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Sunday, August 9, 2020 | History

2 edition of Accelerated settling of marine particulate matter by marine snow aggregates found in the catalog.

Accelerated settling of marine particulate matter by marine snow aggregates

Vernon L. Asper

Accelerated settling of marine particulate matter by marine snow aggregates

by Vernon L. Asper

  • 186 Want to read
  • 2 Currently reading

Published by Woods Hole Oceanographic Institution in Woods Hole, Mass .
Written in English

    Subjects:
  • Marine sediments.,
  • Suspended sediments.

  • Edition Notes

    Statementby Vernon L. Asper.
    SeriesWHOI / Woods Hole Oceanographic Institution -- 86-12., WHOI (Series) -- 86-12., Doctoral dissertation (Woods Hole Oceanographic Institution)
    The Physical Object
    Paginationxiii, 189 p. :
    Number of Pages189
    ID Numbers
    Open LibraryOL16117856M

    By Lars Håkanson This is a newly published work, copyright The aim of this book is to give a state-of-the-art presentation of suspended particulate matter (SPM) in lakes, rivers and marine areas, with a focus on the roles that SPM plays in aquatic ecosystems and on modelling. plankton fecal pellets or phytoplankton aggregates, but instead focus on the relatively simple, yet efficient parameterisations commonly applied in large-scale marine biogeo-chemical models. In doing so, we consider sinking organic matter to be a mixture of (unspecified) particles with certain characteristics. In particular, we contrast two

    Particulate matter (PM) Particulate matter (PM), or airborne particles, include dust, dirt, soot, and smoke. Some particles are directly emitted into the air by, for example, cars, trucks, buses factories, construction sites, and wood burning. Other particles are formed in the air when gases from burning fuels react with sunlight and water vapor.   The duration of use is usually significantly longer for marine vessels than for roadside vehicles. Therefore, these vessels are often powered by relatively old engines which may propagate air pollution. Also, the quality of fuel used for marine vessels is usually not comparable to the quality of fuels used in the automotive sector and therefore, port areas may exhibit a high degree of air Cited by:

    The revised NOx Technical Code includes a new chapter based on the agreed approach for regulation of existing (pre) engines established in MARPOL Annex VI, provisions for a direct measurement and monitoring method, a certification procedure for existing engines, and test cycles to be applied to Tier II and Tier III engines.   ambient particulate matter (PM) concentrations in the area. This report addresses potential exposures and risks to a variety of non-tribal individuals who may spend time at or near the portion of the UCR site designated as the Lake Roosevelt National Recreation Area (LRNRA) – nearby residents, park employees, and park visitors.


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Accelerated settling of marine particulate matter by marine snow aggregates by Vernon L. Asper Download PDF EPUB FB2

ALLDREDGE A. and M. YOUNG~LUTH () The significance of macroscopic aggregates (marine snow) as sites of heterotrophic bacterial production in the mesopelagic zone at the subtropical Atlantic.

Deep- Sea Research, 32, ASPER V. () Accelerated settling of particulate matter by 'marine snow" by: In situ settling speeds of marine snow aggregates were determined with the Marine Aggregate Settling Collector and Observation Tower (MASCOT) in the central Black Sea and in the northern Gulf of Mexico.

The Black Sea data showed a wide distribution in size and settling speeds of marine snow aggregates (05–55 mm diameter and 13– m/d) with an average settling speed of 117 m/d over Cited by: Marine particulate organic matter (POM) is an important component of the coastal nutrient pool that includes bacteria, phytoplankton, zooplankton, and detrital matter (Volkman and Tanoue ).

Marine snow aggregates are often a dominant component of carbon flux and are sites of high bacterial activity; thus, small-scale changes in the settling behavior of marine snow can affect the. Delayed settling of marine snow: Effects of density gradient and particle properties and implications for carbon cycling Jennifer C.

Prairiea,b,⁎, Kai Ziervogela, Roberto Camassab, Richard M. McLaughlinb, Brian L. Whitea, Carolin Dewaldc, Carol Arnostia a Department of Marine Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NCUSA.

The aim of this book is to give a state-of-the-art presentation of suspended particulate matter (SPM) in lakes, rivers and marine areas, with a focus on the roles that SPM plays in Cited by: Accelerated settling of marine particulate matter by "marine snow" aggregates / by Vernon L.

