Analyzing Conditions for the Occurrence of the Voice of the Sea on the Basis of Infrasound Measurements     

Perepelkin  V. G.  Chunchuzov  I. P.  Kulichkov  S. N.  Popov  O. E.  Repina  I. A. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(1):73-85

Izvestiya, Atmospheric and Oceanic Physics - Conditions for the occurrence of the “voice of the sea” within the infrasonic range are studied and its parameters are determined from...  相似文献   

On the Applicability of Similarity Theory for the Stable Atmospheric Boundary Layer over Complex Terrain     

K. V. Barskov  A. V. Glazunov  I. A. Repina  V. M. Stepanenko  V. N. Lykossov  I. Mammarella 《Izvestiya Atmospheric and Oceanic Physics》2018,54(5):462-471

Micrometeorological measurements in the atmospheric boundary layer over a hilly forest terrain have been made on a meteorological tower at several levels from the forest canopy top to a height that exceeds the height of trees almost seven times. A semiempirical length scale depending on the local topography features and the underlying surface type has been proposed and calculated. This scale has been shown to allow the universal functions of the Monin–Obukhov similarity theory to be corrected for a stable atmospheric boundary layer over complex terrain without substantial modification when compared to the universal functions over a homogeneous surface with small roughness elements. This approach can be used to refine the methods for calculating turbulent momentum fluxes from profile measurements over spatially inhomogeneous landscapes.  相似文献   

Florencite-(Sm)—(Sm,Nd)Al₃(PO₄)₂(OH)₆: A new mineral species of the alunite-jarosite group from the subpolar urals     

S. A. Repina  V. I. Popova  E. I. Churin  E. V. Belogub  V. V. Khiller 《Geology of Ore Deposits》2011,53(7):564-574

Florencite-(Sm), a new mineral species of the florencite subgroup, was found in association with xenotime-(Y) in quartz veins of the Maldynyrd Range of the Subpolar Urals as thin zones within rhombohedral crystals of florencite-(Ce) with faceting by { 01[`1]1}\{ 01\bar 11\} and { 10[`1]2}\{ 10\bar 12\} . The thickness of particular florencite-(Sm) zones is 0.01–0.1 mm, and the total thickness of a series of such zones is 1–3 mm. Florencite-(Sm) is colorless and pale pink or pale yellow with white streaks; its Mohs hardness is 5.5–6.0. Its measured and calculated densities are 3.70 and 3.743 g/cm³, respectively. The mineral is transparent, nonpleochroic, and uniaxial (positive), and ω = 1.704(2) and ɛ = 1.713(2). The electron beam’s fluorescence spectrum was 592 nm (intense green luminescence of Sm³⁺) and 558 nm (yellow luminescence of Nd³⁺). The chemical composition was as follows (microprobe, average of 2 WDS, wt %): 0.62 La₂O₃, 3.29 Ce₂O₃, 1.05 Pr₂O₃, 10.31 Nd₂O₃, 12.62 Sm₂O₃, 0.41 Eu₂O₃, 2.30 Gd₂O₃, 0.13 Dy₂O₃, 0.71 SrO, 0.35 CaO, 29.89 Al₂O₃, 26.14 P₂O₅, 0.85 SO₃, 0.09 SiO₂, 88.76 in total; 10.74 H₂O (meas.). The empirical formula based on 14 oxygen atoms is (Sm_0.38Nd_0.32Gd_0.07Ce_0.10Pr_0.03La_0.02Eu_0.01Sr_0.04Ca_0.03)1.0Al_3.04(P_1.91S_0.05Si_0.01)_1.97O₁₄H_5.92. The idealized formula is (Sm,Nd)Al₃(PO₄)₂(OH)₆. Mineral is trigonal, space group R3m, a = 6.972(4), c = 16.182(7) ?, V = 681.2 ?³, Z = 3. The XRD pattern is as follows: dln (I) (hkl): 2.925 (10) (113), 1.881 (6) (303), 2.161 (5) (107), 5.65 (4) (101), and 3.479 (4) (110). The IR spectrum: 466, 510, 621, 1036, 1105, 1223, 2957, and 3374 cm⁻¹.  相似文献   

Eddy correlation measurements of air-sea CO<Subscript>2</Subscript> fluxes in the Laptev Sea in the summer period     

I. A. Repina  I. P. Semiletov  A. S. Smirnov 《Doklady Earth Sciences》2007,413(2):452-456

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Structure and Variability of Mesoscale Perturbations of Ocean Currents in the Drake Passage and Scotia Sea     

Koshlyakov  M. N.  Repina  I. A.  Savchenko  D. S.  Tarakanov  R. Y.  Taroyan  V. K. 《Oceanology》2019,59(2):171-181

Oceanology - Satellite altimeter observation data collected over 22 years are used to analyze the structure and variability of mesoscale fluctuations of ocean currents in the Drake Passage and...  相似文献   

Modeling an Urban Heat Island during Extreme Frost in Moscow in January 2017     

Yushkov  V. P.  Kurbatova  M. M.  Varentsov  M. I.  Lezina  E. A.  Kurbatov  G. A.  Miller  E. A.  Repina  I. A.  Artamonov  A. Yu.  Kallistratova  M. A. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(5):389-406

Izvestiya, Atmospheric and Oceanic Physics - Using the example of an analysis of an extreme lowering of temperature in Moscow in January 2017, the horizontal and vertical extent of the urban heat...  相似文献   

Numerical modeling of the influence of cool skin on the heat balance and thermal regime of a water body     

