A5054732283- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Climate change and permafrost
- Soil Moisture and Remote Sensing
- Methane Hydrates and Related Phenomena
- Ocean Waves and Remote Sensing
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Astro and Planetary Science
- Planetary Science and Exploration
- Climate variability and models
- Clinical Nutrition and Gastroenterology
- Isotope Analysis in Ecology
- Ionosphere and magnetosphere dynamics
- Space Science and Extraterrestrial Life
- Metabolism and Genetic Disorders
- Oil Spill Detection and Mitigation
- Healthcare Systems and Challenges
- Underwater Acoustics Research
Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
2017-2024
Université Paris Sciences et Lettres
2018-2024
Centre National de la Recherche Scientifique
2018-2024
Centre National d'Études Spatiales
2024
Observatoire de Paris
2017-2024
Sorbonne Université
2018-2023
Abstract Climate change resulting in ocean warming, sea level rise, and ice melting has consequences for the global economy, navigation, security. The Copernicus Imaging Microwave Radiometer (CIMR) mission is a high priority candidate within European Expansion program. CIMR designed to observe more particularly Arctic environment. Sea surface temperature (SST), wind speed, salinity (SSS), concentration (SIC) are fundamental variables understanding, monitoring, predicting state of ice....
Abstract The Tool to Estimate Land Surface Emissivity from Microwave Submillimeter Waves (TELSEM 2 ) is linked a climatology of monthly emissivity estimates and provides parameterization the surface up 700 GHz, in framework preparation for Ice Cloud Imager (ICI) on board Meteorological Operational Satellite Second Generation (MetOp-SG). It an updated version Emissivities at Frequencies (TELSEM; Aires et al. 2011). This study presents continental snow ice sea emissivities TELSEM . relies upon...
Abstract. Mapping sea ice concentration (SIC) and understanding properties variability is important, especially today with the recent Arctic decline. Moreover, accurate estimation of effective temperature (Teff) at 50 GHz needed for atmospheric sounding applications over noise reduction in SIC estimates. At low microwave frequencies, sensitivity to atmosphere low, it possible derive parameters due penetration microwaves snow layers. In this study, we propose simple algorithms depth, snow–ice...
Abstract A Passive and Active Reference Microwave to Infrared Ocean (PARMIO) physical radiative transfer model has been selected by an international team of experts be used as a community ocean surface emissivity model. fast version this is developed within the framework European Organisation for Exploitation Meteorological Satellites (EUMETSAT) Numerical Weather Prediction Satellite Application Facilities visiting scientist programme: SURface Fast Emissivity Model (SURFEM‐Ocean),...
Abstract. Microwave radiometry and scatterometry, two complimentary modes of sensing the composition structure top meters to hundreds subsurface, are often difficult reconcile, both on Earth cryosphere icy moons Saturn. To help interpret model microwave scattering in porous, high-purity ices, we examine jointly 6.9 89 GHz AMSR2 vertical (V) horizontal (H) polarizations as well 5.2 ASCAT, 13.4 QuikSCAT, 13.5 OSCAT scatterometry wind-glazed region East Antarctic ice sheet. The data simulated...
Abstract. The Copernicus Imaging Microwave Radiometer (CIMR) is one of the high-priority missions for expansion program within European Space Agency (ESA). It designed to respond Union Arctic policy. Its channels, incidence angle, precision, and spatial resolutions have been selected observe Ocean with recommendations expressed by user communities. In this note, we present sensitivity analysis that has led choice CIMR channels. famous figure from Wilheit (1979), describing frequency passive...
Abstract The Copernicus Imaging Microwave Radiometer (CIMR) is currently being implemented by the European Space Agency (ESA) as a Expansion Mission primarily designed to observe Polar Regions in support of Integrated Policy for Arctic. It conically scanning microwave radiometer with polarized channels centered at 1.414, 6.925, 10.65, 18.7, and 36.5 GHz channel NEΔT between 0.2 0.7 K. A large rotating deployable mesh reflector will provide real‐aperture resolutions ranging from 60 (1.4 GHz)...
Abstract The sea surface temperature (SST), ocean wind speed (OWS), and salinity (SSS) are fundamental variables for understanding, monitoring, predicting the state of atmosphere. analysis these parameters from passive microwave satellite measurements requires a Radiative Transfer Model (RTM). In this study, we compare three RTMs 1.4 to 89 GHz. A data set observations Soil Moisture Active Passive (SMAP) Advanced Microwave Scanning Radiometer‐2 (AMSR2) collocated with atmospheric ECMWF...
