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نتیجه جستجو - Nitrous oxide emissions

تعداد مقالات یافته شده: 1
ردیف عنوان نوع
1 Power law scaling model predicts N2O emissions along the Upper Mississippi River basin
مدل مقیاس گذاری توان پیش بینی انتشار N2O در امتداد حوضه بالا می سی سی پی رودخانه-2020
Nitrous oxide (N2O) iswidely recognized as one of themost important greenhouse gases, and responsible for stratospheric ozone destruction. A significant fraction of N2O emissions to the atmosphere is from rivers. Reliable catchment-scale estimates of these emissions require both high-resolution field data and suitable models able to capture the main processes controlling nitrogen transformation within surface and subsurface riverine environments. Thus, this investigation tests and validates a recently proposed parsimonious and effective model to predict riverineN2Ofluxes withmeasurements taken along themain stemof the UpperMississippi River (UMR). Themodel parameterizesN2Oemissions bymeans of two denitrification Damköhler numbers; one accounting for processes occurring within the hyporheic and benthic zones, and the other one within the water column, as a function of river size. Its performance was assessed with several statistical quantitative indexes such as: Absolute Error (AE), Nash- Sutcliffe efficiency (NSE), percent bias (PBIAS), and ratio of the root mean square error to the standard deviation of measured data (RSR). Comparison of predicted N2O gradients between water and air (ΔN2O) with those quantified from fieldmeasurements validates the predictive performance of themodel and allow extending previous findings to large river networks including highly regulated rivers with cascade reservoirs and locks. Results show the major role played by the water column processes in contributing to N2O emissions in large rivers. Consequently, N2O productions along the UMR, characterized by regulated flows and large channel size, occur chiefly within this surficial riverine compartment, where the suspended particles may create anoxic microsites, which favor denitrification.
Keywords: Nitrous oxide emissions | River network | Upper Mississippi River
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