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An Improved Raindrop Chemistry Spectrometer

Stuart G. BradleyDepartment of Physics and Department of Chemistry, University of Auckland, Auckland, New Zealand

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Stephen J. AdamsDepartment of Physics and Department of Chemistry, University of Auckland, Auckland, New Zealand

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C. David StowDepartment of Physics and Department of Chemistry, University of Auckland, Auckland, New Zealand

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Stephen J. de MoraDepartment of Physics and Department of Chemistry, University of Auckland, Auckland, New Zealand

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Abstract

A spectrometer allowing size-fractional chemical analysis of raindrops has been described previously by the authors. Modifications to this raindrop chemistry spectrometer now allow improved performance in windy conditions. Instrument verifications show that drop-size distribution parameters can be estimated to 2%, and pH versus drop-size spectra can be obtained to 0.02 pH units in wind speeds up to 3 m s−1. Improved resolution will allow trace chemical analysis for comparison with detailed rain chemistry models.

Abstract

A spectrometer allowing size-fractional chemical analysis of raindrops has been described previously by the authors. Modifications to this raindrop chemistry spectrometer now allow improved performance in windy conditions. Instrument verifications show that drop-size distribution parameters can be estimated to 2%, and pH versus drop-size spectra can be obtained to 0.02 pH units in wind speeds up to 3 m s−1. Improved resolution will allow trace chemical analysis for comparison with detailed rain chemistry models.

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