Asper. Woods Hole, Mass.: Woods Hole Oceanographic Institution, [] W2 no Asper V () Accelerated settling of particulate matter by “marine snow” aggregates. Ph.D. Thesis, WHOI/MIT joint educational program, pp.

Google Scholar Asper VL () Measuring the flux and sinking speed of marine snow by: Abstract. Most of the organic matter sequestered in Recent and ancient marine sediments is ultimately derived from organic matter biosynthesized by marine organisms inhabiting the surface waters of the oceans and transported to the seafloor as particulate organic matter (POM).Cited by: sinking velocities, size distributions, fluxes, and microbial degradation rates By Andrew M.

McDonnell observations to study the dynamics of marine particulate matter at the contrasting sites of the consisted primarily of small heterogeneous marine snow aggregates, sank more slowly than the.

Leblanc, K. et al. Particulate biogenic silica and carbon production rates and particulate matter distribution in the Indian sector of the Subantarctic Ocean.

Deep-Sea Res. II 49, – Cited by: The formation of large marine snow macroflocs and stringers was monitored at a fixed station in the southern North Sea. During an month investigation, large marine snow floes occurred in the water column on nine occasions for periods lasting between 5 and 16 d.

Their formation coincided with both high phytoplankton biomass and low by: Reduction of SO2, NOx and Particulate Matter from Ships with Diesel Engines 5 1BIntroduction The focus on the environmental impact from global shipping and exhaust gas emissions from marine engines is increasing every year.

Different technologies on marine engines are coming up in order to reduce emissions, i.e. NO x, SO xFile Size: 7MB. Evaluating Atmospheric Deposition of Particulate Matter in the Lake Tahoe Basin Final Report Decem L.-W. Antony Chen1,2 Anna Ya-Chun Tai1 Xiaoliang Wang1 Heather Holms3 Judith C.

Chow2 John G. Watson2 1Division of Atmospheric Sciences Desert Research Institute. Ships generate emissions of sulfur oxides (SOx), oxides of nitrogen(NOx), particulate matter (PM) and carbon dioxide (CO2) as a result of the fuel used to power them.

Ship generated emissions can be significant in areas subject to heavy marine traffic so many actions have been undertaken in recent years to significantly reduce air emissions.

Settling particulate matter (SPM) and bottom sediments were collected at two marinas in Thea Foss Waterway, Commencement Bay, Tacoma, Washington, between September and February The samples were analyzed for metals (copper, lead, mercury, zinc), semivolatile organics, and butyltins.

These data were needed to refine contaminant flux. aggregates to suspension-size and the fractions of PM10 and PM generated by the breakage process for a range of soils. Soil samples were collected from nine states (Arizona, California, Nevada, Colorado, Kansas, Nebraska, New Mexico, PM are defined as particulate matter less than 10 µm and µm in aerodynamic diameter, respectively.

marine diesels), boilers, incinerators and gas combustion units (GCU’s) Emsys has also been approved by the US EPA for offshore drilling permits in the US Gulf of Mexico on drillships and semi-submersibles Key Features IP56 stainless steel enclosure (L) is certified for installations on the weather Size: 1MB.

particulate form) and precursors of secondary particulate matter (which is generated from chemical transformations in the atmosphere of gaseous precursor species such as ammonia, nitrogen oxides, sulfur oxides, and volatile organic compounds). Primary and secondary particulate matter contribute to regional haze in the CENRAP region.

Diesel particulate matter resulting from the incomplete combustion of diesel fuel produces soot (black carbon) particles. These particles include tiny nanoparticles—smaller than a one micrometre (one micron).

Soot and other particles from diesel engines worsen the particulate matter pollution in the air and are harmful to health. Technical Data and Reports on Particulate Matter (PM) Measurements and SIP Status EPA collects data from the states and regions on their air quality and state implementation plan (SIP) progress.

This information is compiled in a database, and used to create reports, trend charts, and maps. Epidemiological studies provide compelling evidence that pollution by airborne particulate matter (PM) derived from fossil fuel combustion is an important cause of morbidity and premature death [1, 2].

Chronic PM exposure can induce short-term (e.g., cardiovascular diseases or asthma) and long-term health effects, most notably by: Particulate Matter (PM) Particulate Matter (PM) are very small particles, that are – depending on their size – classified as PM10, PM or PM These are Particles with a diameter of less than 10 µm, respectively µm, the smallest group with a size under µm is also called Ultra Fine Particles (UFP).File Size: KB.