RT info:eu-repo/semantics/article
T1 Influence of air parcel trajectories on CO2 and CH4 concentrations in the northern plateau of the Iberian Peninsula
A1 Pérez Bartolomé, Isidro Alberto
A1 Sánchez Gómez, María Luisa
A1 García Pérez, María Ángeles
A1 Pardo Gómez, Nuria
K1 METEX
K1 South-western Europe
K1 Carbon dioxide
K1 Methane
AB This study presents a simpler procedure for grouping air parcel back trajectories than others previously applied. Two-day air parcel back trajectories reaching an unpolluted site in the centre of the northern plateau of the Iberian Peninsula were calculated over a three-year period using the METEX model. A procedure based on the kernel density calculation was applied to the direction of each trajectory centroid to determine groups of trajectories.This method is much faster than the cluster procedure when it comes to retaining the directional details of groups. Seasonal analysis of six groups of trajectories revealed that the Atlantic origin prevailed against displacement from northern Europe. Moreover, Mediterranean and particularly African trajectories were infrequent, probably due to the rough peninsular orography in these directions. The location of air trajectories reaching the study site was described using a surface classification below the air parcels with improved spatialresolution compared to previous analyses. Local contribution was very marked, particularly in summer. Mean trajectories were calculated for each group together with meteorological features and CO2 and CH4 concentrations. Groups may be identified by their mean temperature, wind speed, elevation and distance values. However, only two groups should be considered when analysing the two trace gases, one for trajectories from the AtlanticOcean and the second for trajectories from the continent. Contrasts of about 4 ppm for CO2 in summer and 0.023 ppm for CH4 in winter were observed, revealing that air trajectories from the Atlantic Ocean were cleaner than those arriving from the continent. These differences were attributed to higher air stagnation over land.
PB PERGAMON-ELSEVIER
SN 1364-6826
YR 2018
FD 2018
LK http://uvadoc.uva.es/handle/10324/32876
UL http://uvadoc.uva.es/handle/10324/32876
LA eng
NO Journal of Atmospheric and Solar-Terrestrial Physics, 2018 167 p. 58–65
DS UVaDOC
RD 26-abr-2024