FN Archimer Export Format
PT J
TI Sea surface temperature proxies (alkenones, foraminiferal Mg/Ca, and planktonic foraminiferal assemblage) and their implications in the Okinawa Trough
BT 
AF KIM, Ryoung Ah
   LEE, Kyung Eun
   BAE, Si Woong
AS 1:1;2:1;3:1;
FF 1:;2:;3:;
C1 Korea Maritime & Ocean Univ, Ocean Sci & Technol Sch, Busan 606791, South Korea.
C2 UNIV KOREA MARITIME & OCEAN, SOUTH KOREA
IN DOAJ
IF 2.481
TC 16
UR https://archimer.ifremer.fr/doc/00353/46417/46156.pdf
LA English
DT Article
CR IMAGES 4-MD111
   MD 122 / WEPAMA
BO Marion Dufresne
DE ;Sea surface temperature;Okinawa Trough;Alkenone;Planktonic foraminiferal Mg/Ca ratio;Planktonic foraminiferal assemblages
AB We reviewed three sea surface temperature (SST) proxies in the Okinawa Trough (OT): alkenones, planktonic foraminiferal Mg/Ca, and planktonic foraminiferal assemblages. The seasonal and vertical distribution patterns of each proxy-related organism in the water column were reviewed to confirm the applicability of each proxy. In addition, current SSTs (Japan Oceanographic Data Center dataset from 1906 to 2003) were compared with core-top sediment temperatures reconstructed using the proxies. Temperatures calculated using the alkenone unsaturation index represent annual mean SSTs, and temperatures calculated using Mg/Ca of Globigerinoides ruber capture summer to autumn (June-November) SSTs. Core-top August SSTs calculated from planktonic foraminiferal assemblages corresponded well with the observed SSTs, but core-top February temperatures were similar to 3.6 degrees C warmer than the observed SSTs. SST proxy estimates from marine sediments dating back to the late Holocene (0-3 cal ky BP) and the last glacial maximum (18-21 cal ky BP) were compared. Comparisons between proxy SST estimates show that foraminiferal assemblage-based August SSTs were the warmest. Alkenone-based temperature estimates were lower than Mg/Ca-based temperature estimates, probably because the alkenone-based temperature represents the annual mean temperature, whereas the Mg/Ca-based temperature represents the summer-autumn mean temperature. February assemblage SSTs seem to be greatly affected by the statistical technique and/or database used. These results suggest that seasonality should be considered in past SST reconstruction using alkenone and Mg/Ca in the OT. The planktonic foraminiferal assemblage technique does not appear to be promising with respect to accurately reconstructing past SSTs (especially winter) in the OT. Habitat depth may not be an issue because both alkenone producers and G. ruber live at the upper surface mixed layer in the area. Glacial-interglacial changes in the surface hydrography of the OT reconstructed based on the SST and salinity proxies were also reviewed here. The surface hydrography of the OT has been influenced by changes in the Kuroshio Current and the East Asian monsoon system during the late Quaternary. Comparisons of the hydrography records from the OT with records of stalagmites in China, the Tropical Pacific, and the North Atlantic show that there is a teleconnection between them.
PY 2015
PD DEC
SO Progress In Earth And Planetary Science
SN 2197-4284
PU Springer
VL 2
IS 43
UT 000381920200001
BP 1
EP 16
DI 10.1186/s40645-015-0074-1
ID 46417
ER

EF