نتایج جستجو برای: anthropogenic causes

تعداد نتایج: 275384  

Journal: :محیط شناسی 0
رضا حسن زاده کارشناس ارشد زمین شناسی زیست محیطی. دانشگاه شهید باهنر کرمان.–مرکز بین المللی علوم، تکنولوژی پیشرفته و علوم محیطی احمد عباس نژاد استادیار بخش زمین شناسی دانشگاه شهید باهنر کرمان محمد علی حمزه کارشناس ارشد زمین شناسی زیست محیطی، کارشناس مؤسسه ملی اقیانوس شناسی

in this article, groundwater samples in urban areas of kerman studied to assess the degree of pollution by heavy metals and major ions and other water quality parameters as a consequence of geology and anthropogenic sources. 43 samples were collected and analyzed by graphite furnace atomic absorption spectrometry, titration and potentiometery for some heavy metals (cd, cr, cu, mn, pb and zn), m...

Journal: :Danish medical journal 2012
Charlotte Ulrikka Rask

Medically unexplained or functional somatic symptoms (FSS) in children constitute a major clinical problem. However, research data on FSS in young children are few, and epidemiological studies are hampered by lack of good standardised measures. The present thesis consists of two studies: In study one, we developed two measures to assess FSS in young children. The first measure is a parent i...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2016
John T Abatzoglou A Park Williams

Increased forest fire activity across the western continental United States (US) in recent decades has likely been enabled by a number of factors, including the legacy of fire suppression and human settlement, natural climate variability, and human-caused climate change. We use modeled climate projections to estimate the contribution of anthropogenic climate change to observed increases in eigh...

2010
T. Gorgues O. Aumont K. B. Rodgers

A three-dimensional circulation model that includes a representation of anthropogenic carbon as a passive tracer is forced with climatological buoyancy and momentum fluxes. This simulation is then used to compute offline the anthropogenic 1pCO2 (defined as the difference between the atmospheric CO2 and its seawater partial pressure) trends over three decades between the years 1970 and 2000. It ...

Journal: :Waste management 2015
Sandra R Mueller Patrick A Wäger Rolf Widmer Ian D Williams

The mining of material resources requires knowledge about geogenic and anthropogenic deposits, in particular on the location of the deposits with the comparatively highest concentration of raw materials. In this study, we develop a framework that allows the establishment of analogies between geological and anthropogenic processes. These analogies were applied to three selected products containi...

2007
Arne Biastoch Christoph Völker Claus W. Böning

[1] An eddy-permitting circulation model of the Atlantic Ocean was used to study the effect of mesoscale processes on the uptake and spreading of anthropogenic CO2 and CFC-11. A comparison with a coarser-resolution model version shows anthropogenic tracer distributions with qualitatively similar patterns, but much more structure (e.g., stronger longitudinal gradients) in the eddy-permitting mod...

Journal: :Molecular ecology 2010
Kathleen C Parker Dorset W Trapnell J L Hamrick Wendy C Hodgson Albert J Parker

Several Agave species have played an important ethnobotanical role since prehistory in Mesoamerica and semiarid areas to the north, including central Arizona. We examined genetic variation in relict Agave parryi populations northeast of the Mogollon Rim in Arizona, remnants from anthropogenic manipulation over 600 years ago. We used both allozymes and microsatellites to compare genetic variabil...

2016
W. F. Ruddiman D. Q. Fuller J. E. Kutzbach P. C. Tzedakis J. O. Kaplan E. C. Ellis S. J. Vavrus C. N. Roberts R. Fyfe F. He C. Lemmen J. Woodbridge

For more than a decade, scientists have argued about the warmth of the current interglaciation. Was the warmth of the preindustrial late Holocene natural in origin, the result of orbital changes that had not yet driven the system into a new glacial state? Or was it in considerable degree the result of humans intervening in the climate system through greenhouse gas emissions from early agricultu...

2006
S. E. Mikaloff Fletcher N. Gruber A. R. Jacobson S. C. Doney S. Dutkiewicz M. Gerber M. Follows F. Joos K. Lindsay D. Menemenlis A. Mouchet S. A. Müller J. L. Sarmiento

[1] Regional air-sea fluxes of anthropogenic CO2 are estimated using a Green’s function inversion method that combines data-based estimates of anthropogenic CO2 in the ocean with information about ocean transport and mixing from a suite of Ocean General Circulation Models (OGCMs). In order to quantify the uncertainty associated with the estimated fluxes owing to modeled transport and errors in ...

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