Synopsis: Terrestrial ecosystems play an important role in climate change mitigation. In Southern California there is a high diversity of natural systems, including chaparral, coastal sage scrub, coastal salt marshes, grasslands, and woodlands. It is crucial to clarify if these ecosystems act as CO2 sources or sinks, and how CO2 fluxes have changed throughout time in Southern California for adequate future management. The objective of this internship is to engage graduate studies in CO2 flux data in Southern California natural landscapes in support of NOAA missions