Lightning NO x influence on large-scale NO y and O 3 plumes observed over the northern mid-latitudes

• Published in: Tellus B: Chemical and Physical Meteorology
• Main Authors: Gressent, Alicia, Sauvage, Bastien, Defer, Eric, Pätz, Hans Werner, Thomas, Karin, Holle, Ronald, Cammas, Jean-Pierre, Nédélec, Philippe, Boulanger, Damien, Thouret, Valérie, Volz-Thomas, Andreas
• Other Authors: Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Météo-France
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2014
• Subjects: [SDU]Sciences of the Universe [physics]; North Atlantic
• Online Access: https://hal.science/hal-04118176; https://hal.science/hal-04118176/document; https://hal.science/hal-04118176/file/254-1-4316-1-10-20221101.pdf; https://doi.org/10.3402/tellusb.v66.25544

International audience This paper describes the NO y plumes originating from lightning emissions based on 4 yr (2001-2005) of MOZAIC measurements in the upper troposphere of the northern mid-latitudes, together with ground- and space-based observations of lightning flashes and clouds. This analysis is primarily for the North Atlantic region where the MOZAIC flights are the most frequent and for which the measurements are well representative in space and time. The study investigates the influence of lightning NO x (LNO x ) emissions on large-scale (300-2000 km) plumes (LSPs) of NO y . One hundred and twenty seven LSPs (6% of the total MOZAIC NO y dataset) have been attributed to LNO x emissions. Most of these LSPs were recorded over North America and the Atlantic mainly in spring and summer during the maximum lightning activity occurrence. The majority of the LSPs (74%) is related to warm conveyor belts and extra-tropical cyclones originating from North America and entering the intercontinental transport pathway between North America and Europe, leading to a negative (positive) west to east NO y (O 3 ) zonal gradient with -0.4 (+18) ppbv difference during spring and -0.6 (+14) ppbv difference in summer. The NO y zonal gradient can correspond to the mixing of the plume with the background air. On the other hand, the O 3 gradient is associated with both mixing of background air and with photochemical production during transport. Such transatlantic LSPs may have a potential impact on the European pollution. The remaining sampled LSPs are related to mesoscale convection over Western Europe and the Mediterranean Sea (18%) and to tropical convection (8%).