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| Radiosonde Observations (RAOB) | |
|---|---|
| Name | Radiosonde Observations (RAOB) |
| Caption | Radiosonde launch at a synoptic station |
| Invented | 1920s |
| Inventor | :Category:Inventors |
| Type | Atmospheric sounding |
| Sector | Meteorology |
Radiosonde Observations (RAOB) are in situ atmospheric soundings obtained by instrument packages carried aloft by free balloons to measure vertical profiles of pressure, temperature, humidity and wind, and transmitted to ground stations for synoptic and research use. RAOBs form a backbone of operational weather forecasting, climate monitoring and research, providing ties to satellite remote sensing, radiosonde networks, and numerical weather prediction systems. These observations are collected by national services and international organizations and are critical to agencies such as World Meteorological Organization, National Oceanic and Atmospheric Administration, European Centre for Medium-Range Weather Forecasts and research programs tied to Intergovernmental Panel on Climate Change assessments.
Radiosonde deployments began in the 1920s and expanded through coordinated programs including World Meteorological Organization standards, Global Observing System, and national networks run by agencies like National Weather Service, Met Office, Météo‑France, Deutscher Wetterdienst and Japan Meteorological Agency. RAOBs provide vertical resolution and temporal coverage that complement satellite sounders from missions such as NOAA POES, MetOp, Aqua, and Suomi NPP, and are assimilated into systems like ERA5, GFS, ECMWF Reanalysis and regional models supported by European Organisation for the Exploitation of Meteorological Satellites. International data exchange occurs via Global Telecommunication System and archives maintained by National Centers for Environmental Information and research institutes like NCAR and CSIRO.
A typical radiosonde package combines sensors produced by manufacturers and tested against standards from World Meteorological Organization and national metrology institutes such as NIST. The device contains pressure, temperature and humidity sensors, a radio transmitter, and GPS or radio-tracking equipment by suppliers linked to aerospace firms and research centers including Vaisala, GRAW, Lindenberg Observatory, and university labs at MIT, Stanford University, University of Reading and University of Tokyo. Launch procedures follow protocols used at synoptic stations like London Heathrow Observatory, Sydney Observatory, Payerne Observatory and military meteorological units, with balloon inflation, payload attachment and forecast coordination with centers such as National Hurricane Center or Met Éireann for special deployments.
RAOBs measure atmospheric thermodynamic and kinematic variables: static pressure via aneroid or electronic sensors traceable to International Bureau of Weights and Measures, temperature by platinum resistance or thermistor elements calibrated against standards at institutions like Physikalisch-Technische Bundesanstalt, and moisture via capacitive or chilled-mirror hygrometers referenced to facilities such as European Centre for Standards. Wind profiles are derived from GPS-based position and velocity solutions or Doppler radio fixes linked to systems used by NOAA and research projects at Scripps Institution of Oceanography and Lamont–Doherty Earth Observatory. Specialized sondes include ozone sensors developed with collaboration from NASA, aerosol sondes used in campaigns by CERN-affiliated experiments, and expendable variants employed in oceanic programs by Naval Research Laboratory.
RAOB data undergo operational quality control at national centers such as Met Office, NOAA/NWS, Environment and Climate Change Canada and are processed into formats standardized by World Meteorological Organization and archived at repositories including NCEI and reanalysis projects like ERA‑Interim. Automated and manual checks flag sensor drifts, radiosonde biases, and transmission gaps; adjustments follow procedures developed in intercomparison campaigns involving WMO working groups, GCOS panels, and research collaborations with University of Colorado and ETH Zurich. Homogenization and bias correction methods trace to studies by teams at Princeton University, University of East Anglia and Lamont-Doherty, informing climate-quality datasets used by IPCC.
RAOB data support operational forecasting at centers including ECMWF, NCEP, JMA, and are indispensable for severe weather warnings issued by agencies like Storm Prediction Center and Bureau of Meteorology. Research uses span climatology studies in programs run by World Climate Research Programme, validation of satellite products from missions like Aqua and MetOp, atmospheric chemistry campaigns coordinated by NOAA Earth System Research Laboratories and model development at institutions such as MIT, NCAR, LSCE and Max Planck Institute for Meteorology. Specialized applications include tropical cyclone reconstructions by Joint Typhoon Warning Center, aviation forecasting for authorities like FAA and Eurocontrol, and paleoclimate constraint via upper-air trend analyses used in IPCC reports and national assessments by EPA.
RAOB datasets are subject to several limitations recognized by WMO and research centers including NCAR and CSIRO: sensor biases that evolve with manufacturing variations from vendors like Vaisala and GRAW; representativeness errors over complex terrain exemplified near Rocky Mountains, Himalayas and Andes; temporal sampling constraints of 00/12 UTC synoptic launches coordinated through GTS; and data gaps over oceans despite expendable sondes used by NOAA and naval programs. Errors arise from solar heating, wet-bulb effects, GPS signal multipath near urban sites such as Tokyo and New York City, and historical discontinuities tied to changes in instrumentation documented by climatology groups at University of East Anglia and NOAA.
The global RAOB enterprise evolved through milestones at observatories and institutions including Lindau Observatory, Mount Washington Observatory, Royal Observatory Greenwich, and programs run by U.S. Weather Bureau, Deutscher Wetterdienst and Japan Meteorological Agency. Postwar expansion integrated research from NCAR, operational coordination by WMO and technological advances from companies like Vaisala, enabling the modern Global Observing System and reanalysis efforts by ECMWF and NCEP. Historical campaigns—such as coordinated synoptic programs during International Geophysical Year and targeted field campaigns organized by ARM and GCSS—shaped protocols still in use at national services including Met Office and Bureau of Meteorology.
Category:Atmospheric sounding