Over the last 25 years, Arctic sea ice has seen its extent decline dramatically. Passive microwave observations, with their ability to penetrate clouds and independency sunlight, have been used provide concentration (SIC) measurements since 1970s. The Copernicus Imaging Microwave Radiometer (CIMR) is a high priority candidate mission within European Expansion program, special focus on observation of polar regions. It will observe at 6.9 10.65 GHz 15 km spatial resolution, 18.7 36.5 5...
© 2023 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses). Corresponding author: Emmanuel Dinnat, emmanuel.dinnat@nasa.gov
A new methodology has been described in Kilic et al. (Ice Concentration Retrieval from the Analysis of Microwaves: New Methodology Designed for Copernicus Imaging Microwave Radiometer, Remote Sensing 2020, 12, 1060, Part 1 this study) to estimate Sea Ice (SIC) satellite passive microwave observations between 6 and 36 GHz. The Microwaves (IceCREAM) algorithm is based on an optimal estimation, with a simple radiative transfer model derived at 0% 100% SIC. Observations low high frequencies have...
Icy surfaces across the solar system display unusual microwave radar and radiometry properties, including very high backscattering cross-sections polarization ratios. At low temperature, snow ice are transparent to microwaves, leading long path lengths multiple scattering. Yet despite large volume of available passive active satellite observations over Earth cryosphere, physical interpretation co-variability multi-frequency is still challenging, especially when trying reconcile observations....
Modeling sea ice microwave emissivities at large scales presents challenges, due to complex interactions between the signal and environment. For preparation of Copernicus Imaging Microwave Radiometer mission (CIMR) that focusses on pole monitoring, a pragmatic parameterization emissivity over Arctic is proposed, providing consistent parameterizations 1.4 36~GHz, for V H polarizations. Satellite-derived are calculated from AMSR2, SMAP, SMOS observations, subtracting atmospheric contributions...
Abstract. Mapping Sea Ice Concentration (SIC) and understanding sea ice properties variability is important especially today with the recent Arctic decline. Moreover, accurate estimation of effective temperature (Teff) at 50 GHz needed for atmospheric sounding applications over noise reduction in SIC estimates. At low microwave frequencies, sensitivity to atmosphere low, it possible derive parameters due penetration microwaves snow layers. In this study, we propose simple algorithms depth,...
Abstract. The Copernicus Imaging Microwave Radiometer (CIMR) is one of the high priority missions for expansion program within European Space Agency (ESA). It designed to respond Union Arctic policy. Its channels, incidence angle, precisions, and spatial resolutions have been selected observe Ocean with recommendations expressed by user communities. In this note, we present sensitivity analysis that has led choice CIMR channels. famous figure from Wilheit (1979), describing frequency passive...
Interpreting microwave data on icy moons in terms of physical parameters is a key challenge offered by observations Ganymede and Europa both the current Juno (NASA) MicroWave Radiometer (MWR) future JUICE (ESA) Submillimeter Wave Instrument (SWI). From sub-millimeter to decimeter scale wavelengths, radiometry sensitive different depths scatterer sizes: each frequency offers complementary information. Despite large volume available passive active satellite over Earth cryosphere,...
A suite of linear regressions is derived consecutively to derive i) an estimate snow depth, ii) the snow-ice interface temperature and, finally, iii) effective Teff -all from brightness (TB) observations C1 TCD Interactive commentPrinter-friendly version Discussion paper AMSR2 in Arctic Ocean during winter time.This developed with aid TB collocated weather forecast data, OIB depth data and IMB as well simulations TB, a thermodynamic model combination microwave emission model.Observed...
We model the sea foam emissivity at frequencies from 1 to 89 GHz. This is part of work done by an international science team develop a radiative transfer reference quality for ocean surface L band infrared frequencies. A study sensitivity different properties (foam layer thickness and upper limit void fraction) guided effort tune frequency polarization. The results show that differences between simulated observed brightness temperatures decrease when using tuned model.
Sea ice concentration, sea thickness, and snow depth over are important physical parameters for modeling the cryosphere. We present here preliminary results of a method to combine passive radiometer, altimeter, scatterometer, evidence their synergy. The benefit merging data from several instruments at level 1 is emphasized, through use classification methodology. This work performed in framework preparation future Copernicus missions CIMR CRISTAL, that will fly same time as ASCAT on board MetOp-SG.