کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5781140 1635372 2017 39 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Climate regulates the erosional carbon export from the terrestrial biosphere
ترجمه فارسی عنوان
محیط زیست، صادرات کربن فرسایشی از بیوسفر زمین را تنظیم می کند
کلمات کلیدی
دوچرخه کربن، فرسایش فیزیکی، رودخانه های کوه، رادیو کربن، آب و هوا و روان
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی
Climate is shown to regulate POCbiosphere discharge by mountain rivers, by controlling hydrologically-driven erosion processes. In catchments where discharge measurements are available (8 of the 33) a significant relationship exists between daily runoff (mm day− 1) and POCbiosphere concentration (mg L− 1) (r = 0.53, P < 0.0001). The relationship can be described by a single power law and suggests a high connectivity between forested hillslopes and mountain river channels. As a result, annual POCbiosphere yields are significantly correlated with mean annual runoff (r = 0.64, P < 0.0001). A shear-stress POCbiosphere erosion model is proposed which can explain the patterns in the data. The model allows the climate sensitivity of this carbon flux to be assessed for the first time. For a 1% increase in annual runoff, POCbiosphere discharge is predicted to increase by ~ 4%. In steeper catchments, POCbiosphere discharge increases more rapidly with an increase in annual runoff. For comparison, a 1% increase in annual runoff is predicted to increase carbon transfers by silicate weathering solute fluxes in mountains by 0.4-0.7%. Depending on the fate of the eroded POCbiosphere, river export of POCbiosphere from mountains may act as an important negative feedback on rising atmospheric CO2 and increased global temperature. Erosion of carbon from the terrestrial biosphere links mountain building and climate to the geological evolution of atmospheric CO2, while the carbon fluxes are sensitive to predicted changes in runoff over the coming century.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 277, 15 January 2017, Pages 118-132
نویسندگان
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