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Fog type classification using a modified Richardson number for Christchurch, New Zealand

Lin, Dongqi ; Katurji, Marwan; Revell, Laura E.; Khan, Basit 1; Osborne, Neal; Soltanzadeh, Iman; Kremser, Stefanie
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)


Situated on a coastal plain between the Southern Alps and Banks Peninsula, Christchurch, New Zealand, experiences around 49 fog days every year. Given its complex topography, accurate fog forecasting is difficult at Christchurch International Airport (CHA). Climatological analysis of local fog events is an important first step to gain insight into the processes involved in the fog life-cycle. In this study, fog events were identified using 12 years of meteorological observations from an automatic weather station situated at CHA. A novel fog type classification method was developed using the modified Richardson number (MRi). The MRi fog type classification method assesses the local dynamic stability of a 1.25 m shallow layer of near-surface air. Here, the MRi is used as a quantitative index to classify advection fog, advection–radiation fog, and radiation fog. Vertical gradients of air temperature and wind speed were derived for prefog and fog periods, and a number of criteria were applied to the MRi for the fog type classification. The fog type classification results were examined in correspondence with the derived fog intensity, duration, diurnal and seasonal variability of frequency of occurrences, and synoptic and local wind flows. ... mehr

DOI: 10.1002/joc.7761
Zitationen: 5
Web of Science
Zitationen: 5
Zitationen: 6
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0899-8418, 1097-0088
KITopen-ID: 1000148055
HGF-Programm 12.11.11 (POF IV, LK 01) Urban Climate and Air Quality
Erschienen in International Journal of Climatology
Verlag John Wiley and Sons
Band 43
Heft 1
Seiten 314-330
Vorab online veröffentlicht am 16.06.2022
Schlagwörter fog climatology, fog type classification, modified Richardson number
Nachgewiesen in Dimensions
Web of Science
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