FN Archimer Export Format
PT J
TI The Novel Hydroxylated Tetraether Index RI‐OH′ as a Sea Surface Temperature Proxy for the 160–45 ka BP Period Off the Iberian Margin
BT 
AF Davtian, Nina
   Bard, Edouard
   Darfeuil, Sophie
   Ménot, Guillemette
   Rostek, Frauke
AS 1:1;2:1;3:1;4:2;5:1;
FF 1:;2:;3:;4:;5:;
C1 CEREGE Aix‐Marseille University CNRS IRD INRAE Coll France Technopôle de l’Arbois Aix‐en‐Provence ,France
   Univ Lyon ENS de Lyon Université Lyon 1 CNRS UMR 5276 LGL‐TPE Lyon, France
C2 UNIV AIX MARSEILLE, FRANCE
   UNIV LYON, FRANCE
IF 3.992
TC 10
UR https://archimer.ifremer.fr/doc/00681/79326/81833.pdf
   https://archimer.ifremer.fr/doc/00681/79326/81834.pdf
   https://archimer.ifremer.fr/doc/00681/79326/81835.xlsx
   https://archimer.ifremer.fr/doc/00681/79326/81836.xlsx
   https://archimer.ifremer.fr/doc/00681/79326/81837.xlsx
   https://archimer.ifremer.fr/doc/00681/79326/81838.xlsx
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   IMAGES V LEG 5
BO Marion Dufresne
DE ;alkenones;GDGTs;RI‐OH;sea surface temperature;TEX86;U-K′(37)
AB RI‐OH′ and RI‐OH (ring index of hydroxylated tetraethers) are two novel organic paleothermometers which could either complement or replace more established paleothermometric proxies, such as UK′37 (C37 ketone unsaturation ratio) and TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms). Despite a few promising attempts, the paleothermometric potential of RI‐OH′ and RI‐OH is not fully constrained. Here we present new high‐resolution temperature records over the 160–45 ka BP (before present = year 1950 CE) period using four organic proxies (RI‐OH′, RI‐OH, TEX86, and UK′37) from three deep sea sediment cores located in a north‐south transect along the Iberian Margin. We analyzed all organic proxies from a single set of lipid extracts to optimize proxy‐proxy comparisons and phase relationship studies. RI‐OH′ responds to Dansgaard‐Oeschger and Heinrich events, better resembles UK′37 than TEX86, and better records the influence of (sub)polar waters during Heinrich events than does RI‐OH. While RI‐OH′ gives realistic sea surface temperatures and latitudinal gradients coherent with those from independent paleothermometers, a more extensive RI‐OH′‐temperature calibration for the North Atlantic is clearly needed. However, the absence of a significant warm bias in RI‐OH′‐based temperatures compared to a shallow sea site suggests that endemic, deep‐dwelling archaeal communities affect TEX86 but not RI‐OH′ in the Iberian Margin. TEX86 leads RI‐OH′ and UK′37 during four Heinrich‐like events, potentially due to background fluxes from deep waters for nonhydroxylated tetraethers summed with primary productivity dependent fluxes from surface waters for all investigated lipid classes. Relationships with Greenland temperatures further support RI‐OH′‐based paleothermometry. 
PY 2021
PD MAR
SO Paleoceanography And Paleoclimatology
SN 2572-4517
PU American Geophysical Union (AGU)
VL 36
IS 3
UT 000635265600014
DI 10.1029/2020PA004077
ID 79326
ER

EF