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Observing ice clouds in the submillimeter spectral range: the CloudIce mission proposal for ESA's Earth Explorer 8
- 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.
- Subjects :
- Atmospheric Science
Space technology
010504 meteorology & atmospheric sciences
Computer science
0211 other engineering and technologies
Cloud computing
02 engineering and technology
01 natural sciences
law.invention
law
Range (aeronautics)
Radiative transfer
Radar
lcsh:TA170-171
ComputingMilieux_MISCELLANEOUS
Remote sensing
021101 geological & geomatics engineering
0105 earth and related environmental sciences
[PHYS]Physics [physics]
Microwave sounding unit
business.industry
lcsh:TA715-787
lcsh:Earthwork. Foundations
Ranging
lcsh:Environmental engineering
13. Climate action
Millimeter
business
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Subjects
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⟩