Chemical characteristics assigned to trajectory clusters during the MINOS campaign

[摘要] During the Mediterranean Intensive Oxidant Study (MINOS) in August 2001 atotal of 14 measurement flights were performed with the DLR Falcon jet aircraftfrom Heraklion, Crete. One objective of this campaign was to investigate therole of long-range transport of pollutants into the Mediterranean area. Ananalysis of 5-day back trajectories indicates that in the lower troposphere(0-4 km) air masses originated from eastern and western Europe, in the mid-troposphere(4-8 km) from the North Atlantic Ocean region and in the upper troposphere(8-14 km) from North Atlantic Ocean/North America (NANA) as well as South Asia. We allocatedall back trajectories to clusters based on their ending height and source region. The mixing ratios of ozone, nitrogen oxide, total reactive oxidizednitrogen (NO_y), formaldehyde, methanol, acetonitrile, acetone, peroxyacetylnitrate (PAN), carbon dioxide, carbon monoxide and methane measured along theflight tracks are examined in relation to the different cluster trajectories.In the lower troposphere the mean trace gas mixing ratios of the eastern Europecluster trajectories were significantly higher than those from western Europe.In the upper troposphere air from the NANA region seems to be influenced by thestratosphere, in addition, air masses were transported from South Asia, being influenced by strong convection in the Indianmonsoon.

[学科分类] 大气科学