EVOLUTION OF LIQUID WATER CONTENT IN A SEA FOG CONTROLLED BY A HIGH-PRESSURE PATTERN

LI Xiao-na; HUANG Jian; SHEN Shuang-he; LIU Shou-dong; LU Wei-hua

Abstract:

On March 16–C17, 2008, a sea fog occurred in Dianbai in the west of Guangdong Province and was accompanied by a high-pressure synoptic system. Using comprehensive observation datasets, this study analyzes the evolution of liquid water content during this sea fog and investigates the relationships between liquid water content and the average diameters and count densities of fog droplets, air temperature, wind speed and turbulence exchanges. The main results are presented as follows. (1) The sea fog showed a quasi-periodic oscillation characteristic, i.e., it developed, disappeared and then developed again. (2) During the sea fog, the number of fog droplets changed significantly while the changes in average diameter of the fog droplets were relatively small. The development and disappearance of the sea fog correlated significantly with the fog droplet numbers. (3) The air-cooling mechanism played a significant role in sea fog formation and development. However, the influences of this mechanism were not evident during fog persistence. (4) During sea fog formation, weak turbulence exchanges were helpful for fog formation. During sea fog development and persistence, liquid water content increased when turbulence exchanges weakened, and vice versa. The changes in turbulence exchanges were closely related to the quasi-periodic oscillations observed in sea fog presence.

Get Citation+

LI Xiao-na, HUANG Jian, SHEN Shuang-he, et al. EVOLUTION OF LIQUID WATER CONTENT IN A SEA FOG CONTROLLED BY A HIGH-PRESSURE PATTERN [J]. Journal of Tropical Meteorology, 2010, 16(4): 409-416.

Export:

Article Metrics

EVOLUTION OF LIQUID WATER CONTENT IN A SEA FOG CONTROLLED BY A HIGH-PRESSURE PATTERN

Institute of Applied Meteorology, University of Nanjing Information Science & Technology

Abstract: On March 16–C17, 2008, a sea fog occurred in Dianbai in the west of Guangdong Province and was accompanied by a high-pressure synoptic system. Using comprehensive observation datasets, this study analyzes the evolution of liquid water content during this sea fog and investigates the relationships between liquid water content and the average diameters and count densities of fog droplets, air temperature, wind speed and turbulence exchanges. The main results are presented as follows. (1) The sea fog showed a quasi-periodic oscillation characteristic, i.e., it developed, disappeared and then developed again. (2) During the sea fog, the number of fog droplets changed significantly while the changes in average diameter of the fog droplets were relatively small. The development and disappearance of the sea fog correlated significantly with the fog droplet numbers. (3) The air-cooling mechanism played a significant role in sea fog formation and development. However, the influences of this mechanism were not evident during fog persistence. (4) During sea fog formation, weak turbulence exchanges were helpful for fog formation. During sea fog development and persistence, liquid water content increased when turbulence exchanges weakened, and vice versa. The changes in turbulence exchanges were closely related to the quasi-periodic oscillations observed in sea fog presence.

HTML

Reference (22)

[1]	ROACH W T. On the effect of radiative exchange on thegrowth by condensation of a cloud or fog droplet [J]. Quart. J.Roy. Meteor. Soc., 1976, 102: 361-372.
[2]	ROACH W T, BROWN R, CAUGHEY S J, et al. Thephysics of radiation fog Part I: A field study [J]. Quart. J. Roy.Meteor. Soc., 1976, 102: 313-333.
[3]	GERBER H E. Microstructure of a radiation fog [J]. J.Atmos. Sci., 1981, 38(2):454-458.
[4]	LI Zi-hua, HUANG Jian-ping. Physical structure of thefive-day sustained fog around Nanjing in 1996 [J]. ActaMeteor. Sinica, 1999, 57(5): 622-631.
[5]	LI Zhi-hua, ZHANG Li-min, LOU Xiao-feng. Themacro-and micro-structure of winter fog in the Chongqingurban district and the physical cause of its formation [J]. J.Nanjing Inst. Meteor., 1993, 16(1): 48-54.
[6]	DENG Xue-jiao, WU Dui, YE Yan-xiang. Physicalcharacteristics of dense fog at Nanling mountain region [J]. J.Trop. Meteor., 2002, 18(3): 227-236.
[7]	SUN Dan, ZHU Bin, DU Wu-peng. The temporal andspatial distribution of thick fog frequency in China [J]. J. Trop.Meteor., 2008, 24(5): 497-501.
[8]	YANG Lian-su. A preliminary observations of themicrophysical structure of fog in Qingdao area [J]. Marine Sci.,1985, 9(4): 49-50.
[9]	XU Jing-qi, ZHANG Zheng, WEI Hao. Measurement andanalysis of droplet spectrum and liquid water content of seafog [J]. Trans. Oceanol. Limnol., 1994, 16(2):174-178.
[10]	YANG Zhong-qiu, XU Shao-zhu, GEN Biao. Theformation and microphysical structure of sea fog at Zhoushanin spring [J]. Acta Oceanol. Sinica, 1989, 11(4):431-438．
[11]	ZHAO Bo-lin, ZHANG Ai-shen. The principle ofatmospheric detection [M]. Beijing: Meteorolgical Press, 1990:578.
[12]	DMT Inc. Fog Monitor Operator Manual Doc-:0088Revision A [Z]. 2005.
[13]	WANG Bin-hua．Sea Fog [M]. Beijing: Ocean Press, 1983:352.
[14]	LALA G G, JIUSTO J E, MEYER M B, et al.Mechanisms of radiation fog formation on four consecutivenights [C]// Preprints Conf. Cloud Physics, Chicago: Amer.Meteor. Soc., 1982: 9-11.
[15]	QU Feng-qiu, LIU Shou-dong, YI Yan-ming et al. Theobservation and analysis of sea fog event at the South China[J]. J. Trop. Meteor., 2008, 24(5): 490-496.
[16]	HUANG Hui-jun, HUANG Jian, LIU Chun-xia, et al.Prediction of sea fog Guangdong coastland using the variablefactors output by GRAPES model [J]. J. Trop. Meteor., 2010,26(1): 31-39.
[17]	FINDLATER J, ROACH W T, MCHUGH B C. ProjectHaar Air Clues [J]. The Magazine of Royal Air Force, 1985,39(9): 350-353.
[18]	LEIPPER D F. Fog on the United States West Coast: Areview [J]. Bull. Amer. Meteor. Soc., 1994, 75(2): 229-240.
[19]	LEWIS J M, KORACIN D, REDMOND K T. Sea fogresearch in the United Kingdom and United States: Ahistorical essay including outlook [J]. Bull. Amer. Meteor. Soc.,2004, 85(3): 395-408.
[20]	ROGERS D P, KORACIN D. Radiative transfer andturbulence exchanges in the cloud-topped marine atmosphericboundary layer [J]. J. Atmos. Sci., 1992, 49(16): 1 473-1 486.
[21]	TAYLOR G. The formation of fog and mist [J]. Quart. J.Roy. Meteor. Soc., 1917, 43: 241-268．
[22]	RODHE B．The effect of turbulence exchanges on fogformation [J]. Tellus, 1962, 14: 49-86.

EVOLUTION OF LIQUID WATER CONTENT IN A SEA FOG CONTROLLED BY A HIGH-PRESSURE PATTERN

Abstract:

References

Get Citation+

Share Article

Article Metrics

Proportional views

Manuscript History

Online:

通讯作者: 陈斌, bchen63@163.com