Terrestrial Influences on Aerosol Composition Over the Western North Atlantic Ocean PDF Download

Author: Michael Darzi
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 118

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Author: Nicole Chisholm
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Marine aerosols play an important role in earth's climate, but their effects remain highly uncertain due to a poor understanding of their sources, properties, and atmospheric processing, partly due to limited measurements. The Coastal-Fog (C-FOG) study investigated the processes controlling the formation and properties of fog in the North Atlantic Ocean. As part of this study, aerosol particle size distributions and chemical composition were measured off the shore of the northeastern United States and Atlantic Canada, and used to investigate the sources and processes affecting the observed aerosols. Processed marine air during the study was characterized by single and bi-modal aerosol size distributions. Aerosols in the port city of St. John's, Newfoundland reflected local emissions built up due to poor ventilation, whereas aerosols in Halifax, Nova Scotia were lower in concentration because the harbour is more spread out. Finally, two particle growth events were observed. The first event captured the appearance of 10 nm particles that grew to 30 nm over 4 h. These aerosols appeared to be newly formed in the upper portion of the boundary layer with influence from the free troposphere before subsiding to the surface. In the second event, 45 nm particles grew to 70 nm over 8 h. The growth of these aerosols was most likely due to the direct condensation of organic vapours emitted from boreal forests and/or the ocean. Our observations provide important insight into the processes affecting marine aerosols and highlight the crucial role of boundary layer meteorology.

Author: Hansina Rae Hill
Publisher:
ISBN:
Category : Atmospheric aerosols
Languages : en
Pages : 75

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Atmospheric particulate matter has a substantial impact on global climate due to its ability to absorb/scatter solar radiation and act as cloud condensation nuclei (CCN). Yet, little is known about marine aerosol, in particular, the carbonaceous fraction. In the present work, particulate matter was collected, using High Volume (HiVol) samplers, onto quartz fiber substrates during a series of research cruises on the Atlantic Ocean. Samples were collected on board the R/V Endeavor on West and East (March-April, 2006) and East and West (June-July, 2006) transects in the North Atlantic, as well as on the R/V Polarstern during a North and South (October-November, 2005) transect along the western coast of Europe and Africa. The aerosol total carbon (TC) concentrations for the West & ndash;East (Narragansett, RI, USA to Nice, France) and East & ndash;West (Heraklion, Crete, Greece to Narragansett, RI, USA) transects were generally low over the open ocean (0.36±0.14 & mu;g C/m3) and increased as the ship approached coastal areas (2.18±1.37 & mu;g C/m3), due to increased terrestrial/anthropogenic aerosol inputs. The TC for the North & ndash;South transect samples decreased in the southern hemisphere with the exception of samples collected near the 15th parallel where calculations indicate the air mass back trajectories originated from the continent. Seasonal variation in organic carbon (OC) was seen in the northern hemisphere open ocean samples with average values of 0.45 & mu;g/m3 and 0.26 & mu;g/m3 for spring and summer, respectively. These low summer time values are consistent with SeaWiFS satellite images that show decreasing chlorophyll a concentration (a proxy for phytoplankton biomass) in the summer. There is also a statistically significant (p

Author:
Publisher: Elsevier
ISBN: 0080874673
Category : Technology & Engineering
Languages : en
Pages : 457

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Book Description
Atmospheric Pollution 1980

Author: S Ramachandran
Publisher: CRC Press
ISBN: 1351648454
Category : Science
Languages : en
Pages : 451

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This book includes basic knowledge and understanding on the characteristics of aerosols over the continent and oceanic regions, their composition, residence times, sinks and size distributions, and their effects in the radiative transfer and climate of Earth.

Author: Thomas Lincoln Casey
Publisher:
ISBN:
Category : MSH (Hormone)
Languages : en
Pages : 636

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Book Description
Records of meetings 1808-1916 in v. 11-27.

Author: Peter S. Liss
Publisher: Springer
ISBN: 3642256430
Category : Science
Languages : en
Pages : 315

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Book Description
The oceans and atmosphere interact through various processes, including the transfer of momentum, heat, gases and particles. In this book leading international experts come together to provide a state-of-the-art account of these exchanges and their role in the Earth-system, with particular focus on gases and particles. Chapters in the book cover: i) the ocean-atmosphere exchange of short-lived trace gases; ii) mechanisms and models of interfacial exchange (including transfer velocity parameterisations); iii) ocean-atmosphere exchange of the greenhouse gases carbon dioxide, methane and nitrous oxide; iv) ocean atmosphere exchange of particles and v) current and future data collection and synthesis efforts. The scope of the book extends to the biogeochemical responses to emitted / deposited material and interactions and feedbacks in the wider Earth-system context. This work constitutes a highly detailed synthesis and reference; of interest to higher-level university students (Masters, PhD) and researchers in ocean-atmosphere interactions and related fields (Earth-system science, marine / atmospheric biogeochemistry / climate). Production of this book was supported and funded by the EU COST Action 735 and coordinated by the International SOLAS (Surface Ocean- Lower Atmosphere Study) project office.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 3

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Paper, technical report and book titles include: (1) Aerosol size distributions in the cloudy atmospheric boundary layer of the North Atlantic Ocean; (2) Light scattering and cloud condensation nucleus activity of sulfate aerosol measured over the northeast atlantic ocean; (3) The structure of frontal weather systems in western europe; (4) Aerosol-cloud-climate interactions; (5) Recent field studies of sulfur gases, particles and cloud in clean marine air and their significance with respect to the DMS-cloud-climate hypothesis; and (6) Recent field studies of aerosol and cloud processes relevant to climate.

Author: S. G. Jennings
Publisher: University of Arizona Press
ISBN: 9780816513628
Category : Science
Languages : en
Pages : 324

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Book Description
There is now a growing awareness that, in addition to the well publicized influence of carbon dioxide and other greenhouse gases on the warming of the earth's atmosphere, aerosol particles may also play an important role in forcing climate change. This volume brings together previously unavailable data and interpretative analyses, derived from studies in both the U.S. and U.S.S.R., which review, update, and assess aerosol-related climatic effects.

Author: J. E. Penner
Publisher:
ISBN:
Category : Aerosol propellants
Languages : en
Pages : 68

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