Cadmium regeneration within the North Atlantic

Saeed Roshan, Jingfeng Wu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Cadmium (Cd) incorporated into the benthic microfossils has been widely used in reconstructing the past water circulation in the North Atlantic. This requires a major control by conservative mixing over regeneration process on the seawater cadmium distribution in the North Atlantic. Through coupling the recently reported Cd data at depths below 300 m with quantitative water mass analysis along the GA03 transect, we tested two models for cadmium cycling within the North Atlantic: conservative mixing alone and conservative mixing plus regeneration which is termed as regenerative mixing. The results show that the regenerative mixing model reproduces the observations (slope = 0.99 and R2 = 0.97) much better than the conservative mixing model (slope = 0.99 and R2 = 0.88). The regenerative mixing model was applied to estimate the amount of dissolved cadmium regenerated "within" the North Atlantic. This regionally regenerated cadmium contributes to ∼10% and >50% of the total cadmium in the North Atlantic at depths >1000 m and 300-1000 m, respectively, indicating that the microfossil-reconstructed seawater Cd can be attributed to the mixing from the South Atlantic to the North Atlantic with high accuracy for depths below 1000 m, while within 300-1000 m cadmium is more controlled by the regeneration process than the mixing process, complicating the attribution of the microfossil-reconstructed seawater Cd to the changes in water mass geometry within this 300-1000 m depth range. A regionally and vertically constant Cd/PO4 3- regeneration ratio ∼262 pM/μmol/kg was derived from the regenerative mixing model which is comparable with ratios estimated in the recent studies for the North Atlantic.

Original languageEnglish (US)
Pages (from-to)2082-2094
Number of pages13
JournalGlobal Biogeochemical Cycles
Volume29
Issue number12
DOIs
StatePublished - Dec 1 2015

Fingerprint

Cadmium
cadmium
regeneration
microfossil
Seawater
seawater
water mass
Water
transect
geometry
Geometry

Keywords

  • dissolved cadmium
  • microfossils Cd/Ca
  • regeneration
  • water mass mixing

ASJC Scopus subject areas

  • Global and Planetary Change
  • Atmospheric Science
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Cadmium regeneration within the North Atlantic. / Roshan, Saeed; Wu, Jingfeng.

In: Global Biogeochemical Cycles, Vol. 29, No. 12, 01.12.2015, p. 2082-2094.

Research output: Contribution to journalArticle

Roshan, Saeed ; Wu, Jingfeng. / Cadmium regeneration within the North Atlantic. In: Global Biogeochemical Cycles. 2015 ; Vol. 29, No. 12. pp. 2082-2094.
@article{043cf7e0bab0402e88b2f1a920d821fd,
title = "Cadmium regeneration within the North Atlantic",
abstract = "Cadmium (Cd) incorporated into the benthic microfossils has been widely used in reconstructing the past water circulation in the North Atlantic. This requires a major control by conservative mixing over regeneration process on the seawater cadmium distribution in the North Atlantic. Through coupling the recently reported Cd data at depths below 300 m with quantitative water mass analysis along the GA03 transect, we tested two models for cadmium cycling within the North Atlantic: conservative mixing alone and conservative mixing plus regeneration which is termed as regenerative mixing. The results show that the regenerative mixing model reproduces the observations (slope = 0.99 and R2 = 0.97) much better than the conservative mixing model (slope = 0.99 and R2 = 0.88). The regenerative mixing model was applied to estimate the amount of dissolved cadmium regenerated {"}within{"} the North Atlantic. This regionally regenerated cadmium contributes to ∼10{\%} and >50{\%} of the total cadmium in the North Atlantic at depths >1000 m and 300-1000 m, respectively, indicating that the microfossil-reconstructed seawater Cd can be attributed to the mixing from the South Atlantic to the North Atlantic with high accuracy for depths below 1000 m, while within 300-1000 m cadmium is more controlled by the regeneration process than the mixing process, complicating the attribution of the microfossil-reconstructed seawater Cd to the changes in water mass geometry within this 300-1000 m depth range. A regionally and vertically constant Cd/PO4 3- regeneration ratio ∼262 pM/μmol/kg was derived from the regenerative mixing model which is comparable with ratios estimated in the recent studies for the North Atlantic.",
keywords = "dissolved cadmium, microfossils Cd/Ca, regeneration, water mass mixing",
author = "Saeed Roshan and Jingfeng Wu",
year = "2015",
month = "12",
day = "1",
doi = "10.1002/2015GB005215",
language = "English (US)",
volume = "29",
pages = "2082--2094",
journal = "Global Biogeochemical Cycles",
issn = "0886-6236",
publisher = "American Geophysical Union",
number = "12",

