Investigations of the 500mb level in relation to the general circulation     

Huug M. van den Dool  Willem van Dijk 《Meteorology and Atmospheric Physics》1973,22(4):345-366

Summary The redistribution of kinetic energy in the 500mbar level is studied for 1966 as well as for 1967. The total kinetic energy is split up in three parts: a) the energy due to the mean flow, b) the energy due to eddies with a period of time longer than a month and c) the energy due to eddies with a period of time less than a month but longer than one day.The transport of these energies takes place in formally three different ways, namely by the mean flow, by longperiod and shortperiod eddies (or monthly and daily eddies).Both the transports in zonal and meridional direction are studied. As will be shown in section 2, this yields 16 transportterms. It turns out that for the 500mbar level in the region from 100°W to 30°E and from 30°N to 65°N and based on geostrophic approximated winds: a) the longperiod eddies are important, b) the role of the longperiod eddies as well as the role of the shortperiod eddies decreases with increasing latitude and c) the zonal transports and the divergence of those transports are mostly larger than the meridional transports, and the divergence of the meridional transports.

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Untersuchungen der 500 mbar-Fläche in bezug auf die allgemeine Zirkulation,

Zusammenfassung Die Verteilung der kinetischen Energie im 500mb-Niveau wird für die Jahre 1966 und 1967 untersucht. Die gesamte kinetische Energie wird dabei in drei Teile zergliedert: a) die kinetische Energie der mittleren Strömung, b) die Energie aus länger als einen Monat andauernden Wirbeln und c) die Energie aus kürzer als einen Monat, aber länger als einen Tag andauernden Wirbelelementen.Der Transport dieser Energien erfolgt formal auf drei verschiedenen Wegen, nämlich durch die mittlere Strömung, durch lang- und kurzperiodige Wirbelelemente (Turbulenzelemente von Monatsdauer bzw. von Tagesdauer). Es werden die Transporte in zonaler und in meridionaler Richtung untersucht; daraus ergeben sich 16 Transportterme. Für die Region von 100°W bis 30°E und 30°N bis 65°N erweist sich unter Zugrundelegung geostrophisch approximierter Winde, a) daß langperiodige Wirbel von Bedeutung sind, b) daß die Bedeutung langperiodiger wie auch kurzperiodiger Wirbelelemente mit zunehmender geographischer Breite abnimmt und c) daß die zonalen Transporte und ihre Divergenz meistens größer sind als die meridionalen Transporte und die Divergenz meridionaler Transporte.

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Scandium in rocks,minerals and sediments and its relations to iron and aluminium     

H. A. Das  J. Zonderhuis  H. W. van der Marel 《Contributions to Mineralogy and Petrology》1971,32(3):231-244

Scandium, aluminium and iron contents of a considerable number of rocks, minerals and sediments for various origin are given. They have been obtained by instrumental neutron activation analysis.The concentrations of these elements in rocks and minerals are very variable. However the Fe/Sc and Al/Sc ratios for the finer particles of sediments from different origins are fairly constant. At a spec. surf. of 100 m²/g is found 0.2 to 0.3 × 10⁴ for Fe/Sc and 0.60 to 0.95 × 10⁴ for Al/Sc (mol).In the coarser sediments there is a considerable influence of particle size. Consequently when Sc-contents of sediments are compared for classification purposes, their spec. surf. or granulometric composition should be determined as well.  相似文献   

GROUND WATER AND THE ENVIRONMENTAL MOVEMENT     

Ronald S. Boster 《Ground water》1971,9(1):2-4

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O-H stretching vibrations in kaolinite,and related minerals   总被引：1，自引：0，他引：1  

H. W. van der Marel  P. Krohmer 《Contributions to Mineralogy and Petrology》1969,22(1):73-82

The grades of ordering as represented by I.R. and X-ray spectra for platy kaolinite, fire clay mineral, ball clay, dickite, nacrite and tubular dehydrated halloysite samples of various origin, are related.Well ordered kaolinite, has four bands 3,693, 3,668, 3,652 and 3,620 cm^–1. In less ordered kaolinite, fire clay mineral and ball clay these bands have shifted a little or of the middle two, which are the weakest, only one band may be left (between brackets): less ordered kaolinite: 3,695, 3,667, 3,652 (3,653) and 3,620 cm^–1; fire clay mineral 3,696, 3,668, 3,653 (3,653) and 3,621 cm^–1; ball clay 3,697, 3,652 and 3,621 cm^–1.Dehydrated halloysite has 3,693–3,698, 3,668, 3,650–3,654 and 3,620–3,626 cm^–1 bands. In the most disordered dehydrated halloysite samples (Martinsberg and Baia Mare) only two bands are left at 3,696 and 3,624 cm^–1.Dickite has four bands: 3,708, 3,656, 3,627 and 3,622 cm^–1. For the lesser ordered Mexico sample it is 3,701, 3,652, 3,627 and 3,621 cm^–1. Nacrite also has four bands i.e.: 3,700, 3,650, 3,627 and 3,620 cm^–1.There is, apart from orientation effects, a wide variation in the absolute and especially in the relative intensities of the I.R. bands and X-ray reflections for each of the mineral groups investigated here, but of various origin. The need of a nomenclature adapted to the level of our knowledge about this matter to day and comprising all these variations included those in morphology is emphasized.Quantitative analyses, the adjective meant in the sense of an accuracy of minimal 5%, constitute a difficult problem which is perhaps even wholly impossible to solve with the conventional methods of today.  相似文献   

