نتایج جستجو برای: organic carbon oc storage

تعداد نتایج: 629858  

2017
Adelaide Dinoi Daniela Cesari Angela Marinoni Paolo Bonasoni Angelo Riccio Elena Chianese Giuseppina Tirimberio Attilio Naccarato Francesca Sprovieri Virginia Andreoli Sacha Moretti Daniel Gullì Claudia R. Calidonna Ivano Ammoscato Daniele Contini

A field campaign was performed simultaneously at five measurement sites, having different characteristics, to characterize the spatial distribution of the carbonaceous content in atmospheric aerosol in Southern Italy during the winter season. Organic carbon (OC) and elemental carbon (EC) were measured at urban (Naples), suburban (Lecce), coastal/marine (Lamezia Terme and Capo Granitola), and re...

2012
X. Y. Zhang Y. Q. Wang T. Niu X. C. Zhang S. L. Gong Y. M. Zhang J. Y. Sun

From 2006 to 2007, the daily concentrations of major inorganic water-soluble constituents, mineral aerosol, organic carbon (OC) and elemental carbon (EC) in ambient PM10 samples were investigated from 16 urban, rural and remote sites in various regions of China, and were compared with global aerosol measurements. A large difference between urban and rural chemical species was found, normally wi...

2013
Marianthi-Anna Kioumourtzoglou Antonella Zanobetti Joel D Schwartz Brent A Coull Francesca Dominici Helen H Suh

BACKGROUND Fine particle (PM2.5) pollution related to combustion sources has been linked to a variety of adverse health outcomes. Although poorly understood, it is possible that organic carbon (OC) species, particularly those from combustion-related sources, may be partially responsible for the observed toxicity of PM2.5. The toxicity of the OC species may be related to their chemical structure...

ژورنال: علوم آب و خاک 2010
هاشمی بنی, امه‌کلثوم , بیگی هرچگانی, حبیب اله , صالحی, محمدحسن ,

Although soil organic matter (SOM) constitutes a small portion of soil bulk weight, it has a tremendous effect on physico-chemical and biological properties of soils. It is also one of the most important indicators of soil quality and its production. Soil organic matter determination is required for soil fertility management and soil pollution purposes. Wet oxidation procedure of Walkley-Black ...

2010
S. Agarwal S. G. Aggarwal K. Okuzawa K. Kawamura

To better understand the size-segregated chemical composition of aged organic aerosols in the western North Pacific rim, dayand night-time aerosol samples were collected in Sapporo, Japan during summer 2005 using an Andersen impactor sampler with 5 size bins: Dp <1.1, 1.1–2.0, 2.0–3.3, 3.3–7.0, >7.0 μm. Samples were analyzed for the molecular composition of dicarboxylic acids, ketoacids, αdicar...

2009
Ralph J. Delfino Norbert Staimer Thomas Tjoa Daniel L. Gillen Andrea Polidori Mohammad Arhami Micheal T. Kleinman Nosratola D. Vaziri John Longhurst Constantinos Sioutas

BACKGROUND Mechanisms involving oxidative stress and inflammation have been proposed to explain associations of ambient air pollution with cardiovascular morbidity and mortality. Experimental evidence suggests that organic components and ultrafine particles (UFP) are important. METHODS We conducted a panel study of 60 elderly subjects with coronary artery disease living in retirement communit...

2017
Krzysztof Klejnowski Marianna Czaplicka

In this study, the ambient aerosol (PM10) concentrations of elemental carbon (EC), organic carbon (OC), total carbon (TC), and levoglucosan are reported for a Polish health resort following a one-year (March 2016–April 2017) sampling campaign. The seasonal variation of OC, EC, and levoglucosan (LG) concentrations showed their maximum during the heating season for this site, with monthly mean to...

2013
Yuguo Liu Changcheng Liu Shijie Wang Ke Guo Jun Yang Xinshi Zhang Guoqing Li

Karst ecosystems are important landscape types that cover about 12% of the world's land area. The role of karst ecosystems in the global carbon cycle remains unclear, due to the lack of an appropriate method for determining the thickness of the solum, a representative sampling of the soil and data of organic carbon stocks at the ecosystem level. The karst region in southwestern China is the lar...

2002
Rokjin J. Park Daniel J. Jacob Mian Chin Randall V. Martin

We use a global 3-D model simulation of elemental carbon (EC) and organic carbon (OC) aerosols to interpret year-round observations for 1998 at a network of 45 U.S. sites (IMPROVE) and from there to better quantify the natural and anthropogenic U.S. sources of these aerosols. Our resulting best estimate of 1998 sources in the contiguous United States are 0.60 Tg yr EC and 0.52 Tg yr OC from fos...

2008
S. Leigh Paul A. del Giorgio

Using a novel method to measure the isotopic signature (d13C) of respiratory CO2 produced by bacterioplankton, we determined the proportion of terrigenous vs. algal-derived organic carbon (OC) respired by bacteria in a series of eight lakes in southern Québec (Canada). The lakes are located within the same general basin but span a large range in trophic status, morphometry, and dissolved OC (DO...

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