C
Camille Risi
Researcher at Centre national de la recherche scientifique
Publications - 114
Citations - 7419
Camille Risi is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Precipitation & Water vapor. The author has an hindex of 44, co-authored 105 publications receiving 6042 citations. Previous affiliations of Camille Risi include École Normale Supérieure & University of Colorado Boulder.
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Isotopic exchange on the diurnal scale between near-surface snow and lower atmospheric water vapor at Kohnen station, East Antarctica
Francois Ritter,Francois Ritter,Hans Christian Steen-Larsen,Hans Christian Steen-Larsen,Martin Werner,Valérie Masson-Delmotte,Anais Orsi,Melanie Behrens,Gerit Birnbaum,Johannes Freitag,Camille Risi,Sepp Kipfstuhl +11 more
TL;DR: In this article, the authors present continuous measurements of water vapor isotopes performed in East Antarctica (Kohnen station) from December 2013 to January 2014 using a laser spectrometer.
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Impact of atmospheric convection on south Tibet summer precipitation isotopologue composition using a combination of in situ measurements, satellite data, and atmospheric general circulation modeling
You He,You He,Camille Risi,Jing Gao,Valérie Masson-Delmotte,Tandong Yao,Chun-Ta Lai,Yongjian Ding,John Worden,Christian Frankenberg,Hélène Chepfer,G. Cesana +11 more
TL;DR: In this paper, the authors investigated how atmospheric convection affects the summer variability of δ18O in precipitation (δ18Op) and δD in water vapor(δDv) at the daily scale.
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Water vapor isotopologue retrievals from high-resolution GOSAT shortwave infrared spectra
Christian Frankenberg,Debra Wunch,Geoffrey C. Toon,Camille Risi,R. A. Scheepmaker,Jung-Eun Lee,Paul O. Wennberg,John Worden +7 more
Abstract: . Remote sensing of the isotopic composition of water vapor can provide valuable information on the hydrological cycle. Here, we demonstrate the feasibility of retrievals of the relative abundance of HDO (the HDO/H2O ratio) from the Japanese GOSAT satellite. For this purpose, we use high spectral resolution nadir radiances around 6400 cm−1 (1.56 μm) to retrieve vertical column amounts of H2O and HDO. Retrievals of H2O correlate well with ECMWF (European Centre for Medium-Range Weather Forecasts) integrated profiles (r2 = 0.96). Typical precision errors in the retrieved column-averaged deuterium depletion (δD) are 20–40‰. We compare δD against a TCCON (Total Carbon Column Observing Network) ground-based station in Lamont, Oklahoma. Using retrievals in very dry areas over Antarctica, we detect a small systematic offset in retrieved H2O and HDO column amounts and take this into account for a bias correction of δD. Monthly averages of δD in the June 2009 to September 2011 time frame are well correlated with TCCON (r2 = 0.79) and exhibit a slope of 0.98 (1.23 if not bias corrected). We also compare seasonal averages on the global scale with results from the SCIAMACHY instrument in the 2003–2005 time frame. Despite the lack of temporal overlap, seasonal averages in general agree well, with spatial correlations (r2) ranging from 0.62 in September through November to 0.83 in June through August. However, we observe higher variability in GOSAT δD, indicated by fitted slopes between 1.2 and 1.46. The discrepancies are likely related to differences in vertical sensitivities but warrant further validation of both GOSAT and SCIAMACHY and an extension of the validation dataset.
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Acquisition of isotopic composition for surface snow in East Antarctica and the links to climatic parameters
Alexandra Touzeau,Amaelle Landais,Barbara Stenni,Ryu Uemura,Kotaro Fukui,Shuji Fujita,Shuji Fujita,Sarah Guilbaud,Alexey A. Ekaykin,Alexey A. Ekaykin,Mathieu Casado,Eugeni Barkan,Boaz Luz,Olivier Magand,Grégory Teste,Emmanuel Le Meur,Mélanie Baroni,Joel Savarino,Ilann Bourgeois,Camille Risi +19 more
TL;DR: Touzeau et al. as mentioned in this paper studied the relationship between isotopes and temperature from a geographical point of view, using results from three traverses across Antarctica, to see how the relationship is built up through the distillation process.