Assessment of C, N, and Si Isotopes as Tracers of Past Ocean Nutrient and Carbon Cycling
Jesse R. Farmer
(1)
,
J. E. Hertzberg
(2)
,
Damien Cardinal
(3)
,
S. Fietz
(4)
,
K. Hendry
(5)
,
S. L. Jaccard
(6)
,
A. Paytan
(7)
,
P. A. Rafter
(8)
,
H. Ren
(9)
,
C. J. Somes
(10)
,
Jill Sutton
(11)
1
Department of Geosciences [Princeton]
2 International Ocean Discovery Program
3 CYBIOM - Cycles biogéochimiques marins : processus et perturbations
4 Department of Earth Sciences [Stellenbosch]
5 School of Earth Sciences [Bristol]
6 OCCR - Oeschger Centre for Climate Change Research
7 UC Santa Cruz - University of California [Santa Cruz]
8 ESS - Department of Earth System Science [Irvine]
9 NTU - National Taiwan University [Taiwan]
10 GEOMAR - Helmholtz Centre for Ocean Research [Kiel]
11 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
2 International Ocean Discovery Program
3 CYBIOM - Cycles biogéochimiques marins : processus et perturbations
4 Department of Earth Sciences [Stellenbosch]
5 School of Earth Sciences [Bristol]
6 OCCR - Oeschger Centre for Climate Change Research
7 UC Santa Cruz - University of California [Santa Cruz]
8 ESS - Department of Earth System Science [Irvine]
9 NTU - National Taiwan University [Taiwan]
10 GEOMAR - Helmholtz Centre for Ocean Research [Kiel]
11 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
Damien Cardinal
- Fonction : Auteur
- PersonId : 184611
- IdHAL : damien-cardinal
- ORCID : 0000-0003-1238-8412
- IdRef : 119090988
Jill Sutton
- Fonction : Auteur
- PersonId : 175356
- IdHAL : jill-sutton
- ORCID : 0000-0003-3664-5049
Résumé
Biological productivity in the ocean directly influences the partitioning of carbon between the atmosphere and ocean interior. Through this carbon cycle feedback, changing ocean productivity has long been hypothesized as a key pathway for modulating past atmospheric carbon dioxide levels and hence global climate. Because phytoplankton preferentially assimilate the light isotopes of carbon and the major nutrients nitrate and silicic acid, stable isotopes of carbon (C), nitrogen (N), and silicon (Si) in seawater and marine sediments can inform on ocean carbon and nutrient cycling, and by extension the relationship with biological productivity and global climate. Here, we compile water column C, N, and Si stable isotopes from GEOTRACES-era data in four key ocean regions to review geochemical proxies of oceanic carbon and nutrient cycling based on the C, N, and Si isotopic composition of marine sediments. External sources and sinks as well as internal cycling (including assimilation, particulate matter export, and regeneration) are discussed as likely drivers of observed C, N, and Si isotope distributions in the ocean. The potential for C, N, and Si isotope measurements in sedimentary archives to record aspects of past ocean C and nutrient cycling is evaluated, along with key uncertainties and limitations associated with each proxy. Constraints on ocean C and nutrient cycling during late Quaternary glacial-interglacial cycles and over the Cenozoic are examined. This review highlights opportunities for future research using multielement stable isotope proxy applications and emphasizes the importance of such applications to reconstructing past changes in the oceans and climate system.
Format du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Assessment of C, N, and Si Isotopes as Tracers of Past Ocean Nutrient and Carbon Cycling
|
Résumé |
en
Biological productivity in the ocean directly influences the partitioning of carbon between the atmosphere and ocean interior. Through this carbon cycle feedback, changing ocean productivity has long been hypothesized as a key pathway for modulating past atmospheric carbon dioxide levels and hence global climate. Because phytoplankton preferentially assimilate the light isotopes of carbon and the major nutrients nitrate and silicic acid, stable isotopes of carbon (C), nitrogen (N), and silicon (Si) in seawater and marine sediments can inform on ocean carbon and nutrient cycling, and by extension the relationship with biological productivity and global climate. Here, we compile water column C, N, and Si stable isotopes from GEOTRACES-era data in four key ocean regions to review geochemical proxies of oceanic carbon and nutrient cycling based on the C, N, and Si isotopic composition of marine sediments. External sources and sinks as well as internal cycling (including assimilation, particulate matter export, and regeneration) are discussed as likely drivers of observed C, N, and Si isotope distributions in the ocean. The potential for C, N, and Si isotope measurements in sedimentary archives to record aspects of past ocean C and nutrient cycling is evaluated, along with key uncertainties and limitations associated with each proxy. Constraints on ocean C and nutrient cycling during late Quaternary glacial-interglacial cycles and over the Cenozoic are examined. This review highlights opportunities for future research using multielement stable isotope proxy applications and emphasizes the importance of such applications to reconstructing past changes in the oceans and climate system.
|
Auteur(s) |
Jesse R. Farmer
1
, J. E. Hertzberg
2
, Damien Cardinal
3
, S. Fietz
4
, K. Hendry
5
, S. L. Jaccard
6
, A. Paytan
7
, P. A. Rafter
8
, H. Ren
9
, C. J. Somes
10
, Jill Sutton
11
1
Department of Geosciences [Princeton]
( 104810 )
- Princeton University, Guyot Hall, Princeton, NJ 08544-1013
- États-Unis
2
International Ocean Discovery Program
( 561422 )
- College Station, TX
- États-Unis
3
CYBIOM -
Cycles biogéochimiques marins : processus et perturbations
( 541829 )
- France
4
Department of Earth Sciences [Stellenbosch]
( 204436 )
- Stellenbosch University, Matieland, South Africa
- Afrique du Sud
5
School of Earth Sciences [Bristol]
( 121406 )
- Wills Memorial Building, Queens Road, Bristol BS8 1RJ
- Royaume-Uni
6
OCCR -
Oeschger Centre for Climate Change Research
( 79948 )
- Zähringerstrasse 25, CH-3012 Bern
- Suisse
7
UC Santa Cruz -
University of California [Santa Cruz]
( 111021 )
- 1156 High Street, Santa Cruz, Ca 95064
- États-Unis
8
ESS -
Department of Earth System Science [Irvine]
( 84055 )
- 3317 Croul Hall, University of California, Irvine, CA 92697-3100
- États-Unis
9
NTU -
National Taiwan University [Taiwan]
( 110803 )
- No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan
- Taïwan
10
GEOMAR -
Helmholtz Centre for Ocean Research [Kiel]
( 446053 )
- Wischhofstr. 1-3, 24148 Kiel
- Allemagne
11
LEMAR -
Laboratoire des Sciences de l'Environnement Marin (LEMAR)
( 81089 )
- IUEM Technopôle Brest-Iroise - rue Dumont d'Urville - 29280 Plouzané - FRANCE
- France
|
Nom de la revue |
|
Page/Identifiant |
e2020GB006775
|
Licence |
Paternité - Pas d'utilisation commerciale - Pas de modification
|
Langue du document |
Anglais
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2021-07
|
Volume |
35
|
Numéro |
7
|
Domaine(s) |
|
DOI | 10.1029/2020gb006775 |
UT key WOS | 000677815700008 |
Origine :
Publication financée par une institution
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