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Accueil du site > Thèmes de recherche > Atmosphère & environnement > 2.4 Intercalibration d’instruments de mesure de terrain

2.4 Intercalibration d’instruments de mesure de terrain

2.4.1 Calibration of intrumentation for laboratory and field measurements
The indoor and outdoor ICARE atmospheric simulation chambers have been used within different research projects to intercalibrate instrumentations used both in laboratory studies and field measurements. The large indoor chamber equipped with in-situ FTIR was used along with the SPIRIT instrument (SPectromètre Infra-Rouge In situ Troposphérique) developed by LPC2E to determine the absolute intensity of the 2912.09 cm-1 line in order to derive reliable atmospheric HCHO concentrations using SPIRALE (SPectroscopie Infra-Rouge par Absorption de Laser Embarqué). The same chamber was used to calibrate the SAMU instrument (Spectromètre de masse Aéroporté MUlti-espèces par réactions ion-molécule, ACL 91) of Laboratoire ATmosphères, Milieux, Observations Spatiales (LATMOS), for in-situ atmospheric measurements of OH and total peroxy (HO2 + organic peroxy) radicals. On the other hand, the recently developed outdoor chamber was used to calibrate the NITROMAC instrument of the Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA-Créteil) for HONO measurements.

2.4.2 Field measurements of key atmospheric species (HONO, HCHO, VOCs, peroxy radicals)
The peroxy radical chemical amplification (PERCA) instrument of ICARE has been employed in a field campaign aimed at studies of radical chemistry in polluted environment influenced by urban outflow within a project supported by LEFE/INSU programme. The measurements were performed during June-July 2007 on the agricultural site of Grignon situated 20 km to the west of Paris. Two other campaigns were conducted recently (2009 and 2010) in the same site within the PHOTONA project (CNRS-DFG programme) to measure HONO, O3 and NOx. Within a collaborative project between ICARE, Fudan university and CAS, an intensive field measurement study was conducted at a site at the Fudan University (Shanghai) during October 2009. Ambient air pollutants measured included HONO, NO, NO2, O3, carbonyls. The purpose is to improve our understanding of the local air pollution in Shanghai in order to plan future campaigns for understanding the interplay among local and regional air pollutants in the Shanghai area, and the influence of regional transport on local air pollutants.