Brisbane CO2 for 1 December 2023

Please see here for details about the calibration improvements made since Phase 2.   Notable on Friday were the very high early morning values at Bellbird Park – in excess of 550 ppm – which fell significantly before daybreak, suggesting they were not just the result of typical atmospheric boundary layer trapping of air, because this normally lifts only when the sun rises.  The evening storm front produced abrupt temperature, pressure and relative humidity changes, but with compensation for these improved in Phase 3 data, they did not show up in the CO2 data. 

Today’s second chart is from a very mathematical but intriguing study of how city area and city population interact in their emissions effects.  The authors show that U.S cities with large (>= 1 million)  populations, higher population density is  associated with lower emissions, while this is much less true for smaller population cities.  “Our results suggest that the densification of large populated urban areas is likely to have important contributions to the reduction of urban CO2 emissions.” 

Daily Averages – Phase 3

Daily Averages – Phase 2 (See explanation of differences between Phase 1 and Phase 2 data)

For reference, latest monthly average (July 2023) from CSIRO for Kennaook/Cape Grim in NW Tasmania was 416.6 ppm. (Note – these are provisional values, subject to revision folllowing sensor re-calibrations and other checks.)