南极普里兹湾夏季冰间湖沉降通量

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Abstract To understand the biological pump of the Antarctic Ocean, two sets of time-series sediment trap was deployed and recovered in the polynya of the Prydz Bay during the 26^th and 31^st Chinese Antarctic scientific expeditions in the austral summer of 2009~2010 and 2014~2015. The particle fluxes were analyzed. The results showed that the summer fluxes of particulate organic carbon (POC) were 4088.13 and 508.99μmol/(m²·d) for the year of 2009~2010 and 2014~2015, respectively, while biogenic silica (BSi) were 7358.91 and 2034.63 μmol/(m²·d), respectively. The biogenic opal contributed more than 70% of total mass flux in two years, which indicated diatoms should be the dominated species in the column and the main carriers of sinking POC during austral summer. The POC flux in 2014~2015 was only 12.5% of that in 2009~2010. It was mainly due to the lack of ballast matters that prevented the rapid settling of organic matter in the upper layer, resulting in more degrading organic matter in the upper water column caused by heterotrophic microorganisms. Compared with other Antarctic marginal seas where the blooms were not dominated by diatoms, the Prydz Bay polynya is characterized of higher sinking fluxes and efficiency. Estimated by the Martin curve, the 100m POC flux in summer in Prydz Bay averages 8.67% of the net primary productivity. It mainly owed to the diatom-dominated plankton community in the Prydz Bay polynya, therefore the plankton community in polar oceans should attract more attention when predicting the variation of biological pump.

Key words： particle fluxes polynya Prydz Bay biological pump

Received: 07 February 2018

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	HAN Zheng-bing
	SUN Wei-ping
	FAN Gao-jing
	HU Chuan-yu
	PAN Jian-ming
	ZHAO Jun
	ZHANG Hai-feng
	LI Dong
	ZHANG Hai-sheng

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HAN Zheng-bing,SUN Wei-ping,FAN Gao-jing等. Sinking particle fluxes during austral summer in the Prydz Bay polynya, Antarctica[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1923-1934.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1923

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