Cite as:
Lehnert, L.; Thies, B.; Trachte, K.; Achilles, S.; Osses, P.; Baumann, K.; Schmidt, J.; Samolov, E.; Jung, P.; Leinweber, P.; B&uuml;del, B. &amp; Bendix, J. (2018): <b>A Case Study on Fog/Low Stratus Occurrence at Las Lomitas, Atacama Desert (Chile) as a Water Source for Biological Soil Crusts</b>. <i>Aerosol and Air Quality Research</i> <b>18</b>(1), 254-269.

Resource Description

Title: A Case Study on Fog/Low Stratus Occurrence at Las Lomitas, Atacama Desert (Chile) as a Water Source for Biological Soil Crusts
FOR816dw ID: 306
Publication Date: 2018-01-01
License and Usage Rights:
Resource Owner(s):
Individual: Lukas Lehnert
Individual: Boris Thies
Individual: Katja Trachte
Individual: Sebastian Achilles
Individual: Pablo Osses
Individual: Karen Baumann
Individual: Jakob Schmidt
Individual: Elena Samolov
Individual: Patrick Jung
Individual: Peter Leinweber
Individual: Burkhard Büdel
Individual: Jörg Bendix
The Atacama Desert is well known for the high occurrence of large-scale fog (spatial extents: hundreds of kilometers) emerging as low stratus (LST) decks over the Pacific Ocean. By contrast, the small-scale and heterogeneous occurrence of small-scale fog (hundreds of meters) particularly during summers is widely unconsidered. However, these events are important for the local vegetation and particularly for the biological soil crusts (BSC) that are widely distributed in this extreme ecosystem. Consequently, a case study in a typical fog oasis in the Pan de Azúcar National Park was conducted to test the feasibility combining field measurements, drone profiling, remote sensing and numerical modeling (i) to investigate fog-type specific differences regarding dynamics, physical properties and formation, (ii) to test the applicability of remote sensing technology for fog monitoring based on existing low-resolution and a proposed new high-resolution product and (iii) to estimate the related fog water input to BSCs. Two types of fog were observed. The well-known fog/LST deck emerging from the Pacific Ocean with high water path and large spatial extent was the first type. Fog of the second type was patchier, small-scale and not necessarily connected to the LST over the ocean. Instead, fog formation of the second type was related to thermal breeze systems, which produced shallow clouds containing less water than those of type 1. In general, such small-scale fog events were not captured well by existing remote sensing products but could be detected with the proposed new high-resolution product which provided promising results. Both fog types were important water resources for the BSCs, with approximately 8% to 24% of the fog water flux available to the BSCs at the surface. The results indicated the feasibility of the proposed methods’ pool to estimate the water budget of BSCs with a high spatial resolution in the future.
| Landsat | fog observations | Orographic fog | Biological soil crust |
Literature type specific fields:
Journal: Aerosol and Air Quality Research
Volume: 18
Issue: 1
Page Range: 254-269
Metadata Provider:
Individual: Lukas Lehnert
Online Distribution:
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