Kuroshio-Oyashio Transition Area 40KYr Alkenone SST Estimates Harada, N.; Ahagon, N.; Uchida, M.; Murayama, M. Harada, N. Ahagon, N. Uchida, M. Murayama, M. earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,one standard deviation,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,standard deviation estimated from duplicate analysis) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone,null,null,microgram per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (PC-04>LATITUDE 49.367>LONGITUDE 153.017) (PC-01>LATITUDE 46.317>LONGITUDE 152.533) (Station 5>LATITUDE 40>LONGITUDE 165.067) (Station 6>LATITUDE 37.75>LONGITUDE 162.717) (Station 8s>LATITUDE 44.783>LONGITUDE 170.167) The variation of sea surface temperature (SST) in the Kuroshio-Oyashio transition area and the Okhotsk Sea during the last 40 kyr was estimated using long-chain unsaturated alkyl ketones (alkenones). The temperature difference between the present and the last glacial period was about 5-6 C in the Kuroshio-Oyashio transition area, slightly larger than the 4 C previously reported. Moreover, alkenones were not detected before 18 kyr B.P. in or near the Okhotsk Sea, perhaps because of nearly year-round sea-ice expansion, which would have prevented the growth of alkenone producers, or because alkenones were less well preserved in surface sediments during the glacial period. The northward and southward migrations of frontal zones were evaluated using differences in alkenone temperatures between stations located in the vicinity of the Subarctic Front (SAF), Subarctic Boundary (SAB), and Kuroshio Bifurcation Front (KBF). All three frontal zones migrated southward during the glacial period, compared with their present positions, and their relative positions were different between the Holocene and glacial periods. In particular, the distance between the SAF and the SAB was reduced during the glacial period compared with at present. The northward and southward migration of the frontal zones may relate to both mid to low atmospheric circulation and polar atmospheric circulation. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Harada, N. Investigator : Ahagon, N. Investigator : Uchida, M. Investigator : Murayama, M. 2004-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/8458 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/harada2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station8-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station6-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/pc-01-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/pc-01-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/pc-04-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/pc-04-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station5-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/harada2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station8-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station6-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/pc-01-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/pc-01-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/pc-04-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/pc-04-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station5-tab.txt English https://www.ncdc.noaa.gov/paleo/study/8458 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/harada2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station8-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station6-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/pc-01-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/pc-01-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/pc-04-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/pc-04-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/station5-tab.txt Harada, N., N. Ahagon, M. Uchida, and M. Murayama. 2004. Northward and southward migrations of frontal zones during the past 40 kyr in the Kuroshio-Oyashio transition area. Geochem. Geophys. Geosyst., 5, Q09004. START YEAR: 39300 14C yr BP * END YEAR: 0 14C yr BP 152.533 37.75 170.167 49.367