River water and sediment discharges

Mean multi-annual river water and suspended matter discharges for the main six Arctic rivers are shown in Table. Data are from the Roskomgidromet database for the period 1970-1995. Total discharge from the Eurasian territory into the

Table. River water, suspended particulate matter and organic carbon fluxes to the Arctic Ocean (Gordeev et al. 1996; Gordeev 2000; Gordeev and Rachold 2003)

Area

Water

Content

Flux

POC

River

discharge Total suspended matter

DOC

POC

TOC

DOC POC

TOC

in dry SPM

TOC

(103 km2)

(km3 year-1)

t/year-1)

(mg l-

1)

(106 t/year-1)

year 1)

Northern

Dvina

357

110

37

4.1

11.6

2.6

15.3

1.28 0.28

1.68

6.8

4.7

Pechora

324

131

72

9.4

12.3

0.3

13.0

1.66 0.04

1.70

0.43

5.2

Ob

2,545

404

37

15.5

9.1

0.9

7.1

3.68 0.36

2.87

2.3

1.1

Yenisei

2,595

620

8

4.7

8.5

0.3

7.4

4.86 0.17

4.59

3.6

1.8

Lena

2,448

523

39

20.7

6.6

1.1

7.7

3.6 1.2

4.8

5.8

1.9

Kolyma

647

122

83

10.1

6.1

3.1

8.1

0.74 0.38

0.99

3.0

1.5

Total for six rivers

8915

1910

34

64.5

8.3

1.0

8.3

15.82 2.43

19.06 3.8

2.1

Total

Eurasian

12,987

2,932

36

102.2

6.7

1.3

8.8

19.7 3.81

25.7

3.7

2.0

Arctic

Arctic Ocean is 2,932 km3-year-1 and mean specific discharge is 7.3 l-s-1 km-2 that is lower of the global mean of 11 l-s-1 km-2 (Milliman 1991). The seasonal variations in water discharge are shown in Fig. 5.

The concentration of suspended particulate matter (SPM) ranges in the Russian Arctic rivers from 6 to 207 mg/l with a mean of 36 mg/l (Table), that is much lower than the global average (460 mg/l, Gordeev 1983). SPM seasonal variations are very similar to water discharge.

-30000

-30000

Fig. 5. Seasonal variations in water discharge of the largest arctic rivers. The monthly discharge data are taken from the Regional, Electronic, Hydrographic Data Network for the arctic region (http://www.R-ArcticNET.sr.unh.edu) and represent the average discharges for the years 19801993 (Gordeev and Rachold 2003).

Fig. 5. Seasonal variations in water discharge of the largest arctic rivers. The monthly discharge data are taken from the Regional, Electronic, Hydrographic Data Network for the arctic region (http://www.R-ArcticNET.sr.unh.edu) and represent the average discharges for the years 19801993 (Gordeev and Rachold 2003).

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