− The variability of the molar fraction of atmospheric CO2 (xCO2 ) and wind speed and direction were investigated in a coastal embayment located in the west European coast, ría de Vigo, NW Spain, along daily and seasonal time scales. Observations in the ría showed that xCO2 a on a short time scale presented a much wider variability than seawater molar fraction (xCO2 ), in addition, a significan...

Satellite measurements are often compared with higher-precision ground-based measurements as part of validation efforts. The satellite soundings are rarely perfectly coincident in space and time with the ground-based measurements, so a colocation methodology is needed to aggregate “nearby” soundings into what the instrument would have seen at the location and time of interest. We are particular...

We assess the large-scale, top-down constraints on regional fossil fuel emissions provided by observations of atmospheric total column CO2, XCO2 . Using an atmospheric general circulation model (GCM) with underlying fossil emissions, we determine the influence of regional fossil fuel emissions on global XCO2 fields. We quantify the regional contrasts between source and upwind regions and probe ...

Consistent and accurate long-term data sets of global atmospheric concentrations of carbon dioxide (CO2) are required for carbon cycle and climate-related research. However, global data sets based on satellite observations may suffer from inconsistencies originating from the use of products derived from different satellites as needed to cover a long enough time period. One reason for inconsiste...

As discussed in Sect. 3.2, it was difficult to compare GOSAT XCO2 with aircraft measurement data at some observation sites where there was a paucity of flight data on the day when GOSAT was scheduled to overpass. However, the temporal interpolation of aircraft-based XCO2 by a curve fitting method enables temporally matched cases to be obtained for all observation sites of CONTRAIL, NOAA, DOE, a...

This paper presents the comparison of two CO2 datasets from the National Institute for Environmental Studies (NIES) of Japan and the Atmospheric CO2 Observations from Space (ACOS) of NASA for three years (2010 to 2012). Both CO2 datasets are retrieved from the Greenhouse gases Observing SATellite (GOSAT) short-wavelength infrared spectra over High gain surface land. In this three-year period, t...