Höhenwinde auf dem Seeweg Kapverdenregion — La Plata     

Prof. Dr. Erich Kuhlbrodt 《Pure and Applied Geophysics》1952,21(1):19-31

Zusammenfassung Durch die Deutsche Atlantische Expedition auf «Meteor» 1925–27 und das maritim-aerologische Werk der Deutschen Seewarte wurden zahlreiche Höhenwindmessungen auf dem Atlantischen Ozean gewonnen. Die Bearbeitung dieses Materials, für das Gebiet südlich von 20° Nordbreite und die Messungen bis 1937, geschieht im Rahmen des Meteorwerkes, in Band XVI als Fortsetzung von Band XV-Kriegsereignisse und Schwierigkeiten der Nachkriegszeit haben die Veröffentlichung leider stark verzögert. Für die vorliegende Mitteilung werden einige Teilergebnisse ausgewählt, die sich auf den Seeweg nach Südamerika beziehen; als Beitrag zur Gewinnung erforderlicher quantitativer Daten über die allgemeine Zirkulation.Für die Höhenstufen 4–5, 9–10 und 14–15 km werden die mittleren Windelemente und die Streuung der Windgeschwindigkeiten behandelt. Es wird die Schichtung der Luftströmungen im Vertikalprofil des Seeweges für 0–15 km Höhe gegeben. Auf die Struktur des Urpassates (der tropischen Ostströmung) und der tropischen Westwindschicht der hohen Troposphäre in den verschiedenen Jahreszeiten wird näher eingegangen.

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Summary By the German Atlantic Expedition on the «Meteor», 1925–1927, and the marine-aerological work of the Deutsche Seewarte numerous upper air wind measurements were gained from the Atlantic. The evaluation of this material for the area in the south of 20° northern latitude and of the measurements up to 1937 is done within the scale of the «Meteorwerk», vol. XVI as a continuation of vol. XV. In consequence of war events and the difficulties of the time after the war the publication has been delayed considerably. For the information on hand, some partial results are selected which refer to the route to South America; as a contribution for gaining necessaryquantitative data on the general circulation.For the levels 4–5, 9–10, and 14–15 km the average wind elements and the dispersion of the wind velocities are treated. The stratification of air currents in the vertical profile of the route is given for the height of 0–15 km. It is entered into particulars of the structure of the «Urpassat» (tropical easterlies), and the tropical West-wind layer of the upper troposphere in various seasons.

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Adolf v. Koenen hundert Jahre     

Erich Haarmann 《International Journal of Earth Sciences》1937,28(1-2):81-83

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Bücher- und Zeitschriftenschau     

Erich Haarmann  Wilckens 《International Journal of Earth Sciences》1934,25(4):296-304

Ohne Zusammenfassung  相似文献   

Supportive elements to the decision-making process in the emergency planning of the Angra dos Reis Nuclear Power Complex,Brazil     

Corbiniano Silva  Luiz Claudio Gomes Pimentel  Luiz Landau  Paulo Fernando Lavalle Heilbron Filho  Fabiana Guimarães Resende Gobbo  Pryscila de Jesus de Sousa 《Environmental Earth Sciences》2017,76(3):133

Accidents in nuclear power plants are problems of great complexity, mainly due to their consequences, such as the population evacuation from the enterprise influence area. The decision-making and emergency plans must be well articulated and require good local geographic space knowledge and the interactions of their environments. This study is a contribution to the emergency plans for the Almirante Álvaro Alberto Nuclear Power Plant, currently the only nuclear complex in Brazil, located in Angra dos Reis, Rio de Janeiro. The study confirmed the region’s main geoenvironmental aspects as winds and rainfall, landslides and population density were evaluated as important elements in the local emergency process. Their integrated analysis supported scenario identification and critical regional points and highlighted population evacuation escape routes. These important results characterized the support to local emergency management actions and guidelines. Furthermore, the geographic information systems was configured as an integrated spatial and temporal analysis platform to associate meteorological, geological/geomorphological and socio-economic data, playing a key role to support the evacuation planning in the event of nuclear power plant accidents.  相似文献   

