DOI: 10.1016/j.quascirev.2019.01.012
Scopus记录号: 2-s2.0-85061297349
论文题名: Upregulation of phytoplankton carbon concentrating mechanisms during low CO 2 glacial periods and implications for the phytoplankton pCO 2 proxy
作者: Stoll H.M. ; Guitian J. ; Hernandez-Almeida I. ; Mejia L.M. ; Phelps S. ; Polissar P. ; Rosenthal Y. ; Zhang H. ; Ziveri P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 208 起始页码: 1
结束页码: 20
语种: 英语
Scopus关键词: Calcite
; Carbon dioxide
; Glacial geology
; Growth rate
; Isotopes
; Phytoplankton
; Regression analysis
; Tropics
; Carbon-concentrating mechanism
; Dissolved inorganic carbon
; Experimental cultures
; Glacial-interglacial cycles
; Isotope fractionation
; Multilinear regression model
; Stable isotopic fractionation
; Statistical modeling
; Carbon
; alga
; alkenone
; carbon
; carbon dioxide
; Cenozoic
; coccolith
; diatom
; dissolved inorganic carbon
; foraminifera
; glacial-interglacial cycle
; isotopic fractionation
; Neogene
; photosynthesis
; phytoplankton
; stable isotope
; algae
; Bacillariophyta
; Foraminifera
; Haptophyceae
英文摘要: Published alkenone ε p records spanning known glacial pCO 2 cycles show considerably less variability than predicted by the diffusive model for cellular carbon acquisition and isotope fractionation. We suggest this pattern is consistent with a systematic cellular enhancement of the carbon supply to photosynthesis via carbon concentrating mechanisms under the case of carbon limitation during low pCO 2 glacial time periods, an effect also manifest under carbon limitation in experimental cultures of coccolithophores as well as diatoms. While the low-amplitude ε p signal over glacial pCO 2 cycles has led some to question the reliability of ε p for reconstructing long-term pCO 2 , the [CO 2 ] aq in the tropical oceans during glacial pCO 2 minima represents the most extreme low CO 2 conditions likely experienced by phytoplankton in the Cenozoic, and the strongest upregulation of carbon concentrating mechanisms. Using a statistical multilinear regression model, we quantitatively parse out the factors (namely light, growth rate, and [CO 2 ] aq ), that contribute to variation in ε p in alkenone-producing algae, which confirms a much smaller dependence of ε p on [CO 2 ] aq in the low [CO 2 ] aq range, than inferred from the hyperbolic form of the diffusive model. Application of the new statistical model to two published tropical ε p records spanning the late Neogene produces much more dynamic pCO 2 estimates than the conventional diffusive model and reveals a significant pCO 2 decline over the last 15 Ma, which is broadly consistent with recent results from boron isotopes of foraminifera. The stable isotopic fractionation between coccolith calcite and seawater dissolved inorganic carbon (here Δ coccolith-DIC ) also shows systematic variations over glacial-interglacial cycles which may, following future experimental constraints, help estimate the degree of upregulation of parts of the algal carbon concentrating mechanism over glacial cycles. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117368
Appears in Collections: 气候变化与战略
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Recommended Citation:
Stoll H.M.,Guitian J.,Hernandez-Almeida I.,et al. Upregulation of phytoplankton carbon concentrating mechanisms during low CO 2 glacial periods and implications for the phytoplankton pCO 2 proxy[J]. Quaternary Science Reviews,2019-01-01,208