Characteristics of the Boundary Layer Structure of Sea Fog on the Coast of Southern China |
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Authors: | LIU Hongnian JIANG Weimei HUANG Jian HUANG Jian and MAO Weikang |
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Institution: | School of Atmospheric Sciences, Nanjing University, Nanjing 210093,School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Open Laboratory for Tropical Monsoon and Joint Open Laboratory of Marine Meteorology, Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080,Key Open Laboratory for Tropical Monsoon and Joint Open Laboratory of Marine Meteorology, Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080,Key Open Laboratory for Tropical Monsoon and Joint Open Laboratory of Marine Meteorology, Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080 |
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Abstract: | Using boundary layer data with regard to sea fog observed at the Science
Experiment Base for Marine Meteorology at Bohe, Guangdong Province, the
structure of the atmospheric boundary layer and the characteristics of the
tops of the fog and the clouds were analyzed. In addition, the effects of
advection, radiation, and turbulence during sea fog were also investigated.
According to the stability definition of saturated, wet air, the gradient of
the potential pseudo-equivalent temperature equal to zero was defined as the
thermal turbulence interface. There is evidence to suggest that two layers
of turbulence exist in sea fog. Thermal turbulence produced by long-wave
radiation is prevalent above the thermal turbulence interface, whereas
mechanical turbulence aroused by wind shear is predominant below the
interface. The height of the thermal turbulence interface was observed
between 180 m and 380 m. Three important factors are closely related to the
development of the top of the sea fog: (1) the horizontal advection of the
water vapor, (2) the long-wave radiation of the fog top, and (3) the
movement of the vertical turbulence. Formation, development, and dissipation
are the three possible phases of the evolution of the boundary-layer
structure during the sea fog season. In addition, the thermal turbulence
interface is the most significant turbulence interface during the formation
and development periods; it is maintained after sea fog rises into the
stratus layer. |
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Keywords: | coast of Southern China sea fog boundary layer structure advection radiation turbulence |
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