Table 3.
Estimated change in riverine DOC export to coastal areas for six main drainage basins in Europe and North America, for 1992–2016.
| Area | Runoffa | Median DOCb | ΔDOCc | DOC flux | DOC flux | DOC flux | DOC flux | |
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| 1992 | 2016 | 2016 | 1992–2016 | |||||
| Drainage area | 106 km2 | mm yr−1 | mg C l−1(N sites) | % yr−1 | g C m−2 yr−1 | g C m−2 yr−1 | Tg C yr−1 | % change |
| Norwegian Sea | 0.209 | 697 | 1.5 (16) | 0.9 | 1.1 | 1.3 | 0.3 | 22 |
| North Sea | 1.001 | 420 | 3.3 (138) | 1.8 | 1.4 | 2.0 | 2.0 | 43 |
| Baltic Sea | 1.660 | 277 | 6.7 (72) | 1.3 | 1.9 | 2.5 | 4.1 | 32 |
| Scotian Shelf | 0.197 | 397 | 6.0 (51) | 0.8 | 2.4 | 2.9 | 0.6 | 20 |
| North East Shelf | 0.538 | 485 | 3.7 (75) | 0.9 | 1.8 | 2.1 | 1.2 | 21 |
| Gulf of St Lawrence | 1.349 | 410 | 4.2 (51) | 0.6 | 1.7 | 1.9 | 2.6 | 14 |
| In Europe | 2.870 | — | — | — | 1.6 | 2.2 | 6.4 | 35 |
| In North America | 2.084 | — | — | — | 1.8 | 2.1 | 4.4 | 16 |
| Total | 4.954 | — | — | — | 1.7 | 2.2 | 10.7 | 27 |
a
Area and long-term statistics (annual runoff for 1990–2016) of GRDC timeseries data/online provided by the Global Runoff Data Centre of WMO. Koblenz: Federal Institute of Hydrology (BfG), (date of retrieval: 04 August 2021).
b
Median DOC in 1992 (based on 1990–1994 period) for each drainage basin. Number of sites (N) in each drainage basin in parentheses.
c
Median annual relative change in DOC per drainage basin for period 1990–2016.