Download or read book Chromophoric Dissolved Organic Matter CDOM from Estuarine Coastal and Offshore Waters of the Gulf of Maine written by Mike Novak and published by . This book was released on 2004 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variations of the Absorption of Chromophoric Dissolved Organic Matter in the Pearl River Estuary written by Lei Xia and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of in-situ measurements during a spring cruise survey in the Pearl River Estuary (PRE) reveals that, controlled by the two-layer gravitational circulation, chromophoric dissolved organic matter (CDOM) absorption shows a clear horizontal distribution pattern at both water surface and bottom, with higher CDOM absorption and lower spectral slope in the northwestern estuary, and a reversed pattern in the southeastern estuary and near the Hong Kong waters. The surface CDOM has higher absorption and lower spectral slope than the bottom. Horizontal transport is suggested to be the dominant hydrodynamic mechanism affecting CDOM distribution pattern in the PRE. With a regional algorithm tailored for the PRE CDOM absorption retrieval, a time series of CDOM absorption and spectral slope in the PRE and the Hong Kong waters in spring from 2012 to 2018 is produced based on satellite images obtained by four sensors with different spatial and spectral resolutions: the Visible Infrared Imaging Radiometer Suite (VIIRS), the Ocean and Land Colour Instrument (OLCI), the Hyperspectral Imager for the Coastal Ocean (HICO), and the Operational Land Imager (OLI). A correlation is revealed between the multi-temporal CDOM absorption and the monthly averaged river discharge, indicating the capability of CDOM ocean color products in identifying hydrodynamic processes in estuaries and coastal waters.
Download or read book Are Subterranean Estuaries a Source of Chromophoric Dissolved Organic Matter CDOM to the Coastal Ocean written by I. Gusti Ngurah Agung Suryaputra and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In a simple SGD model, CDOM concentrations in the bay were predicted by multiplying 222Rn concentrations in the bay (as a measure for SGD) with CDOM concentrations in the well (as the groundwater endmember). This was done for each hour during the entire sampling period. If a lag-time of one hour between groundwater and bay was considered, the predicted CDOM significantly correlated (p
Download or read book Seasonal Variations in Colloidal Chromophoric Dissolved Organic Matter CDOM in the Damariscotta River Estuary Maine written by Sheri Ann Floge and published by . This book was released on 2005 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct and Indirect Photoreactions of Chromophoric Dissolved Organic Matter written by Jared Verrill Goldstone and published by . This book was released on 2002 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photochemical transformations of chromophoric dissolved organic matter (CDOM) are one of the principal processes controlling its fate in coastal waters. The photochemical decomposition of CDOM leads to the formation of a variety of biologically available carbon substrates. Photomineralization of CDOM to dissolved inorganic carbon may constitute a significant flux in the global carbon cycle. Photoreactions ultimately lead to the destruction of the chromophores and hence to the loss of absorption and fluorescence (bleaching), thus acting as a sink for CDOM. Photodecomposition may proceed both via direct photochemical reactions, following absorption of photons by CDOM, or via indirect processes, involving DOM reactions with photochemically generated intermediates such as reactive oxygen species (ROS). The reactions of CDOM with two important ROS, superoxide (02- ) and hydroxyl radical (OH), have different consequences. Superoxide reactions with CDOM did not appear to degrade the CDOM. Instead, CDOM catalysed the dismutation of 02- to 02 and HOOH. This reactivity has the effect of limiting the steady-state concentration of 02- in most coastal waters. In contrast, reactions of CDOM with radiolytically produced OH formed CO2 and several low molecular weight carboxylic acids, as well as bleached both the absorption and fluorescence at slow rates. These reactions did not increase the bioavailability of this material to a microbial consortium. Both direct and indirect photochemical processes are expected to be accelerated by the presence of iron.
