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Abstract
The development of a first ever autonomous aerosol and cloud backscatter lidar system for on-buoy arctic observations has been achieved in 2014, within the French EQUIPEX IAOOS project developed in collaboration with LOCEAN at UPMC. This development is part of a larger set-up designed for integrated ocean-ice-atmosphere observations. First results have been obtained from spring to autumn 2014 after the system was installed at the North Pole at the Barneo Russian camp, and in winter-spring 2015 during the Norwegian campaign N-ICE 2015. The buoys were taking observations as drifting in the high arctic region where very few measurements have been made so far. This project required the design and the conception of an all-new lidar system to fit with the numerous constraints of such a deployment. We describe here the prototype and its performance. First analyzes are presented.
Highlights
The arctic region is of main importance in the global climate changes, in particular because consequences of global warming are larger there
The goal of the French EQUIPEX IAOOS project is to bridge this gap by deploying a network of autonomous LIDAR set on drifting buoys, as well as others oceanographic instruments in the high arctic region
Using Haar wavelet and adapted threshold over vertical profiles, base and effective top of clouds have been retrieved, regardless of how high or low were the amplitude of the window diffused signal. This first analysis shows very low base of clouds (Fig. 3), frequently below1km of altitude and a high frequency of very low altitude cloudiness, mostly due to supercooled water clouds. This is in good agreement with measurements made during SHEBA [3]
Summary
The arctic region is of main importance in the global climate changes, in particular because consequences of global warming are larger there. On the atmospheric field it means studies of vertical distribution of aerosols and clouds (type, height and optical/microphysical properties), to allow a better determination of the arctic cloud radiative forcing. To access these data vertically resolved measurements are needed, and more LIDAR measurements in the high arctic region (above 75°N). The goal of the French EQUIPEX IAOOS project is to bridge this gap by deploying a network of autonomous LIDAR set on drifting buoys, as well as others oceanographic instruments in the high arctic region. During about 8 months the buoy has drifted toward the north of Svalbard, providing more than 750 profiles as a whole. Performances are compared with simulations, and first results are given
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