The Experts below are selected from a list of 8616 Experts worldwide ranked by ideXlab platform
Karol Kuliński - One of the best experts on this subject based on the ideXlab platform.
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Mercury in suspended matter of the Gulf of Gdańsk: Origin, distribution and transport at the land–sea interface
Marine Pollution Bulletin, 2017Co-Authors: Agnieszka Jędruch, Urszula Kwasigroch, Magdalena Bełdowska, Karol KulińskiAbstract:Abstract The coastal regions of inland seas are particularly vulnerable to Hg pollution. An important carrier of toxic Hg in the marine environment is suspended matter originating from multiple sources. The present study was conducted in the Gulf of Gdansk and its adjoining land in the years 2011–2013. The results indicated that the HgSPM (Hg bound with suspended particulate matter) concentrations varied horizontally and vertically and were dependent on the water dynamics and the composition of organic matter. Conditions favourable for the accumulation of matter and adsorption of reactive gaseous mercury led to increasing HgSPM levels, which are especially hazardous in the case of semi-enclosed areas such as estuaries. These conditions also increase the Hg loads into the trophic chain through suspension feeders. Moreover, the HgSPM concentration was significantly affected by Seasonal Phenomena (mainly coastal erosion) and the quantity and quality of primary production (phytoplankton blooms, mainly Mesodinium rubrum).
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Mercury in suspended matter of the Gulf of Gdańsk: Origin, distribution and transport at the land-sea interface.
Marine pollution bulletin, 2017Co-Authors: Agnieszka Jędruch, Urszula Kwasigroch, Magdalena Bełdowska, Karol KulińskiAbstract:The coastal regions of inland seas are particularly vulnerable to Hg pollution. An important carrier of toxic Hg in the marine environment is suspended matter originating from multiple sources. The present study was conducted in the Gulf of Gdańsk and its adjoining land in the years 2011-2013. The results indicated that the HgSPM (Hg bound with suspended particulate matter) concentrations varied horizontally and vertically and were dependent on the water dynamics and the composition of organic matter. Conditions favourable for the accumulation of matter and adsorption of reactive gaseous mercury led to increasing HgSPM levels, which are especially hazardous in the case of semi-enclosed areas such as estuaries. These conditions also increase the Hg loads into the trophic chain through suspension feeders. Moreover, the HgSPM concentration was significantly affected by Seasonal Phenomena (mainly coastal erosion) and the quantity and quality of primary production (phytoplankton blooms, mainly Mesodinium rubrum).
Jana E. Compton - One of the best experts on this subject based on the ideXlab platform.
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Factors influencing export of dissolved inorganic nitrogen by major rivers: A new, Seasonal, spatially explicit, global model
Global Biogeochemical Cycles, 2014Co-Authors: Michelle L. Mccrackin, John A. Harrison, Jana E. ComptonAbstract:Substantial effort has focused on understanding spatial variation in dissolved inorganic nitrogen (DIN) export to the coastal zone and specific basins have been studied in depth. Much less is known, however, about Seasonal patterns and controls of coastal DIN delivery across large spatial scales. Understanding Seasonal patterns of DIN export is critical to efforts to predict impacts of coastal eutrophication, such as algal blooms and hypoxic areas, which are often Seasonal Phenomena. Here we describe, test, and apply a global model that predicts Seasonal DIN export to coastal regions for >6000 rivers using the Nutrient Export from Watersheds (NEWS2) model. NEWS2-DIN-S used spatially explicit, Seasonal N inputs and was calibrated with measured DIN yield (kg N km−2 season−1) for 77 rivers, distributed globally. Of the characteristics considered, DIN-transport efficiency was positively related to runoff and negatively related to temperature (r2 = 0.34–0.60, depending on season p
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factors influencing export of dissolved inorganic nitrogen by major rivers a new Seasonal spatially explicit global model
Global Biogeochemical Cycles, 2014Co-Authors: Michelle L. Mccrackin, John A. Harrison, Jana E. ComptonAbstract:Substantial effort has focused on understanding spatial variation in dissolved inorganic nitrogen (DIN) export to the coastal zone and specific basins have been studied in depth. Much less is known, however, about Seasonal patterns and controls of coastal DIN delivery across large spatial scales. Understanding Seasonal patterns of DIN export is critical to efforts to predict impacts of coastal eutrophication, such as algal blooms and hypoxic areas, which are often Seasonal Phenomena. Here we describe, test, and apply a global model that predicts Seasonal DIN export to coastal regions for >6000 rivers using the Nutrient Export from Watersheds (NEWS2) model. NEWS2-DIN-S used spatially explicit, Seasonal N inputs and was calibrated with measured DIN yield (kg N km−2 season−1) for 77 rivers, distributed globally. Of the characteristics considered, DIN-transport efficiency was positively related to runoff and negatively related to temperature (r2 = 0.34–0.60, depending on season p < 0.0001), likely due to flushing effects and increased retention by plants and soils, respectively. NEWS2-DIN-S incorporated these insights and performed well in predicting DIN yield (Nash-Sutcliffe Efficiency = 0.54–0.65, depending on season). Catchments were effective in retaining DIN and average export rates were lower during the growing season (3–5% of total nitrogen inputs) compared to other seasons (6–10%) for major latitude bands. Model output was insensitive to changes in the magnitude of N inputs, suggesting that refinement of Seasonal N input budgets will not substantially improve model performance. Rather, better representation of land-to-river N transfers could improve future models because of strong landscape N attenuation.
