FAUNAL ANALYSIS OF MID-PIACENZIAN INTERVAL OF ODP SITE 1208 FOR PLIOCENE MODEL INTERCOMPARISON PROJECT, PHASE 2
Here we report an initial quantitative faunal analysis for a closely-spaced sequence of samples within core 16 of Site 1208, extending from MIS M2 – KM5.3. Site 1208 is located in the Northwest Pacific Ocean, 3346m beneath the modern day Kuroshio Current Extension, approximately 1400km east of Tokyo. The planktonic foraminiferal assemblage is dominated by Globorotalia inflata. Secondary species include Neogloboquadrina dutertrei and Neogloboquadrina pachyderma (dextral). Minor taxa include Globigerina bulloides, Globigerina calida, Globigerina praedigitata, Globigerinita glutinata, Globigerinoides ruber, Globorotalia crassaformis, Globorotalia tumida, and Orbulina universa.
The modern analog technique was used to compare our Pliocene faunal data to a global modern coretop database to determine paleoceanographic estimates based on the closest modern analogs. The Mean Annual Temperature (MAT) at Site 1208 today is 19.55°C, with a seasonal variation of 10°C. Pliocene KM5.3 data estimate a slightly warmer MAT, at 19.78°C, but show a decrease in seasonal variation to 5°C. Phase 1 PlioMIP results from the GISS ModelE2-R Pliocene simulation show an identical MAT at this location and corroborate a minor northward displacement of the paleo-Kuroshio Current relative to its modern position.