STATISTICAL CHARACTERISTICS AND NUMERICAL SIMULATION OF SEA LAND BREEZES IN HAINAN ISLAND

ZHANG Zhen-zhou; CAO Chao-xiong; SONG Yu; KANG Ling; CAI Xu-hui

Abstract:

The sea-land breeze circulation (SLBC) occurs regularly at coastal locations and influences the local weather and climate significantly. In this study, based on the observed surface wind in 9 conventional meteorological stations of Hainan Island, the frequency of sea-land breeze (SLB) is studied to depict the diurnal and seasonal variations. The statistics indicated that there is a monthly average of 12.2 SLB days and an occurrence frequency of about 40%, with the maximum frequency (49%) in summer and the minimum frequency (29%) in autumn. SLB frequencies (41%) are comparable in winter and spring. A higher frequency of SLB is present in the southern and central mountains due to the enhancement effect of the mountain-valley breeze. Due to the synoptic wind the number of SLB days in the northern hilly area is less than in other areas. Moreover, the WRF model, adopted to simulate the SLBC over the island for all seasons, performs reasonably well reproducing the phenomenon, evolution and mechanism of SLBC. Chiefly affected by the difference of temperature between sea and land, the SLBC varies in coverage and intensity with the seasons and reaches the greatest intensity in summer. The typical depth is about 2.5 km for sea breeze circulation and about 1.5 km for land breeze circulation. A strong convergence zone with severe ascending motion appears on the line parallel to the major axis of the island, penetrating 60 to 100 km inland. This type of weak sea breeze convergence zone in winter is north-south oriented. The features of SLBC in spring are similar both to that in summer with southerly wind and to that in winter with easterly wind. The coverage and intensity of SLBC in autumn is the weakest and confined to the southwest edge of the central mountainous area. The land breeze is inherently very weak and easily affected by the topography and weather. The coverage and intensity of the land breeze convergence line is significantly less than those of the sea breeze. The orographic forcing of the central mountain exhibits significant impacts on low-level airflow. A windward land breeze front usually occurs along the coastline between the wee hours and the morning in summer, with an arc-shaped convergence zone about 10 to 30 km off shore. In winter the arc-shaped convergence zone is weak and appears only in the southeast coastal area. Landing on the flat regions of northern to western parts of the island and going inland from there, the sea breeze front at the leeward side meets with that at the windward side in the centre of the island when sea breeze fully develops, causing an intense convergence zone throughout the whole island. Consistent with prevailing winds in direction, the windward sea breeze and leeward land breeze develop quickly but are not distinguishable from background winds.

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ZHANG Zhen-zhou, CAO Chao-xiong, SONG Yu, et al. STATISTICAL CHARACTERISTICS AND NUMERICAL SIMULATION OF SEA LAND BREEZES IN HAINAN ISLAND [J]. Journal of Tropical Meteorology, 2014, 20(3): 267-278.

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STATISTICAL CHARACTERISTICS AND NUMERICAL SIMULATION OF SEA LAND BREEZES IN HAINAN ISLAND

Department of Environmental Sciences, College of Environmental Sciences and Engineering, Peking University, State Joint Key Lab of Environmental Simulation and Pollution Control, Beijing 100871 China Unit 91715 of PLA Navy, Guangzhou 510450 China

Rev Recd Date: 2014-06-13

Abstract: The sea-land breeze circulation (SLBC) occurs regularly at coastal locations and influences the local weather and climate significantly. In this study, based on the observed surface wind in 9 conventional meteorological stations of Hainan Island, the frequency of sea-land breeze (SLB) is studied to depict the diurnal and seasonal variations. The statistics indicated that there is a monthly average of 12.2 SLB days and an occurrence frequency of about 40%, with the maximum frequency (49%) in summer and the minimum frequency (29%) in autumn. SLB frequencies (41%) are comparable in winter and spring. A higher frequency of SLB is present in the southern and central mountains due to the enhancement effect of the mountain-valley breeze. Due to the synoptic wind the number of SLB days in the northern hilly area is less than in other areas. Moreover, the WRF model, adopted to simulate the SLBC over the island for all seasons, performs reasonably well reproducing the phenomenon, evolution and mechanism of SLBC. Chiefly affected by the difference of temperature between sea and land, the SLBC varies in coverage and intensity with the seasons and reaches the greatest intensity in summer. The typical depth is about 2.5 km for sea breeze circulation and about 1.5 km for land breeze circulation. A strong convergence zone with severe ascending motion appears on the line parallel to the major axis of the island, penetrating 60 to 100 km inland. This type of weak sea breeze convergence zone in winter is north-south oriented. The features of SLBC in spring are similar both to that in summer with southerly wind and to that in winter with easterly wind. The coverage and intensity of SLBC in autumn is the weakest and confined to the southwest edge of the central mountainous area. The land breeze is inherently very weak and easily affected by the topography and weather. The coverage and intensity of the land breeze convergence line is significantly less than those of the sea breeze. The orographic forcing of the central mountain exhibits significant impacts on low-level airflow. A windward land breeze front usually occurs along the coastline between the wee hours and the morning in summer, with an arc-shaped convergence zone about 10 to 30 km off shore. In winter the arc-shaped convergence zone is weak and appears only in the southeast coastal area. Landing on the flat regions of northern to western parts of the island and going inland from there, the sea breeze front at the leeward side meets with that at the windward side in the centre of the island when sea breeze fully develops, causing an intense convergence zone throughout the whole island. Consistent with prevailing winds in direction, the windward sea breeze and leeward land breeze develop quickly but are not distinguishable from background winds.

