Brisbane CO2 for 4 July 2023

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Much higher levels on Tuesday following several days of stronger, predominantly westerly winds.  All three sites averaged above the recent background level measured by CSIRO at Kennaook/Cape Grim from air streaming in from the Southern Ocean.  These differences were +33, +27 and +19 ppm for the CBD (Petrie Terrace), a middle suburb (Chapel Hill), and city edge (Bellbird Park), respectively. The build-up in carbon dioxide concentrations across the day – apparent in the first graph – may have resulted from the much lower wind speeds (9 and 6 km/h at 9 a.m. and 3 p.m. measured at Archerfield), conditions which allow emissions to accumulate.

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

For reference, latest monthly average (May 2023) from CSIRO for Kennaook/Cape Grim in NW Tasmania was 415.7 ppm. (Note – these are provisional values, subject to revision folllowing sensor re-calibrations and other checks.)

DatePetrie TerraceChapel HillBellbird Park
4-Jul-2023449 ppm443 ppm429 ppm
3-Jul-2023428 ppm429 ppm412 ppm
2-Jul-2023424 ppm425 ppm414 ppm
1-Jul-2023419 ppm407 ppm405 ppm
30-Jun-2023414 ppm405 ppm402 ppm
29-Jun-2023415 ppm409 ppm405 ppm
28-Jun-2023435 ppm427 ppm428 ppm
27-Jun-2023426 ppm409 ppm415 ppm
26-Jun-2023412 ppm402 ppm412 ppm
25-Jun-2023447 ppm426 ppm429 ppm
24-Jun-2023427 ppm417 ppm423 ppm
23-Jun-2023434 ppm427 ppm435 ppm
22-Jun-2023442 ppm425 ppm436 ppm
21-Jun-2023443 ppm421 ppm437 ppm
20-Jun-2023421 ppm414 ppm417 ppm
19-Jun-2023430 ppm418 ppm419 ppm
18-Jun-2023436 ppm426 ppm434 ppm
17-Jun-2023440 ppm429 ppm437 ppm
16-Jun-2023438 ppm421 ppm433 ppm
15-Jun-2023433 ppm412 ppm428 ppm
14-Jun-2023435 ppm425 ppm438 ppm
13-Jun-2023441 ppm436 ppm442 ppm
12-Jun-2023442 ppm439 ppm448ppm
11-Jun-2023443 ppm441 ppm451 ppm
10-Jun-2023446 ppm432 ppm4444 ppm
9-Jun-2023441 ppm428 ppm440ppm
CO2 concentrations for Phase 2
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