夏季南海北部浮游植物对上升流与羽状流的响应

doi:10.11978/2018001

Abstract

Abstract:

A coupled physical-biological 3D model was established, which is forced by realistic forcing, to quantify the effects and underlying mechanisms of upwelling and river plume on the spatial distribution of phytoplankton biomass during summer in the northern South China sea (NSCS). The model was validated by using cruise data of 2006 and 2008 and remote-sensing observations from 2006 to 2008. The results suggest that the model satisfactorily captures the processes of coastal upwelling and river plume dynamics that determine phytoplankton distribution. Model results indicate that summer phytoplankton in the NSCS were mainly distributed within 50m isobath. In Qiongdong and Shantou, phytoplankton distributed evenly. Upwelling processes accounted for up to 90% of the biomass, and horizontal advection in the upper layer was the main sink, while biological processes were the main sources for the phytoplankton biomass. In the Pearl River and Shanwei, phytoplankton shows surface and subsurface maxima: the river plume contributed 35%~40% (mainly to the upper layer) of the phytoplankton biomass, and upwelling contributed 60%~65% (mainly to the middle and bottom layers). In Yuexi, the phytoplankton biomass was extremely low in the upper layer, and mainly distributed in the middle and bottom layers; in total, upwelling contributed 92% of phytoplankton biomass. In the NSCS, both upwelling and river plume processes stimulated phytoplankton through nutrient supply. In the upwelling process, nutrient supply reflected the combination of along- and across-shore nutrient transports. The thermocline, which alters vertical nutrient transfer, is the key factor affecting the variable contributions of upwelling and river plume processes for phytoplankton in different layers. Overall, the spatial variation of summer phytoplankton is mainly driven by upwelling and river plume processes, and by the circulation-nutrient-biological coupling effect.

Key words: physical-biological coupled model, phytoplankton, upwelling, river plume, northern South China Sea.

CLC Number:

P735.121

Zeting XU, Shiyu LI, Jiatang HU, Siying WANG, Bin WANG, Mingxian GUO, Bingxu GENG. Summer phytoplankton responses to upwelling and river plume in northern South China Sea[J].Journal of Tropical Oceanography, 2018, 37(6): 92-103.

Figures/Tables 11

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验证指标	2006—2008年遥感数据				2006年大面站				2008年大面站
验证指标	Bias	RMSE	R	RE/%	Bias	RMSE	R	RE/%	Bias	RMSE	R	RE/%
海表温度	-0.02	0.28	0.90	0.06	1.03	0.52	0.39	1.77	0.54	1.18	0.84	1.99
海表盐度	—	—	—	—	3.56	-1.51	0.85	4.73	0.59	2.04	0.60	1.86
海表叶绿素	-0.13	1.08	0.75	17.92	—	—	—	—	-0.25	1.78	0.46	14.88

Summer phytoplankton responses to upwelling and river plume in northern South China Sea

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