Most of the river discharge to the Arctic Ocean is delivered through a small number of large rivers. Following from the above discussion, only 12 hydrological gauges are sufficient to capture 91% of the total monitored area and 85% of the total monitored discharge (Shiklomanov et al., 2000, Lammers et al., 2001). The four largest drainage basins (the Ob, Yenisey, Lena and Mackenzie, Figure 2.8) contribute about 68% of the total gauged volume discharge to the Arctic Ocean on an annual basis. The Lena, Ob and Yenisei alone contribute on average 57% of the total discharge.
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