Neotectonic evolution of the Anaximander Mountains at the junction of the Hellenic and Cyprus arcs     

Johan H. ten Veen  John M. Woodside  Tiphaine A.C. Zitter  Jean F. Dumont  Jean Mascle  Anna Volkonskaia 《Tectonophysics》2004,391(1-4):35

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Transport of Temperature and Humidity Variance and Covariance in the Marine Surface Layer   总被引：3，自引：3，他引：0  

Anna M. Sempreviva  Jørgen Højstrup 《Boundary-Layer Meteorology》1998,87(2):233-253

In this paper we address the budget of potential temperature T and moisture mixing ratio q variances as well as the q-T covariance budget. We focus on the vertical transport and study the quantities contained in these terms. Estimates of transport terms are rare and to the best of our knowledge they have never been shown together in the literature. For this purpose an extensive set of humidity and temperature turbulence data from two heights in a marine environment has been analysed. We discuss and compare our results with results from earlier studies for a range of stability from near-neutral to unstable. Similarity and differences between T and q behaviour in the surface layer over water are presented.  相似文献   

地磁场总强度空间线性相关在预报武定,丽江强震中的应用及机理   总被引：1，自引：0，他引：1  

杜安娜 《地震》1998,18(3):308-312

介绍了地磁场空间线性相关的计算方法。详细阐述了利用此方法在预报武定地震 (1 995年 1 0月 2 4日 ,MS6.5)及丽江地震 (1 996年 2月 3日 MS7.0 )中的应用。笔者对此方法进行了理论推导 ,结果表明相关参量与台站经纬度的选择有关 ,而地磁场的空间线性相关的规律与台站的经纬度选择无关。该结果对台组的选择起到了指导作用  相似文献   

Extinction versus backscatter relationships for lidar applications at 351 nm: maritime and desert aerosol simulations and comparison with observations     

Francesca Barnaba  Ferdinando De Tomasi  Gian Paolo Gobbi  Maria Rita Perrone  Anna Tafuro 《Atmospheric Research》2004,70(3-4):229-259

Functional relationships linking at λ₀=351 nm aerosol extinction α_λ0^aer and backscatter coefficient β_λ0^aer of maritime and desert type aerosols are determined to allow for inversion of the single-wavelength lidar signals. Such relationships are derived as mean behavior of 20,000 extinction versus backscatter computations, performed for aerosol size distributions and compositions whose describing parameters are randomly chosen within the naturally observed variability. For desert-type aerosols, the effect of the particle non-sphericity is considered and it is shown that the extinction to backscatter ratio of non-spherical dust particles can be up to 60% larger than the values obtained for spherical particles. Aerosol extinction and backscatter coefficient profiles obtained inverting the single-wavelength lidar signal with the modeled relationships are then compared to the same profiles measured by a combined elastic-Raman lidar operating at 351 nm. Analytical back trajectories and satellite images are used to characterize advection patterns during lidar measurements and to properly choose the modeled functional relationship. A good accordance between the two techniques is found for advection patterns over the lidar site typical of maritime and dust conditions. Maximum differences between the model-based α_λ0^aer and β_λ0^aer vertical profiles and the corresponding ones measured by the combined elastic-Raman lidar technique are of 30% and 40% in maritime and desert dust conditions, respectively. The comparison of elastic-Raman lidar measurements and model-based results also reveals that particle non-sphericity must be taken into account when mineral dust-type aerosols are directly advected over the measurement site.  相似文献   

Zoosporic aquatic fungi growing on dead specimens of 29 freshwater crustacean species   总被引：1，自引：0，他引：1  

Bazyli Czeczuga  Mariola Koz&#x;owska  Anna Godlewska 《Limnologica》2002,32(2)

