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Geography

Changes in forage fish community indicated by the diet of the Brandt’s cormorant (Phalacrocorax penicillatus) in the central California Current
submitted by pondosbiors 1 hour ago - Topic: Geography
The population, productivity and diet of two Brandt’s cormorant (Phalacrocorax penicillatus) colonies located in the central California Current were compared. The offshore colony on Southeast Farallon Island has experienced a declining population over time and anomalously low productivity in recent years. The nearshore colony near Point Arguello has been increasing and its productivity has re...



Performance of Fast Repetition Rate fluorometry based estimates of primary productivity in coastal waters
submitted by pondosbiors 1 hour ago - Topic: Geography
Capturing the variability of primary productivity in highly dynamic coastal ecosystems remains a major challenge to marine scientists. To test the suitability of Fast Repetition Rate fluorometry (FRRf) for rapid assessment of primary productivity in estuarine and coastal locations, we conducted a series of paired analyses estimating 14C carbon fixation and primary productivity from electron tra...

TOC and satellite-sensed chlorophyll and primary production at the Arctic Front in the Nordic Seas
submitted by pondosbiors 1 hour ago - Topic: Geography
In the Arctic Front region south of Jan Mayen, vertical profiles of Total Organic Carbon (TOC) and hydrographic variables were measured during 3weeks in June 2007. From time series of satellite-sensed chlorophyll, it was determined that the field studies took place in the aftermath of the culmination of the spring bloom, both on the Arctic (Icelandic Sea) and Atlantic (Norwegian Sea) sides of t...

Deep-sourced gas seepage and methane-derived carbonates in the Northern Adriatic Sea
submitted by eyoda86 1 hour ago - Topic: Geography
In the Northern Adriatic sea the occurrence of gas seepage and of unique rock outcrops has been widely documented. The genesis of these deposits has recently been ascribed to gas venting, leading to their classification as methane-derived carbonates. However the origin of seeping gas was not clearly constrained. Geophysical data collected in 2009 reveal that the gas-enriched fluid vents are dee...

The effect of lateral tectonic tilting on fluviodeltaic surficial and stratal asymmetries: Experiment and theory
submitted by eyoda86 1 hour ago - Topic: Geography
Tectonic influence on deltas has long been recognized for its importance in morphodynamic and stratigraphic development. Here we explore the control of lateral tectonic tilting on a prograding fluviodeltaic system through six laboratory experiments with a range of tilting rates. Basement tilting was applied along an axis that bisects the center of the experimental delta, which forced uplift on ...



Shear-wave resonances in a fluid–solid–solid layered structure
submitted by prencib5mi 3 hours ago - Topic: Geography
An inhomogeneous solid layer is bounded on one side by a fluid half-space and on the other by a homogeneous solid half-space. An acoustic wave in the fluid is incident on the layer. Experiments suggest that some kind of shear-wave resonance of the layer exists. Here, the layer is modelled with exponential variations of the material properties (Epstein model). Solutions in terms of hypergeometri...

China-Taiwan Relations Through the Lens of the Interaction Between China’s Association for Relations Across the Taiwan Straits and Taiwan’s Straits Exchange Foundation
submitted by lesdo 4 hours ago - Topic: Geography
China-Taiwan Relations have become significantly less confrontational since 2008. One of the indicators demonstrating the improvement of their relations is the resumption of the contact between China’s Association for Relations Across the Taiwan Straits (ARATS) and Taiwan’s Straits Exchange Foundation (SEF) in 2008 after 9 years of no formal interaction. The purpose of this paper is to exp...


Floodplain biogeochemical mosaics: A multi-dimensional view of alluvial soils
submitted by shohen76 4 hours ago - Topic: Geography
The alluvial floodplains of large rivers are exceptionally productive and dynamic ecosystems, characterized by a complex mosaic of vegetation at different successional stages overlying soils sorted by historic floods. Natural floodplains are widely credited with efficiently removing nitrogen from surface waters and accumulating carbon in biomass, yet very little floodplain research has examined...

Quantifying fire-wide carbon emissions in interior Alaska using field measurements and Landsat imagery
submitted by shohen76 4 hours ago - Topic: Geography
Carbon emissions from boreal forest fires are projected to increase with continued warming and constitute a potentially significant positive feedback to climate change. The highest consistent combustion levels are reported in interior Alaska, and can be highly variable depending on the consumption of soil organic matter. Here we present an approach for quantifying emissions within a fire perime...


The recording of floods and earthquakes in Lake Chichój, Guatemala during the twentieth century
submitted by ogradivca 4 hours ago - Topic: Geography
Laguna Chichój (Lake Chichój) is the only deep permanent lake in the central highlands of Guatemala. The lake is located in the boundary zone between the North American and Caribbean plates. The lake has been struck by devastating earthquakes and tropical cyclones in historical times. We investigated the imprint of twentieth century extreme events on the sedimentary record of this tropical la...

Evidence for production and lateral transport of dissolved organic phosphorus in the eastern subtropical North Atlantic
submitted by jspinci 6 hours ago - Topic: Geography
The concentration of phosphate and dissolved organic phosphorus (DOP) is chronically low and limits phytoplankton growth in the subtropical North Atlantic relative to other ocean basins. Transport of phosphate and DOP from the productive flanks of the gyre to its interior has been hypothesized as an important phosphorus supply pathway. During a cruise in the eastern Atlantic in spring 2011, the...


Northwest Africa 5738: Multistage fluid-driven secondary alteration in an extraordinarily evolved eucrite
submitted by ebm6riol 8 hours ago - Topic: Geography
The Northwest Africa 5738 eucrite contains a record of unprecedented geochemical complexity for a sample from the HED asteroid. It originated with a uniquely evolved (Stannern Trend) primary igneous composition, combining ultra-high bulk incompatible element and Na2O concentrations with a relatively low mg. Its bulk oxygen-isotopic composition (Δ′17O=−0.27‰), as well as its trace element...

A rational approach to seepage flow effects on bottom friction beneath random waves
submitted by swopnelorvi 11 hours ago - Topic: Geography
The bottom friction beneath random waves is predicted taking into account the effect of seepage flow. This is achieved by using wave friction factors for rough turbulent, smooth turbulent and laminar flow valid for regular waves together with a modified Shields parameter which includes the effect of seepage flow. Examples using data typical to field conditions are included to illustrate the app...

A Rankine source computation for three dimensional wave–body interactions adopting a nonlinear body boundary condition
submitted by swopnelorvi 11 hours ago - Topic: Geography
A three-dimensional wave–body interaction problem is numerically simulated by a Rankine source scheme in combination with a mixed Euler–Lagrange method. Singular free surface source points are placed exterior to the free surface, which is known as a desingularized method, and free surface boundary conditions are satisfied along control points on the computational domain. a new source distri...

New correlation for prediction of air entrainment into an Infrared Suppression (IRS) device
submitted by swopnelorvi 11 hours ago - Topic: Geography
In the present research, the conservation equations for mass, momentum, energy as well as the equations for k and ɛ have been solved numerically to compute the rate of air entrained into an Infrared Suppression (IRS) device using finite volume method. Hence, four different correlations (Eqs. (15)–(18)) have been developed to predict the mass suction over a wide range of operating parameters ...