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Space Observation of Carbon Dioxide Partial PressureWe have developed and validated a statistical model to estimate the partial pressure (or fugacity) of carbon dioxide at sea surface from space-based observations of sea surface temperature, chlorophyll, and salinity. More than a quarter million in situ measurements coincident with satellite data were compiled to train and validate the model. Details can be found in Liu and Xie (2014). The outputs are found to be sensitive to variability from intra-seasonal to inter-annual and from equatorial to high-latitude oceans. They can capture known phenomena, such as, annual spring bloom at high latitudes, inter-annual episode of El Nino, and westward propagation of tropical instability waves. The feasibility of using a single algorithm to map the partial pressure over global oceans for all seasons is demonstrated.
The figures show collocated pCO2s measurements with satellite observations during 2002-2010 (top), and bin-averaged pCO2s from model versus observed pCO2s (bottom). |