Journal of Food, Agriculture and Environment

Studies on dew formation and its meteorological factors 

Author(s):

Lie Chen ¹, Ralph Meissner ³, Yuqing Zhang ², Huijie Xiao ²*

Recieved Date: 2013-01-19, Accepted Date: 2013-04-22

Abstract:

Dew is of significance in ecosystem. It is part of precipitation, in some arid area even exceeds the rainfall and determines the survival of plants and animals. In addition, dew exiting on leaves can reduce transpiration rate and prolong the survival of tree seedlings. In contrast, in agriculture dew can form water film on plant leaves and result in development of bacteria, fungal pathogens and plant epidemics. Dew formation results from radiation loss of surface, which leads to a surface temperature below dew point of air. Air temperature, relative humidity, cloud cover and wind speed are generally taken as the key meteorological factors for dew formation. For dew studies there is no universal method, lysimeter now is considered as a promising method to measure dewfall, and some model established on the basis of energy balance equation is possible alternative. Since dew occurs only when surface temperature reaches dew point, the properties of a surface could affect dew formation, for different types of vegetation and stages of its development dewfall differed significantly. 

Keywords:

Precipitation, dew formation, radiative loss, meteorological factors, energy balance

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Environment
Pages: 1063-1068

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