Science Preparations for the Orbiting Carbon Observatory - 2 (OCO-2) Launch

The Orbiting Carbon Observatory-2 (OCO-2) is the first NASA satellite designed to collect the measurements needed measure atmospheric CO2 with the precision, resolution, and coverage needed to identify and quantify atmospheric sources and sinks on regional scales over the globe. OCO-2 is currently scheduled to launch from Vandenberg Air Force Base at 3 AM 1 July 2014. After a series of maneuvers, OCO-2 will be inserted at the head of the 705-km Afternoon Constellation (A-Train), about 6 minutes ahead of the GCOM-W1 satellite. OCO-2 will fly along a ground track that is displaced 217.3 km to the east of the World Reference System-2 (WRS-2) track followed by the NASA Aqua platform, such that it overflies the ground footprints of the CloudSat radar and the CALIPSO lidar. The OCO-2 spacecraft carries a single instrument that incorporates three, high-resolution, imaging spectrometers designed to measure the absorption of reflected sunlight by CO2 and O2. This instrument will collect about 1,000,000 soundings over the sunlit hemisphere each day. Rigorous instrument characterization has been completed to verify that it will meet requirements for sensitivity, with a high signal to noise ratio, large dynamic range, over a small sounding footprint (< 3 km2) that will enable OCO-2 to determine CO2 concentrations at regional scales with better that 1 ppm uncertainty. These capabilities have been incorporated into the main data processing and retrieval software for testing. This paper will describe pre-launch plans for testing both based on simulations and with the continuing data stream from the Japanese GOSAT instrument. We describe post-launch plans to further down-select the 1,000,000 soundings to those for immediate processing, user help in data quality assessment, and the schedule for data release to the science community.