Travels interrupted posting for the last few days, but with time to carefully check all Python analysis code, the averages for the last 19 days are presented here without resorting to Excel. The tabulated data receives a minor revision between June 09 and June 18 (data for June 19 and subsequent dates is new today. The checks caught an inadvertent double application of calibration coefficients – making a very small difference to some data, in no case > 2ppm). Phase 2 data (see explanation here) has accumulated to the point where the average values in Fig 2 show a fairly clear pattern. The CBD concentrations are marginally higher than the others overall, but are notably higher in daylight hours, while the city edge data (Bellbird Park) has higher values at night, possibly because of higher night-time respiration from vegetation. The final image is of a meeting I had with final year PhD student Naomi Askow at U.C. Berkeley – Naomi is on Prof. Ron Cohen’s ‘Beaco2n’ project team – and generously shared some of her time explaining aspects of their more established project. On display is their sensor equipment which is the basis for their extensive Bay Area network. Many useful ideas came from this meeting.
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.)
| Date | Petrie Terrace | Chapel Hill | Bellbird Park |
| 27-Jun-2023 | 426 ppm | 409 ppm | 415 ppm |
| 26-Jun-2023 | 412 ppm | 402 ppm | 412 ppm |
| 25-Jun-2023 | 447 ppm | 426 ppm | 429 ppm |
| 24-Jun-2023 | 427 ppm | 417 ppm | 423 ppm |
| 23-Jun-2023 | 434 ppm | 427 ppm | 435 ppm |
| 22-Jun-2023 | 442 ppm | 425 ppm | 436 ppm |
| 21-Jun-2023 | 443 ppm | 421 ppm | 437 ppm |
| 20-Jun-2023 | 421 ppm | 414 ppm | 417 ppm |
| 19-Jun-2023 | 430 ppm | 418 ppm | 419 ppm |
| 18-Jun-2023 | 436 ppm | 426 ppm | 434 ppm |
| 17-Jun-2023 | 440 ppm | 429 ppm | 437 ppm |
| 16-Jun-2023 | 438 ppm | 421 ppm | 433 ppm |
| 15-Jun-2023 | 433 ppm | 412 ppm | 428 ppm |
| 14-Jun-2023 | 435 ppm | 425 ppm | 438 ppm |
| 13-Jun-2023 | 441 ppm | 436 ppm | 442 ppm |
| 12-Jun-2023 | 442 ppm | 439 ppm | 448ppm |
| 11-Jun-2023 | 443 ppm | 441 ppm | 451 ppm |
| 10-Jun-2023 | 446 ppm | 432 ppm | 4444 ppm |
| 9-Jun-2023 | 441 ppm | 428 ppm | 440ppm |