T
Tjarda Roberts
Researcher at University of Orléans
Publications - 46
Citations - 1002
Tjarda Roberts is an academic researcher from University of Orléans. The author has contributed to research in topics: Volcano & Plume. The author has an hindex of 17, co-authored 41 publications receiving 847 citations. Previous affiliations of Tjarda Roberts include Norwegian Polar Institute & University of Cambridge.
Papers
More filters
Journal ArticleDOI
LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 1: Principle of measurements and instrument evaluation
Jean-Baptiste Renard,François Dulac,Gwenaël Berthet,Thibaut Lurton,Damien Vignelles,Fabrice Jégou,Thierry Tonnelier,Matthieu Jeannot,Benoit Couté,Rony Akiki,Nicolas Verdier,Marc Mallet,François Gensdarmes,Patrick Charpentier,Samuel Mesmin,Vincent Duverger,Jean-Charles Dupont,Thierry Elias,Vincent Crenn,Jean Sciare,Paul Zieger,Matthew Salter,Tjarda Roberts,Jérôme Giacomoni,Matthieu Gobbi,Eric Hamonou,Haraldur Ólafsson,Haraldur Ólafsson,Pavla Dagsson-Waldhauserova,Claude Camy-Peyret,Christophe Mazel,Thierry Décamps,Martin Piringer,Jérémy Surcin,Daniel Daugeron +34 more
TL;DR: The Light Optical Aerosol Counter (LOAC) as mentioned in this paper is a light and compact optical particle/sizer counter, which is able to perform measurements not only at the surface but under all kinds of balloons in the troposphere and in the stratosphere.
Journal ArticleDOI
Modelling reactive halogen formation and ozone depletion in volcanic plumes
Tjarda Roberts,Christine F. Braban,R.S. Martin,Clive Oppenheimer,J. W. Adams,R. A. Cox,Roderic L. Jones,Paul T. Griffiths +7 more
TL;DR: In this paper, the authors present a model called PlumeChem to simulate the reactive halogen chemistry in plumes from persistently degassing volcanoes. But the model is not suitable for the simulation of large-scale plumes.
Journal ArticleDOI
LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 2: First results from balloon and unmanned aerial vehicle flights
Jean-Baptiste Renard,François Dulac,Gwenaël Berthet,Thibaut Lurton,Damien Vignelles,Fabrice Jégou,Thierry Tonnelier,Matthieu Jeannot,Benoit Couté,Rony Akiki,Nicolas Verdier,Marc Mallet,François Gensdarmes,Patrick Charpentier,Samuel Mesmin,Vincent Duverger,Jean-Charles Dupont,Thierry Elias,Vincent Crenn,Jean Sciare,Paul Zieger,Matthew Salter,Tjarda Roberts,Jérôme Giacomoni,Matthieu Gobbi,Eric Hamonou,Haraldur Ólafsson,Pavla Dagsson-Waldhauserova,Pavla Dagsson-Waldhauserova,C. Camy-Peyret,Christophe Mazel,Thierry Décamps,Martin Piringer,Jérémy Surcin,Daniel Daugeron +34 more
TL;DR: Renard et al. as discussed by the authors proposed a light optical particle counter/sizer (LOAC) based on scattering measurements at angles of 12 and 60 • that allows for some typology identification of particles (droplets, carbonaceous, salts, and mineral dust) in addition to size-segregated counting in a large diameter range from 0.2 µm up to possibly more than 100 µm depending on sampling conditions.
Journal ArticleDOI
Magma storage, transport and degassing during the 2008–10 summit eruption at Kīlauea Volcano, Hawai‘i
Marie Edmonds,I. Sides,Donald A. Swanson,Cynthia Werner,R.S. Martin,Tamsin A. Mather,Richard A. Herd,Roderic L. Jones,M. I. Mead,G. M. Sawyer,Tjarda Roberts,A.J. Sutton,Tamar Elias +12 more
TL;DR: In this article, the authors measured the sulfur dioxide (SO2) and CO2 (CO2) concentrations in the gas plume from Halema‘uma‘u using electrochemical and non-dispersive infrared sensors during April 2009.
Journal ArticleDOI
Rapid chemical evolution of tropospheric volcanic emissions from Redoubt Volcano, Alaska, based on observations of ozone and halogen-containing gases
Peter J. Kelly,Christoph Kern,Tjarda Roberts,Taryn Lopez,Cynthia Werner,Alessandro Aiuppa,Alessandro Aiuppa +6 more
TL;DR: In this paper, the authors report results from an observational and modeling study of reactive chemistry in the tropospheric plume emitted by Redoubt Volcano, Alaska, which includes the first observations of Br and I degassing from an Alaskan volcano, the first study of O 3 evolution in a volcanic plume, as well as the first detection of BrO in the plume of a passively degassing Alaska volcano.