Table T1 and Figure F2 show the variations of TOC contents of Hole 1175A, 1176A, and 1178A sediments.
In Hole 1175A, TOC varies between 0.48 and 0.88 wt% of dry sediment (average = 0.74 wt%). Low TOC contents occur at 5.37 mbsf (just above an ash layer) and 7.31 mbsf. In Hole 1176A, TOC varies between 0.53 and 0.92 wt% (average = 0.76 wt%). Low TOC contents occur at 0.82 mbsf (just above an ash layer), 6.25 mbsf (just below an ash layer), and 7.13 mbsf. In Hole 1178A, TOC varies between 0.33 and 0.70 wt%, (average = 0.56 wt%). A low TOC content occurs at 9.55 mbsf. The TOC contents in Hole 1178A are lower in average than those in Holes 1175A and 1176A.
In Hole 1175A, total alkenone (C37-C39 alkenones) concentration in dry sediment varies between 1.2 and 3.6 µg/g (average = 1.8 µg/g) (Table T1; Fig. F3). In Hole 1176A, total alkenone concentration varies between 0.4 and 2.0 µg/g (average = 1.1 µg/g). In Hole 1178A, the concentration varies between 0.5 and 4.8 µg/g (average = 1.9 µg/g). The concentration shows a downward-increasing trend with high-amplitude fluctuation in Holes 1175A and 1176A and the uppermost 6.00 m of Hole 1178A.
Paleotemperature estimated from Uk'37 varies from 20.0° to 24.6°C in Hole 1175A (Table T1; Fig. F4). In Hole 1176A, the estimated paleotemperature varies from 20.0° to 23.9°C. The temperature change in Hole 1176A possibly shows the last glacial to Holocene change of SST. The core-top (0.05-1.60 mbsf) temperature ranges between 23.2° and 23.9°C, which agrees with the present mean annual SST at this site (National Oceanic and Atmospheric Administration, 1998). The temperature difference between the core-top and glacial interval is ~3°C. In Hole 1178A, the estimated paleotemperature varies from 19.1° to 24.4°C. The temperature change in Hole 1178A possibly shows five glacial-interglacial cycles (marine isotope Stages 1 to 11). The temperature difference between glacial and interglacial intervals is ~4°C.