THE ARCTIC IS UNDERGOING DRASTIC CHANGE DUE TO WARMING AND RAPID LOSS OF SEA ICE BOTH OF WHICH AFFECT BIOGEOCHEMICAL CYCLES. SPECIFICALLY CO2 FLUXES BETWEEN THE SEA ICE AND ATMOSPHERE ARE POORLY UNDERSTOOD. THERE IS A NEED FOR SHORT TERM ARCTIC CO2 VARIABILITY TO BE STUDIED TO IMPROVE MODELING TECHNIQUES AND THE UNDERSTANDING OF SEA ICE-ATMOSPHERE INTERACTION. THIS PROJECT AIMS TO FIND THE PROCESSES CONTROLLING SEASONAL AND ANNUAL ARCTIC CO2 CONCENTRATIONS AND FLUXES AS WELL AS FINDING THE OVERALL IMPACT ON THE CARBON CYCLE REGIONALLY AND GLOBALLY. THIS PROJECT WILL MAKE USE OF AN ATMOSPHERIC TRANSPORT MODEL (GEOS-CHEM) TO INTERPRET NASA SATELLITE (OCO-2) NASA AIRCRAFT (CARVE) AND SURFACE (O-BUOY AND GLOBALVIEW-CO2) CO2 MEASUREMENTS. ANALYSIS OF SATELLITE AIRCRAFT AND SURFACE DATA WILL ALLOW FOR AN UNDERSTANDING OF CO2 VARIABILITY PRESENT WITHIN THE ENTIRE ATMOSPHERIC COLUMN THROUGHOUT THE ARCTIC. FORWARD AND INVERSE MODELING USING GEOS-CHEM WILL BE USED TO IMPROVE THE UNDERSTANDING OF THE PROCESSES CONTROLLING AIR-SEA CO2 FLUXES IN THE ARCTIC. THIS PROJECT ALIGNS WITH THE GOALS OF NASA S EARTH SCIENCE DIVISION TO PREDICT CHANGES IN EARTH S BIOGEOCHEMICAL CYCLES AND THE GLOBAL CARBON CYCLE (CARBON CYCLE AND ECOSYSTEMS) AND TO IMPROVE THE ABILITY TO PREDICT CLIMATE CHANGES BY BETTER UNDERSTANDING THE ROLES AND INTERACTIONS OF THE OCEAN ATMOSPHERE LAND AND ICE IN THE CLIMATE SYSTEM (CLIMATE VARIABILITY AND CHANGE). COMPLETION OF THIS PROJECT WILL PROVIDE A BETTER UNDERSTANDING OF THE CARBON CYCLE IN A CHANGING ARCTIC ENVIRONMENT.