TagClimate(42)

© Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Contrail cirrus radiative forcing for future air traffic Lisa Bock and Ulrike Burkhardt Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany Correspondence: Lisa Bock (lisa.bock@dlr.de) Received: 14 December 2018 – Discussion started: 25 January 2019 Revised: 17 May 2019 – Accepted: 23 May 2019 – Published: 27 June 2019 Abstract. The climate impact of air traffic is to a large de- gree caused by changes in cirrus cloudiness resulting from the formation of contrails. Contrail cirrus radiative forcing is expected to increase significantly over time due to the large projected increases in air traffic. We use ECHAM5-CCMod, an atmospheric climate model with an online contrail cir- rus parameterization including a microphysical two-moment scheme, to investigate the climate impact of contrail cirrus for the year 2050. We take into account the predicted increase in air traffic volume, changes in propulsion efficiency and emissions, in particular soot emissions, and the modification of the contrail cirrus climate impact due to anthropogenic cli- mate change. Global contrail cirrus radiative forcing increases by a factor of 3 from 2006 to 2050, reaching 160 or even 180 mW m−2, which is the result of the increase in air traffic volume and a slight shift in air traffic towards higher alti- tudes. Large increases in contrail cirrus radiative forcing are expected over all of the main air traffic areas, but relative increases are largest over main air…

How corporate interests influence global climate policy at the UN agency for aviation October 2022 Table of Contents Executive Summary 3 Glossary 5 Background 6 Governance and Transparency on Climate at ICAO 9 Industry Representation at ICAO 15 Climate Policy and Industry Influence at ICAO 17 Appendices 31 It is noted that logos of industry associations and the UN International Civil Aviation Organization are occasionally utilized in the graphics associated with the analysis in this report, as is common practice in public facing releases of this kind. This in no way implies agreement and/or endorsement by the entities concerned with the report’s content. CORPORATE CAPTURE AND THE UN INTERNATIONAL CIVIL AVIATION ORGANIZATION OCTOBER 2022 PAGE 2 Table 1: Comparing transparency and industry influence over UN climate negotiations Graph comparing transparency rules and practices and industry influence at ICAO with other key UN climate negotiation bodies: the United Nations Framework Convention on Climate Change (UNFCCC) and International Maritime Organization (IMO). INTERNATIONAL CIVIL AVIATION ORGANIZATION (ICAO) AVIATION NO NO NO NO NO NO NO PARTLY NO 31% INTERNATIONAL MARITIME ORGANIZATION (IMO) SHIPPING NO NO PARTLY YES PARTLY YES PARTLY PARTLY YES 25% UN CLIMATE GOVERNANCE BODY CAN ALL DELEGATES PARTICIPATE IN CLIMATE NEGOTIATIONS WITHOUT SIGNING NON-DISCLOSURE AGREEMENTS? ARE DELEGATES PERMITTED TO SHARE CLIMATE NEGOTIATION DETAILS WITH EXTERNAL GROUPS SUCH AS THE MEDIA? SECTORS COVERED BY UN BODY ARE INDUSTRY ASSOCIATIONS EXCLUDED FROM CLIMATE NEGOTIATIONS? ARE CORPORATIONS EXCLUDED FROM STATE DELEGATIONS DURING CLIMATE NEGOTIATIONS? ARE ALL KEY CLIMATE NEGOTIATION DOCUMENTS AND REPORTS MADE…