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The characteristics and formation conditions of eddy meridional heat transport (MHT) in the eastern equatorial Pacific are studied using the results of eddy-resolving numerical modeling as compared with observational and reanalysis data. Calculations of the eddy MHT convergence at the equator are performed and realistic results in the analyzed region except for its easternmost part are obtained. The interannual variability and velocity of propagation of tropical instability waves are estimated. The errors of the time-averaged model solution are analyzed, and the assumptions on the mechanisms of their occurrence are made. 相似文献
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Reconstruction of hydrological fields and reproduction of climatic circulation of World Ocean waters
A. S. Sarkisyan K. V. Ushakov V. S. Arkhipkin A. R. Gorbushkin 《Izvestiya Atmospheric and Oceanic Physics》2016,52(5):524-534
Due to a lack of observational data, the hydrological fields of temperature, salinity, and density used by oceanographers at present remain significantly smoothed. Specifically, this refers to the WOA data distributed freely by the group of Sidney Levitus. This study describes the history of synthesis of hydrological data and mathematical modeling with high resolution. Our aim is to minimize the drawbacks of original data of hydrological fields, improve them with the help of a mathematical model, and thus reproduce the current fields. The results of some realistic calculations are presented. 相似文献
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O. A. Girina A. G. Manevich N. A. Malik D. V. Mel’nikov S. V. Ushakov Yu. V. Demyanchuk L. V. Kotenko 《Journal of Volcanology and Seismology》2007,1(4):237-247
In 2005, six major eruptions of four Kamchatka volcanoes (Bezymyannyi, Klyuchevskoy, Shiveluch, and Karymskii) occurred and the Avachinskii, Mutnovskii, and Gorelyi Kamchatka volcanoes and the Ebeko and Chikurachki volcanoes in northern Kurils were in a state of increased activity. Owing to a close collaboration between the KVERT project, Elizovo airport meteorological center, and volcanic ash advisory centers in Tokyo, Anchorage, and Washington (Tokyo, Anchorage, and Washington VAACs), all necessary measures for safe airplane flights near Kamchatka were taken and fatal accidents related to volcanic activity did not occur. 相似文献
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S. M. Fazlullin S. V. Ushakov R. A. Shuvalov M. Aoki A. G. Nikolaeva E. G. Lupikina 《Journal of Volcanology and Geothermal Research》2000,97(1-4)
A subaqueous eruption in Karymsky lake in the Academii Nauk caldera dramatically changed its water column structure, water chemistry and biological system in less than 24 h, sending major floodwaves down the discharging river and eruption plumes with ash and gases high into the atmosphere. Prior to the eruption, the lake had a pH of about 7, was dominated by bicarbonate, and well stocked with fish, but turned in early 1996 into a stratified, initially steaming waterbody, dominated by sulfate with high Na and K levels, and devoid of fish. Blockage of the outlet led to rising waterlevels, followed by dam breakage and catastrophic water discharge. The total energy input during the eruption is estimated at about 1016 J. The stable isotope composition of the lake water remained dominated by the meteoric meltwaters after the eruption. 相似文献
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The use of multi‐frequency acquisition to significantly improve the quality of fibre‐optic‐distributed vibration sensing 
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下载免费PDF全文 A.H. Hartog L.B. Liokumovich N.A. Ushakov O.I. Kotov T. Dean T. Cuny A. Constantinou F.V. Englich 《Geophysical Prospecting》2018,66(Z1):192-202
Unlike conventional sensors that measure the passage of seismic waves at a single position, distributed vibration sensing systems, also known as distributed acoustic sensing systems, detect the passage of seismic waves by averaging a measurement of strain over a section of fibre‐optic cable. Distributed vibration sensing systems work by transmitting pulses of light down the fibre and measuring the phase of the Rayleigh backscatter. At random positions along the fibre, however, fading occurs; this is where the amplitude of the backscattered signal is very small due to cancellation of the scattered electric fields, resulting in anomalously noisy traces in a common source gather. This paper addresses the problem of fading in a particular form of distributed vibration sensors: a new optical arrangement of the instrumentation is described that allows the measurement to be carried out quasi‐simultaneously at multiple optical interrogation frequencies. The interrogation frequencies are chosen to be sufficiently different that their fading properties are distinct and the diversity thus obtained is used to aggregate the data obtained to substantially reduce the noise caused by fading. As well as reducing the effects of fading, the aggregation of the independent results can also help to reduce the overall noise of the measurement and improve the linearity of the distributed vibration sensing system. 相似文献
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A computational model is developed for the origin of protogalactic eddies at the fronts of large-scale pancake shocks. Possible effects of orientation of spiral galaxies in their pairs, groups, clusters and superclusters are discussed. 相似文献
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沉积盆地学说的发展及主要的含油气盆地分类 总被引：3，自引：0，他引：3
从科学史观出发，介绍了含油气盆地概念及其学说的发展。展示主要的盆地分类方案，论述含油气盆地分类研究在盆的含油气性评价中所具有的重要意义。指出盆地分类研究的发展方向和未来分类方案所应具有的特点。 相似文献