The University of Southampton
University of Southampton Institutional Repository

Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific

Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific
Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific
The distributions of biogenic and lithogenic silica concentrations and net silica production rates in the upper 120 m of the Eastern Equatorial Pacific (EEP) were examined in December 2004, on two transects situated at 110°W (4°N to 3°S) and along the equator (110°W to 140°W). Lithogenic silica (lSiO2) was generally <10 nmol Si l?1 with maximum concentrations reaching 25 nmol l?1 in surface waters. These low concentrations confirm low atmospheric inputs of particulate Si, consistent with reported low inputs of wind-borne material in the EEP. In spite of active upwelling of silicic acid-rich waters the biogenic silica (bSiO2) concentrations were generally low, falling between 100 and 180 nmol Si l?1 in the upper 50 m and decreasing to less than 50 nmol Si l?1 below not, vert, similar90 m. Estimates of net bSiO2 production rates revealed that the rate of production exceeded that of dissolution in the upper euphotic layer (0-40 m) along 110°W with net production extending somewhat deeper (60-100 m) to the west along the equator. Net production rates in the surface layer were low, ranging between 5 and 40 nmol Si l?1 d?1, consistent with previous observations that diatoms are small contributors to autotrophic biomass in the EEP. Net silica dissolution predominated in the lower euphotic layer (40-120 m), indicating active Si recycling which diminished the strength of the silica pump in this region.
The Eastern Equatorial Pacific, Biogenic Silica, Lithogenic Silica, Silicate, Silica net production or dissolution, Si recycling
0967-0645
449-461
Adjou, Mohamed
bacef291-b0a5-41a9-9ad2-69469ee498db
Tréguer, Paul
b5161d23-42a4-4e08-a3d4-a2d22b28766f
Dumousseaud, Cynthia
31cc4879-0d45-4674-8eba-93105ee25c2e
Corvaisier, Rudolph
0e7ff8c2-289b-4e5a-8056-71ee851bd033
Brzezinski, Mark A.
9d492cdc-c042-4e03-a95c-413306b28874
Nelson, David M.
10949db8-c5d3-4ffe-b8f6-60febec6ae95
Adjou, Mohamed
bacef291-b0a5-41a9-9ad2-69469ee498db
Tréguer, Paul
b5161d23-42a4-4e08-a3d4-a2d22b28766f
Dumousseaud, Cynthia
31cc4879-0d45-4674-8eba-93105ee25c2e
Corvaisier, Rudolph
0e7ff8c2-289b-4e5a-8056-71ee851bd033
Brzezinski, Mark A.
9d492cdc-c042-4e03-a95c-413306b28874
Nelson, David M.
10949db8-c5d3-4ffe-b8f6-60febec6ae95

Adjou, Mohamed, Tréguer, Paul, Dumousseaud, Cynthia, Corvaisier, Rudolph, Brzezinski, Mark A. and Nelson, David M. (2011) Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific. Deep Sea Research Part II: Topical Studies in Oceanography, 58 (3-4), 449-461. (doi:10.1016/j.dsr2.2010.08.002).

Record type: Article

Abstract

The distributions of biogenic and lithogenic silica concentrations and net silica production rates in the upper 120 m of the Eastern Equatorial Pacific (EEP) were examined in December 2004, on two transects situated at 110°W (4°N to 3°S) and along the equator (110°W to 140°W). Lithogenic silica (lSiO2) was generally <10 nmol Si l?1 with maximum concentrations reaching 25 nmol l?1 in surface waters. These low concentrations confirm low atmospheric inputs of particulate Si, consistent with reported low inputs of wind-borne material in the EEP. In spite of active upwelling of silicic acid-rich waters the biogenic silica (bSiO2) concentrations were generally low, falling between 100 and 180 nmol Si l?1 in the upper 50 m and decreasing to less than 50 nmol Si l?1 below not, vert, similar90 m. Estimates of net bSiO2 production rates revealed that the rate of production exceeded that of dissolution in the upper euphotic layer (0-40 m) along 110°W with net production extending somewhat deeper (60-100 m) to the west along the equator. Net production rates in the surface layer were low, ranging between 5 and 40 nmol Si l?1 d?1, consistent with previous observations that diatoms are small contributors to autotrophic biomass in the EEP. Net silica dissolution predominated in the lower euphotic layer (40-120 m), indicating active Si recycling which diminished the strength of the silica pump in this region.

Full text not available from this repository.

More information

Published date: 2011
Keywords: The Eastern Equatorial Pacific, Biogenic Silica, Lithogenic Silica, Silicate, Silica net production or dissolution, Si recycling

Identifiers

Local EPrints ID: 176519
URI: https://eprints.soton.ac.uk/id/eprint/176519
ISSN: 0967-0645
PURE UUID: 90bf7050-3777-44cc-b0d0-c71df686cc3e

Catalogue record

Date deposited: 08 Mar 2011 09:44
Last modified: 18 Jul 2017 12:08

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×