1. Deptment of Earth System Science University of California, Irvine Irvine CA USA
2. Department of Earth Sciences Syracuse University Syracuse NY USA
3. Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge MA USA
4. Cooperative Institute for Research in Environmental Sciences Boulder CO USA
5. NOAA Chemical Sciences Laboratory Boulder CO USA
6. Independent Researcher Ciudad Mante Mexico
7. Instituto de Geología Universidad Nacional Autónoma de México Ciudad Universitaria Ciudad de México México