First fully diurnal fog and low cloud satellite detection reveals life cycle in the Namib
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Published:2018-10-05
Issue:10
Volume:11
Page:5461-5470
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Andersen HendrikORCID, Cermak JanORCID
Abstract
Abstract. Fog and low clouds (FLCs) 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 is presented to
detect FLCs over land from geostationary satellite data using only infrared
observations. The algorithm is the first of its kind as it is
stationary in time and thus able to reveal a detailed view of the diurnal
and spatial patterns of FLCs 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 FLCs seem to depend on the distance to
the coast, suggesting that the region is dominated by advection-driven FLCs.
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.
Funder
Deutsche Forschungsgemeinschaft
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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