南海北部水团及中尺度现象对营养盐时空分布的影响*

doi:10.11978/2022043

Abstract

Abstract:

Temperature, salinity and nutrients were obtained from four seasonal in-field cruises during 2019 on the Northern South China Sea (NSCS). Due to the Pearl River plume and shelf seawater intrusion, nutrients distribution in the nearshore waters of the western Peal River Estuary (PRE) showed remarkable seasonal and regional variations, which was phosphorus limitation in three seasons, especially significant in spring, while showing potential nitrogen limitation in autumn. Influenced by the strength of southwest monsoon and seafloor topography variation, upwelling intensity of the cross-shelf section outside of the PRE (Section A) was greater than that of the cross-shelf section east of Hainan Island (section B) in spring and summer, and climbing height and range of the nutrient contours were greater in summer than that in spring. Nutrients was diluted by the intrusion of Kuroshio water on the slope area of NSCS, the nutrient concentration between 75 to 150 m in winter decreased more than 25% compared with that in summer, while the nutrient concentration near the Dongsha Island of the section A was less than the adjacent stations by above 20% in spring and autumn, since the reduced Kuroshio water intrusion during El Niño. The nutrients in the centre of the cold eddy increased 6.42μmol·L^-1 DIN, 0.71μmol·L^-1 PO₄^3--P and 10.03μmol·L^-1 SiO₃^2--Si, respectively, compared with the adjacent stations outside of the eddy. The concave structure of nutrient distribution in section A was resulted from the co-effects of upwelling and mesoscale eddy in summer. It is summarized that the spatiotemporal variations of nutrient distribution in the NSCS were complicated, mainly effected by the independent or coupled factors including Pearl River plume, coastal upwelling, Kuroshio intrusion and mesoscale eddies.

Keywords northern South China Sea; water mass; mesoscale phenomenon; nutrients; spatiotemporal distributions

ZHANG Jinshang, ZOU Dinghui, MA Yu, LI Ruixiang, LIU Yuqiang, MENG Qiang, LIU Tongmu, SHI Huaming. Effects of water mass and mesoscale phenomenon on the spatiotemporal distributions of nutrients in the northern South China Sea^*[J].Journal of Tropical Oceanography, 2023, 42(1): 168-181.

Figures/Tables 14

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参数		温度/℃	盐度/‰	DIN浓度/(μmol·L^-1)	PO₄^3--P浓度/(μmol·L^-1)	SiO₃^2--Si浓度/(μmol·L^-1)
冬季	变化范围	18.14~19.31	30.57~32.90	3.75~17.28	0.11~0.46	3.98~18.03
冬季	平均值±S.D.	18.68±0.42	31.72±0.80	9.13±4.06	0.25±0.11	9.05±3.62
春季	变化范围	25.78~29.0	28.13~33.70	7.12~15.65	0.01~0.14	1.02~20.09
春季	平均值±S.D.	27.16±1.08	30.94±1.72	10.44±2.49	0.06±0.04	7.04±5.11
夏季	变化范围	23.04~30.67	31.74~34.54	0.98~3.85	0.03~0.34	0.24~9.79
夏季	平均值±S.D.	27.35±2.46	33.61±0.77	1.97±0.82	0.12±0.10	2.94±2.94
秋季	变化范围	24.53~24.89	32.27~33.37	1.20~2.45	0.09~0.18	2.43~6.75
秋季	平均值±S.D.	24.67±0.12	32.75±0.40	1.81±0.38	0.13±0.03	4.51±1.55

参数		温度/℃	盐度/‰	DIN浓度/(μmol·L^-1)	PO₄^3--P浓度/(μmol·L^-1)	SiO₃^2--Si浓度/(μmol·L^-1)
冬季	变化范围	7.71~24.09	31.75~34.76	0.42~31.45	0.02~2.49	0.05~76.16
冬季	平均值±S.D.	16.58±5.49	34.41±0.33	5.61±7.40	0.41±0.59	9.66±16.41
春季	变化范围	8.24~29.54	23.67~34.79	1.02~27.17	0.01~2.46	1.09~67.55
春季	平均值±S.D.	16.90±6.52	34.40±0.49	5.75±6.52	0.35±0.48	9.10±13.07
夏季	变化范围	7.99~30.58	31.68~34.68	1.01~20.33	0.03~2.45	0.11~57.19
夏季	平均值±S.D.	17.26±7.12	34.31±0.45	5.06±4.98	0.49±0.61	8.45±11.62
秋季	变化范围	8.23~26.14	33.53~34.82	1.05~26.19	0.04~2.11	1.61~52.52
秋季	平均值±S.D.	17.87±6.35	34.32±0.27	5.11±6.13	0.40±0.50	8.18±11.37

参数		温度/℃	盐度/‰	DIN浓度/(μmol·L^-1)	PO₄^3--P浓度/(μmol·L^-1)	SiO₃^2--Si浓度/(μmol·L^-1)
冬季	变化范围	7.96~25.59	32.64~34.69	0.36~19.39	0.02~1.62	0.05~51.97
冬季	平均值±S.D.	17.65±5.53	34.36±0.30	3.67±3.87	0.19±0.28	5.05±8.65
春季	变化范围	8.04~30.06	30.09~34.68	1.34~26.72	0.01~2.31	0.82~63.03
春季	平均值±S.D.	18.12±6.79	34.33±0.51	6.05±5.83	0.30±0.43	7.72±12.03
夏季	变化范围	7.90~30.07	33.14~34.65	1.00~19.8	0.01~2.05	0.52~51.44
夏季	平均值±S.D.	17.96±7.02	34.38±0.28	4.43±4.43	0.38±0.49	7.11±10.75
秋季	变化范围	8.87~26.01	32.54~34.62	0.83~24.00	0.05~1.92	1.59~44.39
秋季	平均值±S.D.	19.57±6.15	34.23±0.35	4.21±5.67	0.31±0.44	6.13±8.97

季节	N:P		Si:P		Si:N
季节	变化范围	平均值±S.D.	变化范围	平均值±S.D.	变化范围	平均值±S.D.
冬季	29.3~47.9	36.1±5.4	24.1~49.7	35.8±6.0	0.7~1.3	1.0±0.2
春季	94.0~1324.6	348.3±374.4	30.0~1033.0	233.3±330.3	0.1~1.3	0.6±0.4
夏季	8.5~47.8	23.9±14.1	3.2~41.3	20.6±10.9	0.1~2.6	1.3±0.9
秋季	10.6~21.8	14.4±3.3	20.1~67.6	35.9±13.6	1.4~3.6	2.5±0.8

断面	夏季 A断面	夏季 B断面	春季 A断面	春季 B断面
等密度线起始站位	A1	B1	A3	B4
等密度线两端水深/m	29~56	24~46	59~72	49~46
抬升角度/°	7.5	6.6	6.5	-2.3

Effects of water mass and mesoscale phenomenon on the spatiotemporal distributions of nutrients in the northern South China Sea^*

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Effects of water mass and mesoscale phenomenon on the spatiotemporal distributions of nutrients in the northern South China Sea^*