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  • 2010-2014  (567,181)
  • 2011  (567,181)
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  • 1
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    Reconstruction of the Vegetation of Podporozhsky District (Leningrad Oblast, Russia) during the Holocene according to Pollen Analysis (2011)
    In:  (Master thesis), State University of St. Petersburg, Russia ; University of Hamburg, St. Petersburg, Russia ; Hamburg, 66 pp
    Details
    Publication Date: 2015-03-23
    Description: Sediment sequences retrieved from two coring sites at the Lake Novoe (Point N1 (60° 48.984´ N; 34° 57.718´W, depth – 2.7 m.); point N2 (60° 49.265´ N; 34° 57.451´ W, depth – 3.07 m), North-Eastern part of Podporozhsky district, Leningrad region, northwestern Russia, were analyzed for pollen analysis. Studied community passed through 5 stages in its development. Age control was calibrated by comparison of our pollen data to ones described in literature related to the same region (Onega Lake surroundings). Pollen data from ten cores were taken for this purpose. Birch woodlands, probably thinly-planted were widespread in Preborial stage (10 200-9300 years ago), then distinct change towards to warmer and more humid climatic conditions took place, open Pinus–Betula forest around the lake were gradually replaced by boreal forest with Picea, Pinus, Betula, Alnus incana and Corylus. This type of communities continued to dominate till the end of Boreal period (8000 years ago). The Atlantic period (8000 - 4600 years ago) was marked by increased abundance of broad-leaved species and thermiphyllic herbs. Quercus, Ulmus, Tilia and Corylus appeared in the area simultaneously. At the end of the Atlantic period broad-leafed woods began being replaced by spruce and pine-tree communities. Later, during the Subboreal (4600-2500 years ago), these processes continued. Subatlantic period (started 2500 years ago) marked by development of Pine woods with birch and willow. Coasts of the lake probably were covered with grasslands formed by Poaceae, Cyperaceae, and Asteraceae. Modern stage of community was studied by means of phytosocialogical descriptions along 4 km transect. Besides, pollen traps were set every 200 m through this transect. Nowadays forests of Piceeta-Pineta formation prevail within 70% of territory, 30% of it are covered by secondary wood communities with Betula, Alnus and Salix. Specter of trapped pollen reflected composition of plant communities satisfactory, with a value of 4.9 for grasslands and 7.7 (maximal – 9.1) in forests and shown the mean value about 5.7±2.3 which is of satisfactory correction.
    Type: Thesis , NonPeerReviewed
    Format: text
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  • 2
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    Vegetation Pattern Analysis in the HeiHe River Basin within the Framework of Long-Term Optimization Project of the Mountain River Flow, Province of Gansu (2011)
    In:  (Master thesis), State University of St. Petersburg, Russia ; University of Hamburg, St. Petersburg, Russia ; Hamburg, 39 pp
    Details
    Publication Date: 2015-03-10
    Description: The region of North-West of China is faced with different ecological problems, such as land degradation (mainly due to lack of water resources), desertification and water scarcity. The only reliable source of water supply for the arid low lands in the HeiHe river Basin is the water resources in the high elevation areas of the Qilian Mountains. Low land’s irrigation agriculture and urban water supply depend on the steadiness of water yield from the non-perennial tributaries in the source regions in the Qilian Mountains. To investigate the steadiness conditions and to stabilize the water yield from the Southern Qilian Mountains, German-Chinese project of “Long-term optimization of water yield from the Qilian Mountains to the HeiHe River basin by an integrated development of water protection forests and land-use” in province of Gansu have been started. Current Master Thesis research was accomplished in the frames this project. The task for the research was to perform fine resolution land-use map for the Southern Qiliqn Mountains and Middle Hexi corridor, which didn’t exist before. To implement the task of distant analysis of vegetation patterns Geographic Information Systems have been used. Multispectral image from Landsat-7 satellite, Thematic Mapper (TM ) and Enhanced Thematic Mapper Plus (ETM+) have been used with NDVI overlay and Shuttle Radar Topography Mission (SRTM) sensor (to produced DEM) as the additional data layers to implement multi-source land cover classification using a well-known Maximum Likelihood Classification (MLC) method. Free Open source SAGA GIS software was chosen to fulfill the task. Classification and interpretation of different landscape patterns, based on ecological and geomorphologic indicators from satellite imaginary data and intensive field investigations were performed. Based on it and supported with field ground-check GPS survey, Classification Map was developed. Also NDVI layer values were analyzed and show the changes in vegetation cover during the last 3 decades. The results of the work are important for further mapping assessment and high resolution Classification map processing, as well as for the purpose of hydrological modeling and meteorological downscaling in the Project research. Understanding of the current status, classification and spatial distribution of degraded land is very important issue all over the word and for the regional development of in the Heihe river basin in particular.