The annual march of the topoclimatic spatial patterns of net radiation in southern California     

Prof. Werner H. Terjung  Ronald N. Kickert  Ronald J. Kochevar  Jack P. Mrowka  Simon O. Ojo  Gerald L. Potter  Stanton E. Tuller 《Theoretical and Applied Climatology》1969,17(1):21-50

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Modeling Advective Contaminant Transport During Soil Vapor Extraction   总被引：3，自引：0，他引：3  

Ronald W. Falta  Karsten Pruess  Dwayne A. Chesnut 《Ground water》1993,31(6):1011-1020

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The efficiency of the conversion of solar energy into wind energy by means of Hadley cells   总被引：1，自引：0，他引：1  

A. De Vos  P. van der Wel 《Theoretical and Applied Climatology》1993,46(4):193-202

Summary In the present paper, we apply endoreversible thermodynamics in order to calculate the upper bound for the fraction of solar energy absorbed by the Earth, that can be converted into the mechanical energy present in the atmosphere. We assume the presence of six Hadley cells in the Earth's wind system and find an upper limit of 1.17%. For Mars we assume a single Hadley cell and find an upper limit of 0.87%.With 10 Figures  相似文献   

Upstream stagnation points in stratified flow past obstacles     

Peter G. Baines  Ronald B. Smith 《Dynamics of Atmospheres and Oceans》1993,18(1-2)

An experimental study has been made of stagnation points and flow splitting on the upstream side of obstacles in uniformly stratified flow. A range from small to large values of Nh/U (where N is the buoyancy frequency, h_m is the maximum obstacle height and U is the undisturbed fluid velocity) has been covered, for three obstacle shapes which are, respectively, axisymmetric, and elongated in the across-stream and in the downstream directions. Upstream stagnation for the first two of these models does not occur until Nh_m/U > 1.05, where it occurs at z ≈ h_m/2. On the central line below this point the flow descends and diverges, and we term this ‘flow splitting’. For the third model (elongated in the downstream direction), stagnation upstream first occurs at Nh_m/U ≈ 1.43, at z ≈ 0. Results for this obstacle are not consistent with the ‘Sheppard criterion’, and this upstream flow stagnation is not apparently related to lee wave overturning, in contrast to flow over two-dimensional obstacles.  相似文献   

Blocking and trapping of waves in an inhomogeneous flow     

Steven R. Long  Ronald J. Lai  Norden E. Huang  Geoffry R. Spedding 《Dynamics of Atmospheres and Oceans》1993,20(1-2)

The blocking and trapping of waves and wave packets by inhomogeneous flow fields were studied in a laboratory setting. Evidence for multiple reflections and thus trapping within the current gradient zone near the blocking point are the main results obtained, and lead to the following conclusions: (1) a strong current gradient zone near the blocking point can trap wave energy, which will shift the wavenumbers into the capillary region, to match the microwave wavelength of many remote sensing instruments; (2) this mechanism provides a direct link between strong current gradient zones (bathymetric features in tidal flows, eddies, current boundaries, etc.) and the surface wave structure, which in turn allows instruments such as the Synthetic Aperture Radar (SAR) to form images of bottom features based solely on the small wave conditions; (3) an indication of direct energy transfer from the carrier waves to low-frequency waves was also observed, and resolved by wavelet analsysis. The instantaneous spectra from wavelet analysis reveal that a large portion of wave energy transfers directly into the low-frequency band from the carrier waves at the trapping zone. Subharmonics may play a critical role in the energy transfer process, but details are still to be established.  相似文献   

Editorial. The IGU-COMTAG international symposium on the geomorphology of active tectonic areas—rende (Calabria), 31 May-9 June 1990     

Marino Sorriso-Valvo  Theodore van Asch 《地球表面变化过程与地形》1993,18(3):177-180

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