Dissolved and particulate organic carbon in the Sea of Okhotsk

Data on distribution of dissolved and particulate organic matter obtained during Cruises 21 and 24 of R/V Akademik A. Nesmeyanov in June-August 1992 and 1993 are presented. In general a remarkable heterogeneity in distributions of both dissolved and particulate organic carbon is revealed. Concentrations of dissolved organic carbon vary from 98 to 700 µmol/l and those of particulate organic carbon vary from 3 to 50 µmol/l. Maximum concentrations are commonly observed in the shelf region while minimum concentrations - in the central basin. Run-off of the Amur River raises dissolved matter concentration in the Sakhalin Bay, while oil exploitation at the Sakhalin shelf maximizes particulate organic carbon concentration and minimizes dissolved one. Concentrations of dissolved and particulate organic carbon in the surface microlayer were estimated for the first time and are shown to be 1.5-2.0 times higher than in surface waters.

Terrigenous proxy record from ODP Site 202-1237 and sediment core RRV9702a-69PC

ODP Site 1237 and sediment core RRV9702a-69PC were investigated for siliciclastic grain-size distributions and changes in geochemical composition to reconstruct southeast trade-wind variability during the past 5 Ma. Because both, working and archive halves of all ODP Site 1237 cores were completely depleted between 3.3 and 8.1 meters composite depths, (mcd), the corresponding sections of pre-site survey core RRV9702A-69PC were sampled and investigated to fill the gap.