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Ammonia fluxes in relation to cutting and fertilization of an intensively managed grassland derived from an inter-comparison of gradient measurements
Ammonia fluxes cutting fertilization grassland inter-comparison gradient measurements
2010/1/20
Quantification of ammonia (NH3) land-atmosphere exchange is required for atmospheric modelling and assessment of nitrogen deposition, yet flux measurement methods remain highly uncertain. To address t...
Intercomparison of ammonia measurement techniques at an intensively managed grassland site（Oensingen, Switzerland）
ammonia measurement techniques managed grassland site Switzerland
2009/5/6
As part of a field campaign in the framework of the NitroEurope project, three different instruments for atmospheric ammonia (NH3) measurements were operated side-by-side on a managed grassland site i...
Effect of porous photocatalyst reactor on decomposition of organic matter and nitrification of ammonia in sewage
porous photocatalyst sewage processing organic matter decomposition ammonium nitrification nitrifying bacteria
2009/4/2
A system for sewage water treatment in a primary sedimentation pond was investigated using a reactor tank equipped with cylindrical reactors which had porous photocatalyst coated with TiO2 around an u...
Characterization of Atmospheric Ammonia over Xi’an, China
NH3 NH4 + Aerosol Agricultural activity
2016/3/25
Continuous measurements of atmospheric ammonia (NH3) between April 2006 and April 2007
were conducted at an urban site and a suburban site in Xi’an, northwest China. NH3 was collected
using Ogawa pa...
Summertime PM2.5 ionic species in four major cities of China: nitrate formation in an ammonia-deficient atmosphere
PM2.5 ionic species China nitrate formation ammonia-deficient atmosphere
2009/3/13
Strong atmospheric photochemistry in summer can produce a significant amount of secondary aerosols, which may have a large impact on regional air quality and visibility. In the study reported herein,...
Dynamics of ammonia exchange with cut grassland:strategy and implementation of the GRAMINAE Integrated Experiment
Dynamics ammonia exchange cut grassland strategy implementation GRAMINAE Integrated Experiment
2010/1/19
A major international experiment on ammonia (NH3) biosphere-atmosphere exchange was conducted over intensively managed grassland at Braunschweig, Germany. The experimental strategy was developed to al...
Real-time measurements of ammonia, acidic trace gases and water-soluble inorganic aerosol species at a rural site in the Amazon Basin
acidic trace gases water-soluble inorganic aerosol species Amazon Basin
2009/2/27
We measured the mixing ratios of ammonia (NH3), nitric acid (HNO3), nitrous acid (HONO), hydrochloric acid (HCl), sulfur dioxide (SO2 and the corresponding water-soluble inorganic aerosol species, amm...
Real-time measurements of ammonia, acidic trace gases and water-soluble inorganic aerosol species at a rural site in the Amazon Basin
ammonia acidic trace gases water-soluble inorganic aerosol species Amazon Basin
2009/2/19
A detailed description of the WAD/SJAC and the analytical
procedures is given elsewhere (Slanina et al., 2001; Wyers
et al., 1993). A simplified sketch of the sampling system
is shown in Fig. 2. Th...
Temporal variability in bioassays of the stomatal ammonia compensation point in relation to plant and soil nitrogen parameters in intensively managed grassland
Temporal variability stomatal ammonia compensation point plant and soil nitrogen parameters
2010/1/19
The exchange of ammonia between crop canopies and the atmosphere depends on a range of plant parameters and climatic conditions. However, little is known about effects of management factors. We have h...
Modelling the dynamic chemical interactions of atmospheric ammonia with leaf surface wetness in a managed grassland canopy
dynamic chemical interactions atmospheric ammonia leaf surface wetness grassland canopy
2010/1/19
Ammonia exchange fluxes between grassland and the atmosphere were modelled on the basis of stomatal compensation points and leaf surface chemistry, and compared with measured fluxes during the GRAMINA...
Contribution of different grass species to plant-atmosphere ammonia exchange in intensively managed grassland
Contribution grass species plant-atmosphere ammonia exchange grassland
2010/1/19
Species diversity in grasslands usually declines with increasing input of nitrogen from fertilizers or atmospheric deposition. Conversely, species diversity may also impact the build-up of soil and pl...
Vertical structure and diurnal variability of ammonia exchange potential within an intensively managed grass canopy
Vertical structure diurnal variability ammonia exchange grass canopy
2010/1/19
Stomatal ammonia compensation points (χs) of grass species on a mixed fertilized grassland were determined by measurements of apoplastic [NH4+] and [H>+] in the field. Calculated χs values were compar...
Ice nucleation of ammonia gas exposed montmorillonite mineral dust particles
Ice nucleation ammonia gas montmorillonite mineral dust particles
2008/12/15
The ice nucleation characteristics of montmorillonite mineral dust aerosols with and without exposure to ammonia gas were measured at different atmospheric temperatures and relative humidities with a ...
Amines are likely to enhance neutral and ion-induced sulfuric acid-water nucleation in the atmosphere more effectively than ammonia
Amines sulfuric acid-water nucleation ammonia
2008/11/13
We have studied the structure and formation thermodynamics of dimer clusters containing H2SO4 or HSO4− together with ammonia and seven different amines possibly present in the atmosphere, using ...
The role of ammonia in sulfuric acid ion induced nucleation
ammonia sulfuric acid ion nucleation
2008/11/10
We have developed a new multi-step strategy for quantum chemical calculations on atmospherically relevant cluster structures that makes calculation for large clusters affordable with a good accuracy-t...