Radiocarbon dating of Danube Delta deposits     

Nicolae Panin  Stefana Panin  Norman Herz  John E. Noakes 《Quaternary Research》1983,19(2):249-255

The Holocene history of the Danube Delta has been studied using ¹⁴C analyses of faunal material. The principal phases of development include: (1) initial Letea Caroarman spit, 11,700–9800 yr B.P. in its central part, 8800-5500 yr B.P. in its southern part; (2) Sf. Gheorghe I Delta, 8900-7200 yr B.P.; (3) Sulina Delta, 7200-2000 yr B.P., and (4) Sf. Gheorghe II Delta-Chilia Delta 2000 yr B.P.-present. Other smaller-scale features have also been dated, including secondary deltas (Co?na and Sinoe Deltas) and littoral bars. Age determinations carried out on whole samples were erratic and it was found that individual species had to be separated and dated. In all cases, the older dates were of transported material whereas the younger dates gave the true age of the formation.  相似文献   

Evolution of the Landscape of the Western Part of the Turan–Uyuk Basin (Tuva Highland) in the Late Pleistocene     

Belyaev  Yu. R.  Panin  A. V.  Kiryuhina  A. D.  Koshurnikov  A. V.  Kramynin  A. M.  Pavlov  M. A.  Konstantinov  E. A.  Kurbanov  R. N.  Zakharov  A. L.  Sychev  N. V. 《Doklady Earth Sciences》2022,506(1):S84-S93

Doklady Earth Sciences - A complex of works including geomorphological deciphering, field survey, drilling, electric prospecting, and dating of deposits using the radiocarbon method and optically...  相似文献   

The Contribution of Glacial Melt Water to Annual Runoff of River Volga in the Last Glacial Epoch     

Panin  A. V.  Sidorchuk  A. Yu.  Ukraintsev  V. Yu. 《Water Resources》2021,48(6):877-885

Water Resources - The runoff of glacial melt water into the river system of the Volga and farther into the Caspian Sea is evaluated for the epoch of the last glaciation. Melt water entered the...  相似文献   

On methods for loop heat pipe control by external heat action     

K. A. Goncharov  O. A. Golovin  A. Yu. Kochetkov  M. A. Balykin  K. N. Korzhov  Yu. V. Panin  V. A. Antonov 《Solar System Research》2013,47(7):554-560

In this paper, methods of control for the temperature of the loop heat pipe evaporator by an external thermal action on elements of the pipe construction are described.  相似文献   

Channel morphology and river flow in the northern Russian Plain in the Late Glacial and Holocene     

A. Y. Sidorchuk  A. V. Panin  O. K. Borisova  S. A. Elias  J. P. Syvistki 《International Journal of Earth Sciences》2000,89(3):541-549

The relicts of large meandering palaeochannels are found throughout the territory of the periglacial zone of the Last (Valdai=Weichselian) Glaciation on the Russian Plain. Channel widths of macromeanders can be 15 times larger than the recent meanders of the same rivers. Palaeolandscape and palaeohydrological reconstructions show that these periglacial river channels were formed under conditions of high spring water flow, up to eight times greater than the modern discharges, when the flow coefficient was close to 0.9-1.0 due to presence of permafrost, summers were dry and streams lacked ground water supply. Permafrost degradation increased soil permeability in spring and increased ground water flow in summer, causing a decrease of annual flow (due mainly to the flood flow decrease in spring). As a result, large periglacial channels were abandoned and transformed into lakes and bogs. Late Holocene channels have much smaller channel widths and meander lengths. These were formed under conditions of lower annual flows and much steadier flow regime.  相似文献   

Estimating Annual Volga Runoff in the Late Glacial Epoch from the Size of River Paleochannels     

Sidorchuk  A. Yu.  Ukraintsev  V. Yu.  Panin  A. V. 《Water Resources》2021,48(6):864-876

Water Resources - Large paleochannels, which are common in the floodplains and terraces of rivers in the Volga Basin, are indicators of an appreciable increase in river flow in the past and can be...  相似文献   

Seismic expression of gas and gas hydrates across the western Black Sea     

Irina Popescu  Gilles Lericolais  Nicolae Panin  Marc De Batist  Hervé Gillet 《Geo-Marine Letters》2007,27(2-4):173-183

