Leibniz-Institute of Atmospheric Physics
TEMPERATURE OBSERVATIONS ABOVE ALOMAR – SEASONAL CYCLE AND GRAVITY WAVES – AN UPDATE
Authors: Jens Hildebrand, Gerd Baumgarten, Jens Fiedler, Franz-Josef Lübken
(Leibniz-Institute of Atmospheric Physics (IAP), Kühlungsborn, Germany)
The ALOMAR Rayleigh/Mie/Raman lidar at Andøya in Northern Norway measures temperatures on a routine basis since 1997. Due to its full daylight capability, observations cover all seasons and all local times. Previous studies already derived a seasonal cycle of middle-atmosphere temperatures above ALOMAR, basing on day-mean temperature profiles. Since then the amount of data tripled (now about 15 000 h) and the signal quality of the lidar improved remarkably, extending its altitude coverage and allowing higher temporal and vertical resolutions on the order of few minutes and few hundred meters, respectively. Therefore, it is reasonable to update and extent these studies with regard to various aspects, e.g., tides, gravity waves, and year-to-year variations. We have implemented new automated methods for retrieval, data reduction, and processing, respecting data standards developed within the ARISE2 project. We will present first results concerning the seasonal cycle of temperatures above ALOMAR and gravity wave studies during winter and summer.