During the MAPM campaign 50 ODINs where distributed throughout Christchurch.

At the beginning and end of the MAPM campaign all 50 ODINs were co-located on a scaffolding platform in Woolston, Christchurch, for inter-calibration. The ES-642 particulate matter sensors also participated in the colocation. After the colocation, the location of all sensors changed as they were distributed in the city. The colocation was repeated following the deployment period to assess temporal changes in instrument calibration. Thus, the MAPM particulate matter data are provided in three sub-categories, i.e.

  • Colocation_1: Measurements from the initial colocation which took seven days at the start of the MAPM campaign in June 2019.
  • Deployment: Measurements from the main MAPM campaign in which the sensors where distributed within Christchurch over the austral winter 2019.
  • Colocation_2: Measurements from the final colocation which took seven days at the end of the MAPM campaign in September 2019.

For the deployment period, a version 1 (v_01) and version 2 (v_02) of the data are provided in addition to the raw files. These use the two colocation periods to calibrate the instruments to minimise inter- and intra-instrument biases. A mMore in-depth description is provided in the readme files available alongside the netCDF files.