D. G. Chechin  I. A. Repina  V. M. Stepanenko 《Izvestiya Atmospheric and Oceanic Physics》2010,46(4):499-510

The influence that cool skin has on the energy exchange between the atmosphere and the ocean is investigated in this work. For this purpose, a series of numerical experiments with the use of the one-dimensional LAKE model of a water body were performed. Three types of cold-skin parameterization were used in this model. The data of in situ measurements in the coastal zone of the Black Sea, in the Arctic Ocean, and over Lake Sparkling served as the boundary and initial conditions. It has been established from the results of experiments that the LAKE model with the incorporated parameterization of the cool skin successfully reproduces cold-skin characteristics, namely, the difference between the temperature of the cool skin surface and the water temperature below the skin. The results of numerical experiments are within the variability of the results of in situ measurements. It has been shown that the presence of a cool skin reduces the heat losses of a body of water. The numerical experiments showed that the presence of a cool skin can change the thermal regime of a water body and its stratification by changing the heat balance at the surface. This result can be important for the modeling of many processes inside a body of water and at its surface, for example, gas and heat exchange.  相似文献   

The Effect of Seasonal Variability of Atlantic Water on the Arctic Sea Ice Cover     

V. V. Ivanov  I. A. Repina 《Izvestiya Atmospheric and Oceanic Physics》2018,54(1):65-72

Under the influence of global warming, the sea ice in the Arctic Ocean (AO) is expected to reduce with a transition toward a seasonal ice cover by the end of this century. A comparison of climate-model predictions with measurements shows that the actual rate of ice cover decay in the AO is higher than the predicted one. This paper argues that the rapid shrinking of the Arctic summer ice cover is due to its increased seasonality, while seasonal oscillations of the Atlantic origin water temperature create favorable conditions for the formation of negative anomalies in the ice-cover area in winter. The basis for this hypothesis is the fundamental possibility of the activation of positive feedback provided by a specific feature of the seasonal cycle of the inflowing Atlantic origin water and the peaking of temperature in the Nansen Basin in midwinter. The recently accelerated reduction in the summer ice cover in the AO leads to an increased accumulation of heat in the upper ocean layer during the summer season. The extra heat content of the upper ocean layer favors prerequisite conditions for winter thermohaline convection and the transfer of heat from the Atlantic water (AW) layer to the ice cover. This, in turn, contributes to further ice thinning and a decrease in ice concentration, accelerated melting in summer, and a greater accumulation of heat in the ocean by the end of the following summer. An important role is played by the seasonal variability of the temperature of AW, which forms on the border between the North European and Arctic basins. The phase of seasonal oscillation changes while the AW is moving through the Nansen Basin. As a result, the timing of temperature peak shifts from summer to winter, additionally contributing to enhanced ice melting in winter. The formulated theoretical concept is substantiated by a simplified mathematical model and comparison with observations.  相似文献   

The analysis of results of remote sensing monitoring of the temperature profile in lower atmosphere in Bergen (Norway)     

I. N. Ezau  T. Wolf  E. A. Miller  I. A. Repina  Yu. I. Troitskaya  S. S. Zilitinkevich 《Russian Meteorology and Hydrology》2013,38(10):715-722

Considered is the application of MTP-5 meteorological temperature profiler used for the remote sensing of vertical profiles of the air temperature in the planetary boundary layer and the lower one-kilometer layer of the atmosphere. The measurements were carried out in Bergen (Norway) in 2011–2012. The obtained dataset of temperature profiles has temporal resolution of five minutes and vertical resolution of 50 m. The MTP-5 data are complemented with the measurements of the air temperature and the wind taken at two automatic weather stations and with the measurements of the rain intensity made with the rain radar. Studied is the impact of meteorological conditions and precipitation on the MTP-5 readings. It is revealed that formation of a thin water film (of ice or, to a smaller degree, of sleet) on the surface of the sensor cover of MTP-5 has a significant impact on the data of the temperature monitoring. The removal of intensive precipitation (the precipitation rate is >0.2 mm/hour) improved the reliability and quality of the temperature profile monitoring. In particular, it is demonstrated that significant air pollution and stably stratified atmospheric conditions which lead to low temperatures are reliably monitored with this instrument.  相似文献   

Distribution and air-sea fluxes of carbon dioxide on the Chukchi Sea shelf     

I. I. Pipko  S. P. Pugach  I. A. Repina  O. V. Dudarev  A. N. Charkin  I. P. Semiletov 《Izvestiya Atmospheric and Oceanic Physics》2015,51(9):1088-1102

This article presents the results of long-term studies of the dynamics of carbonate parameters and air–sea carbon dioxide fluxes on the Chukchi Sea shelf during the summer. As a result of the interaction of physical and biological factors, the surface waters on the west of Chukchi Sea were undersaturated with carbon dioxide when compared with atmospheric air; the partial pressure of CO₂ varied in the range from 134 to 359 μatm. The average value of CO₂ flux in the Chukchi Sea per unit area varied in the range from–2.4 to–22.0 mmol /(m² day), which is significantly higher than the average value of CO₂ flux in the World Ocean. It has been estimated that the minimal mass of C absorbed by the surface of Chukchi Sea from the atmosphere during ice-free season is 13 × 10¹² g; a great part of this carbon is transported to the deeper layers of sea and isolated from the atmosphere for a long period of time. The studies of the carbonate system of the Chukchi Sea, especially of its western part, will provide some new data on the fluxes of carbon dioxide in the Arctic Ocean and their changes. Our analysis can be used for an interpretation of the satellite assessment of CO₂ fluxes and dissolved CO₂ distribution in the upper layers of the ocean.  相似文献