    Type: Thesis , NonPeerReviewed
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  • 3
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    Untersuchung einer Doline auf dem Zugspitzplatt: Ein palynologischer Beitrag zur holozänen Gletschergeschichte im Wettersteingebirge (2011)
    Copernicus
    Details
    Publication Date: 2011-03-07
    Description: Auf dem stark verkarsteten, nahezu vegetationslosen Zugspitzplatt im Wettersteingebirge (Nördliche Kalkalpen) gibt es in 2290 m Höhe eine Doline mit einer fast 1 m mächtigen Füllung aus lössähnlichem Feinsediment. Dieser Feinstaub enthält Pollen und Sporen in Mengen, die trotz der Lage des Untersuchungspunktes weit oberhalb der heutigen Waldgrenze ohne weitere Anreicherung für Pollenanalysen ausreichten. Trotz schlechter Pollenerhaltung konnten die basalen Schichten dieses Profils pollenanalytisch datiert werden. Das älteste Sediment wurde während des frühen Atlantikums, zur Zeit des thermischen Optimums des Holozäns, abgelagert. Eine AMS-Datierung bestätigt dies (7415 ± 30 BP). Seitdem wurde der Untersuchungspunkt nicht mehr von einem Gletscher überfahren. Der gut belegte Gletschervorstoss der Löbben-Schwankung (sog. Plattstand, zwischen 3400 und 3100 Jahren BP) hat die Doline gerade nicht mehr erreicht. Die bekannten holozänen Gletscherstände sind in einer Übersicht dargestellt. Die Zusammensetzung der Pollenspektren der beiden ältesten Proben und deren sehr hohe Pollenkonzentrationen erlauben den Schluss, dass die Entfernung der Doline zum Wald während des Atlantikums sehr viel geringer war als derzeit.
    Print ISSN: 0424-7116
    Electronic ISSN: 2199-9090
    Topics: Geosciences , History
    Published by Copernicus on behalf of Deutsche Quartärvereinigung.
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  • 4
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    Untersuchung einer Doline auf dem Zugspitzplatt (2011)
    Geozon Science Media
    Details
    Publication Date: 2022-08-02
    Description: Auf dem stark verkarsteten, nahezu vegetationslosen Zugspitzplatt im Wettersteingebirge (Nördliche Kalkalpen) gibt es in 2290 m Höhe eine Doline mit einer fast 1 m mächtigen Füllung aus lössähnlichem Feinsediment. Dieser Feinstaub enthält Pollen und Sporen in Mengen, die trotz der Lage des Untersuchungspunktes weit oberhalb der heutigen Waldgrenze ohne weitere Anreicherung für Pollenanalysen ausreichten. Trotz schlechter Pollenerhaltung konnten die basalen Schichten dieses Profils pollenanalytisch datiert werden. Das älteste Sediment wurde während des frühen Atlantikums, zur Zeit des thermischen Optimums des Holozäns, abgelagert. Eine AMS-Datierung bestätigt dies (7415 ± 30 BP). Seitdem wurde der Untersuchungspunkt nicht mehr von einem Gletscher überfahren. Der gut belegte Gletschervorstoss der Löbben-Schwankung (sog. Plattstand, zwischen 3400 und 3100 Jahren BP) hat die Doline gerade nicht mehr erreicht. Die bekannten holozänen Gletscherstände sind in einer Übersicht dargestellt. Die Zusammensetzung der Pollenspektren der beiden ältesten Proben und deren sehr hohe Pollenkonzentrationen erlauben den Schluss, dass die Entfernung der Doline zum Wald während des Atlantikums sehr viel geringer war als derzeit.
    Description: research
    Keywords: ddc:551.7
    Language: German
    Type: doc-type:article , publishedVersion
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  • 5
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    Thematic issue on how autophagosomes find their targets (2011)
    Taylor & Francis
    Details
    Publication Date: 2011-03-01
    Print ISSN: 1554-8627
    Electronic ISSN: 1554-8635
    Topics: Biology
    Published by Taylor & Francis
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  • 6
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    Relation of loess units and prehistoric find density in the Garzweiler open-cast mine, Lower Rhine (2011)
    Geozon Science Media
    Details
    Publication Date: 2021-05-07
    Description: Auf der Basis einer detaillierten Lössstratigraphie wurden auf dem Lössplateau des westlichen Niederrheins von einer Abbauwandgesamtfläche von 11.000qm die Anteile der wichtigsten Lösseinheiten berechnet. Darin nimmt der Brabant-Löss (spätes Jüngeres Hochwürm, MIS 2) 45% Anteil ein, also nahezu die Hälfte des vorhandenen Lösses, der Hesbaye-Löss (frühes Jüngeres Hochwürm, MIS2) etwa 5%. Ein Viertel des Lösses (25%) geht an den Keldach-Löss (Älteres Hochwürm, MIS4), nur wenig (1,5%) an den Rheingau-Löss (MIS 5). Dem Prä-Eem-Löss gehört das letzte Viertel (24%) desgesamten Lösses. Eine statistische Suche nach prähistorischen Funden erbrachte 131 paläolithische Knochen und Artefakte, die stratigraphisch genau zugeordnet werden konnten. Die Hauptmasse der Funde gehört den beiden Stadien MIS4 und MIS2 an – bemerkenswerterweise zwei kalten Perioden. Das Fehlen interglazialer Funde – solche sind vom übrigen Lössplateau durchaus bekannt – wird der starken periglazialen Abtragung und Einebnung in Plateauposition zugeschrieben. Die vorliegenden Funde belegen erstmals lokale Jagdaktivität während feuchter Perioden im Stadium MIS4. Ob die Funde aus dem MIS2 autochthon sind oder aus älteren Schichten aufgearbeitet wurden, muss offen bleiben.
    Description: research
    Keywords: 551.7 ; VAR 000 ; Glazialgeologie ; Lower Rhine ; loess budget ; prehistoric finds ; MIS 4 ; MIS 2 ; Geoarchaeology
    Language: English
    Type: article , publishedVersion
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  • 7
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    Relation of loess units and prehistoric find density in the Garzweiler open-cast mine, Lower Rhine (2011)
    Copernicus
    Details
    Publication Date: 2011-02-23
    Description: Auf der Basis einer detaillierten Lössstratigraphie wurden auf dem Lössplateau des westlichen Niederrheins von einer Abbauwandgesamtfläche von 11.000qm die Anteile der wichtigsten Lösseinheiten berechnet. Darin nimmt der Brabant-Löss (spätes Jüngeres Hochwürm, MIS 2) 45% Anteil ein, also nahezu die Hälfte des vorhandenen Lösses, der Hesbaye-Löss (frühes Jüngeres Hochwürm, MIS2) etwa 5%. Ein Viertel des Lösses (25%) geht an den Keldach-Löss (Älteres Hochwürm, MIS4), nur wenig (1,5%) an den Rheingau-Löss (MIS 5). Dem Prä-Eem-Löss gehört das letzte Viertel (24%) desgesamten Lösses. Eine statistische Suche nach prähistorischen Funden erbrachte 131 paläolithische Knochen und Artefakte, die stratigraphisch genau zugeordnet werden konnten. Die Hauptmasse der Funde gehört den beiden Stadien MIS4 und MIS2 an – bemerkenswerterweise zwei kalten Perioden. Das Fehlen interglazialer Funde – solche sind vom übrigen Lössplateau durchaus bekannt – wird der starken periglazialen Abtragung und Einebnung in Plateauposition zugeschrieben. Die vorliegenden Funde belegen erstmals lokale Jagdaktivität während feuchter Perioden im Stadium MIS4. Ob die Funde aus dem MIS2 autochthon sind oder aus älteren Schichten aufgearbeitet wurden, muss offen bleiben.
    Print ISSN: 0424-7116
    Electronic ISSN: 2199-9090
    Topics: Geosciences , History
    Published by Copernicus on behalf of Deutsche Quartärvereinigung.
