Description
The Water Isotope System for Precipitation and Entrainment Research (WISPER) is a counterflow virtual impactor on the NASA P-3 aircraft. WISPER uses a modified commercial Picarro L2120-i δD/δ18O ultra-High-Precision Isotopic Water Analyzer to make in-situ measurements of condensed water contents and water vapor in clouds, along with water vapor isotopic abundances (Henze et al., 2020; Henze and Noone, 2017). The measurement technique is cavity ring-down (CRD) spectroscopy (O'Keefe and Deacon, 1988; Berden et al., 2000; Gupta et al., 2009).
WISPER has been deployed to the NASA ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) and IMPACTS (Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms) field campaigns.