altimetry Data Open
Lake ice thickness (LIT) is a sensitive indicator of climate change identified as a thematic variable of Lakes as an Essential Climate Variable (ECV) by the Global Climate Observing System (GCOS). Here, we present a novel and efficient ana…
View article: Utilizing the Sentinel-6 Michael Freilich Equivalent Number of Looks for Sea State Applications
Utilizing the Sentinel-6 Michael Freilich Equivalent Number of Looks for Sea State Applications Open
Sentinel-6 Michael Freilich (S6-MF) is the first altimeter operating in a continuous high-rate pulse mode, i.e., interleaved mode. This ensures the generation of low-resolution (LR) mode measurements with a pulse repetition frequency (PRF)…
View article: Assessing the potential impact of assimilating total surface current velocities in the Met Office’s global ocean forecasting system
Assessing the potential impact of assimilating total surface current velocities in the Met Office’s global ocean forecasting system Open
Accurate prediction of ocean surface currents is important for marine safety, ship routing, tracking of pollutants and in coupled forecasting. Presently, velocity observations are not routinely assimilated in global ocean forecasting syste…
View article: Comment on egusphere-2024-756
Comment on egusphere-2024-756 Open
Abstract. Satellite altimeter measurements of Sea Level Anomaly (SLA) are a crucial component of current operational ocean forecasting systems. The launch of the SWOT wide-swath altimeter mission is bringing a step change …
View article: Comment on egusphere-2024-542
Comment on egusphere-2024-542 Open
Abstract. In the spring of 2021, a shipborne comparison of sea surface temperature (SST) measurements was undertaken using Thermal Infrared (TIR) and Passive Microwave (PMW) radiometers. The Danish Meteorological Institute…
View article: Satellite-based time-series of sea-surface temperature since 1980 for climate applications
Satellite-based time-series of sea-surface temperature since 1980 for climate applications Open
View article: Assessing the impact of future altimeter constellations in the Met Office global ocean forecasting system
Assessing the impact of future altimeter constellations in the Met Office global ocean forecasting system Open
Satellite altimeter measurements of Sea Level Anomaly (SLA) are a crucial component of current operational ocean forecasting systems. The launch of the SWOT wide-swath altimeter mission is bringing a step change in our observing capacity w…
View article: Optimal Configuration of Omega-Kappa FF-SAR Processing for Specular and Non-Specular Targets in Altimetric Data: The Sentinel-6 Michael Freilich Study Case
Optimal Configuration of Omega-Kappa FF-SAR Processing for Specular and Non-Specular Targets in Altimetric Data: The Sentinel-6 Michael Freilich Study Case Open
In this study, the full-focusing (FF) algorithm is reviewed with the objective of optimizing it for processing data from different types of surfaces probed in altimetry. In particular, this work aims to provide a set of optimal FF processi…
View article: Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations
Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations Open
In the spring of 2021, a shipborne comparison of sea surface temperature (SST) measurements was undertaken using Thermal Infrared (TIR) and Passive Microwave (PMW) radiometers. The Danish Meteorological Institute (DMI) and the Technical Un…
View article: How to benefit from multi-sensor synergy using open Ocean Virtual Laboratory tools
How to benefit from multi-sensor synergy using open Ocean Virtual Laboratory tools Open
In the past decade, the emergence of new satellites and sensors has facilitated the observation of a diverse range of oceanic physical variables across various scales. For instance, the Sentinel 1-2-3-6 program encompasses sensors like SAR…
View article: Towards Ice Sheet and Ice Shelf Meltwater Profile Retrieval from Copernicus Imaging Microwave Radiometer (CIMR)
Towards Ice Sheet and Ice Shelf Meltwater Profile Retrieval from Copernicus Imaging Microwave Radiometer (CIMR) Open
Successful adaptation and mitigation of rising sea level demands improved constraints on emerging ice sheet processes controlling the magnitude and rate of sea level change in a warming climate. Therefore, it is vital to enhance the confid…
View article: 2022 CEOS International Thermal Infrared Radiometer Comparison. Part I: Laboratory Comparison of Radiometers and Blackbodies
2022 CEOS International Thermal Infrared Radiometer Comparison. Part I: Laboratory Comparison of Radiometers and Blackbodies Open
An international comparison of field deployed radiometers for sea surface skin temperature (SST skin ) retrieval was conducted in June 2022. The campaign comprised a laboratory comparison and a field comparison. In the laboratory part, the…
View article: 2022 CEOS International Thermal Infrared Radiometer Comparison. Part II: Field Comparison of Radiometers
2022 CEOS International Thermal Infrared Radiometer Comparison. Part II: Field Comparison of Radiometers Open
An international comparison of field-deployed radiometers for sea surface skin temperature (SST skin ) retrieval was conducted during two weeks in June 2022. The comparison comprised a laboratory comparison and a field comparison. The fiel…
View article: The increasing importance of satellite observations to assess the ocean carbon sink and ocean acidification
The increasing importance of satellite observations to assess the ocean carbon sink and ocean acidification Open
The strong control that the emissions of carbon dioxide (CO2) have over Earth's climate identifies the need for accurate quantification of the emitted CO2 and its redistribution within the Earth system. The ocean annually absorbs more than…