Estimation of nocturnal CO2 and N2O soil emissions from changes in surface boundary layer mass storage

Autor:	Rex A. Omonode, Richard H. Grant
Rok vydání:	2018
Předmět:	Canopy Atmospheric Science 010504 meteorology & atmospheric sciences Turbulence Flow (psychology) Nitrous oxide 010501 environmental sciences Nocturnal Atmospheric sciences 01 natural sciences Control volume Trace gas chemistry.chemical_compound chemistry Carbon dioxide 0105 earth and related environmental sciences
Zdroj:	Atmospheric Measurement Techniques. 11:2119-2133
ISSN:	1867-8548
DOI:	10.5194/amt-11-2119-2018
Popis:	Annual budgets of greenhouse and other trace gases require knowledge of the emissions throughout the year. Unfortunately, emissions into the surface boundary layer during stable, calm nocturnal periods are not measurable using most micrometeorological methods due to non-stationarity and uncoupled flow. However, during nocturnal periods with very light winds, carbon dioxide (CO2) and nitrous oxide (N2O) frequently accumulate near the surface and this mass accumulation can be used to determine emissions. Gas concentrations were measured at four heights (one within and three above canopy) and turbulence was measured at three heights above a mature 2.5 m maize canopy from 23 July to 10 September 2015. Nocturnal CO2 and N2O fluxes from the canopy were determined using the accumulation of mass within a 6.3 m control volume and out the top of the control volume within the nocturnal surface boundary layer. Diffusive fluxes were estimated by flux gradient method. The total accumulative and diffusive fluxes during near-calm nights (friction velocities
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::44c67aa6840f8faef1f3687e2f5d9d2b https://doi.org/10.5194/amt-11-2119-2018 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.