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Showing 1 to 20 of 29 for “"Marine Boundary Layer"”.
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Modelling the marine boundary layer for offshore wind power utilisation
… is concerned with modelling the structure of the marine atmospheric boundary layer, with focus on effects, which are important for wind resource assessment. Data from the offshore measurement program Rodsand in the Danish Baltic Sea have been used for the analysis. The core of the work is the …
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A revised conceptual model of the tropical marine boundary layer
… returns, a re-conceptualization of the tropical marine boundary layer based on this new radar product, and supplemental analysis of other data from this environment. The running theme throughout is moisture variability—its presence, how it can be better detected, and how it should be portrayed in …
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Secondary organic aerosol formation of relevance to the marine boundary layer
… five model compounds when oxidized by Cl in the marine boundary layer could be a significant source of SOA in the early morning.</p><p>In addition, the mechanistic reaction pathways for Cl oxidation of alpha-pinene, beta-pinene, d-limonene, and toluene with Cl have been developed within the …
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A numerical model study of the stratocumulus-topped marine boundary layer
… to investigate processes in the cloud-topped marine atmospheric boundary layer. Model developments were required to correctly apply surface flux terms near the sea surface, poor representation of which is common to several models from the recent literature. The improved surface forcing is …
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A study of the velocity structure in a marine boundary layer : instrumentation and observations
… of a unique flow measuring instrument for bottom boundary layer studies in the marine environment is documented. The effectiveness of the instrument in acquiring data with which models of near bottom flows in the ocean can be tested is demonstrated by the results of a field experiment in Vineyard …
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Tides, Winds, and Reactive Halogens A Study of Multiphase Chemistry in the Marine Boundary Layer
… components are observed at the Tudor Hill Marine Atmospheric Observatory (THMAO) located in Bermuda as part of the Bermuda boundary Layer Experiment on the Atmospheric Chemistry of Halogens (BLEACH) campaign, including Br2, BrCl, BrO, HOBr, and for the first time to our knowledge, BrONO2. …
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A Modelling study of the atmospheric role of iodine in the Coastal Marine Boundary Layer
… measurements were obtained from the coastal marine environment of Mace Head, Ireland in Summer 2007. The modelled results have shown that in such an environment, the presence of iodine species has a significant impact upon the oxidising capacity of the troposphere, especially in the first …
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Aerosol spatial variability in the vicinity of marine boundary layer clouds observed by satellite-based lidar
Open Restriction set for Item 115394 on 2020-07-28T15:50:25Z with date null by lac7@illinois.edu.
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The relative contribution of free radicals to the oxidation chain of Dimethylsulphide in the marine boundary layer
… Senke von Dimethylsulfid(DMS) in der reinen marinen Atmosphäre und beherrschen den globalen Abbau von DMS. In Gebieten mit starker Luftverschmutzung kann das Oxidationsvermögen von nächtlich gebildeten Nitratradikalen (NO3) jenes von OH am Tage bei Weitem übertreffen. Während so genannter …
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Chemical composition and pH of marine aerosols in the summer-time marine boundary layer of the Atlantic sector of the Southern Ocean
… variation of aerosol pH and its drivers in the marine boundary layer of the summertime Southern Ocean. Results are presented from Ambient Ion Monitor (online method) and high volume sampler (offline method) based chemical analysis of aerosol species sampled during a cruise from Cape Town …
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Convective Transport of Tropical Marine Boundary Layer Species into the Upper Troposphere and Relation to Species Lifetime: In Situ Measurements and Global Model Simulation
… of UT enhancement. The ratio of UT to boundary-layer (BL) concentration is used as a simple metric to characterize the efficiency of convective transport. The UT-BL ratios are found to have a compact relationship with tracers’ photochemical lifetimes. In addition to observed data, we …
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An Investigation of the Relationship Between Low Cloud Cover And Lower Tropospheric Stability Using MISR
Marine boundary layer clouds account for a significant amount of uncertainty in future climate change projections from general circulation models (GCMs). To reduce the uncertainty of the role of clouds in GCMs, improved cloud parameterizations and evaluations of these parameterizations are often …
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The Measurement of Atmospheric Species with Absorptions Close to the Actinic Flux Cut-Off by Active & MAX-DOAS: Chlorine Monoxide (CIO) & Sulphur Dioxide (SO2)
… primarily from sea salt aerosols in the marine boundary layer, but direct spectroscopic observations have been limited. In this research, we endeavour to identify and quantify ClO in a mid-latitude urban atmosphere removed from a large source of salt water, using techniques of …
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Development, Validation, and Application of Methods for High Time-Response Measurement of Gaseous Atmospheric Chlorinated Species
… make continuous HCl measurements in the polluted marine boundary layer during the Halifax Fog and Air Quality Study (HaliFAQS). Bimodal HCl features in the high irradiance days indicated two photochemical processes; (1) morning time photolysis of Cl precursors, and (2) midday formation of nitric …
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Rotational Transformation Methods for Radio Occultation and Passive Microwave Radiometry Colocation Analysis
… high vertical resolution retrievals in the Marine Boundary Layer but by itself is unable to distinguish between the contributions of water vapor and the “dry” atmosphere. MWR instruments have inherent biases in antenna temperature. GNSS-RO and MWR measurements taken within the same …
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Physical and chemical characterization of single atmospheric aerosols: Laboratory studies of interactions of acidic trace gases with sea -salt aerosols, and, Development efforts for an aerosol charging system using a corona discharge
… to simulate conditions found in a polluted marine boundary layer. The reactive uptake coefficient between nitric acid and sea-salt aerosols under a variety of relative humidity and alkalinity conditions was measured. The uptake coefficient varied strongly with changes in relative humidity, …
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Mechanistic, sensitivity, and uncertainty studies of the atmospheric oxidation of dimethylsulfide
… box model of the DMS cycle in the remote marine boundary layer is used to identify important DMS-related parameters and propagate parameter uncertainties to the sulfur-containing species. This analysis shows that the concentrations of DMS and sulfur dioxide (SO2) are sensitive to …
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A kinetic and spectroscopic study of chemistry relating to the atmospheric role of iodine species
… implications for particle formation in the marine boundary layer (MBL). The reaction of Cl atoms with alkyl iodides, CH3I and CH212, has been studied in detail by the detection of adducts formed in these reactions, which have been observed by LIF for the first time, and is the subject of …
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On the role of high frequency waves in ocean altimetry
… flow, and turbulent fluxes within the marine boundary layer. This uncommon ensemble provides the means to address several specific altimeter-related topics. First, we examine and document the impact that non wind-driven gravity wave variability, e.g. swell, has upon the commonly-invoked …
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Spectroscopic measurements of atmospheric trace gases at Neumayer-Station, Antarctica
… the influence of halogen compounds on the ozone layer, and to improve our understanding of the mechanisms leading to the ozone hole. The diurnal and seasonal variation of the observed stratospheric trace gases are in good agreement with the current understanding of atmospheric chemistry. Numerous …
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