Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean
National Basic Research Program of China (973 Program) [2009CB421201, 2009CB421206]; National Science Foundation of China (NSFC) [40821063, 90711005]; South China Sea Institute of Oceanology, the Chinese Academy of Sciences Variations in seawater-dissolved calcium ion (Ca2+) are small but substantia...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2011
|
Subjects: | |
Online Access: | http://dspace.xmu.edu.cn/handle/2288/60245 |
id |
ftxiamenuniv:oai:dspace.xmu.edu.cn:2288/60245 |
---|---|
record_format |
openpolar |
spelling |
ftxiamenuniv:oai:dspace.xmu.edu.cn:2288/60245 2023-05-15T17:35:41+02:00 Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean Cao, Zhimian Dai, Minhan 戴民汉 2011-06-02 http://dspace.xmu.edu.cn/handle/2288/60245 en_US eng Global Biogeochemical Cycles, 2011,25 0886-6236 WOS:000291313200001 http://dspace.xmu.edu.cn/handle/2288/60245 http://dx.doi.org/10.1029/2009GB003690 CHEMICAL LYSOCLINE CARBON-CYCLE TITRATION ALKALINITY INORGANIC CARBON ATMOSPHERIC CO2 NORTH-ATLANTIC TIME-SERIES FLUXES WATER CALCIFICATION Article 2011 ftxiamenuniv 2020-07-21T11:32:00Z National Basic Research Program of China (973 Program) [2009CB421201, 2009CB421206]; National Science Foundation of China (NSFC) [40821063, 90711005]; South China Sea Institute of Oceanology, the Chinese Academy of Sciences Variations in seawater-dissolved calcium ion (Ca2+) are small but substantial, which provides information essential to establish the oceanic calcium carbonate (CaCO3) dissolution flux. In this study, high-precision data of Ca2+ were collected in the South China Sea (SCS), the largest marginal sea of the western North Pacific, and its precursor, the West Philippine Sea (WPS), on the basis of two cruises conducted in 2007 and in 2008. An excess Ca2+ of 13 +/- 5 mmol kg(-1) was observed in the SCS subsurface water at 200-800 m relative to the WPS, and we suggest that such an excess is attributed to in situ CaCO3 dissolution at a rate of similar to 0.5 mmol m(-2) d(-1) in the SCS shallow subsurface water. Through subsurface water outflow, this shallow-depth CaCO3 dissolution may provide a Ca2+ export flux of (0.8 +/- 0.3) x 10(12) mol yr(-1) from the SCS to the WPS, establishing it as an important Ca2+ source from the SCS to the interior Pacific Ocean. This study indicates, for the first time, that along with the benthic processes, CaCO3 dissolution in waters at shallow depth in marginal seas could also contribute to Ca2+ and total alkalinity accumulations in the upper layer of the open ocean, which would ultimately enhance the buffer capacity of the world ocean in the context of rising anthropogenic CO2. Article in Journal/Newspaper North Atlantic Xiamen University Institutional Repository Pacific |
institution |
Open Polar |
collection |
Xiamen University Institutional Repository |
op_collection_id |
ftxiamenuniv |
language |
English |
topic |
CHEMICAL LYSOCLINE CARBON-CYCLE TITRATION ALKALINITY INORGANIC CARBON ATMOSPHERIC CO2 NORTH-ATLANTIC TIME-SERIES FLUXES WATER CALCIFICATION |
spellingShingle |
CHEMICAL LYSOCLINE CARBON-CYCLE TITRATION ALKALINITY INORGANIC CARBON ATMOSPHERIC CO2 NORTH-ATLANTIC TIME-SERIES FLUXES WATER CALCIFICATION Cao, Zhimian Dai, Minhan 戴民汉 Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean |
topic_facet |
CHEMICAL LYSOCLINE CARBON-CYCLE TITRATION ALKALINITY INORGANIC CARBON ATMOSPHERIC CO2 NORTH-ATLANTIC TIME-SERIES FLUXES WATER CALCIFICATION |
description |
National Basic Research Program of China (973 Program) [2009CB421201, 2009CB421206]; National Science Foundation of China (NSFC) [40821063, 90711005]; South China Sea Institute of Oceanology, the Chinese Academy of Sciences Variations in seawater-dissolved calcium ion (Ca2+) are small but substantial, which provides information essential to establish the oceanic calcium carbonate (CaCO3) dissolution flux. In this study, high-precision data of Ca2+ were collected in the South China Sea (SCS), the largest marginal sea of the western North Pacific, and its precursor, the West Philippine Sea (WPS), on the basis of two cruises conducted in 2007 and in 2008. An excess Ca2+ of 13 +/- 5 mmol kg(-1) was observed in the SCS subsurface water at 200-800 m relative to the WPS, and we suggest that such an excess is attributed to in situ CaCO3 dissolution at a rate of similar to 0.5 mmol m(-2) d(-1) in the SCS shallow subsurface water. Through subsurface water outflow, this shallow-depth CaCO3 dissolution may provide a Ca2+ export flux of (0.8 +/- 0.3) x 10(12) mol yr(-1) from the SCS to the WPS, establishing it as an important Ca2+ source from the SCS to the interior Pacific Ocean. This study indicates, for the first time, that along with the benthic processes, CaCO3 dissolution in waters at shallow depth in marginal seas could also contribute to Ca2+ and total alkalinity accumulations in the upper layer of the open ocean, which would ultimately enhance the buffer capacity of the world ocean in the context of rising anthropogenic CO2. |
format |
Article in Journal/Newspaper |
author |
Cao, Zhimian Dai, Minhan 戴民汉 |
author_facet |
Cao, Zhimian Dai, Minhan 戴民汉 |
author_sort |
Cao, Zhimian |
title |
Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean |
title_short |
Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean |
title_full |
Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean |
title_fullStr |
Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean |
title_full_unstemmed |
Shallow-depth CaCO(3) dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean |
title_sort |
shallow-depth caco(3) dissolution: evidence from excess calcium in the south china sea and its export to the pacific ocean |
publishDate |
2011 |
url |
http://dspace.xmu.edu.cn/handle/2288/60245 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
http://dx.doi.org/10.1029/2009GB003690 |
op_relation |
Global Biogeochemical Cycles, 2011,25 0886-6236 WOS:000291313200001 http://dspace.xmu.edu.cn/handle/2288/60245 |
_version_ |
1766134919977762816 |