THIS PROPOSAL SOLICITS $30 000 FROM ACMAP TO CONTRIBUTE TRAVEL FUNDS FOR THE 9TH INTERNATIONAL GEOS-CHEM MEETING (IGC8) TO BE HELD AT HARVARD ON MAY 6-9 2019. GEOS-CHEM IS AN OPEN-SOURCE GLOBAL MODEL OF ATMOSPHERIC COMPOSITION USED BY OVER 150 RESEARCH GROUPS IN 29 COUNTRIES. IT IS CENTRALLY MANAGED AT HARVARD WITH SUPPORT FROM ACMAP. IT SERVES NASA S MISSION BY PROVIDING A STATE-OF- THE-SCIENCE PLATFORM FOR A BROAD INTERNATIONAL COMMUNITY TO IMPROVE KNOWLEDGE OF ATMOSPHERIC COMPOSITION IN PARTICULAR THROUGH THE USE AND INTERPRETATION OF NASA SATELLITE DATA. GEOS-CHEM ALSO SERVES AS ATMOSPHERIC CHEMISTRY MODULE FOR THE NASA GEOS EARTH SYSTEM MODEL (GEOS-5) OF THE GODDARD MODELING AND ASSIMILATION OFFICE (GMAO). FUNDS FROM THIS PROPOSAL WILL BE FULLY DISBURSED TO PROVIDE PARTIAL TRAVEL SUPPORT FOR PRESENTERS AT IGC9. THIS WILL ENCOURAGE THE PARTICIPATION OF EARLY-CAREER SCIENTISTS WHO PLAY A CRITICAL ROLE IN MODEL DEVELOPMENT AND FOR WHICH GEOS-CHEM MEETINGS ARE OF PARTICULAR VALUE. A GENERAL OUTCOME OF THE MEETING WILL BE INCREASED EFFICIENCY OF GEOS-CHEM INVESTIGATORS TO EXPLOIT NASA DATA AND CONTRIBUTE TO NASA MODELS. SPECIFIC OUTCOMES WILL INCLUDE (1) A PRIORITIZED COMPILATION OF MODEL DEVELOPMENT PRIORITIES FOR THE NEXT TWO YEARS TO SERVE AS BLUEPRINT FOR THE GEOS-CHEM SUPPORT TEAM (2) NEW FOCI AND INITIATIVES FOR THE GEOS-CHEM WORKING GROUPS. ALL IGC9 PRESENTATIONS WILL BE POSTED ON AN OPEN-ACCESS WEBSITE.