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Investigating Mesospheric Mountain Wave Characteristics Over New Zealand During DEEPWAVE

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The Deep Propagating Gravity Wave Experiment, "DEEPWAVE" was an international measurement and modelling program designed to characterize the generation and propagation of a broad range of atmospheric gravity waves [GWs] with measurements extending from the ground to ~100 km altitude. A suite of aircraft-borne and ground-based aeronomic and weather measurements was deployed from New Zealand during a two-month period [June-July] in 2014 to investigate the wintertime gravity wave climatology.

Data used in this study were obtained by a collection of ground-based instrumentation operated at NIWA Lauder Station, NZ [45.0°S]. Instruments included an Advanced Mesospheric Temperature Mapper [AMTM], a Rayleigh Lidar and an All-Sky Imager. Analysis of image data obtained by the AMTM revealed a rich spectrum of GWs with 19 amazing mountain wave [MW] events generated by orographic forcing. This is the largest occurrence of MW activity recorded at MLT heights [80-100 km]. Here we show examples of three such events, illustrating their varying properties and their associated Momentum Flux [MF].


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