NASA Mission to Study Ice Clouds, Help Observe Our Dynamic Atmosphere NASA has selected a new mission to help humanity better understand Earth’s dynamic atmosphere - specifically, ice clouds that form at high altitudes throughout tropical and sub-tropical regions. The PolSIR instrument - short for Polarized Submillimeter Ice-cloud Radiometer - will study such ice clouds to determine how and why they change throughout http://www.nasa.gov/press-release/nasa-mission-to-study-ice-clouds-help-observe-our-dynamic-atmosphere