TAMDAR observations not only include icing and turbulence, but also temperature, pressure, winds aloft, and relative humidity (RH). Additionally, each observation includes GPS-derived horizontal and vertical (altitude) coordinates, as well as a time stamp to the nearest second. With a continuous stream of observations, TAMDAR provides much higher spatial and temporal resolution compared to the Radiosonde (RAOB) network, as well as a more complete data set than ACARS, which lacks RH. Current upper-air observing systems are also subject to large latency based on obsolete communication networks and quality assurance protocol. TAMDAR observations are typically received, processed and quality controlled, and available for distribution or model assimilation in less than 15 seconds from the sampling time. The sensor requires no crew involvement; it operates automatically, and sampling rates and calibration constants can be adjusted by remote command from the AirDat operations center in Morrisville, NC.
Numerous third-party studies have been conducted by NOAA-GSD, the National Center for Atmospheric Research (NCAR), and various universities to verify the accuracy of TAMDAR against weather balloons and aircraft test instrumentation, as well as quantifying the TAMDAR-related impacts on numerical weather prediction (NWP). Ongoing data denial experiments suggest that the inclusion of TAMDAR data can significantly improve forecast model accuracy with the greatest gains realized during more dynamic events.
The TAMDAR system has been in continuous operation on regional airliners over the central United States since December 2004. AirDat is currently in the process of equipping over 425 aircraft that serve the continental United States and Alaska, which will provide over 5000 daily soundings.
At Lower Altitudes, The Picture Gets a Little Clearer.(Tropospheric Airborne Meteorological Data Reporting (TAMDAR) system of atmospheric readings)
May 08, 2006; Regional airline pilots soon should be able to tap into a more detailed and real-time picture of weather problems than what they...