FN Archimer Export Format
PT J
TI Detailed sedimentary N isotope records from Cariaco Basin for terminations I and V: Local and global implications
BT 
AF MECKLER, A. Nele
   HAUG, Gerald H.
   SIGMAN, Daniel M.
   PLESSEN, Birgit
   PETERSON, Larry C.
   THIERSTEIN, Hans R.
AS 1:1;2:2;3:3;4:2;5:4;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 ETH, Inst Geol, CH-8092 Zurich, Switzerland.
   Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany.
   Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA.
   Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA.
C2 ETH ZURICH, SWITZERLAND
   GFZ GERMAN RES CTR GEOSCI, GERMANY
   UNIV PRINCETON, USA
   UNIV MIAMI, USA
IF 4.335
TC 24
UR https://archimer.ifremer.fr/doc/00233/34457/32869.pdf
LA English
DT Article
CR MD 132 / P.I.C.A.S.S.O.-IMAGES11
BO Marion Dufresne
DE ;Cariaco Basin;N fixation;deglaciation
AB For the last deglaciation and Termination V ( the initiation of MIS 11 at around 430 ka) we report high-resolution sedimentary nitrogen isotope (delta(15)N)records from Cariaco Basin in the Caribbean Sea. During both terminations the previously reported interglacial decrease in delta(15)N clearly lags local changes such as water column anoxia as well as global increases in denitrification by several thousand years. On top of the glacial-interglacial change, several delta(15)N peaks were observed during the last deglaciation. The deglacial signal in Cariaco Basin can be best explained as a combination of (1) local variations in suboxia and water column denitrification as the reason for the millennial-scale peaks, (2) a deglacial maximum in mean ocean nitrate delta(15)N, and (3) increasing N(2) fixation in response to globally increased denitrification causing the overall deglacial delta(15)N decrease. In the Holocene, much of the decrease in delta(15)N occurred between 6 and 3 ka, coinciding with an expected precession-modulated increase in African dust transport to the tropical North Atlantic and the Caribbean. This begs the hypothesis that N(2) fixation in this region increased in response to interglacial maxima in denitrification elsewhere but that this response strengthened with increased mid-Holocene iron input. It remains to be seen whether the data for MIS 11 support this interpretation.
PY 2007
PD DEC
SO Global Biogeochemical Cycles
SN 0886-6236
PU Amer Geophysical Union
VL 21
IS 4/GB4019
UT 000251690700001
BP 1
EP 13
DI 10.1029/2006GB002893
ID 34457
ER

EF