A new injection technique of microquantity of water from fluid inclusions into mass spectrometer for measurement of hydrogen and oxygen isotope compositions     

A. I. Buikin  O. V. Kuznetsova  V. S. Sevast’yanov  Yu. A. Nevinny 《Geochemistry International》2016,54(2):205-207

  相似文献   

Characterization of the proteinaceous matter in marine aerosols   总被引：1，自引：0，他引：1  

Marina Kuznetsova  Cindy Lee  Josephine Aller 《Marine Chemistry》2005,96(3-4):359-377

Marine aerosols play a dominant role in the transfer of oceanic material to the atmosphere. Most marine aerosol originates when air bubbles burst at the sea surface ejecting material from the sea surface microlayer and bubble surface layers into the air. Concentrations of chemical compounds in these surface layers often differ from their concentrations in bulk water. We examined the enrichment of aerosols with proteinaceous matter and attempted to characterize the physical nature and sources of this matter. We measured concentrations of dissolved free (DFAA), dissolved combined (DCAA), and particulate (PAA) amino acids, transparent stainable particles (TSP), and bacteria and virus-like particles as carriers of protein, in natural and simulated aerosols. We also evaluated D/L ratios certain amino acids in all amino acid fractions.DFAA and DCAA enriched the aerosols we sampled by 1.2–20 times compared to bulk seawater; PAA enrichment was usually higher (up to 50-fold). Aerosols contained particles typical of seawater, e.g., microorganisms, organic debris, inorganic particles with adsorbed organic matter, but also a large number of semitransparent gel-like particles, which all contained amino acids. Some of these particles were probably scavenged from bulk water, but new particles produced as bubbles burst at the surface comprised at least 10% of total proteinaceous matter in the aerosol. D/L ratios of certain amino acid suggested that the particles were most likely made from dissolved polymers secreted by phytoplankton that were concentrated on bubble surfaces and in the microlayer. Examination with Alcian Blue (a dye that targets carbohydrates) and Coomassie Blue (a dye that targets proteins) showed that most TSP in the aerosols contained both proteins and polysaccharides. Microorganisms enriched the aerosols by up to two orders of magnitude, but contributed less than 4% to the total protein pool.  相似文献   

Detecting gas seeps in Arctic water areas using remote sensing data     

V. G. Bondur  T. V. Kuznetsova 《Izvestiya Atmospheric and Oceanic Physics》2015,51(9):1060-1072

  相似文献   

Ozone content over the Russian federation in 2007     

A. M. Zvyagintsev  N. S. Ivanova  G. M. Kruchenitskii  I. N. Kuznetsova  E. A. Lezina 《Russian Meteorology and Hydrology》2008,33(2):130-134

The review is compiled based on the results of the operational of the Total Ozone (TO) Monitoring System in the CIS and Baltic countries, functioning in the operational regime at the Central Aerological Observatory (CAO). Basic TO observational data for each month of the fourth quarter of 2007 and for the year as a whole are summarized. Long-term TO changes at Russian stations are compared with similar changes at two foreign stations in the temperate latitudes of the Northern Hemisphere. Data on the spring Antarctic ozone anomaly of 2007 are considered. Results of regular observations of surface ozone concentration in the Moscow region are also presented.  相似文献   

Ozone content over the Russian Federation in 2008     

A. M. Zvyagintsev  N. S. Ivanova  G. M. Kruchenitskii  I. N. Kuznetsova  E. A. Lezina  Ya. O. Romanyuk 《Russian Meteorology and Hydrology》2009,34(3):187-193

Areview is compiled based on the results of the system of monitoring total ozone (TO) over the CIS and Baltic countries that is operated in real time at the Central Aerological Observatory (CAO). The TO monitoring system uses the data from the national M-124 filter ozonometer network operated under the methodological guidance of the Main Geophysical Observatory. The performance of the system as a whole is operationally verified against the OMI satellite (US NASA) observations. The main TO observational data are summarized for each month of the fourth quarter of 2008, for a quarter, and a year as a whole. Data on the Spring Antarctic Ozone Anomaly in 2008 are presented. Results of regular surface ozone observations in the Moscow region and in Kiev are also considered.  相似文献   

