Access Ice-Nucleating Particle Data From MOSAiC Expedition

Published: 19 July 2021

The icebreaker R/V Polarstern sits in the ice floe during the MOSAiC expedition.
The Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition featured the first data capturing the annual cycle of ice-nucleating particles in the central Arctic.

In the Atmospheric Radiation Measurement (ARM) Data Center, two principal investigator data sets on ice-nucleating particles (INPs) are now available from the 2019–2020 Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition.

MOSAiC provided the first data capturing the annual cycle of INPs in the central Arctic.

Colorado State University researchers Jessie Creamean and Tom Hill, who also manage the ARM user facility’s efforts to collect and analyze INP samples, are responsible for the new MOSAiC INP data sets.

Creamean led an INP campaign during MOSAiC that generated a new data set of size-resolved INP concentrations. Researchers analyzed INPs collected with a rotating drum aerosol sampler on the icebreaker R/V Polarstern from October 23, 2019, to October 1, 2020. The samples were analyzed with a cold plate drop freezing technique.

The other new MOSAiC INP data set, generated by Hill and Kevin Barry, Creamean’s PhD student, provides INP concentration measurements of aerosol filter samples collected from October 27, 2019, to September 24, 2020, on the Polarstern. Researchers conducted the sample analysis using an ice spectrometer from Colorado State University.

Access the size-resolved INP concentrations and the ice spectrometer measurements from the ARM Data Center. (Go here to create an account to download the data).

The size-resolved campaign data set includes three files:

  • dumcp_inp_concentrations.csv – cumulative INP concentrations binned every 0.5 degrees Celsius from 0 to minus-30 C for all samples and size ranges processed via drop freezing assays using the Colorado State University cold plate
  • dumcp_inp_standard_deviation.csv – standard deviations for all samples and temperatures in dumcp_inp_concentrations.csv
  • dumcp_blank_concentrations_standard_deviation.csv INP concentrations and standard deviations for the deionized water and sample substrate blanks binned every 0.5 C from 0 to minus-30 C.

The ice spectrometer data are contained in ICARTT files within the ICARTT directory.

For more information, see the README files with each data set. Please contact Creamean and Hill with questions or comments about the data.

To cite the data, please use doi:10.5439/1798162 for the size-resolved concentrations and doi:10.5439/1804484 for the ice spectrometer measurements.

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ARM is a DOE Office of Science user facility operated by nine DOE national laboratories.