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Geography

Rapid formation of large aggregates during the spring bloom of Kerguelen Island: observations and model comparisons
submitted by shohed 1 hour ago - Topic: Geography
While production of aggregates and their subsequent sinking is known to be onepathway for the downward movement of organic matter from the euphotic zone,the rapid transition from non-aggregated to aggregated particles has not beenreported previously. We made one vertical profile of particle sizedistributions (PSD; sizes ranging from 0.052 to several millimeters in equivalentspherical diameter) ...



Nonlinear dynamic model for flapping-type tidal energy harvester
submitted by olsefi 1 hour ago - Topic: Geography
This paper presents a mathematical model to predict the dynamic response of a lab-scale flapping-type tidal energy harvester. In the model, the forces produced by the hydroplane were derived based on a quasi-steady-state assumption, and no approximation was applied to the terms of the force equation. Therefore, the equation of motion becomes nonlinear; it was solved using the Runge–Kutta meth...

GIS-Based Landslide Susceptibility Mapping on the Peloponnese Peninsula, Greece
submitted by jaja 1 hour ago - Topic: Geography
In this paper, bivariate statistical analysis modeling was applied and validated to derive a landslide susceptibility map of Peloponnese (Greece) at a regional scale. For this purpose, landslide-conditioning factors such as elevation, slope, aspect, lithology, land cover, mean annual precipitation (MAP) and peak ground acceleration (PGA), and a landslide inventory were analyzed within a GIS env...

Age and P-T evolution of the Neoproterozoic Turkel Anorthosite Complex, Eastern Ghats Province, India
submitted by iic 1 hour ago - Topic: Geography
Massif-type anorthosite complexes constitute a distinct component of the Proterozoic Eastern Ghats Province in India. They intruded the poly-deformed and poly-metamorphic granulite facies terrane near its western and northern tectonic contacts with the Archaean Bastar and Singhbhum cratons, respectively. Following their emplacement, the complexes were variously affected by high-grade metamorphi...

Petrogenesis of Neoarchean TTG rocks in the Yangtze Craton and its implication for the formation of Archean TTGs
submitted by iic 1 hour ago - Topic: Geography
The Yangtze Craton is one of the most important cratonic blocks in eastern Asia. However, its early evolution has not been well constrained yet, because of the poor exposure of Archean basement rocks. In this contribution, a combined study of zircon U-Pb age, Hf-O isotope compositions, as well as whole rock element compositions was carried out for gray gneiss rocks from the Douling complex in t...



Petrogenesis of Gunbarrel magmatic rocks: Homogeneous continental tholeiites associated with extension and rifting of Neoproterozoic Laurentia
submitted by iic 1 hour ago - Topic: Geography
The ca. 780Ma Gunbarrel Igneous Event of northwest Laurentia consists of spatially discrete suites of sills, dykes and lavas distributed over a vast area extending from Wyoming in the south to the Wopmay Orogen and the Mackenzie Mountains of Northwest Canada. Thick (≤100m) sills and rare dykes in Wopmay orogen and thinner (≤30m) sills, dykes and rare lavas in the Mackenzie Mountains are mod...

Tectonic restoration of the Precambrian crystalline rocks along the west coast of India: Correlation with eastern Madagascar in East Gondwana
submitted by iic 1 hour ago - Topic: Geography
New structural–mineralogical data and U–Th-total Pb monazite chemical ages in 27 samples in a 430km long corridor along the west coast of India are combined with existing data to reconstruct the tectonic set up of the Meso/Neoarchean crystalline rocks in the Western Dharwar Craton (WDC). The data helps to delineate two NW-trending Paleoproterozoic ductile shear zones that limit the southern...


Private motorised urban mobility in China’s large cities: the social causes of change and an agenda for future research
submitted by vitvnhoa2 3 hours ago - Topic: Geography
The growth of private motorised urban mobility has become a key issue in relation to environmental quality in China’s cities. This paper reports on a nationwide study of the changes in car use in the 2000s, conducted in eleven large cities. This may assist us in filling the gaps in our existing knowledge, which is based on individual city cases. It is apparent that China’s large cities are ...

Biogeochemical variations at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) in the northeast Atlantic Ocean, from weekly to inter-annual time scales
submitted by chorlis 3 hours ago - Topic: Geography
We present high-resolution autonomous measurements of carbon dioxide partialpressure p(CO2) taken in situ at the Porcupine Abyssal Plain sustainedobservatory (PAP-SO) in the Northeast Atlantic (49° N,16.5° W; water depth of 4850 m) for the period 2010 to 2012. of p(CO2) made at 30 m depth on a sensor frame arecompared with other autonomous biogeochemical measurements at that depth(including c...


The influence of soils on heterotrophic respiration exerts a strong control on net ecosystem productivity in seasonally dry Amazonian forests
submitted by chorlis 3 hours ago - Topic: Geography
Net ecosystem productivity of carbon (NEP) in seasonally dry forests of the Amazon varies greatly between sites with similar precipitation patterns. Correctly modeling the NEP seasonality with terrestrial ecosystem models has proven difficult. Previous modelling studies have mostly advocated incorporating processes that act to reduce water stress on gross primary productivity (GPP) during the d...

Dissolved greenhouse gases (nitrous oxide and methane) associated with the natural iron-fertilized Kerguelen region (KEOPS 2 cruise) in the Southern Ocean
submitted by chorlis 3 hours ago - Topic: Geography
The concentrations of greenhouse gases (GHGs) like nitrous oxide (N2O) and methane (CH4) were measured in the Kerguelen Plateau Region (KPR), an area with annual microalgal bloom caused by natural Fe fertilization, which may stimulate microbes involved in GHG cycling. This study was carried out during the KEOPS 2 cruise during the austral spring of 201Two transects were sampled along and across...


Modelling landscape-scale erosion potential related to vehicle disturbances along the u.s.-mexico border
submitted by mnasawetz 3 hours ago - Topic: Geography
Decades of intensive off-road vehicle use for border security, immigration, smuggling, recreation, and military training along the United States-Mexico border has prompted concerns about long-term human impacts on sensitive desert ecosystems. To help managers identify areas susceptible to soil erosion from anthropogenic activities, we developed a series of erosion potential models based on fact...

Simulations of nonlinear harmonic generation by an internal wave beam incident on a pycnocline
submitted by mpeipir 4 hours ago - Topic: Geography
Internal wave beams generated by oceanic tidal flows propagate upward andinteract with the increasing stratification found at the pycnocline. Thenonlinear generation of harmonic modes by internal wave beams incident on apycnocline has recently been demonstrated by laboratory experiments andnumerical simulations. In these previous studies, the harmonic modes weretrapped within the pycnocline bec...

Impact of flow velocity on biochemical processes – a laboratory experiment
submitted by osebliy 4 hours ago - Topic: Geography
Understanding and predicting hydraulic and chemical properties of natural environments are current crucial challenges. It requires considering hydraulic, chemical and biological processes and evaluating how hydrodynamic properties impact on biochemical reactions. In this context, an original laboratory experiment to study the impact of flow velocity on biochemical reactions along a one-dimensio...

Reducing the basin vulnerability by land management practices under past and future climate: a case study of the Nam Ou River Basin, Lao PDR
submitted by osebliy 4 hours ago - Topic: Geography
This research evaluates different land management practices for the Nam Ou River Basin in Northern Laos for reducing vulnerability of the basin due to erosion and sediment yield under existing and future climate conditions. We use climate projection data (precipitation and temperature) from three general circulation models (GCMs) for three greenhouse gas emission scenarios (GHGES), namely B1, A...