نتایج جستجو برای: anthropogenic factor

تعداد نتایج: 867506  

2013
DAVID E. RUPP PHILIP W. MOTE NATHANIEL L. BINDOFF PETER A. STOTT DAVID A. ROBINSON

Significant declines in spring Northern Hemisphere (NH) snow cover extent (SCE) have been observed over the last five decades. As one step toward understanding the causes of this decline, an optimal fingerprinting technique is used to look for consistency in the temporal pattern of spring NH SCE between observations and simulations from 15 global climate models (GCMs) that form part of phase 5 ...

2017
Yang Yang Lynn M Russell Sijia Lou Hong Liao Jianping Guo Ying Liu Balwinder Singh Steven J Ghan

Eastern China has experienced severe and persistent winter haze episodes in recent years due to intensification of aerosol pollution. In addition to anthropogenic emissions, the winter aerosol pollution over eastern China is associated with unusual meteorological conditions, including weaker wind speeds. Here we show, based on model simulations, that during years with decreased wind speed, larg...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2007
John A Pyle Nicola Warwick Xin Yang Paul J Young Guang Zeng

The oxidizing capacity of the atmosphere is affected by anthropogenic emissions and is projected to change in the future. Model calculations indicate that the change in surface ozone at some locations could be large and have significant implications for human health. The calculations depend on the precise scenarios used for the anthropogenic emissions and on the details of the feedback processe...

2007
Jeffrey T. Kiehl

[1] Climate forcing and climate sensitivity are two key factors in understanding Earth’s climate. There is considerable interest in decreasing our uncertainty in climate sensitivity. This study explores the role of these two factors in climate simulations of the 20th century. It is found that the total anthropogenic forcing for a wide range of climate models differs by a factor of two and that ...

Journal: :Environmental geochemistry and health 2014
N Cukrov S Frančišković-Bilinski D Bogner

This study presents metal levels in the sediments of the Bakar Bay, with its main goal to evaluate recent anthropogenic influence, as well as over previous decades. Sediment profiles at 7 sampling points were taken. Chemical contents in bulk sediment were obtained using ICP, ICP-MS, and AAS methodologies, and 20 most significant elements were presented. Concentrations of selected elements were ...

ژورنال: علوم آب و خاک 2020

Dusts contain heavy metals such as Pb, Zn, Cu, Cr, Cd and As that can threat humanchr('39')s health and environment. Therefore, the spatial distribution of heavy metals concentration and soil pollution monitoring and environmental quality protection seem to be essential. To assess heavy metals pollution level in Ahvaz street dust, 115 street dust samples were collected from main pedestrians. Th...

Altogether 20 groundwater samples were collected around the Lakan Pb and Zn mine in Iran. Samples were analyzed for 8 constituents including Fe, Pb, Hg, Mn, Zn, CN, SO4 and Cl using standard method. The results show that the average concentrations of constituents were 0.01, 0.60, 0.10, 0.01, 0.40, 35, 0.01 and 5.95 mg/kg for Fe, Mn, Pb, Zn, Hg, SO4, CN and Cl, respectively. The computed contami...

2015
Chelsea M. Rochman Akbar Tahir Susan L. Williams Dolores V. Baxa Rosalyn Lam Jeffrey T. Miller Foo-Ching Teh Shinta Werorilangi Swee J. Teh

The ubiquity of anthropogenic debris in hundreds of species of wildlife and the toxicity of chemicals associated with it has begun to raise concerns regarding the presence of anthropogenic debris in seafood. We assessed the presence of anthropogenic debris in fishes and shellfish on sale for human consumption. We sampled from markets in Makassar, Indonesia, and from California, USA. All fish an...

Journal: :journal of mining and environment 0
r. dabiri department of geology, mashhad branch, islamic azad university, mashhad, iran m. bakhshi mazdeh department of geology, mashhad branch, islamic azad university, mashhad, iran h. mollai department of geology, mashhad branch, islamic azad university, mashhad, iran

the aim of this study was to determine the extent of metal pollutions and the identification of their major sources in the vicinity of the sangan iron mine occurring in ne iran. soil samples were collected from the vicinity of the mine site and analyzed for heavy metals. in addition, the chemical speciation of these metals was investigated by means of the sequential extraction procedure. the st...

2012
Jinwon Kim Yu Gu Kuo-Nan Liou Rokjin J. Park Chang-Keun Song

The direct and semi-direct radiative effects of anthropogenic aerosols on the radiative transfer and cloud fields in the Western United States (WUS) according to seasonal aerosol optical depth (AOD) and regional climate are examined using a regional climate model (RCM) in conjunction with the aerosol fields from a GEOS-Chem chemicaltransport model (CTM) simulation. The two radiative effects can...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید