CCNC supersaturation interpolation

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Method synopsis

Three-step process to harmonize cloud condensation nuclei measurements across different instrument supersaturation settings using polynomial interpolation to standard values.

Synthesized from method descriptions across 3 papers using this protocol.

Procedure as described in the canonical source

Steps below were extracted from the paper that introduces this protocol — Harmonized aerosol size distribution, cloud condensation nuclei, chemistry and optical properties at 10 sites (2025), Scientific Data. Implementations in other papers (listed below) may differ.

1. CCNC data interpolation
   Performed three-step harmonization process: (1) calculated mean NCCN and SSout for each SSsetpoint scan; (2) derived polynomial fit coefficients relating NCCN to supersaturation; (3) interpolated NCCN values to standard SS values (0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%). Applied 20% outlier threshold for quality control.
   Quantities: 6 standard supersaturation values, 20% outlier thresholdDuration: Applied to each individual SS scan across all CCNC datasetsConditions: Instrument SSsetpoint ranges varied by site, requiring interpolation to common values
   Equipment: DMT CCNC, DMT100, DMT200

Typical Equipment

• DMT CCNC

Output Measurements

• CCN concentrations at standard supersaturations

Papers Using This Protocol (3)

Species Studied With This Protocol

Places Where Used