Download or read book Transport and Transformation of Chromophoric Dissolved Organic Matter CDOM from Land to Ocean written by Wei Huang and published by . This book was released on 2010 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chromophoric Dissolved Organic Matter CDOM in Natural Waters written by Rossana Del Vecchio and published by . This book was released on 2002 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surfactants and Chromophoric Dissolved Organic Matter CDOM in the Atlantic Ocean Surface Microlayer and the Corresponding Underlying Waters written by Bita Sabbaghzadeh and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Colored Dissolved Organic Matter CDOM Optical Properties Nutrients and Salinity in Coastal Florida written by Ana Rosa Arellano and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thus, hypothesis testing showed that there was a significant difference between northern and southern springs Hypothesis testing also showed that there is a significant and unexpected positive relationship between CDOM and salinity studying Kings Bay, which is due to the low CDOM concentration in the springs discharging fresh water. This unique dataset also determined that the intercept of the mixing line was significantly different form zero. This indicates that CDOM is present and detectable at very low concentrations. Parallel Factor Analysis (PARAFAC) was used to evaluate CDOM composition from excitation emission matrix spectra (EEMs) and five components were identified: two humic, two marine humic, and one protein-like. The marine-like components, peak M, were produced in the marine environment and in meteoric groundwater. The study found a unique groundwater marker for coastal regions. Northern Kings Bay sites were characterized by a protein-like component, which has been associated with wastewater. Additional optical and environmental parameters were used in discriminate analysis, which successfully identified the CDOM markers for both natural and anthropogenic sources of nutrients in the environment. It is vital to improve the analysis of water, nutrients, and carbon from groundwater discharge into the coastal zone. Elevated DIN concentrations in groundwater are a widespread problem in Florida and over the past 30 years many spring waters have shown an increase in DIN concentrations. Nutrient discharge into delicate coastal areas can lead to ecological concerns. Investigating CDOM and nutrient distribution together can be a beneficial tool that can help differentiate sources from riverine/lacustrine, estuarine, marine, groundwater, and sewage impacted categories.
Download or read book The Source Cycling and Behavior of Chromophoric Dissolved Organic Matter in Coastal Waters written by and published by . This book was released on 2008 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our long term research goal is to ascertain the nature and magnitude of optical effects (absorbance / fluorescence / scattering) in surface seawaters associated with the production and cycling of marine colloidal organic matter. We are particularly interested in determining how these effects are driven or modulated by the productivity dynamics of phytoplankton and marine heterotrophic bacteria in coastal regions not directly influenced by high riverine inputs of terrestrially-derived materials.
Download or read book Optical Properties of Chromophoric Dissolved Organic Matter CDOM in the Bering Strait and Chukchi Sea written by Melissa A. Ferenac and published by . This book was released on 2006 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The optics of chromophoric dissolved organic matter CDOM in the Greenland Sea written by C.A. STEDMON and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sources and Fate of Chromophoric Dissolved Organic Matter in the Arctic Ocean and Surrounding Watersheds written by Sally Annette Walker and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the pace of climate change in the Arctic, it is vital to better constrain terrigenous dissolved organic matter (tDOM) fluctuations in large Arctic Rivers and the role that climate change may bring to tDOM inputs into the Arctic Ocean and to the global carbon cycle. This project uses the optical properties of chromophoric dissolved organic matter (CDOM) to investigate the quality, quantity and fate of dissolved organic matter (DOM) in large Arctic Rivers and the interior Arctic Basin. In large rivers surrounding the Arctic, peak discharge CDOM is largely derived from fresh terrestrial plant material whereas during base flow the CDOM pool has a greater microbial imprint, particularly in the Mackenzie. The higher microbial imprint in the Mackenzie can be explained by longer water residence times, which may be important in a warming climate where increased precipitation rates will likely lead to increased hydrological connectivity and therefore longer water residence times. In surface waters of the Canadian Archipelago, 17 % of the DOM pool is of terrestrial origin, even though waters are diluted with sea ice melt, suggesting the likelihood of a subsurface plume of tDOM entrained within river runoff from Arctic Rivers. In the interior Arctic, an elevated terrestrial CDOM signal in the Eurasian Basin (EB) points to the presence of Eurasian river CDOM entrained within river runoff in the Transpolar Drift. In contrast, autochthonous/microbial CDOM sources become more important the Canadian Basin (CB) and the terrestrial CDOM signal is much lower relative to the EB. A good constraint on the nature and distributions of freshwater (FW) in the Arctic Ocean is paramount to understand the role climate change may play for the Arctic0́9s hydrological cycle. During this study, we used the spatial patterns of terrestrially derived CDOM to better understand the distribution and nature of river runoff across the upper Arctic Basin. This study illustrates the usefulness of CDOM to finger-print water masses within the Arctic Ocean and shows promise to improve our understanding of upper Arctic Ocean ventilation patterns.
Download or read book Characterization of Chromophoric Dissolved Organic Matter CDOM in the Lower Cape Fear River Using Absorbance Spectroscopy and EEM PARAFAC Analysis written by Adam Chase Chase and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chromophoric Dissolved Organic Matter in Coastal Rainwater written by Kelly Jo Gordon and published by . This book was released on 2007 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chromophoric Dissolved Organic Matter in Coastal Rainwater written by Seth Neil Reid and published by . This book was released on 2003 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Properties of Chromophoric Dissolved Organic Matter as a Tracer of Terrestrial Carbon to the Coastal Ocean written by Jennifer Louise Dickson Brown and published by . This book was released on 2009 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