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[1]	ATKINSON B W. Mesoscale Circulation in the Atmosphere [M]. Translators for Mesoscale Circulation in the Atmosphere. Beijing: China Meteorological Press, 1987: 124-215.
[2]	ABBS D J, PHYSICK W L. Sea-breeze observations and modeling: A review [J]. Aust. Meteor. Mag., 1992, 41(1): 7-19.
[3]	MILLER S T K, KEIM B D, TALBOT R W, et al. Sea breeze: structure, forecasting, and impacts [J]. Rev. Geophys., 2003, 41(1): 1-31.
[4]	CROSMAN E T, HOREL J D. Sea and lake breezes: a review of numerical studies [J]. Bound-Layer Meteor., 2010, 137(1): 1-29.
[5]	STULL R S. An Introduction to Boundary Layer Meteorology [M]. USA: Kluwer Academic Publishers, 1988: 416-419.
[6]	JIANG Wei-mei. The Meteorology on Air Pollution [M]. Nanjing: Nanjing University Press, 2003: 243-261.
[7]	PIELKE R A. A Three-dimensional numerical model of the sea breezes over south Florida [J]. Mon. Wea. Rev., 1974: 102(2): 115-139.
[8]	GAO Su-hua, HUANG Zeng-ming, ZHANG Tong-qin, et al. The Climate in Hainan Island [M]. Beijing: China Meteorological Press, 1988: 189.
[9]	ZHU Qian-gen, ZHOU Jun, WANG Zhi-ming, et al. Characteristics of the temperature and pressure fields of the sea-land breeze in May in coastal areas of southern China [J]. J. Nanjing Inst. Meteor., 1983, 2: 150-158.
[10]	ZHU Qian-gen, ZHOU Jun, ZHANG Ming-hua. Characteristics of Land-Sea Breeze Circulation in Coastal Areas of Southern China [C]// Proc. for Conference on Tropical Circulation and Systems (1982). Beijing: Ocean Press, 1984: 168-178.
[11]	WU Dui, CHEN Wei-chao, YOU Ji-ping. A study on near-surface flow field and land-sea breezes structure of Haikou area [J]. J. Trop. Meteor., 1995, 11(4): 306-314.
[12]	KE Shi-zhao, HUANG Jian. A numerical simulation of land and sea breezes in South China [J]. J. Trop. Meteor., 1993, 9(2): 169-176.
[13]	TU Xiao-ling, ZHOU Ming-yu, SHENG Shao-hua. The mesoscale numerical simulation of the flow field of the Hainan Island and the Leizhou Peninsula [J]. Acta Oceanol. Sinica, 1993, 12: 219-235.
[14]	ZHAI Wu-quan, LI Guo-jie, SUN Bin, et al. Season’s wind fields of mesoscale circulation in Hainan Island [J]. J. Trop. Meteor., 1997, 13(4): 315-322.
[15]	LIN Wen-shi, WANG An-yu, WU Chi-sheng, et al. A case modeling of sea-land breeze in Macao and its neighborhood [J]. Adv. Atmos. Sci., 2001, 18(6): 1231-1240.
[16]	CHEN Xun-lai, FENG Ye-rong, FAN Shao-jia, et al. Effect of the off-shore background flow and sea-land breezes on haze weather over the Pearl River Delta region [J]. Chin. J. Atmos. Sci., 2008, 32(3): 530-542.
[17]	FOY B DE, ZAVALA M, BEI N, et al. Evaluation of WRF mesoscale simulations and particle trajectory analysis for the MILAGRO field campaign [J]. Atmos. Chem. Phy. Disc., 2009, 9: 2113-2163.
[18]	CHALLA V S, INDRACANTI J, RABARISON M K, et al. A simulation study of mesoscale coastal circulation in Mississippi Gulf coast [J]. Atmos. Res., 2009, 91(1): 9-25.
[19]	YU En-hong, MA Fu-chun, CHEN Bin, et al. On Sea-Land Breeze and Its Application [M]. Beijing: China Meteorological Press, 1997: 147.
[20]	FAN Shao-jia, TAN Kang-chu, LI Zhi-qin, et al. Wind field over the coast land of Guangdong [J]. Acta Sci. Nat. Univ. Sunyatseni, 1998, 37(4): 94-97.
[21]	ZHOU Bo-sheng, WANG Yong-xin, YU Jian-guo, et al. Observation results and analyses of the sea-land breeze over Yangjiang coastal region in Guangdong [J]. J. Trop. Meteor., 2002, 18(2): 188-192.
[22]	HE Da-zhang, ZHANG Sheng-lin. Local climate of mountainous areas in central Hainan Island [J]. Trop. Geogr., 1982, 2(1): 1-9.
[23]	WANG Wei, CINDY Bruyère, MICHAEL Duda, et al. ARW Version 3 Modeling System User's Guide [Z]. Mesoscale & Microscale Meteorology Division, National Center for Atmospheric Research, 2012.
[24]	LU Han-cheng, YANG Guo-xiang. The Principles and Forecasting of Mesoscale Weather [M]. Beijing: China Meteorological Press, 2004: 164-170.
[25]	GUO Dong-yan, ZHAI Pan-mao, JIANG Tao, et al. Characteristics and possible causes of spatial and temporal distribution of summer thunderstorms in Hainan [J]. Meteor. Sci. Technol. 2011, 39(5): 562-568.
[26]	WU Heng-qiang. Effect of terrain-caused by-passing flows in Hainan Island on the precipitation in the southern parts of Guangdong and Guangxi [J]. Sci. Atmos. Sinica, 1983, 7(3): 335-340.

STATISTICAL CHARACTERISTICS AND NUMERICAL SIMULATION OF SEA LAND BREEZES IN HAINAN ISLAND

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