دورية أكاديمية
Permafrost Boundary Shift in Western Siberia May Not Modify Dissolved Nutrient Concentrations in Rivers.
العنوان: | Permafrost Boundary Shift in Western Siberia May Not Modify Dissolved Nutrient Concentrations in Rivers. |
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المؤلفون: | Vorobyev, Sergey N., Pokrovsky, Oleg S., Serikova, Svetlana, Manasypov, Rinat M., Krickov, Ivan V., Shirokova, Liudmila S., Lim, Artem, Kolesnichenko, Larisa G., Kirpotin, Sergey N., Karlsson, Jan |
المصدر: | Water (20734441); Dec2017, Vol. 9 Issue 12, p985, 17p |
مصطلحات موضوعية: | RIVER pollution, PERMAFROST, PHOSPHORUS in water, AMMONIUM |
مصطلحات جغرافية: | SIBERIA, Western (Russia) |
مستخلص: | Identifying the landscape and climate factors that control nutrient export by rivers in high latitude regions is one of the main challenges for understanding the Arctic Ocean response to ongoing climate change. This is especially true for Western Siberian rivers, which are responsible for a significant part of freshwater and solutes delivery to the Arctic Ocean and are draining vast permafrost-affected areas most vulnerable to thaw. Forty-nine small- and medium-sized rivers (10-100,000 km²) were sampled along a 1700 km long N-S transect including both permafrost-affected and permafrost-free zones of the Western Siberian Lowland (WSL) in June and August 2015. The N, P, dissolved organic and inorganic carbon (DOC and DIC, respectively), particular organic carbon (POC), Si, Ca, K, Fe, and Mn were analyzed to assess the role of environmental parameters, such as temperature, runoff, latitude, permafrost, bogs, lake, and forest coverage on nutrient concentration. The size of the watershed had no influence on nutrient concentrations in the rivers. Bogs and lakes retained nutrients whereas forests supplied P, Si, K, Ca, DIC, and Mn to rivers. The river water temperature was negatively correlated with Si and positively correlated with Fe in permafrost-free rivers. In permafrost-bearing rivers, the decrease in T northward was coupled with significant increases in PO |
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قاعدة البيانات: | Complementary Index |
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