Radiosonde atmospheric profiles in Baffin Bay and the Northwest Passage, 2016
Ship: CCGS Amundsen CA
Principal Investigator: Barber, David
Start Date: 29-08-2016
End Date: 28-09-2016
Citation: Barber, D., Thériault, N. and Candlish, L. (2017) Radiosonde atmospheric profiles in Baffin Bay and the Northwest Passage, 2016. Waterloo, Canada: Canadian Cryospheric Information Network (CCIN). ArcticNet 2016, Centre for Earth Observation Science, University of Manitoba. Unpublished Data
Abstract: Data are transmitted at a rate of one message per second via VHF radio (~400.00MHz). Each data message reports a value for pressure, temperature and humidity data (raw PTU data). GPS strings are also transmitted and are used to calculate upper-level wind speed and direction. All radiosonde data files are exported as a raw time series which will require quality assurance and post-processing. Before launch, the radiosonde's temperature, pressure and humidity sensors are calibrated using the Vaisala ground station calibration unit. Surface meteorological observations are also noted and recorded for each launch. Starting meteorological conditions are input into the sounding including: sea level pressure, air temperature, relative humidity, and wind speed and direction. Radiosondes were launched twice a day at 0000 UTC and 1200 UTC during leg 3a and 3b of the Amundsen cruise 2016, except when winds were stronger than 25 knots Balloon launches carrying the radiosonde instrumentation were made at least once per day to provide continuous physical sampling of the troposphere. Balloon launches were also used to profile low-pressure systems, cyclones, and periods of significant warm or cold-air advection aloft. Radiosonde data provides a high-frequency sample of atmospheric temperature, humidity, wind speed and direction, and geopotential height.