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  • 8
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    Paleoceanographic Reconstruction of Surface Water Characteristics in the Northern North Atlantic During the Holocene and MIS 5 Using Planktic Foraminifera (2011)
    In:  (Master thesis), State University of St. Petersburg, Russia ; University of Hamburg, St. Petersburg, Russia ; Hamburg, 71 pp
    Details
    Publication Date: 2017-05-04
    Description: Paleoceanographic changes of surface water characteristics have been studied in the Nordic Seas during the Holocene and the Eemian warm periods as well as during late phases of preceding glacial periods based on a sediment core from the Iceland Sea. The age model is constrained for the Holocene by three accelerator mass spectrometry (AMS) 14C dates, correlation of some distinct and easily defined age points, obtained from the visual comparison of studied records with NPGRIP core and some tephra markers. The age model for MIS 5e is based on correlation of δ18O record to SPECMAP alongside with tephrochronolgy. Planktic foraminiferal assemblages were analyzed using the 〉150μm size fraction, foraminiferal δ13C and δ18O stable isotopes were measured on the polar planktic foraminifera N. pachyderma (s) for the Eemian period. According to high proportions of subpolar planktic forminifera (T. quinqueloba, G. bulloides, B. megastoma) during the late MIS 6, the presence of huge meltwater lids on the shelf of the Norwegian Sea was assumed resulting in deflecting of warm Atlantic water masses from its present circulation pattern towards the Iceland Sea. The proximity of the core to the Arctic and Polar fronts give possibility for their migration reconstruction. Hence, proxy records bear witness to the influence of cold fresh Polar water at the 6/5e boundary. The concomitant T. quinqueloba and B. megastoma (species that have different salinity tolerance) appearance alongside with low δ13C values evidence for subduction of warm and saline Atlantic water under fresh and cold surface water during the early part of the Last Interglacial. The same pattern is observed for the Holocene at about 10 ka cal. BP, corroborated by later T. quinqueloba appearance than G. bulloides, species that reflect Atlantic water masses. Cooling events during the periods of high solar insolation were noted and described in the current study for both interglacials. The observed reservoir ages for 8.2 – cold event is higher, by up to 200 years, than the standard model ocean. This could deflect incursions of Arctic water masses derived from the East Greenland Current to the Iceland Sea. The warmest part of the Holocene occurred in the early part (5.5-8 ka cal. BP) of the interglacial, when the insolation values were still high. In comparison the Last Interglacial 5e – ss warm period occurred with 8 ka delay only towards the end of interglacial when the isolation was low (118-122 ka cal. BP). This time lag could be explained by the huge Saalian ice sheets, inducing meltwater plumes that change the salinity gradients and resulted in easily sea ice formation. The Sea Surface Temperature (SST) reconstructions show similar values for the warmest intervals of the current and last interglacials (5oC and 2.5oC for summer and winter respectively).
    Type: Thesis , NonPeerReviewed
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  • 9
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    Evolution of Sand Ripples Under Oscillatory Flow (2011)
    In:  (Master thesis), State University of St. Petersburg, Russia ; University of Hamburg, St. Petersburg, Russia ; Hamburg, 91 pp
    Details
    Publication Date: 2015-03-27
    Description: So far a great number of scientific literature in field of geomorphology is published which deals with sand ripples, especially wave ripples, formed under oscillatory flow. The present work is a review of scientific literature on evolution of wave induced sand ripples. Principles of ripples formation and behavior in changing conditions, as well as classification, migration mechanisms and geometry features have been considered. Oscillatory motion which is responsible for generation of considered formation is explained. The thesis is aimed to make a theoretical basis for practical work of Ulrich Floth, PhD student in University of Rostock, a long term observations of evolution and migration of ripples over several months period in the coastal area of Baltic Sea by means of a customized underwater stereo-photogrammetric camera system.
    Type: Thesis , NonPeerReviewed
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  • 10
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    ∼2.7Ga juvenile crust formation in the North China Craton (Taishan-Xintai area, western Shandong Province): Further evidence of an understated event from U–Pb dating and Hf isotopic composition of zircon (2011)
    Elsevier
    Details
    Publication Date: 2011-04-01
    Print ISSN: 0301-9268
    Electronic ISSN: 1872-7433
    Topics: Geosciences
    Published by Elsevier
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