OTT Pluvio²L in use for a research project in Antarctica
Close to McMurdo Station in Antarctica, researchers from the University of Colorado, Boulder and the National Center for Atmospheric Research are investigating methods to measure the accumulating snowfall in the harsh Antarctic environment. These measurements are important to better understand the potential for sea level rise in the future due to climate change. Measuring snowfall in the Antarctic environment is particularly challenging because it's difficult to distinguish between falling snow and blowing snow. The researchers, funded by the National Science Foundation, which is responsible for the U.S. Antarctic Program, are meeting this challenge through the use of a special-designed APS (Antarctic Precipitation System).
Read MTI article about precipitation measurements
OTT Pluvio² L – Weighing Rain Gauge
All-weather, high accuracy rain gauge for continuous data collection
The OTT Pluvio² L is an all-weather precipitation gauge that uses superior weight-based technology to measure the amount and intensity of rain, snow, and hail.
- Cumulative precipitation, precipitation intensity, bucket content in real time and non real time
- Weighing principle
- All-weather precipitation gauge without moving parts according to WMO guide line No. 8
- SDI-12 / RS-485, pulse
OTT Parsivel² - Laser Weather Sensor
Laser precipitation disdrometer measuring all precipitation types
The OTT Parsivel² is a modern laser disdrometer for comprehensive measurement of all precipitation types. The Parsivel² captures both the size and speed of falling particles, classifying them into one of 32 separate size and velocity classes.
- Precipitation type, intensity, drop size distribution, radar reflectivity
- Laser optical
- Simultaneous measurement of 32 classes for particle sizes and velocities
- SDI-12 / RS-485, pulse
"We want to demonstrate that we now have the capability to measure the really small amounts of snow that accumulate from event to event in the Antarctic environment" explained Scott Landolt, Associate Scientist with the National Center for Atmospheric Research. To help achieve the research objectives, the team has deployed snowfall collection instruments including a particle size measurement sensor and an elevated (~ 3.5 meters above the ground) and wind screen-protected OTT Pluvio² precipitation gauge. The height of the precipitation gauge above ground helps it to avoid measuring some of the blowing snow and the wind screen to slow the wind and help improve the snowfall collection capabilities of the gauge. The sensor suite also includes additional weather measurements including temperature, wind speed, and accumulating snow height. A day and night webcam is used to monitor the sensors. A nearby Antarctic Weather Station (AWS) from the University of Wisconsin-Madison serves as a backup for some of these measurements.
In total, four APS sensor suites are now deployed, which will run for two years: One at Williams Airfield and one at Phoenix Airfield near McMurdo Station, one at the "Lorne" AWS site 50 miles Southeast of McMurdo on the Ross Ice Shelf and one at "Tall Tower", which could soon become the most important US meteorological observatory in Antarctica and lies about 100 miles southeast of McMurdo Station.