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Showing 1 to 20 of 97 for “"aeolian"”.
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Small Scale Aeolian Processes and Landform Response
… three subjects concerning small-scale aeolian processes and landforms: 1) the mechanisms of the low-energy creep mode of sand motion, especially the proportion of creep relative to the total transport within the aeolian system; 2) a method to efficiently delineate grainflow boundaries …
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Aeolian dust emission dynamics across spatial scales: landforms, controls and characteristics
Variable erodibility (surface characteristics) and erosivity factors (meteorological conditions) result in dust emission dynamics being complex in both space and time. Accounting for localscale surface variability is critical to our understanding of dust emitting processes. This study identifies …
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Archives of climate variability on Kiritimati: lacustrine, aeolian and remote sensing perspectives
… not limited to the scope of lacustrine records. Aeolian sedimentary archives are a less common approach to documenting tropical hydroclimate variability but given the profound impact of the ocean-atmosphere system on Kiritimati, aeolian archives provide a unique opportunity to test the role of …
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Aeolian sand movement in an arid linear dune ecosystem, Nizzana, Western Negev, Israel
In a three-year study the current aeolian transportation processes were examined in a linear dune area previously used for grazing near Nizzana at the Israeli-Egyptian border. The research area was subject to heavy grazing across the border, which led to the total destruction of the natural …
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Seismic chacterization of Vulcano island and Aeolian area by tectonic and seismo-volcanic events
… events, recorded at La Fossa crater of Vulcano (Aeolian Islands, Italy) during 2004-2009, and the dynamics of the hydrothermal system. During the period of study, six episodes of increasing numbers of seismo-volcanic events took place at the same time as geothermal and geochemical anomalies were …
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Effects of human development on aeolian sediment transport rates within an adjacent undeveloped backshore enclave
… fetch length (39 m) also contributed to lower aeolian sediment transport within the enclave. These results suggest that foredune growth within an enclave may require human intervention to reach adequate size for shore protection.
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Geology of Aeolian and marine deposits in the Saldanha Bay region, Western Cape, South Africa
The west coast of South Africa has been exploited for diamonds for most of the last century. Although some literature has accumulated over this period, the evolution of the coastal plain since the Cainozoic remains poorly understood. The aim of this thesis is to offer a multidisciplinary study of …
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Quantifying Sphagnum spp. presence and distribution along a gradient in aeolian mineral deposition in Icelandic mires
Aeolian dust deposition has been shown to affect natural ecosystems in different ways, for instance by increasing soil’s bulk density and mineral content, leading to shifts in vegetation. Due to Iceland frequent volcanic eruptions and vast sandy deserts and eroded areas, in combination with strong …
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Bacterioplankton dynamics in surface waters of the north-eastern (sub-)tropical Atlantic Ocean affected by Aeolian dust
… perturbations in terms of wind driven mixing and Aeolian dust deposition.<br/>Firstly, the region’s surface water bacterioplankton community was compared with adjacent<br/>regions in terms of metabolic activity, by measuring the uptake rates of radioactively labelled<br/>amino acids (3H-leucine …
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Documenting Magnatic Processes at Filicudi Island, Aeolian Arc, Italy: Integrating Quantitative Modeling and Plagioclase Textural and in situ Compositional Data
<p>Documenting the physiochemical processes that influence magma composition is critical for forecasting eruption styles and managing volcanic hazards. Compositional diversity of magmas develops through recharge, assimilation, and fractional crystallization (RAFC) within subvolcanic magma …
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Documenting the Origin of Compositional Diversity of Subduction Zone Magmatism, Alicudi, Aeolian Arc (Southern Tyrrhenian Sea, Italy) Using in situ Plagioclase Data
<p>Processes that generate magma compositional diversity are important to document because composition affects degree of explosivity, which impacts hazard mitigation. Magnesium to silicon rich magmas are produced by processes such as magma recharge, assimilation, and fractional crystallization …
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Sand ramps or climbing dunes? : identification and palaeoenvironmental significance of aeolian deposits in the Southern Kalahari and Breede River valley, South Africa
… against topographical barriers as a result of aeolian processes. They are therefore classified as climbing dunes rather than sand ramps. Three optically stimulated luminescence dates were determined for a topographical dune from each study region. Samples from the Prynnsberg 2 dune in the …
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Landscape scale measurements of wind erosion of volcanic materials in the Hekla area
… of the present study were to i) measure aeolian sand transport on a landscape scale, ii) to estimate the effect of environmental factors on sand transport and iii) estimate the effect of reclamation efforts on wind erosion. The research area, north of Hekla in South Iceland, extends …
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Ephemeral river systems at the Skeleton Coast, NW-Namibia - Sedimentological and geomorphological studies on the braided river dominated Koigab Fan, the Cenozoic succession in the Uniabmond area and comparative studies on fluvio-aeolian interaction between ephemeral rivers and the Skeleton Coast Erg
… area and 3) comparative studies of fluvio-aeolian interaction between five ephemeral rivers and the Skeleton Coast Erg. Sedimentological and geomorphological investigations show that the Koigab Fan represents a yet undocumented type of a braided fluvial fan system, which operates in an arid …
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PALEOPEDOLOGY AND PALEOGEOMORPHOLOGY OF THE EARLY OLIGOCENE ORELLA AND WHITNEY MEMBERS, BRULE FORMATION, WHITE RIVER GROUP, TOADSTOOL GEOLOGIC PARK, NEBRASKA
… and lacustrine facies that yield to aeolianites. To test whether this shift in sedimentation style was driven by climate change, 20 paleosols from 8 profiles were analyzed from the fluvial-aeolian Orella Member through the aeolian-dominated Whitney Member of the earliest Oligocene …
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The sedimentology of diamondiferous deflation deposits within the Sperrgebiet, Namibia
… and 28 degrees South. Salt rock weathering and aeolian abrasion has eroded elongated depressions that are up to 120 m deep, that happen to be parallel with the dominant wind flow from the south and south-southeast, which governs aeolian processes in the coastal tract. The velocity of winds from …
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Decoupling of iron and phosphate in the global ocean
… of surface nutrient concentrations to changes in aeolian iron supply, I use a hierarchy of ocean circulation and biogeochemistry models. I formulate a mechanistic model of iron cycling which includes scavenging onto sinking particles and complexation with an organic ligand. The iron cycle is …
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