The authors investigated aquatic fungi growing on the carapaces of 29 species of dead crustaceans (13 species of Copepoda, 13 species of Cladocera and 3 species of Ostracoda) in the water from six limnological and trophical different water bodies (two springs, one river, one lake and two ponds). All of these waterbodies are strongly loaded. 146 species of aquatic fungi were found on the carapaces: 40 Chytridiomycetes, 1 Hyphochytriomycete and 105 Oomycetes. The most common fungus species were Karlingia chitinophila, Myzocytium microsporum, Myzocytium zoophthorum, Pythium acanthicum, Pythium butleri and Pythium myriotylum. Most zoosporic fungus species were observed on the specimens of Daphnia pulex (50 fungus species), Daphnia magna (48) and Cyclocypris laevis (44), fewest on Cyclops fuscus and Cyclops vicinus (each 10).The most fungi were growing in the water from River Supraśl (86), the fewest in the water from Pond Fosa (53). Cluster analysis of the investigated parameters carried out in water bodies during the experiment on zoosporic fungus species has revealed that in the water from springs and Pond Fosa the number of fungus species is closely associated with the concentration of sulphates, in water from River Supraśl and Lake Komosa with calcium and in the water from Pond Dojlidy with chlorides. Out of these 146 species, 21 are known as parasites or necrotrophs of fish. Some dead specimens of crustacean species are a new substrate for some fungus species.  相似文献   

Paleo-environmental and volcano-tectonic evolution of the southeastern flank of Mt. Etna during the last 225 ka inferred from the volcanic succession of the ‘Timpe’, Acireale, Sicily     

Rosa Anna Corsaro  Marco Neri  Massimo Pompilio   《Journal of Volcanology and Geothermal Research》2002,113(1-2)

The tectonic escarpments locally known as ‘Timpe’ cut a large sector of the eastern flank of Etna, and allow an ancient volcanic succession dating back to 225 ka to be exposed. Geological and volcanological investigations carried out on this succession have allowed us to recognize relevant angular unconformities and volcanic features which are the remnants of eruptive fissures, as well as important changes in the nature, composition and magmatic affinity of the exposed volcanics. In particular, the recognition in the lower part of the succession of important and unequivocal evidence of ancient eruptive fissures led us to propose a local origin for these volcanics and to revise previous interpretations which attributed their westward-dipping to the progressive tectonic tilting of strata. These elements led us to reinterpret the main features of the volcanic activity occurring since 250 ka BP and their relationship with tectonic structures active in the eastern flank of Etna. We propose a complex paleo-environmental and volcano-tectonic evolution of the southeastern flank of Mt. Etna, in which the Timpe fault system played the role of the crustal structure that allowed the rise and eruption of magmas in the above considered time span.  相似文献   

Peat-forming environments of Westphalian A coal seams from the Lower Silesian Coal Basin of SW Poland based on petrographic and palynologic data     

Grzegorz J. Nowak  Anna Grecka-Nowak 《International Journal of Coal Geology》1999,40(4):15

The petrographic and palynologic compositions of coal seams of the acler formation (Upper Carboniferous, Westphalian A) from northwestern and southeastern part of the Lower Silesian Coal Basin (LSCB) were examined. Coals studied are highly volatile bituminous coal, where R_o ranges from 0.91% to 1.09%. Seam 430 from the northwestern part of the basin contains high vitrinite percentage with rather low inertinite and liptinite contents, while percentage of mineral matter is variable. This petrographic composition is associated either with a predominance of Lycospora in miospore assemblage, or with a miospore assemblage of mixed character. The abundance of Lycospora reflects vegetation composed of the arborescent lycopsids while the mixed miospore assemblage is connected with diverse palaeoplant communities, namely, arborescent lycopsids, calamites and ferns. Seams 409 and 412/413 from the southeastern part of the LSCB are rich in inertinite and liptinite, while the vitrinite content is moderate. Their characteristic feature is the occurrence of a diagnostic crassisporinite (densosporinite). Amount of the mineral components in these coals is very low. Densosporites and related crassicingulate genera are main components of these miospore assemblages and were produced by herbaceous and/or sub-arborescent lycopsids. These petrographic and palynologic features were the basis for distinguishing three maceral–miospore associations: an arborescent lycopsid and mixed associations, occurring in the seam 430 and a herbaceous and/or sub-arborescent lycopsid association which was recorded in seams 409 and 412/413. The first two assemblages are interpreted as having been deposited in a planar rheotrophic mire, whereas the herbaceous and/or sub-arborescent lycopsid association is thought to have developed in an ombrotrophic, domed mire.  相似文献   

