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Description

The GPM Ground Validation Autonomous Parsivel Unit (APU) OLYMPEX dataset was collected during the OLYMPEX field campaign held at Washington's Olympic Peninsula during the intense observation period of November 2015 to the end of January 2016. The dataset consists of data collected by 16 APUs. The APU is an optical laser-disdrometer based on single particle extinction that measures particle size and fall velocity. It consists of the Parsivel2 developed by OTT in Germany and supporting hardware developed by University of Alabama. This APU dataset provides precipitation data including precipitation amount, precipitation rate, reflectivity in Rayleigh regime, liquid water content, drop diameter, and drop concentration. Data are available in ASCII format.

Product Summary

Platforms
GROUND STATIONS
Instruments
APU
Spatial Extent

N: 48.3871 S: 47.2025 E: -123.478 W: -124.369

Location
WASHINGTON
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-01-10 to 2016-01-31
Data Partner
Global Hydrometeorology Resource Center, Marshall Space Flight Center, NASA (NASA/MSFC/GHRC)
Concept ID
C1979128148-GHRC_DAAC
Data State
COMPLETE
Number of Files/Granules
100
Processing Level
3
Published
Updated
Science Keywords
Droplet Size ,
Precipitation Rate ,
Precipitation Amount ,
Hydrometeors ,
Liquid Precipitation ,
Drizzle ,
Rain ,
Liquid Water Equivalent ,
Precipitation Anomalies ,
Snow Water Equivalent ,
Solid Precipitation ,
Total Surface Precipitation Rate

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Walter Petersen, A. T. (2025). GPM Ground Validation Autonomous Parsivel Unit (APU) OLYMPEX [Data set]. NASA Global Hydrometeorology Resource Center Distributed Active Archive Center. https://doi.org/10.5067/GPMGV/OLYMPEX/APU/DATA301 Date Accessed: 2026-05-13

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Multiscale interactions contributing to enhanced orographic precipitation in landfalling frontal systems over the Olympic peninsula Dolan, Brenda, Rutledge, Steven A., Rasmussen, Kristen L. Cloud Liquid Water/Ice, Cloud Droplet Concentration/Size, Particle Size Distribution, Cloud Microphysics, Water Vapor Indices, SPECTRUM WIDTH, Total Precipitable Water, Radar Reflectivity, Doppler Velocity, Precipitation Rate, Droplet Size, Precipitation Amount, Hydrometeors, Liquid Precipitation, Drizzle, Rain, Liquid Water Equivalent, Precipitation Anomalies, Snow Water Equivalent, Solid Precipitation, Total Surface Precipitation Rate, Airspeed/Ground Speed, Flight Data Logs, Attitude Characteristics, Flight Level Winds
Orographically Modified Ice-Phase Precipitation Processes during the Olympic Mountains Experiment (OLYMPEX) DeLaFrance, Andrew, McMurdie, Lynn, Rowe, Angela Cloud Microphysics, Cloud Liquid Water/Ice, Cloud Droplet Concentration/Size, Particle Size Distribution, Water Vapor Indices, SPECTRUM WIDTH, Total Precipitable Water, Radar Reflectivity, Doppler Velocity, Precipitation Rate, Precipitation Amount, Droplet Size, Hydrometeors, Liquid Precipitation, Drizzle, Rain, Liquid Water Equivalent, Precipitation Anomalies, Snow Water Equivalent, Solid Precipitation, Total Surface Precipitation Rate, Atmospheric Pressure Measurements, Dew Point Temperature, Relative Humidity, Horizontal Wind Velocity/Speed, Vertical Wind Velocity/Speed, Wind Direction, Geopotential Height, Wind Speed
Dual-polarization radar retrievals of coastal pacific northwest raindrop size distribution parameters using random forest regression Conrick, Robert, Zagrodnik, Joseph P., Mass, Clifford F. SPECTRUM WIDTH, Total Precipitable Water, Radar Reflectivity, Doppler Velocity, Precipitation Rate, Droplet Size, Precipitation Amount, Hydrometeors, Liquid Precipitation, Drizzle, Rain, Liquid Water Equivalent, Precipitation Anomalies, Snow Water Equivalent, Solid Precipitation, Total Surface Precipitation Rate, Particle Size Distribution
Evaluating warm and cold rain processes in cloud microphysical schemes using OLYMPEX field measurements Naeger, Aaron R., Colle, Brian A., Zhou, Na, Molthan, Andrew SPECTRUM WIDTH, Total Precipitable Water, Radar Reflectivity, Doppler Velocity, Precipitation Rate, Droplet Size, Precipitation Amount, Hydrometeors, Liquid Precipitation, Drizzle, Rain, Liquid Water Equivalent, Precipitation Anomalies, Snow Water Equivalent, Solid Precipitation, Total Surface Precipitation Rate, Atmospheric Pressure Measurements, Dew Point Temperature, Relative Humidity, Horizontal Wind Velocity/Speed, Vertical Wind Velocity/Speed, Wind Direction, Geopotential Height, Wind Speed, Cloud Microphysics, Cloud Liquid Water/Ice, Cloud Droplet Concentration/Size, Particle Size Distribution, Water Vapor Indices
An evaluation of simulated precipitation characteristics during OLYMPEX Conrick, Robert, Mass, Clifford F. Precipitation Amount, Precipitation Rate, Droplet Size, Hydrometeors, Liquid Precipitation, Drizzle, Rain, Liquid Water Equivalent, Precipitation Anomalies, Snow Water Equivalent, Solid Precipitation, Total Surface Precipitation Rate
Vertical structure and microphysical characteristics of frontal systems passing over a three-dimensional coastal mountain range Zagrodnik, Joseph P., McMurdie, Lynn A., Houze, Robert A., Tanelli, Simone Precipitation Amount, Precipitation Rate, Droplet Size, Hydrometeors, Liquid Precipitation, Drizzle, Rain, Liquid Water Equivalent, Precipitation Anomalies, Snow Water Equivalent, Solid Precipitation, Total Surface Precipitation Rate, Doppler Velocity, Radar Reflectivity
Evaluation of X-Band dual-polarization radar-rainfall estimates from OLYMPEX Derin, Yagmur, Anagnostou, Emmanouil, Anagnostou, Marios, Kalogiros, John Precipitation Amount, Precipitation Rate, Droplet Size, Hydrometeors, Liquid Precipitation, Drizzle, Rain, Liquid Water Equivalent, Precipitation Anomalies, Snow Water Equivalent, Solid Precipitation, Total Surface Precipitation Rate, Radar Reflectivity, Doppler Velocity
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