WISPER
Water Isotope System for Precipitation and Entrainment Research

The Water Isotope System for Precipitation and Entrainment Research (WISPER) is an in situ airborne instrument used to measure condensed water content and water vapor. It consists of two inlets with the primary inlet being a counterflow virtual impactor (CVI) used to collect air samples. Picarro cavity ringdown laser spectrometers (CRDS) are used to measure condensed water and water vapor within the air samples. WISPER can also provide water vapor isotopic abundances. It has a typical sampling frequency of 1 second.