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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-213
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Jul 2018

Research article | 10 Jul 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

First fully-diurnal fog and low cloud satellite detection reveals life cycle in the Namib

Hendrik Andersen1,2 and Jan Cermak1,2 Hendrik Andersen and Jan Cermak
  • 1Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research
  • 2Karlsruhe Institute of Technology (KIT), Institute of Photogrammetry and Remote Sensing

Abstract. Fog and low clouds (FLC) are a typical feature along the southwestern African coast, especially in the central Namib, where fog constitutes a valuable resource of water for many ecosystems. In this study, a novel algorithm to detect FLC over land from geostationary satellite data using only infrared observations is presented. The algorithm is the first of its kind as it is stationary in time and thus able to reveal a detailed view into the diurnal and spatial patterns of FLC in the Namib region. A validation against net radiation measurements from a station network in the central Namib reveals a high overall accuracy with a probability of detection of 94%, a false alarm rate of 12% and an overall correctness of classification of 97%. The average timing and persistence of FLC seem to depend on the distance to the coast, suggesting that the region is dominated by advection-driven FLC. While the algorithm is applied to study Namib-region fog and low clouds, it is designed to be transferable to other regions and can be used to retrieve long-term data sets.

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Hendrik Andersen and Jan Cermak
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Hendrik Andersen and Jan Cermak
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Short summary
Fog and low clouds (FLC) are a valuable source of water for many ecosystems in the Namib. This study presents to first fully-diurnal satellite detection of FLC, revealing the spatial and temporal patterns in the Namib. A validation is conducted against station measurements in the central Namib and shows a high overall accuracy. The average timing and persistence of FLC seem to depend on the distance to the coast, suggesting that the region is dominated by advection-driven FLC.
Fog and low clouds (FLC) are a valuable source of water for many ecosystems in the Namib. This...
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