1. Atmospheric and Oceanic Sciences; Princeton University; Princeton; New Jersey; USA
2. Carbon Dioxide Information Analysis Center; Oak Ridge National Laboratory; Oak Ridge; Tennessee; USA
3. Pacific Marine Environmental Laboratory; NOAA; Seattle; Washington; USA
4. School of Environmental Science and Engineering; Pohang University of Science and Technology; Pohang; Republic of Korea
5. Atlantic Oceanographic and Meteorological Laboratory; NOAA; Miami; Florida; USA
6. Rosenstiel School of Marine and Atmospheric Sciences; University of Miami; Miami; Florida; USA