Simultaneous and co-located wind measurements in the middle atmosphere by lidar and rocket-borne techniques

Franz-Josef Lübken, Gerd Baumgarten, Jens Hildebrand, Francis J. Schmidlin
2016 Atmospheric Measurement Techniques Discussions  
We present the first comparison of a new lidar technique to measure winds in the middle atmosphere, called DoRIS (Doppler Rayleigh Iodine Spectrometer), with rocket-borne insitu observations which rely on measuring the horizontal drift of a target ('starute') by a tracking radar. The launches took place from the Andøya Space Center (ASC), very close to the ALOMAR observatory (Arctic Lidar Observatory for Middle Atmosphere Research) at 69° N. DoRIS is part of a steerable twin lidar system
more » ... ed at ALOMAR. The observations were made simultaneously and with a horizontal distance between the two lidar beams and the starute trajectories of typically 0–40 km only. DoRIS measured winds from 14 March 2015, 17:00 UTC to 15 March 2015, 11:30 UTC. A total of 8 starute flights were launched successfully from 14 March, 19:00 UTC to 15 March, 00:19 UTC. In general there is excellent agreement between DoRIS and the insitu measurements considering the combined range of uncertainties. This concerns not only the general height structures of zonal and meridional winds and their temporal developments, but also some wavy structures. Considering the comparison between all starute flights and all DoRIS observations in a time period of ±20 min around each individual starute flight, we arrive at mean differences of typically ±5–10 m/s for both wind components. Part of the remaining differences are most likely due to the detection of different wave fronts of gravity waves. There is no systematic difference between DoRIS and the insitu observations above 30 km. Below ~30 km winds from DoRIS are systematically too large by up to 10–20 m/s which can be explained by the presence of aerosols. This is proven by deriving the backscatter ratios at two different wavelengths. These ratios are larger than unity, which is an indication for the presence of aerosols.
doi:10.5194/amt-2016-106 fatcat:3flqetfagfgtbevfrqekuj2d7y