dorsal/arxiv
View SchemaCloud boundary height measurements using lidar and radar
| Authors | Victor Venema, Herman Russchenberg, Arnoud Apituley, Andre van Lammeren, Leo Ligthart |
|---|---|
| Categories | |
| ArXiv ID | physics/0306069 |
| URL | https://arxiv.org/abs/physics/0306069 |
| DOI | 10.1016/S1464-1909(99)00139-2 |
| Journal | Physics and Chemistry of the Earth, 24, no. 2, pp. 129-134, 2000 |
Abstract
Using only lidar or radar an accurate cloud boundary height estimate is often not possible. The combination of lidar and radar can give a reliable cloud boundary estimate in a much broader range of cases. However, also this combination with standard methods still can not measure the cloud boundaries in all cases. This will be illustrated with data from the Clouds and Radiation measurement campaigns, CLARA. Rain is a problem: the radar has problems to measure the small cloud droplets in the presence of raindrops. Similarly, few large particles below cloud base can obscure the cloud base in radar measurements. And the radar reflectivity can be very low at the cloud base of water clouds or in large regions of ice clouds, due to small particles. Multiple cloud layers and clouds with specular reflections can pose problems for lidar. More advanced measurement techniques are suggested to solve these problems. An angle scanning lidar can, for example, detect specular reflections, while using information from the radars Doppler velocity spectrum may help to detect clouds during rain.
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"abstract": "Using only lidar or radar an accurate cloud boundary height estimate is often\nnot possible. The combination of lidar and radar can give a reliable cloud\nboundary estimate in a much broader range of cases. However, also this\ncombination with standard methods still can not measure the cloud boundaries in\nall cases. This will be illustrated with data from the Clouds and Radiation\nmeasurement campaigns, CLARA. Rain is a problem: the radar has problems to\nmeasure the small cloud droplets in the presence of raindrops. Similarly, few\nlarge particles below cloud base can obscure the cloud base in radar\nmeasurements. And the radar reflectivity can be very low at the cloud base of\nwater clouds or in large regions of ice clouds, due to small particles.\nMultiple cloud layers and clouds with specular reflections can pose problems\nfor lidar. More advanced measurement techniques are suggested to solve these\nproblems. An angle scanning lidar can, for example, detect specular\nreflections, while using information from the radars Doppler velocity spectrum\nmay help to detect clouds during rain.",
"arxiv_id": "physics/0306069",
"authors": [
"Victor Venema",
"Herman Russchenberg",
"Arnoud Apituley",
"Andre van Lammeren",
"Leo Ligthart"
],
"categories": [
"physics.ao-ph"
],
"doi": "10.1016/S1464-1909(99)00139-2",
"journal_ref": "Physics and Chemistry of the Earth, 24, no. 2, pp. 129-134, 2000",
"title": "Cloud boundary height measurements using lidar and radar",
"url": "https://arxiv.org/abs/physics/0306069"
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