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PT J
TI Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and pCO(2) gradients
BT 
AF GUILLERMIC, Maxence
   MISRA, Sambuddha
   EAGLE, Robert
   VILLA, Alexandra
   CHANG, Fengming
   TRIPATI, Aradhna
AS 1:1,2;2:3,4;3:1,2;4:1,5;5:6;6:1,2;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Dept Atmospher & Ocean Sci, Inst Environm & Sustainabil, Los Angeles, CA 90095 USA.
   Inst Univ Europeen Mer, UBO, Lab Geosci Ocean, UMR6538, Rue Dumont dUrville, F-29280 Plouzane, France.
   Indian Inst Sci, Ctr Earth Sci, Bengaluru 560012, Karnataka, India.
   Univ Cambridge, Dept Earth Sci, Godwin Lab Palaeoclimate Res, Cambridge, England.
   Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA.
   Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China.
C2 UNIV CALIF LOS ANGELES, USA
   UBO, FRANCE
   INDIAN INST SCI, INDIA
   UNIV CAMBRIDGE, UK
   UNIV WISCONSIN, USA
   CHINESE ACAD SCI, CHINA
UM LGO
IN DOAJ
IF 4.295
TC 6
UR https://archimer.ifremer.fr/doc/00687/79861/82712.pdf
   https://archimer.ifremer.fr/doc/00687/79861/82713.pdf
   https://archimer.ifremer.fr/doc/00687/79861/82714.pdf
   https://archimer.ifremer.fr/doc/00687/79861/82715.pdf
LA English
DT Article
AB Boron isotope systematics of planktonic foraminifera from core-top sediments and culture experiments have been studied to investigate the sensitivity of delta B-11 of calcite tests to seawater pH. However, our knowledge of the relationship between delta B-11 and pH remains incomplete for many taxa. Thus, to expand the potential scope of application of this proxy, we report delta B-11 data for seven different species of planktonic foraminifera from sediment core tops. We utilize a method for the measurement of small samples of foraminifera and calculate the delta B-11-calcite sensitivity to pH for Globigerinoides ruber, Trilobus sacculifer (sacc or without sacc), Orbulina universa, Pulleniatina obliquiloculata, Neogloboquadrina dutertrei, Globorotalia menardii, and Globorotalia tumida, including for unstudied core tops and species. These taxa have diverse ecological preferences and are from sites that span a range of oceanographic regimes, including some that are in regions of air-sea equilibrium and others that are out of equilibrium with the atmosphere. The sensitivity of delta(11)B(carbonate )to delta B-11(borate) (e.g., Delta delta B-11(carbonate)/Delta delta B-11(borate)) in core tops is consistent with previous studies for T. sacculifer and G. ruber and close to unity for N. dutertrei, O. universa, and combined deep-dwelling species. Deep-dwelling species closely follow the core-top calibration for O. universa, which is attributed to respiration-driven microenvironments likely caused by light limitation and/or symbiont-host interactions. Our data support the premise that utilizing boron isotope measurements of multiple species within a sediment core can be utilized to constrain vertical profiles of pH and pCO(2) at sites spanning different oceanic regimes, thereby constraining changes in vertical pH gradients and yielding insights into the past behavior of the oceanic carbon pumps. 
PY 2020
PD JUN
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 17
IS 13
UT 000548520500002
BP 3487
EP 3510
DI 10.5194/bg-17-3487-2020
ID 79861
ER

EF