}

TY - JOUR

T1 - Cadmium regeneration within the North Atlantic

AU - Roshan, Saeed

AU - Wu, Jingfeng

PY - 2015/12/1

Y1 - 2015/12/1

N2 - Cadmium (Cd) incorporated into the benthic microfossils has been widely used in reconstructing the past water circulation in the North Atlantic. This requires a major control by conservative mixing over regeneration process on the seawater cadmium distribution in the North Atlantic. Through coupling the recently reported Cd data at depths below 300 m with quantitative water mass analysis along the GA03 transect, we tested two models for cadmium cycling within the North Atlantic: conservative mixing alone and conservative mixing plus regeneration which is termed as regenerative mixing. The results show that the regenerative mixing model reproduces the observations (slope = 0.99 and R2 = 0.97) much better than the conservative mixing model (slope = 0.99 and R2 = 0.88). The regenerative mixing model was applied to estimate the amount of dissolved cadmium regenerated "within" the North Atlantic. This regionally regenerated cadmium contributes to ∼10% and >50% of the total cadmium in the North Atlantic at depths >1000 m and 300-1000 m, respectively, indicating that the microfossil-reconstructed seawater Cd can be attributed to the mixing from the South Atlantic to the North Atlantic with high accuracy for depths below 1000 m, while within 300-1000 m cadmium is more controlled by the regeneration process than the mixing process, complicating the attribution of the microfossil-reconstructed seawater Cd to the changes in water mass geometry within this 300-1000 m depth range. A regionally and vertically constant Cd/PO4 3- regeneration ratio ∼262 pM/μmol/kg was derived from the regenerative mixing model which is comparable with ratios estimated in the recent studies for the North Atlantic.

AB - Cadmium (Cd) incorporated into the benthic microfossils has been widely used in reconstructing the past water circulation in the North Atlantic. This requires a major control by conservative mixing over regeneration process on the seawater cadmium distribution in the North Atlantic. Through coupling the recently reported Cd data at depths below 300 m with quantitative water mass analysis along the GA03 transect, we tested two models for cadmium cycling within the North Atlantic: conservative mixing alone and conservative mixing plus regeneration which is termed as regenerative mixing. The results show that the regenerative mixing model reproduces the observations (slope = 0.99 and R2 = 0.97) much better than the conservative mixing model (slope = 0.99 and R2 = 0.88). The regenerative mixing model was applied to estimate the amount of dissolved cadmium regenerated "within" the North Atlantic. This regionally regenerated cadmium contributes to ∼10% and >50% of the total cadmium in the North Atlantic at depths >1000 m and 300-1000 m, respectively, indicating that the microfossil-reconstructed seawater Cd can be attributed to the mixing from the South Atlantic to the North Atlantic with high accuracy for depths below 1000 m, while within 300-1000 m cadmium is more controlled by the regeneration process than the mixing process, complicating the attribution of the microfossil-reconstructed seawater Cd to the changes in water mass geometry within this 300-1000 m depth range. A regionally and vertically constant Cd/PO4 3- regeneration ratio ∼262 pM/μmol/kg was derived from the regenerative mixing model which is comparable with ratios estimated in the recent studies for the North Atlantic.

KW - dissolved cadmium

KW - microfossils Cd/Ca

KW - regeneration

KW - water mass mixing

UR - http://www.scopus.com/inward/record.url?scp=84955349880&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84955349880&partnerID=8YFLogxK

U2 - 10.1002/2015GB005215

DO - 10.1002/2015GB005215

M3 - Article

AN - SCOPUS:84955349880

VL - 29

SP - 2082

EP - 2094

JO - Global Biogeochemical Cycles

JF - Global Biogeochemical Cycles

SN - 0886-6236

IS - 12

ER -