Surface ozone concentration variability in Moscow and Kiev     

A. M. Zvyagintsev  I. B. Belikov  N. F. Elanskii  I. N. Kuznetsova  Ya. O. Romanyuk  M. G. Sosonkin  O. A. Tarasova 《Russian Meteorology and Hydrology》2010,35(12):806-812

The comparison is represented of the results of surface ozone concentration measurements in two megalopolises, Moscow and Kiev. A temporal course of ozone concentration and temperature in both cities is close by the shape and is typical of medium-polluted plain stations. In both megalopolises, two maxima are observed within the seasonal ozone concentration variability, in spring and summer, and during the day, a usual ozone concentration maximum (approximately in 2–3 hours after the local noon) and the night one being typical of big cities. An average ozone concentration and an average temperature in corresponding periods are higher in Kiev than in Moscow. Evidently, the summer maximum is associated with photochemical ozone generation processes, and the spring one, with dynamic processes of its transport in the atmosphere. In both megalopolises, the episodes are observed in the warm period under meteorological conditions being unfavorable for the pollutant scattering in the atmosphere when the ozone concentration exceeds the threshold limit value and is dangerous for health. The repeatability of such episodes is the highest one in July-August. In Kiev, such episodes are more frequent than in Moscow. An effective statistical model is constructed for both megalopolises in which the observed ozone concentration is represented in the form of regression function of temperature and relative humidity.  相似文献   

Investigation of temporal-spatial parameters of an urban heat island on the basis of passive microwave remote sensing     

M. N. Khaikine  I. N. Kuznetsova  E. N. Kadygrov  E. A. Miller 《Theoretical and Applied Climatology》2006,84(1-3):161-169

Summary Quantitative measurements of the impact of an urban environment on the thermal state of the atmospheric boundary layer are presented. Temperature profiles up to the height of 600 m were obtained in a continuous series of measurements by three microwave profilers MTP-5 located in different areas of Moscow. The influence of this large city on urban heat island (UHI) parameters was estimated on occasions with stationary atmospheric processes and during cases with frontal passage. Two types of UHI were identified: one with a dome of urban warmth at all levels, and another with a low warm dome in combination with a lens of cold air above.  相似文献   

On the MHD effects on the force-free monopole outflow     

V. S. Beskin  I. V. Kuznetsova  & R. R. Rafikov 《Monthly notices of the Royal Astronomical Society》1998,299(2):341-348

The stationary axisymmetric outflow from a rotating sphere with a (split) monopole magnetic field is considered. The stream equation describing the outflow is linearized in terms of the Michel magnetization parameter σ⁻¹ ≪ 1, which allows a self-consistent analysis of the direct problem. It is shown that for a finite σ the fast magnetosonic surface is located at a finite distance ∼ σ^1/3 R _L ( R _L =  c /Ω_F is the light cylinder). We have also found that the particle energy at the fast surface is just equal to the Michel value γ ∼ 1/3σ. The particle acceleration and magnetic field collimation are shown to become ineffective outside the fast magnetosonic surface.  相似文献   

Impact of Air Transport on Seasonal Variations and Trends of Surface Ozone at Kislovodsk High Mountain Station     

Oksana A. Tarasova  Nicolai F. Elansky  Gennady I. Kuznetsov  Irina N. Kuznetsova  Irina A. Senik 《Journal of Atmospheric Chemistry》2003,45(3):245-259

The impact of air transport on the surface ozone variations is analyzed at Kislovodsk High Mountain Station for the period 1989–1996 on the basis of 2D back trajectories. It was shown that the contribution of photochemical and dynamical processes is different for the different seasons. In summer months the surface ozone concentration is governed by photochemical ozone production in semi polluted air from the regions of Northern Caspian, Southern Ural and Volga region. Time of the seasonal ozone maximum appearance is defined by joint influence of the processes of photochemical production and destruction in the eastern sectors and advection from Ukraine and Central Europe. The value of the seasonal minimum is determined by the processes of ozone destruction in the air coming from northeastern direction in the stable frontal zone. Distribution of sectors of the air transport changes from year to year and it can partly explain strong negative trend of the surface ozone concentration at the site.  相似文献   

Dissolved free and combined amino acids in nearshore seawater,sea surface microlayers and foams: Influence of extracellular hydrolysis   总被引：1，自引：0，他引：1  

Marina Kuznetsova  Cindy Lee 《Aquatic Sciences - Research Across Boundaries》2002,64(3):252-268

  相似文献