(Table 1) Vertical fluxes of sediment matter and organic carbon in the Kara Sea and in the Yenisey and Ob estuaries

Sedimentary particle fluxes in the Kara Sea and in the Ob and Yenisey estuaries were first estimated and particulate matter composition was studied in September 1993 during Cruise 49 of R/V Dmitry Mendeleev. Twenty three bottom stations with sediment traps were deployed, and samples were collected from 13 stations. Particle fluxes ranged from 9.0 to 62.6 mg/m**2/day to the north of the Ob and Yenisey estuaries and were 18.7 to 62.0 mg/m**2/day in the southwestern part of the Kara Sea. Fluxes were up to 1321 mg/m**2/day in the Ob estuary and up to 22156 mg/m**2/day in the Yenisey estuary. Organic matter fluxes were estimated as 0.71-3.29, 4.28-9.04, 26.7, and 368 mg/m**2/day, respectively. Particulate matter is largely represented by pellets of planktic Crustacea and by \"sea snow\" flakes mainly composed of diatoms. Rapidly settling particles are extensively inhabited by bacterial flora.1993年9月，在“德米特里·门捷列夫号”（R/V Dmitry Mendeleev）科考船第49次科考航次期间，科研人员首次对喀拉海（Kara Sea）以及鄂毕河（Ob）、叶尼塞河（Yenisey）河口的沉积颗粒通量进行了估算，并对颗粒物组成展开了研究。本次航次共布设23个搭载沉积物捕集器（sediment traps）的海底站位，并从其中13个站位采集了样品。鄂毕河与叶尼塞河河口以北区域的颗粒通量介于9.0~62.6 mg/m²/天之间，喀拉海西南部区域的颗粒通量为18.7~62.0 mg/m²/天；鄂毕河河口的颗粒通量最高可达1321 mg/m²/天，叶尼塞河河口的颗粒通量最高可达22156 mg/m²/天。经估算，上述四个区域的有机质通量分别为0.71~3.29 mg/m²/天、4.28~9.04 mg/m²/天、26.7 mg/m²/天以及368 mg/m²/天。颗粒物主要由浮游甲壳类（planktic Crustacea）粪球粒以及以硅藻（diatoms）为主要组分的“海雪”（sea snow）薄片构成，快速沉降颗粒表面广泛定殖着细菌菌群。