NDLI: A Comprehensive Dynamic Threshold Algorithm for Daytime Sea Fog Retrieval over the Chinese Adjacent Seas

Content Provider	Springer Nature Link
Author	Zhang, Suping Yi, Li
Copyright Year	2013
Abstract	Sea fog influences human activities over oceans. It is somewhat difficult to separate sea fog from marine boundary stratus (low stratus and stratocumulus) by satellites due to their microphysical similarities and shared spectral features. For the purpose of improving sea fog detection over the Chinese adjacent seas where fog is common during the spring–summer seasons, the vertical structures of fog and stratus were analyzed using ground-based soundings, resulting in the observation of very explicit discrepancies between them, in terms of TAT − SST (TAT, the temperature at tops of fog or stratus; SST, the sea surface temperature). Based on these discrepancies and on previous related studies, we suggest a comprehensive dynamic threshold algorithm. The method combines real-time brightness temperature from Moderate Resolution Imaging Spectroradiometer channel 31 (~11 μm) with climatological monthly mean SSTs to produce a threshold that is monthly-dependent. The retrieved results are generally consistent with the observations from meteorological stations near the coast, on islands and from ships, and the scores of validation by conventional methods are promising. The distribution patterns of the retrieved sea fog frequency in May and June from 2006 to 2010 are both compatible with that from ship-based observations and exhibit more details that are consistent with our understanding of sea fog characteristics. This study is helpful for marine weather service and the improvement of models for sea fog forecasting.
Starting Page	1931
Ending Page	1944
Page Count	14
File Format	PDF
ISSN	00334553
Journal	Pure and applied geophysics
Volume Number	170
Issue Number	11
e-ISSN	14209136
Language	English
Publisher	Springer Basel
Publisher Date	2013-02-06
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sea fog retrieval marine boundary stratus MODIS comprehensive dynamic threshold Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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