20191112
16170200
1.0
North American Profile of ISO19115 2003
TRUE
Nitrogen dioxide (NO2) and nitrogen monoxide (NO) are referred to as nitrogen oxides (NOx). NOx is a pollutant of air quality and can be harmful effects on health and the environment. The most common source of NOx in the troposphere are combustion processes for example from fossil fuel and forest fires. The recently launched satellite-based TROPOspheric Monitoring Instrument (TROPOMI) from the European Space Agency can measure NO2 with excellent accuracy, coverage, and resolution. TROPOMI is a nadir-viewing (down-looking) spectrometer measuring reflected sunlight in the ultraviolet, visible, near-infrared, and shortwave infrared. From these solar spectra, the amount of various gases related to air quality and climate change can be estimated. The satellite is in a Sun-synchronous orbit with a daily local overpass time around 1:30pm. / Le dioxyde d’azote (NO2) et le monoxyde d’azote (NO) sont regroupés sous le nom d’oxydes d’azote (NOx). Les NOx sont des polluants atmosphériques qui nuisent à la santé et à l’environnement. Dans la troposphère, les NOx sont principalement produits par la combustion des carburants fossiles et les incendies de forêt, entre autres. L’instrument TROPOMI (TROPOspheric Monitoring Instrument), récemment lancé à bord d’un satellite de l’Agence spatiale européenne, mesure les concentrations de NO2 avec un excellent degré de précision, de couverture et de résolution. TROPOMI est un spectromètre à pointage nadiral (orienté vers le bas) qui mesure la lumière solaire réfléchie dans l’ultraviolet, le visible, le proche infrarouge et l’infrarouge à ondes courtes. À partir des spectres solaires ainsi produits, on peut quantifier les concentrations de divers gaz qui sont liés à la qualité de l’air et aux changements climatiques. Le satellite suit une orbite héliosynchrone avec passage quotidien au-dessus d’un point donné vers 13 h 30.
TROPOMI
NO2
nitrogen dioxide
satellite
pollution
air quality
atmospheric monitoring
remote sensing / TROPOMI
NO2
dioxyde d'azote
satellite
pollution
qualité de l’air
observation atmosphérique
télédétection
Tropospheric Nitrogen dioxide (NO2) Adjusted Air Mass Factor / Tropospheric Le dioxyde d’azote (NO2) facteur de masse d’air ajusté
Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada) / Licence du gouvernement ouvert - Canada (http://ouvert.canada.ca/fr/licence-du-gouvernement-ouv ert-canada)
Tropospheric Nitrogen dioxide (NO2) / Tropospheric Le dioxyde d’azote (NO2)
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