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Observing ice clouds in the submillimeter spectral range: the CloudIce mission proposal for ESA's Earth Explorer 8

Authors :
Eric Defer
Susanne Crewell
Salomon Eliasson
Albin J. Gasiewski
C. Prigent
Jana Mendrok
F. Evans
Yasuko Kasai
Stefan A. Buehler
C. Jimenez
Clare Lee
Patrick Eriksson
Ralf Bennartz
National Observatory of Athens (NOA)
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA)
École normale supérieure - Paris (ENS Paris)
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP)
Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS)
Department of Radio and Space Science [Göteborg]
Chalmers University of Technology [Göteborg]
School of Geosciences [Edinburgh]
University of Edinburgh
Institut für Geophysik und Meteorologie [Köln]
Universität zu Köln
National Institute of Information and Communications Technology [Tokyo, Japan] (NICT)
École normale supérieure - Paris (ENS-PSL)
Universität zu Köln = University of Cologne
Source :
Atmospheric Measurement Techniques, Vol 5, Iss 7, Pp 1529-1549 (2012), Atmospheric Measurement Techniques Discussions, Atmospheric Measurement Techniques Discussions, Copernicus Publications / European Geosciences Union 2012, 5 (1), pp.1101-1151. ⟨10.5194/amtd-5-1101-2012⟩, Atmospheric Measurement Techniques Discussions, 2012, 5 (1), pp.1101-1151. ⟨10.5194/amtd-5-1101-2012⟩, Atmospheric Measurement Techniques, Atmospheric Measurement Techniques, European Geosciences Union, 2012, 5 (7), pp.1529-1549. ⟨10.5194/amt-5-1529-2012⟩, Atmospheric Measurement Techniques, 2012, 5 (7), pp.1529-1549. ⟨10.5194/amt-5-1529-2012⟩
Publication Year :
2012
Publisher :
Copernicus Publications, 2012.

Abstract

International audience; The disjunct eddy covariance (DEC) method is an interesting alternative to the conventional eddy covariance (EC) method because it allows the estimation of turbulent fluxes of species for which fast sensors are not available. We have developed and validated a new disjunct sampling system (called MEDEE). This system is built with chemically inert materials. Air samples are taken quickly and alternately in two cylindrical reservoirs, the internal pressures of which are regulated by a moving piston. The MEDEE system was designed to be operated either on the ground or aboard an aircraft. It is also compatible with most analysers since it transfers the air samples at a regulated pressure. To validate the system, DEC and EC measurements of CO 2 and latent heat fluxes were performed concurrently during a field campaign. EC fluxes were first compared to simulated DEC (SDEC) fluxes and then to actual DEC fluxes. Both the simulated and actual DEC fluxes showed a good agreement with EC fluxes in terms of correlation. The determination coefficients (R 2) were 0.93 and 0.91 for DEC and SDEC latent heat fluxes, respectively. For DEC and SDEC CO 2 fluxes R 2 was 0.69 in both cases. The conditions of low fluxes experienced during the campaign impaired the comparison of the different techniques especially for CO 2 flux measurements. Linear regression analysis showed an 14 % underestimation of DEC fluxes for both CO 2 and latent heat compared to EC fluxes. A first field campaign, focusing on biogenic volatile organic compound (BVOC) emissions, was carried out to measure isoprene fluxes above a downy oak (Quercus Pubescens) forest in the southeast of France. The measured standard emission rate was in the lower range of reported values in earlier studies. Further analysis will be conducted through ground-based and airborne campaigns in the coming years.

Details

Language :
English
ISSN :
18678548, 18671381, and 18678610
Volume :
5
Issue :
7
Database :
OpenAIRE
Journal :
Atmospheric Measurement Techniques
Accession number :
edsair.doi.dedup.....24c9276e2191864cc4f5af3a0aeda243
Full Text :
https://doi.org/10.5194/amtd-5-1101-2012⟩