南海北部东沙岛以西陆坡区2021年秋季内波特征统计与分析*

doi:10.11978/2022265

Abstract

Abstract:

Observations from three moorings deployed in the continental slope area west of the Dongsha Plateau on the northern South China Sea (NSCS) from September to October 2021 are collected for the characteristic analysis of internal waves and internal solitary waves in the Liuhua oilfield area. Harmonic analysis shows the barotropic currents are obviously less than the baroclinic currents on the surface and bottom water layer. By comparison with the barotropic tidal currents obtained from TOPEX/Poseidon Global Inver Solution (TPXO7.2), it is found that the model results of semidiurnal tides are significantly better than that of diurnal tides, and the simulated results underestimate the current amplitude of O₁ tidal constituent, but overestimate that of K₁ tidal constituent. The internal tides show surface-bottom intensified baroclinic mode-1 structure, and the major axis of tidal ellipse of O₁ tidal constituent is larger than that of K₁. During the whole observation period, there are four internal solitary waves (ISWs) clusters passed by the Liuhua oilfield area in total, and the appearance time lags 3~4 days behind the astronomical spring tide of Luzon Strait. There are a total of 88 ISWs recorded at mooring of LH2, including 31 solitons and 57 ISW packets, and the averaged amplitude is 31 m. The daily appearance time for the ISWs concentrates between 4~6 am, 11 am-1 pm and 6~8 pm, and more than 45% of solitons appears between 4~6 am. By tracking the propagation process passed by LH1, LH2 and LH3 of 5 ISWs appeared between 8~12 September, the calculated phase speed for the ISWs is 1.23 m·s^-1 between LH1 and LH2 and 1.77 m·s^-1 between LH2 and LH3, and the theoretical propagation speed is 1.55 m·s^-1 based on the linear wave equation and Kdv equation. The statistical results in this paper further strengthen the understanding of the internal waves in the Liuhua oilfield area on the NSCS under the typical autumn environment.

Key words: Dongsha Plateau, continental slope area, internal tides, internal solitary wave

XIE Botao, HUANG Bigui, YANG Wei, LI Ruixiang, ZHANG Yan, LIU Tongmu, LI Xiangyi. Characteristic statistics and analysis of internal waves in the continental slope area west of the Dongsha Plateau on the northern South China Sea in the autumn of 2021^*[J].Journal of Tropical Oceanography, 2023, 42(6): 29-41.

Figures/Tables 13

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站位	经度	纬度	水深/m	观测设备	观测时段	流速剖面深度范围/m
LH1	115°58.230′E	20°51.605′N	368	300 & 150kHz ADCP	08.28—11.03	12~328
LH2	115°44.422′E	20°42.006′N	378	4300 & 600kHz ADCP 4 SBE37 & 15* SBE 56	08.27—10.29	12~370
LH3	115°34.828′E	20°28.774′N	440	2* 300kHz ADCP	09.02—11.05	12~180

			长轴/(cm·s^-1)	短轴/(cm·s^-1)	倾角/°	相位/°
O₁	正压潮流		3.5	1.6	81	97
	TPXO 7.2		2.3	0.5	19	15
	斜压潮流	25m	21.3	-14.9	137	340
		105m	5.6	-1.4	118	335
		200m	2.0	-1.0	66	25
		300m	13.6	-9.7	116	163
		350m	13.4	-9.5	117	188
K₁	正压潮流		1.1	0.5	142	247
	TPXO 7.2		2.1	0.6	24	59
	斜压潮流	25m	13.3	-10.2	132	127
		105m	1.7	-0.8	96	161
		200m	4.4	-4.2	170	226
		300m	5.8	-5.2	144	312
		350m	5.6	-4.1	112	330
M₂	正压潮流		1.8	0.4	155	194
	TPXO 7.2		2.2	0.7	175	199
	斜压潮流	25m	4.6	-3.0	176	131
		105m	0.5	0.1	61	263
		200m	1.0	-0.2	149	282
		300m	2.2	-1.0	9	149
		350m	1.9	-1.3	136	12
S₂	正压潮流		1.1	0.6	163	232
	TPXO 7.2		1.1	0.6	170	225
	斜压潮流	25m	1.9	-1.7	34	244
		105m	1.6	-0.6	137	43
		200m	0.4	-0.2	156	5
		300m	0.5	-0.2	8	141
		350m	1.4	-0.8	95	316

站位	日期	时间	波致流速/(cm·s^-1)	波致流向/°	持续时间/min
LH1	09-08	03:10	54.3	332	22
	09-09	02:26	58.1	329	20
	09-10	02:50	80.8	332	18
	09-11	04:12	65.3	323	20
	09-12	04:26	46.1	343	20
LH2	09-08	05:26	55.6	325	26
	09-09	04:10	88.0	302	24
	09-10	04:20	64.1	307	22
	09-11	05:28	53.6	300	26
	09-12	05:52	49.7	313	20
LH3	09-08	06:26	83.0	294	30
	09-09	05:26	72.2	269	26
	09-10	05:18	70.1	287	22
	09-11	06:38	64.2	278	20
	09-12	07:04	76.3	293	28

Characteristic statistics and analysis of internal waves in the continental slope area west of the Dongsha Plateau on the northern South China Sea in the autumn of 2021^*

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Characteristic statistics and analysis of internal waves in the continental slope area west of the Dongsha Plateau on the northern South China Sea in the autumn of 2021*

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Characteristic statistics and analysis of internal waves in the continental slope area west of the Dongsha Plateau on the northern South China Sea in the autumn of 2021^*