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A high‐resolution time series of oxygen isotopes from the Kolyma River: Implications for the seasonal dynamics of discharge and basin‐scale water use
Author(s) -
Welp L. R.,
Randerson J. T.,
Finlay J. C.,
Davydov S. P.,
Zimova G. M.,
Davydova A. I.,
Zimov S. A.
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl022857
Subject(s) - snowmelt , permafrost , environmental science , water cycle , snow , hydrology (agriculture) , surface runoff , drainage basin , evapotranspiration , arctic , precipitation , watershed , streamflow , structural basin , geology , oceanography , geomorphology , ecology , meteorology , geotechnical engineering , cartography , geography , physics , machine learning , computer science , biology
Intensification of the Arctic hydrologic cycle and permafrost melt is expected as concentrations of atmospheric greenhouse gases increase. Quantifying hydrologic cycle change is difficult in remote northern regions; however, monitoring the stable isotopic composition of water runoff from Arctic rivers provides a means to investigate integrated basin‐scale changes. We measured river water and precipitation δ 18 O and δD to partition the river flow into snow and rain components in the Kolyma River basin. On an annual basis, we found water leaving the basin through the river consisted of 60% snow and 40% rain. This is compared with annual precipitation inputs to the watershed of 47% snow and 53% rain. Despite the presence of continuous permafrost, and fully frozen soils in the spring, our analysis showed not all spring snowmelt runs off into the river immediately. Instead, a substantial portion is retained and leaves the basin as growing season evapotranspiration.