OLYMPEX The Olympic Mountain Experiment

The Olympic Mountains Experiment (OLYMPEX) is a ground validation field campaign designed to verify and validate satellite measurement of precipitation from the constellation of satellites known as the Global Precipitation Measurement (GPM). The primary goal of OLYMPEX is to validate rain and snow measurements in midlatitude frontal systems moving from ocean to coast to mountains and to determine how remotely sensed measurements of precipitation by GPM can be applied to a range of hydrologic, weather forecasting and climate data. OLYMPEX will have a wide variety of ground instrumentation, and several radars and aircraft monitoring oceanic storm systems as they approach and traverse the Peninsula and the Olympic Mountains. The intensive observing period will be from November 2015 through February 2016.


The snowfall measurement campaign, took place during AMF2 deployment in Finland, focusing on understanding snowfall microphysics and characterizing performance of surface based snowfall measurement instruments. This was achieved by combining triple frequency (X, Ka, W -band) radar observations of vertical structure of the precipitation, microwave radiometer observations of LWP, lidar measurements of supercooled water layers with surface based observations of snowfall rate and particle size distributions. To facilitate accurate surface measurements of snowfall properties a double fence inter-comparison reference wind protection for the weighing precipitation gauge and 2D-video disdrometer was build on site. Due to the duplication of some of instruments, namely 2D-video and weighing gauge, we were able to characterize their measurement errors as a function of wind speed thus aiming at providing a correction procedure for the other ARM sites.