Fusion of multi‐resolution surface (terrestrial laser scanning) and subsurface geodata (ERT,SRT) for karst landform investigation and geomorphometric quantification     

Christoph Siart  Markus Forbriger  Erich Nowaczinski  Stefan Hecht  Bernhard Höfle 《地球表面变化过程与地形》2013,38(10):1135-1147

A multi‐method research design based on terrestrial laser scanning, GIS, geophysical prospecting (electrical resistivity tomography, refraction seismics) and sedimentology is applied for the first time to investigate enclosed karst depressions in an integrated way. Fusing multi‐resolution surface and subsurface geodata provides profound insights into the formation, geometry and geomorphologic processes of dolines. The studied landforms, which are located in the Dikti Mountains of East Crete, are shown to be filled by loose sediments of thicknesses of up to 30 m that mainly consist of fine‐grained material overlying solid bedrock at depths below 35 to 45 m. By combining subsurface observations with geomorphometric calculations, local doline genesis can be traced back to initial collapse of fractured bedrock followed by subsequent infilling with colluvials. In order to define crucial methodological requirements and guidelines for data fusion, both the impact of different elevation models and the influence of data resolution are assessed. Surface volumes of depressions derived by the digital surface model are 7–21% higher than the results obtained from the terrain model due to vegetation. Similarly, estimates of infill volume calculated on the basis of geophysical outcomes and elevation data differ by up to 13%. Calculations of the landforms' current volumes (i.e. total surface and subsurface volume), however, are fairly insensitive to raster resolution. Hence, the distinct geomorphologic properties of landforms (e.g. shape, terrain roughness, slope inclination) substantially determine the geomorphometric analysis of both surface and subsurface data. As shown by the findings, data fusion to integrate digital terrain, geophysical and sedimentological datasets of varied resolutions benefits geomorphologic studies and helps provide a comprehensive image of landforms. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

Historical and future anthropogenic emission pathways derived from coupled climate�Ccarbon cycle simulations     

Erich Roeckner  M. A. Giorgetta  T. Crueger  M. Esch  Julia Pongratz 《Climatic change》2011,105(1-2):91-108

Using a coupled climate?Ccarbon cycle model, fossil fuel carbon dioxide (CO₂) emissions are derived through a reverse approach of prescribing atmospheric CO₂ concentrations according to observations and future projections, respectively. In the second half of the twentieth century, the implied fossil fuel emissions, and also the carbon uptake by land and ocean, are within the range of observational estimates. Larger discrepancies exist in the earlier period (1860?C1960), with small fossil fuel emissions and uncertain emissions from anthropogenic land cover change. In the IPCC SRES A1B scenario, the simulated fossil fuel emissions more than double until 2050 (17 GtC/year) and then decrease to 12 GtC/year by 2100. In addition to A1B, an aggressive mitigation scenario was employed, developed within the European ENSEMBLES project, that peaks at 530 ppm CO₂(equiv) around 2050 and then decreases to approach 450 ppm during the twenty-second century. Consistent with the prescribed pathway of atmospheric CO₂ in E1, the implied fossil fuel emissions increase from currently 8 GtC/year to about 10 by 2015 and decrease thereafter. In the 2050s (2090s) the emissions decrease to 3.4 (0.5) GtC/year, respectively. As in previous studies, our model simulates a positive climate?Ccarbon cycle feedback which tends to reduce the implied emissions by roughly 1 GtC/year per degree global warming. Further, our results suggest that the 450 ppm stabilization scenario may not be sufficient to fulfill the European Union climate policy goal of limiting the global temperature increase to a maximum of 2°C compared to pre-industrial levels.  相似文献   

The impact of logging on the surrounding flow in a managed forest     

Gengsheng Zhang  Monique Y. Leclerc  Anandakumar Karipot  Henrique F. Duarte  Erich Mursch-Radlgruber  Henry L. Gholz 《Theoretical and Applied Climatology》2011,106(3-4):511-521

