According to the Glossary of Meteorology from the American
Meteorological Society, fog is a collection of water droplets suspended in the
atmosphere in the vicinity of the earth's surface that affects visibility.
Specifically, fog reduces visibility below 1 kilometer (or 0.62 miles). It
is the biggest cause of aviation accidents, severe fog can lead to poor
visibility, affecting the aircraft’s normal taking-off and landing, increasing
the aircraft’s ice, bumps, etc., in the clouds. A long-time continuing fog
causes airport closures, flights canceled, resulting in a large number of
passengers stranded, affecting the flight safety and normal operating order.
In this study, the authors aimed to investigate the Classification of
Synoptic Circulation Patterns for Fog in the Urumqi Airport in Xinjiang, China.
By using relevant climate statistical method, the hourly ground observation
data and four times per day and NCEP/NCAR reanalysis data (1° × 1°) from 1985
to 2014 were analyzed. The results showed that: 1) The occurrence of fog
significantly increased during 1985 and 2014; There were two stages of the
airport fog in the 30 years: less-fog period (1985-2002) and more-fog period
(2002-2014), the fog focused occurred in November to March of the following
year, most in December and least in March; 2) Based on Lamb-Jenkinson
method, the dominant types of fog in Urumqi Airport were C, E, SE, W, A types
(Among them, A, C, E, W, SE are the circulation types. C is Cyclone, A is
Anti-cyclone, E is East, W is West, SE is Southeast), and the international
distribution of each type was also different; 3) The dominant types of
persistence fog were A, C, E, SE types, A type appeared in the afternoon to the
nighttime, in the morning less frequent, on the other hand, C type was just the
opposite; 4) Atmospheric circulation characteristics for persistence fog
profile can be divided into four series: A, C, E, SE series, and climatic
characteristics in different series were different.
Article
by Nan Wang, et al, from Urumqi, China.
Full
access: http://mrw.so/1fcTts
Image
by Henrique Junior, from Flickr-cc.
Good guidance for the people who want establish their business in dubai...i really like your efforts
回复删除PlusUAE is a business consultancy, helps in setting up new business ventures for local and international business investors in Abu Dhabi, United Arab Emirates.