2016年夏季南海海盆水体颗粒物粒径分布特征*

doi:10.11978/2018017

Abstract

Abstract:

Particle size distribution (PSD) describes the relationship between particle concentration and particle size, influencing marine ecosystem environment, the optical properties of sea water, and so on. Based on the in-situ profiles of biological and optical properties during summer 2016 in the South China Sea basin, characterization of PSD was studied. The power-law model was fit to describe the PSD, and the results indicated that the mean coefficient of determination between in-situ PSD and simulated PSD could reach 0.95 in the logarithmic space. The PSD slope (ξ) ranged in [1.27, 7.65] with a mean of 3.93±0.56. The mean of ξ in the surface water of the South China Sea basin was similar to the mean of ξ in global ocean surface water, but higher than that in the surface water of other areas such as the bay. There was a strong negative relationship between ξ and the mean diameter (D_A). Taking section T1 as an example, we analyzed the mean PSD profile of these stations. The features of PSD profiles are as follows. 1) At the surface, there were high values of ξ with low values of D_A because the dominate particle was pico-phytoplankton. 2) The minimum value of ξ appeared in the subsurface chlorophyll maximum layer (SCML) with higher D_A, which may result from the higher proportion of big phytoplankton. 3) In the twilight layer, the values of ξ as well as the values of D_A were between those at the surface and in the SCML. This phenomenon may be related to the process of flocculation, decomposition, and settlement of phytoplankton. The traits of PSD would influence the inherent optical properties (IOP) of seawater. We found that both particulate beam scattering coefficient at 532 nm (b_p(532)) and particulate beam backscattering coefficient at 532 nm (b_bp(532)) would be higher in the SCML because of the increasing chlorophyll-a concentration. However, the lowest mean b_p(532) and the lowest mean b_bp(532) were found in the twilight layer. Furthermore, although the relationship between ξ and the particulate beam attenuation sepctral slope was weak, the model of Boss et al. (2001b) is suitable for estimating the regional range and mean value of ξ roughly.

Key words: South China Sea basin, particle size distribution (PSD), PSD slope, mean diameter, optical properties

CLC Number:

P733.3

Wendi ZHENG, Wen ZHOU, Wenxi CAO, Guifen WANG, Lin DENG, Wenlong XU, Zhantang XU, Cai LI, Jiannan CAI. Characterization of particle size distribution in the South China Sea basin during summer 2016[J].Journal of Tropical Oceanography, 2018, 37(5): 74-85.

Figures/Tables 10

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References 41

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ζ值范围	分层
小于0.5	表层
[0.5, 1.3]	SCML
大于1.3	弱光层

海域		ξ值分布范围	ξ值平均值(±方差)	参考文献
哈德逊湾	表层	2.84~4.46	3.63(±0.40)	Xi et al, 2014
黄、渤海	表层	2.72~4.46	3.64(±0.38)	Qiu et al, 2016
美国东西海岸及南大洋的大西洋区域	表层	2.7~4.7	3.63	Buonassissi et al, 2010
全球大洋(遥感反演)	表层	3.04~5.99	4.22(±0.59)	Kostadinov et al., 2009
南海中部	表层	2.65~6.88	4.54(±0.62)	本文
	SCML	1.27~7.65	3.57(±0.55)
	弱光层	2.67~4.90	3.92(±0.30)
	总体	1.27~7.65	3.93(±0.56)

参数	单位		个数	平均值	最大值	最小值	标准差	变异系数
D_A	μm	表层	881	7.78	123.56	3.23	9.56	122.89
		SCML	1422	25.97	166.07	3.23	24.34	93.72
		弱光层	2573	14.36	111.10	7.22	9.03	62.91
		剖面	4876	16.56	166.07	3.23	16.57	100.07
CHL_LH	mg·m^-3	表层	647	0.17	0.32	0.03	0.06	35.71
		SCML	1289	0.26	0.44	0.11	0.06	24.63
		弱光层	730	0.15	0.33	0.02	0.05	36.38
		剖面	2666	0.21	0.44	0.02	0.08	37.6
$\bar{n}_{p}$	无	表层	621	1.01	1.05	1.002	0.009	0.87
		SCML	1282	1.03	1.16	1.005	0.024	2.34
		弱光层	639	1.06	1.22	1.004	0.044	4.13
		剖面	2542	1.03	1.22	1.002	0.033	3.2
c_p(530)	m^-1	表层	647	0.24	0.41	0.059	0.078	32.02
		SCML	1289	0.20	0.45	3.46×10^-3	0.084	41.92
		弱光层	730	0.08	0.19	5.36×10^-4	0.046	59.01
		剖面	2666	0.18	0.45	5.36×10^-4	0.098	54.88
γ	无	剖面	585	0.86	1.13	0.39	0.12	14.14
b_p(532)	m^-1	表层	647	0.24	0.41	0.062	0.078	32.17
		SCML	1289	0.20	0.45	6.15×10^-3	0.084	41.85
		弱光层	730	0.08	0.19	2.87×10^-4	0.047	59.53
		剖面	2666	0.18	0.45	2.87×10^-4	0.097	54.86
b_bp(532)	m^-1	表层	928	6.37×10^-4	1.13×10^-3	3.8×10^-4	8.84×10^-5	13.88
		SCML	1427	6.59×10^-4	1.08×10^-3	3.45×10^-4	1.17×10^-4	17.67
		弱光层	2616	4.13×10^-4	1.33×10^-3	1.75×10^-4	1.00×10^-4	24.25
		剖面	4971	5.25×10^-4	1.33×10^-3	1.75×10^-4	1.57×10^-4	29.95
$\widetilde{b}_{bp}$	无	表层	628	0.0031	0.01	0.0012	0.001	48.38
		SCML	1289	0.0042	0.11	0.0013	0.004	98.85
		弱光层	729	0.0148	0.56	0.0022	0.038	260.28
		剖面	2646	0.0069	0.56	0.0012	0.021	306.24

Characterization of particle size distribution in the South China Sea basin during summer 2016

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