The influence of a freshly logged area in a managed pine forest on the flow field is investigated by comparing sodar wind profile data over the forest canopy with the synoptic wind field extracted from North American Regional Reanalysis, National Centers for Environmental Prediction. As a consequence of the pressure gradient arising from the sharp temperature difference between the clearcut and the surrounding uncut forests, the local wind direction over the forest measured with the sodar departs dramatically from the prevailing synoptic wind direction when the latter is transverse to the clearcut-sodar direction. Sodar measurements also indicate systematic strong updrafts during daytime followed by nighttime downdrafts with wind coming from the logged area. This suggests the presence of horizontal advection carrying daytime warm air (or nighttime cool air) from the clearcut to the forested area. This paper also examines the influence of wind velocity, clearcut fetch, and solar radiation on locally generated circulations and advection. The presence of local circulations arising from contrasting neighboring surface characteristics well outside the footprint is of particular relevance for atmospheric flux sites where robust surface?Catmosphere exchange values are sought. This study highlights the high level of circumspection required at the time of identifying locations for flux sites. It also suggests vigilant monitoring of the surrounding landscape during eddy?Cflux measurements particularly in actively managed landscapes.  相似文献   

Lippmann Diagrams: Theory and Application to Carbonate Systems     

Heinz Gamsjäger  Erich Königsberger  Wolfgang Preis 《Aquatic Geochemistry》2000,6(2):119-132

Since 1980 when F. Lippmann's seminal paper appeared, ourunderstanding of solubility equilibria involving ionic solidsolutions has been advanced by theoretical considerations as wellas careful experimental studies designed to determine excess Gibbsfunctions. A unified theory of solid-solution aqueous-solutionequilibria as well as the thermodynamic background of thephenomenon of ``stoichiometric saturation' are reviewed.It is shown that Lippmann diagrams effectively summarize thethermodynamic basis of solid-solute aqueous-solution equilibria ofsparingly soluble metal carbonate systems. Clearly, the predictivepower of these diagrams may be limited due to kineticrestrictions. Only when dissolution and precipitation areessentially reversible, favourable conditions to synthesizehomogeneous solid phases can be derived from studies of equilibria.  相似文献   

Urban citizenship in the global south: Critical reflections on the tactics and counter-tactics of the urban poor     

Redento B. Recio  Erich Wolff  Ashraful Alam  Sanjeev Routray  Eric Gaisie  Adriana Marin-Toro  Ishita Chatterjee  Nabanita Islam 《New Zealand geographer》2023,79(1):46-53

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Field Sampling of Residual Aviation Gasoline in Sandy Soil     

David W. Ostendorf  Lowell E. Leach  Erich S. Hinlein  Yuefeng Xie 《Ground Water Monitoring & Remediation》1991,11(2):107-120

Two complementary field sampling methods for the determination of residual aviation gasoline content in the contaminated capillary fringe of a fine, uniform, sandy soil were investigated. The first method featured field extrusion of core barrels into pint-size Mason jars, while the second consisted of laboratory partitioning of intact stainless steel core sleeves. The barrel extrusion procedure involved jar headspace sampling in a nitrogen-filled glove box, which delineated the 0.7m thick residually contaminated interval for subsequent core sleeve withdrawal from adjacent boreholes. Soil samples removed from the Mason jars (in the field) and sleeve segments (in the laboratory) were subjected to methylene chloride extraction and gas chromatographic analysis to compare their aviation gasoline content. The barrel extrusion sampling method yielded a vertical profile with 0.10m resolution over an essentially continuous 5.0m interval from the ground surface to the water table. The sleeve segment alternative yielded a more resolved 0.03m vertical profile over a shorter 0.8m interval through the capillary fringe. The two methods delivered precise estimates of the vertically integrated mass of aviation gasoline at a given horizontal location, and a consistent view of the vertical profile as well. In the latter regard, a 0.2m thick lens of maximum contamination was found in the center of the capillary fringe, where moisture filled all voids smaller than the mean pore size. The maximum peak was resolved by the core sleeve data, but was partially obscured by the barrel extrusion observations, so that replicate barrels or a half-pint Mason jar size should be considered for data supporting vertical transport analyses in the absence of sleeve partitions.  相似文献