Brisbane CO2 for 14 June 2023

A big fall in levels during the course of Wednesday in Phase 2 data (see explanation here).  How do ground level CO2 concentrations differ across the day compared to well-mixed air at higher altitudes?  Today’s final graph shows concentrations (blue – lower, red – higher) across the day, with the y-axis running from ground level to 400 m, from a large study in Vancouver.  Notice that at higher altitudes there is less variation across the day (all shades of blue), while at ground level (comparable to our sensors) and up to about 100 m, a large red patch emerges after dark and remains until sunrise.  This is the diurnal cycle apparent in our Brisbane data – lowest concentrations in the mid-afternoon – highest concentrations just before dawn.  Crawford, B., A. Christen, and I. McKendry. ‘Diurnal Course of Carbon Dioxide Mixing Ratios in the Urban Boundary Layer in Response to Surface Emissions’. Journal of Applied Meteorology and Climatology 55, no. 3 (1 March 2016): 507–29.

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

For reference, latest monthly average (Apr 2023) from CSIRO for Kennaook/Cape Grim in NW Tasmania was 415.4 ppm. (Note – these are provisional values, subject to revision folllowing sensor re-calibrations and other checks.)

DatePetrie TerraceChapel HillBellbird Park
14-Jun-2023435 ppm427 ppm436 ppm
13-Jun-2023441 ppm438 ppm440 ppm
12-Jun-2023442 ppm441 ppm446ppm
11-Jun-2023443 ppm443 ppm449 ppm
10-Jun-2023446 ppm434 ppm442 ppm
9-Jun-2023440 ppm430 ppm438 ppm
CO2 concentrations for Phase 2
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