Distribution of particular biogenic silica and its relationship with nutrients in the upper waters of the Equatorial Pacific

doi:10.3969/j.issn.1001-909X.2014.03.009

Abstract

Abstract: During the Chinese DY20 and DY21 cruises, size-fractionated particulate biogenic silica (PBSi) and nutrients were analyzed for samples at 4 stations in the eastern and western Equatorial Pacific. It showed that the total PBSi concentrations at 4 stations were at a range of 5~65 nmol/ dm³ and its mean value in the eastern Equatorial Pacific was 46 nmol/dm³, which was about 3 times higher than that in the western Equatorial Pacific. PBSi concentrations with the size of 0.8~20 μm accounted for the major contributor of the total PBSi concentrations in the eastern Equatorial Pacific with an average contribution of 64%, while the contributions of two size classes of PBSi concentrations were equal in the western Equatorial Pacific. The results were that the distribution of nutrients had a prominent impact on the concentration and size composition of biogenic silica. And it might be an important factor in controlling the efficiency of biological pump in the Equatorial Ocean by controlling the composition structure of “silica pump”.

Key words: Equatorial Pacific, particulate biogenic silica, nutrients, silica pump

CLC Number:

P734.2

ZHU Qing-mei, ZHUANG Yan-pei, LI Hong-liang, XU Yan-qing, LIU Xi-zhen, ZHANG Jing-jing, WANG Kui, JIN Hai-yan. Distribution of particular biogenic silica and its relationship with nutrients in the upper waters of the Equatorial Pacific[J]. Journal of Marine Sciences, 2014, 32(3): 65-71.

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