This study is a synthesis of gas-related features in recent sediments across the western Black Sea basin. The investigation is based on an extensive seismic dataset, and integrates published information from previous local studies. Our data reveal widespread occurrences of seismic facies indicating free gas in sediments and gas escape in the water column. The presence of gas hydrates is inferred from bottom-simulating reflections (BSRs). The distribution of the gas facies shows (1) major gas accumulations close to the seafloor in the coastal area and along the shelfbreak, (2) ubiquitous gas migration from the deeper subsurface on the shelf and (3) gas hydrate occurrences on the lower slope (below 750 m water depth). The coastal and shelfbreak shallow gas areas correspond to the highstand and lowstand depocentres, respectively. Gas in these areas most likely results from in situ degradation of biogenic methane, probably with a contribution of deep gas in the shelfbreak accumulation. On the western shelf, vertical gas migration appears to originate from a source of Eocene age or older and, in some cases, it is clearly related to known deep oil and gas fields. Gas release at the seafloor is abundant at water depths shallower than 725 m, which corresponds to the minimum theoretical depth for methane hydrate stability, but occurs only exceptionally at water depths where hydrates can form. As such, gas entering the hydrate stability field appears to form hydrates, acting as a buffer for gas migration towards the seafloor and subsequent escape.  相似文献   

Parametrization of turbulent fluxes over inhomogeneous landscapes   总被引：1，自引：0，他引：1  

G. N. Panin  Ch. Bernhofer 《Izvestiya Atmospheric and Oceanic Physics》2008,44(6):701-716

Reasons for the nonclosure of the heat balance in the atmospheric boundary layers over natural land surfaces are analyzed. Results of measuring the heat-balance components over different land surfaces are used. The Cabauw (Netherlands) data (obtained throughout 1996 over a grass surface with intermittent shrubs and single trees) and the data from the Anchor station in Germany (measured over coniferous forest in 2000–2001) are analyzed. In all, the analysis involves about fifty thousand independent values of the heat-balance components measured in the experiments, which should be indicative of the reliability of the results obtained in the paper. The data have shown that the heat balance is not closed and the imbalance is 50–250 W/m². The sum of the latent and sensible heat fluxes λE + H = STF is found to be systematically smaller than the difference between the net radiation and the heat flux into the ground R _n ? G. It is shown that the main cause of a systematic heat imbalance in the atmospheric boundary layers over inhomogeneous land surfaces is that the methods of surface-flux measurement and estimation are based on the theory that requires the hypothesis of stationarity and horizontal homogeneity. Direct data analysis has shown that the heat imbalance increases with landscape inhomogeneity. In the paper, a parametrization of the heat imbalance is carried out and the coefficient k _f (z ₀ ^ef /L ^ef ) is introduced as a measure of inhomogeneity. For this, data from the experiments FIFE, KUREX, TARTEX, SADE, etc., are also used. Empirical formulas are presented to refine the results of direct measurements and calculations of surface fluxes over natural (inhomogeneous) land surfaces from profile and standard (using bulk parametrizations) data. These formulas can also be used to determine surface fluxes over inhomogeneous underlying land surfaces in order to take into account so-called subgrid-scale effects in constructing prediction models.  相似文献   

International Conference and Young Scientists School CITES-2005     

A. V. Kislov  G. N. Panin 《Water Resources》2005,32(6):698-699

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On the parameterisation of evaporation and sensible heat exchange for shallow lakes   总被引：2，自引：0，他引：2  

G. N. Panin  A. E. Nasonov  Th. Foken  H. Lohse 《Theoretical and Applied Climatology》2006,85(3-4):123-129

Summary This paper demonstrates that typical air–sea interaction models can be transferred to shallow water conditions and lakes including a depth dependent function. As depth decreases, it is assumed that exchange conditions increase. From our results it follows that the model without the shallow water correction underestimates the latent and sensible heat fluxes of a lake by about 20%. This was shown through the comparison of the model with eddy covariance data for a shallow lake during the LITFASS-98 experiment in Germany. Furthermore, data selection according to the fetch and footprint conditions is presented. These models are also useful for gap filling procedures at measuring stations over lakes with limited fetch conditions in selected directions.  相似文献