搜索结果: 1-10 共查到“大气科学 surfaces”相关记录10条 . 查询时间(0.031 秒)
Scanning electron microscopy and molecular dynamics of surfaces of growing and ablating hexagonal ice crystals
electron microscopy molecular dynamics growing and ablating hexagonal ice crystals
2010/8/12
We present the first clearly resolved observations of surfaces of growing and ablating hexagonal ice crystals using variable-pressure scanning electron microscopy. The ice surface develops trans-prism...
Kinetics and mechanisms of heterogeneous reaction of NO2 on CaCO3 surfaces under dry and wet conditions
heterogeneous reaction CaCO3 surfaces dry wet
2010/2/1
With increasing NO2 concentration in the troposphere, the importance of NO2 reaction with mineral dust in the atmosphere needs to be evaluated. Until now, little is known about the reaction of NO2 wit...
Oxidation of SO2 by H2O2 on ice surfaces at 228 K: a sink for SO2 in ice clouds
SO H2O2 ice surfaces SO2 ice clouds
2009/3/12
The heterogeneous reaction SO2 + H2O2 H2SO4 on ice at 228 K has been studied in a low temperature coated-wall flow tube. With H2O2 in excess of SO2, the loss of SO2 on an ice surface is time depende...
Uptake and reaction of HOBr on frozen and dry NaCl/NaBr surfaces between 253 and 233 K
HOBr frozen and dry NaCl/NaBr surfaces
2009/3/11
Variation of the pH of the NaCl / NaBr solution used to prepare the frozen surfaces was found to have no significant influence on the results. The observations are explained in terms of initial format...
Heterogeneous conversion of NO2 on secondary organic aerosol surfaces: A possible source of nitrous acid（HONO）in the atmosphere?
Heterogeneous conversion NO2 secondary organic aerosol nitrous acid HONO
2009/3/10
The heterogeneous conversion of NO2 on different secondary organic aerosols (SOA) was investigated with the focus on a possible formation of nitrous acid (HONO). In one set of experiments different or...
Fluxes of nitrates between snow surfaces and the atmosphere in the European high Arctic
Fluxes of nitrates snow surfaces atmosphere European high Arctic
2009/3/10
Measurements of atmospheric and snow mixing ratios of nitrates and nitrites and their fluxes above the snow surface were made during two intensive campaigns during spring time 2001 at Ny-Ålesund...
A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements
water uptake DRIFT spectroscopy thermogravimetric analysis aerosol growth measurements
2009/2/19
The hygroscopicity of mineral aerosol samples has been examined by three independent methods: diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and differential m...
Distinction between clouds and ice/snow covered surfaces in the identification of cloud-free observations using SCIAMACHY PMDs
clouds ice/snow covered surfaces cloud-free SCIAMACHY PMDs
2009/2/18
SCIAMACHY on ENVISAT allows measurement of different trace gases including those most abundant in the troposphere (e.g. CO2, NO2, CH4, BrO, SO2). However, clouds in the observed scenes can severely hi...
Heterogeneous conversion of NO2 and NO on HNO3 treated soot surfaces: atmospheric implications
NO2 NO HNO3 soot surfaces atmospheric implications
2009/1/23
For the treatment of soot by pure HNO3 only reversible uptake with a surface coverage of ~1-2x1014 HNO3 cm-2 was observed for HNO3 mixing ratios in the range 250-800ppbv. Only for higher HNO3 mixing r...
Surprisingly small HONO emissions from snow surfaces at Browning Pass, Antarctica
HONO emissions snow surfaces Browning Pass Antarctica
2009/1/12
Measured Fluxes of nitrous acid at Browning Pass, Antarctica were very low, despite conditions that are generally understood as favorable for HONO emissions, including: acidic snow surfaces, an abunda...