(2) AMDAR T ±0.5-1°C possible ±10 continuous 200–300 110 km ASDAR on about 40 V ±0.5–3 m/s m/s error in commercial mb along flight aircraft (est for 1986). air routes (see path 4000 craft in 2009; Double comments) (~140,000 obs./day). values when Also takes “soundings” comparing to when plane takes off and radiosondes lands. Few obs (150/day) in 1990 (3) T ±1°C? location continuous 200–300 About 3,000 aircraft V ±0.5–3 m/s errors. ±10 air routes mb e along (4,500/day) By 2000: m/s every ~1,100 AIREPS/day tenth meridian d Satellite:
(2) AMDAR T V ±0.5-1°C ±0.5–3 m/s possible ±10 m/s error in Double values when comparing to radiosondes continuous commercial air routes 200–300 mb (see comments) 110 km along flight path ASDAR on about 40 aircraft (est for 1986). 4000 craft in 2009; (~140,000 obs./day). Also takes “soundings” when plane takes off and lands. Few obs (150/day) in 1990 (3) T V ±1°C? ±0.5–3 m/s location errors. ±10 m/s continuous air routes 200–300 mb along every tenth meridian d About 3,000 aircraft (4,500/day) By 2000: ~1,100 AIREPS/day Satellite: e