|Title||Spatial variations in the geochemistry of glacial meltwater streams in the Taylor Valley, Antarctica|
|Publication Type||Journal Article|
|Year of Publication||2010|
|Authors||Welch, KA, W Lyons, B, Whisner, C, Gardner, CB, Gooseff, MN, McKnight, DM, Priscu, JC|
|Pagination||662 - 672|
Streams in the McMurdo Dry Valleys, Antarctica, ﬂow during the summer melt season (4–12 weeks) when air temperatures are close to the freezing point of water. Because of the low precipitation rates, streams originate from glacial meltwater and ﬂow to closed-basin lakes on the valley ﬂoor. Water samples have been collected from the streams in the Dry Valleys since the start of the McMurdo Dry Valleys Long-Term Ecological Research project in 1993 and these have been analysed for ions and nutrient chemistry. Controls such as landscape position, morphology of the channels, and biotic and abiotic processes are thought to inﬂuence the stream chemistry. Sea-salt derived ions tend to be higher in streams that are closer to the ocean and those streams that drain the Taylor Glacier in western Taylor Valley. Chemical weathering is an important process inﬂuencing stream chemistry throughout the Dry Valleys. Nutrient availability is dependent on landscape age and varies with distance from the coast. The streams in Taylor Valley span a wide range in composition and total dissolved solids and are surprisingly similar to a wide range of much larger temperate and tropical river systems.