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L. M. Mitnik M. L. Mitnik G. M. Chernyavsky I. V. Cherny A. V. Vykochko M. K. Pichugin E. V. Zabolotskikh 《Izvestiya Atmospheric and Oceanic Physics》2016,52(9):1041-1050
Application of satellite passive microwave sensing for the retrieval of key climatic parameters in the Barents Sea is considered. Fields of surface wind, atmosphere water vapor content and cloud liquid water content were found from MTVZA-GY radiometer onboard the Meteor-M N1 satellite and AMSR2 onboard the GCOM-W1 satellite with the use of original algorithms. The fields are in a good agreement with the ancillary remote and in situ measurements, which follows from the analysis of the evolution of the extra tropical and polar cyclones and cold air outbreaks with storm winds leading to intense air-sea interaction, and the formation and drift of sea ice. 相似文献
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Smirnova J. E. Zabolotskikh E. V. Bobylev L. P. Chapron B. 《Izvestiya Atmospheric and Oceanic Physics》2016,52(9):1128-1136
Izvestiya, Atmospheric and Oceanic Physics - In this study polar lows over the Nordic Seas for the period of 1995–2008 have been detected and studied using the Special Sensor Microwave Imager... 相似文献
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Izvestiya, Atmospheric and Oceanic Physics - Sea-ice monitoring using long-term data from satellite passive microwave instruments allows one to make quantitative estimates of climatic trends. These... 相似文献
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We analyze the space velocities of blue supergiants, long-period Cepheids, and young open star clusters (OSCs), as well as the H I and H II radial-velocity fields by the maximum-likelihood method. The distance scales of the objects are matched both by comparing the first derivatives of the angular velocity Ω′ determined separately from radial velocities and proper motions and by the statistical-parallax method. The former method yields a short distance scale (for R0=7.5 kpc, the assumed distances should be increased by 4%), whereas the latter method yields a long distance scale (for R0=8.5 kpc, the assumed distances should be increased by 16%). We cannot choose between these two methods. Similarly, the distance scale of blue supergiants should be shortened by 9% and lengthened by 3%, respectively. The H II distance scale is matched with the distance scale of Cepheids and OSCs by comparing the derivatives Ω′ determined for H II from radial velocities and for Cepheids and OSCs from space velocities. As a result, the distances to H II regions should be increased by 5% in the short distance scale. We constructed the Galactic rotation curve in the Galactocentric distance range 2–14 kpc from the radial velocities of all objects with allowance for the difference between the residual-velocity distributions. The axial ratio of the Cepheid+OSC velocity ellipsoid is well described by the Lindblad relation, while σu≈σv for gas. The following rotation-curve parameters were obtained: Ω0=(27.5±1.4) km s?1 kpc?1 and A=(17.1±0.5) km s?1 kpc?1 for the short distance scale (R0=7.5 kpc); and Ω0=(26.6±1.4) km s?1 kpc?1 and A=(15.4±0.5) km s?1 kpc?1 for the long distance scale (R0=8.5 kpc). We propose a new method for determining the angular velocity Ω0 from stellar radial velocities alone by using the Lindblad relation. Good agreement between the inferred Ω0 and our calculations based on space velocities suggests that the Lindblad relation holds throughout the entire sample volume. Our analysis of the heliocentric velocities for samples of young objects reveals noticeable streaming motions (with a velocity lag of ～7 km s?1 relative to the LSR), whereas a direct computation of the perturbation amplitudes in terms of the linear density-wave theory yields a small amplitude for the tangential perturbations. 相似文献
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The accuracy of the ERA-Interim reanalysis data
on total atmospheric water vapor is assessed using the AMSR2 (Advanced
Microwave Scanning Radiometer 2) measurements. The values of total
column water vapor over the open ocean obtained by applying the improved
algorithm to the ASMR2 data are used as reference ones to evaluate the
quality of water vapor content reproduced by the reanalysis. The
analysis performed for the Arctic region for 2015 and based on the
average daily values demonstrated a high accuracy of ERA-Interim data on
the Arctic water vapor equal to 1.1 kg/m2, which decreases
for the water vapor values above 15 kg/m2. Under such
conditions, the ERA-Interim data underestimate the water vapor content
by several kg/m2. The accuracy of ERA-Interim total water
vapor over the seas of the eastern sector of the Russian Arctic is 30%
lower than for the other Arctic regions. 相似文献
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The rain rate (RR) retrieval method for the RR estimation over ice-free areas of the ocean is presented. Measurements of the Japanese Advanced Microwave Scanning Radiometer 2 (AMSR2) on board the satellite GCOM-W1 are used. The method is based on the results of the numerical modeling of brightness temperatures of the outgoing microwave radiation of the ocean–atmosphere system and their subsequent conversion into the RR using neural networks. A simplified form of the transfer equation is used. Its errors for the considered wavelengths do not exceed 1 K at an RR of less than 20 mm/h. The method is verified by comparison with the Tropical Rainfall Measuring Mission’s (TRMM) Microwave Instrument (TMI) RR product. As a result of the comparison, the rain rate retrieval error within the range of 20 mm/h is found to be 1 mm/h. 相似文献
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E. V. Glushkova M. V. Zabolotskikh S. E. Koposov O. I. Spiridonova V. V. Vlasyuk A. S. Rastorguev 《Astronomy Letters》2010,36(1):14-26
We present the results of our BV R
c
I
c
CCD photometry for six Galactic open star clusters toward the Perseus spiral armperformed at the Special Astrophysical Observatory
of the Russian Academy of Sciences. Based on these data and using JHK
s
photometry from the 2MASS catalog, we have determined the ages, distances, and color excesses for the clusters: 710 Myr,
2960−340+400 pc, 0·
m
56 ± 0·
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04 (King 13); 130 Myr, 3010−280+300 pc, 0·
m
69 ± 0·
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04 (King 18); 560 Myr, 2630−270+310 pc, 0·
m
69 ± 0·
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08 (King 19); 160 Myr, 1750−70+80 pc, 0·
m
77 ± 0·
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05 (King 20); 250 Myr, 5220−320+350 pc, 0·
m
70 ± 0·
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09 (NGC 136); 320 Myr, 3390−200+210 pc, 0·
m
43 ± 0·
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03 (NGC 7245). 相似文献
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We propose a number of prospective observational programs for the ultraviolet space observatory WSO-UV, which seem to be of great importance to modern galactic astronomy. The programs include the search for binary Cepheids; the search and detailed photometric study and the analysis of radial distribution of UV-bright stars in globular clusters (“blue stragglers”, blue horizontal-branch stars, RR Lyrae variables, white dwarfs, and stars with UV excesses); the investigation of stellar content and kinematics of young open clusters and associations; the study of spectral energy distribution in hot stars, including calculation of the extinction curves in the UV, optical and NIR; and accurate definition of the relations between the UV-colors and effective temperature. The high angular resolution of the observatory allows accurate astrometric measurements of stellar proper motions and their kinematic analysis. 相似文献
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