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DTSTART;TZID=Europe/Rome:20250612T143000
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DTSTAMP:20260417T154059
CREATED:20250612T125233Z
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UID:4571-1749738600-1749742200@sciencehub.esa.int
SUMMARY:The Hub Talks: Observing the Earth (water and) energy cycle from space to understand climate change
DESCRIPTION:Speaker: Dr. Meyssignac is a researcher at the Laboratoire d’Etudes en Géophysique et Océanographie Spatiale (LEGOS) and at the French Space National Center (CNES) in Toulouse\, France. His research focuses on understanding the variations of the global Earth energy-water cycle at regional and global scales through high precision geodetic satellite observations and modelling approaches. He investigates processes leading to changes in the Earth energy budget\, theEarth energy imbalance and the response of the energy-water cycle fluxes to greenhouse gases emissions. He is the author of more than 70 research articles and a lead author of the last IPCC report. He was awarded for his work the Christian Le Provost prize from the French national science academy in 2017 and theEGU/ESA Earth observation excellence award in 2021.  He is active in the World Climate Research Program (WCRP) as a leader of the Global Energy and Water Exchanges (GEWEX) Earth Energy Imbalance assessment and the Earth Energy imbalance trend case of the WCRP lighthouse activity on explaining and predicting Earth system change. \n\n\n\nAbstract: At decadal and longer time scales\, the Earth’s global energy cycle is governed by the difference between incoming solar radiation (TSI) and outgoing terrestrial radiation (OTR). The small but persistent imbalance between TSI and OSR —known as the Earth Energy Imbalance (EEI)—is the primary driver of long-term climate change. Constraining this imbalance with sufficient accuracy is critical for understanding EEI variations in time and predicting the climate system’s response to anthropogenic forcing. Satellite observations offer unprecedented global coverage and temporal continuity\, making them indispensable for tracking the key components of the energy budget. However\, achieving the required precision—on the order of tenths of a watt per square meter—remains a formidable challenge due to instrument calibration\, orbital stability\, sampling biases\, and inter-sensor consistency. \n\n\n\nThis presentation reviews the main satellite-based datasets used to observe Earth’s radiative fluxes\, ocean heat content\, and surface temperature. It examines how this satellite data constrain both the magnitude and variability of EEI and the associated climate feedback. We highlight the limitations of current observing systems\, the inconsistency among independent datasets\, and the difficulties in closing the energy budget at global scale. Moreover\, we discuss emerging efforts to integrate satellite altimetry (Sentinel 3 and 6)\, gravimetry (GRACE-FO and NGGM)\, and radiometry (CERES and ECO) to improve estimates of EEI\, determine its drivers and constrain the global energy budget. We outline the key remaining observational gaps and scientific questions that must be addressed to understand the processes driving temporal variations in the global energy cycle in response to greenhouse gases. One significant gap concerns the lack of observations on the role of deep atmospheric convection and its interaction with tropical circulation in modulating climate feedback. This should be a priority in the coming decade\, with missions such as EarthCARE\, AOS\, INCUS\, and WIVERN expected to address this need. \n\n\n\n\n\n\n\nMicrosoft Teams   \n\n\n\nJoin the meeting \n\n\n\nMeeting ID: 325 340 904 554 \n\n\n\nPasscode: Ym68Hd9B
URL:https://sciencehub.esa.int/event/the-hub-talks-observing-the-earth-water-and-energy-cycle-from-space-to-understand-climate-change/
ATTACH;FMTTYPE=image/png:https://sciencehub.esa.int/wp-content/uploads/2025/06/Screenshot-2025-06-12-at-14.53.06.png
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DTSTART;TZID=Europe/Rome:20250619T150000
DTEND;TZID=Europe/Rome:20250619T160000
DTSTAMP:20260417T154059
CREATED:20250612T132146Z
LAST-MODIFIED:20250918T134138Z
UID:4576-1750345200-1750348800@sciencehub.esa.int
SUMMARY:The Hub Talks: UK Gas Leak Detected from Space: An Unexpected Discovery Leading to Large ImpactThe Hub Talks:
DESCRIPTION:Speaker: Dr Emily Dowd is Research Fellow in Greenhouse Gas Modelling at the University of Leeds. She graduated from her PhD at the University of Leeds in 2024 and her thesis focused on analysing methane across difference spatial and temporal scales. Emily’s research focuses on using satellite data and chemical transport models to investigate changes in atmospheric methane. She is currently working on a project which models clumped isotopes of methane in a global 3D chemical transport model. Alongside her research\, Emily co-founded an outreach programme called SatSchool. SatSchool aims to introduce key Earth Observation concepts to 11-15 year olds by providing ready-made outreach materials which researchers can take into schools. This project has reached over 7000 students across the UK and continues to provide outreach in schools. Emily  was a visiting researcher at the Science Hub in 2023. \n\n\n\nAbstract: In spring 2023 a methane leak from a faulty gas pipeline was detected from space and successfully mitigated for the first time in the UK. The leak was discovered by GHGSat satellites while measuring methane emissions from a landfill near Cheltenham\, UK. The leak was then confirmed through ground-based mobile surveys\, providing the first validation of GHGSat’s emission estimates for an active gas leak. Methane is a powerful greenhouse gas that is 82 times more potent than carbon dioxide over 20 years and is a major contributor to climate change. Approximately 60% of global emissions come from human activity\, including oil and gas operations. This discovery is a prime example of how satellite data can play a crucial role in mitigating the human impact on climate change. \n\n\n\n\n\n\n\nMicrosoft Teams  \n\n\n\nJoin the meeting \n\n\n\nMeeting ID: 328 369 308 984 \n\n\n\nPasscode: fY6LQ6Le
URL:https://sciencehub.esa.int/event/the-hub-talks-uk-gas-leak-detected-from-space-an-unexpected-discovery-leading-to-large-impactthe-hub-talks/
LOCATION:Online
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