Annual estimates of water and solute export from 42 tributaries to the Yukon River

Hydrological Processes
By: , and 

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Abstract

Annual export of 11 major and trace solutes for the Yukon River is found to be accurately determined based on summing 42 tributary contributions. These findings provide the first published estimates of tributary specific distribution of solutes within the Yukon River basin. First, we show that annual discharge of the Yukon River can be computed by summing calculated annual discharges from 42 tributaries. Annual discharge for the tributaries is calculated from the basin area and average annual precipitation over that area using a previously published regional regression equation. Based on tributary inputs, we estimate an average annual discharge for the Yukon River of 210 km3 year–1. This value is within 1% of the average measured annual discharge at the U.S. Geological Survey gaging station near the river terminus at Pilot Station, AK, for water years 2001 through 2005. Next, annual loads for 11 solutes are determined by combining annual discharge with point measurements of solute concentrations in tributary river water. Based on the sum of solutes in tributary water, we find that the Yukon River discharges approximately 33 million metric tons of dissolved solids each year at Pilot Station. Discharged solutes are dominated by cations calcium and magnesium (5.65 × 109 and 1.42 × 109 g year–1) and anions bicarbonate and sulphate (17.3 × 109 and 5.40 × 109 g year–1). These loads compare well with loads calculated independently at the three continuous gaging stations along the Yukon River. These findings show how annual solute yields vary throughout a major subarctic river basin and that accurate estimates of total river export can be determined from calculated tributary contributions.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Annual estimates of water and solute export from 42 tributaries to the Yukon River
Series title Hydrological Processes
DOI 10.1002/hyp.8255
Volume 26
Issue 13
Year Published 2012
Language English
Publisher Wiley InterScience
Publisher location Chichester, Sussex, England
Contributing office(s) National Research Program - Central Branch
Description 13 p.
First page 1949
Last page 1961
Online Only (Y/N) N
Additional Online Files (Y/N) N