The “schizohaline” environment: Its sedimentary and diagenetic fabrics as exemplified by Late Paleozoic rocks of Bear Island,Svalbard     

Robert L. Folk  Anna Siedlecka 《Sedimentary Geology》1974,11(1):1-15

Environments characterized by fluctuating hypersaline to fresh-water conditions are defined as “schizohaline” and examples are given of situations in which “schizohaline” environments can arise. Fabrics diagnostic for the occurrence of both hyper- and hyposalinity have been recorded in Late Paleozoic rocks from Bear Island (74°30′N, 19°E): evaporite nodules, length-slow chalcedony and very finely crystalline penecontemporaneous dolomite are considered as indicators of hypersaline conditions while euhedral limpid dolomite crystals, coarse poikilitic sparry calcite and microspar calcite are thought to have originated under the hyposaline regime. Zoned dolomite crystals and euhedral crystals of authigenic mega-quartz replacing sulphates have also been recorded in the same rocks; their diagnostic importance for the schizohaline environment is, however, uncertain.Internal structural pores of some crinoid and bryozoan skeletal grains of biosparites from Bear Island are either empty or infilled with very finely crystalline dolomite. Expulsion of Mg²⁺ ions from the magnesian-calcite skeletons and either: (1) “poisoning” of the micro-environment of the pores; or (2) formation of stagnant “micro-sabkha” conditions in the pores are proposed as an explanation for these phenomena.  相似文献   

Die Verteilung des SO2-Gehaltes der Luft im Stadtgebiet von Wien     

Anna Bangerl  Ferdinand Steinhauser 《Theoretical and Applied Climatology》1959,10(1):132-153

Zusammenfassung An zahlreichen über das ganze Stadtgebiet von Wien verteilten Beobachtungsstellen wurden vom September 1956 bis September 1957 an je vier Wochen lang ausgesetzten, mit einem Absorptionsmittel getränkten Baumwollappen SO₂-Ablagerungen gesammelt. Die gefundenen SO₂-Mengen zeigen eine stark unterschiedliche Verteilung im Stadtbereich und einen deutlichen Jahresgang mit einem Maximum im Winter und einem Minimum im Juli. Der Einfluß meteorologischer Faktoren auf den SO₂-Gehalt der Luft und seine Änderungen wird unter besonderer Berücksichtigung der orographischen Verhältnisse und örtlicher SO₂-Quellen eingehend diskutiert. Abschließend wird auch über eine Analyse von Schneeproben auf berichtet.

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Summary During the period September 1956 to September 1957 the amount of SO₂ deposited from the atmosphere was observed at numerous locations in the town of Vienna. The observations were made by means of cotton rags, soaked with an absorbing chemical, and each rag was exposed for four weeks. The amounts of SO₂ show great differences within the area, and a pronounced annual variation, with a maximum in winter and a minimum in July. The influence on the SO₂ content of the air of meteorological factors is discussed in detail, with special regard to variations by orographic conditions and local SO₂ sources. Additional determinations on snow samples are reported.

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Résumé Des prélèvements de SO₂ par absorption sur des bandes de coton imprégné, laissées sur place pendant quatre semaines, ont été faits en de nombreux endroits de l'agglomération viennoise de septembre 1956 à septembre 1957. Les quantités de SO₂ varient beaucoup selon les endroits et la saison; elles sont maximum en hiver et minimum en juillet. Etude des facteurs météorologiques agissant sur la répartition du gaz en tenant compte en particulier du relief et des sources locales d'anhydride sulfureux. On a également déterminé la teneur de d'échantillons de neige.

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Mit 4 Textabbildungen  相似文献   

Data rescue in manuscripts: a hydrological modelling study example     

Xuan Yu  Anna Lamačová  Lele Shu  Christopher Duffy  Pavel Krám  Jakub Hruška 《水文科学杂志》2020,65(5):763-769

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