Analysis of the sensitivity of atmospheric measurements at the JRC Ispra Atmosphere - Biosphere - Climate Integrated monitoring Station
The sensitivity of atmospheric measurements at the JRC Ispra Atmosphere - Biosphere - Climate Integrated monitoring Station to emissions on different spatial scales is analysed using the Lagrangian particle dispersion model FLEXPART, driven by meteorological fields from the nested COSMO-2 / COSMO-7 numerical weather prediction system at a horizontal resolution of 2 km / 7 km, respectively. The sensitivity of the atmospheric signal shows significant variations on diurnal, synoptic and seasonal scales. During night, the sensitivity is usually dominated by the area 40-60 km around the station, while daytime footprints are much larger, typically dominated by the area at distances of more than 60 km. During summer daytime, the radius s50 (at which the cumulative surface sensitivity reaches 50% of the total sensitivity) is about 187 km on average. Furthermore, a clear diurnal cycle in local wind direction is visible due to a regional mountain - lake/valley wind system, leading to a significant diurnal cycle of the sensitivity (north-west vs. south-east), especially during summer time.
Our analysis shows that the future sampling at the Ispra tall tower 100m above ground significantly reduces the impact of local emissions (~3-10 km around the station) compared to the previously used sampling height of 15m above ground.
BERGAMASCHI Peter;
BRUNNER Dominik;
2015-03-11
Publications Office of the European Union
JRC94909
978-92-79-46164-4,
1831-9424,
EUR 27131,
OP LB-NA-27131-EN-N,
https://publications.jrc.ec.europa.eu/repository/handle/JRC94909,
10.2788/234440,
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