Pore-water distribution and quantification of diffusive benthic fluxes of silicic acid, nitrate and phosphate in surface sediments of the deep Arabian Sea

被引：36

作者：

Grandel, S ^{[1
]}

Rickert, D ^{[1
]}

Schlüter, M ^{[1
]}

Wallmann, K ^{[1
]}

机构：

[1] GEOMAR Res Ctr, Dept Environm Geol, D-24148 Kiel, Germany

来源：

DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY | 2000年 / 47卷 / 14期

关键词：

D O I：

10.1016/S0967-0645(00)00046-1

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

Benthic fluxes and pore-water compositions of silicic acid, nitrate and phosphate were investigated for surface sediments of the abyssal Arabian Sea during four cruises (1995-1998). Five sites located in the northern (NAST), western (WAST), central (CAST), eastern (EAST), and southern (SAST) Arabian Sea were revisited during intermonsoonal periods after the NE- and SW-Monsoon. Al these sites, benthic fluxes of remineralized nutrients From the sediment to the bottom water of 36-106, 102-350 and 4-16 mmol m(-2) yr(-1) were measured for nitrate, silicic acid and phosphate, respectively. The benthic fluxes and Fore-water compositions showed a distinct regional pattern. Highest fluxes were observed in the western and northern region of the Arabian Sea, whereas decreasing fluxes were derived towards the southeast. At WAST, the general temporal pattern of primary production, related to the NE- and SW-Monsoon, is reflected by benthic fluxes. In contrast, at sites NAST, SAST, CAST, and EAST a temporal pattern of fluxes in response to the monsoon is not obvious. Our results reveal a clear coupling between the general regional pattern of production in surface waters and the response of the benthic environment, as indicated by the flux of remineralized nutrients, though a spatially differing degree of decoupling during transport and remineralization of particulate organic matter and biogenic opal was observed. This has to be taken into account regarding budget calculations and paleoceanographic topics. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：2707 / 2734

页数：28

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