Michelle L. Mccrackin - One of the best experts on this subject based on the ideXlab platform.
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Factors influencing export of dissolved inorganic nitrogen by major rivers: A new, Seasonal, spatially explicit, global model
Global Biogeochemical Cycles, 2014Co-Authors: Michelle L. Mccrackin, John A. Harrison, Jana E. ComptonAbstract:Substantial effort has focused on understanding spatial variation in dissolved inorganic nitrogen (DIN) export to the coastal zone and specific basins have been studied in depth. Much less is known, however, about Seasonal patterns and controls of coastal DIN delivery across large spatial scales. Understanding Seasonal patterns of DIN export is critical to efforts to predict impacts of coastal eutrophication, such as algal blooms and hypoxic areas, which are often Seasonal Phenomena. Here we describe, test, and apply a global model that predicts Seasonal DIN export to coastal regions for >6000 rivers using the Nutrient Export from Watersheds (NEWS2) model. NEWS2-DIN-S used spatially explicit, Seasonal N inputs and was calibrated with measured DIN yield (kg N km−2 season−1) for 77 rivers, distributed globally. Of the characteristics considered, DIN-transport efficiency was positively related to runoff and negatively related to temperature (r2 = 0.34–0.60, depending on season p
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factors influencing export of dissolved inorganic nitrogen by major rivers a new Seasonal spatially explicit global model
Global Biogeochemical Cycles, 2014Co-Authors: Michelle L. Mccrackin, John A. Harrison, Jana E. ComptonAbstract:Substantial effort has focused on understanding spatial variation in dissolved inorganic nitrogen (DIN) export to the coastal zone and specific basins have been studied in depth. Much less is known, however, about Seasonal patterns and controls of coastal DIN delivery across large spatial scales. Understanding Seasonal patterns of DIN export is critical to efforts to predict impacts of coastal eutrophication, such as algal blooms and hypoxic areas, which are often Seasonal Phenomena. Here we describe, test, and apply a global model that predicts Seasonal DIN export to coastal regions for >6000 rivers using the Nutrient Export from Watersheds (NEWS2) model. NEWS2-DIN-S used spatially explicit, Seasonal N inputs and was calibrated with measured DIN yield (kg N km−2 season−1) for 77 rivers, distributed globally. Of the characteristics considered, DIN-transport efficiency was positively related to runoff and negatively related to temperature (r2 = 0.34–0.60, depending on season p < 0.0001), likely due to flushing effects and increased retention by plants and soils, respectively. NEWS2-DIN-S incorporated these insights and performed well in predicting DIN yield (Nash-Sutcliffe Efficiency = 0.54–0.65, depending on season). Catchments were effective in retaining DIN and average export rates were lower during the growing season (3–5% of total nitrogen inputs) compared to other seasons (6–10%) for major latitude bands. Model output was insensitive to changes in the magnitude of N inputs, suggesting that refinement of Seasonal N input budgets will not substantially improve model performance. Rather, better representation of land-to-river N transfers could improve future models because of strong landscape N attenuation.
Agnieszka Jędruch - One of the best experts on this subject based on the ideXlab platform.
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Mercury in suspended matter of the Gulf of Gdańsk: Origin, distribution and transport at the land–sea interface
Marine Pollution Bulletin, 2017Co-Authors: Agnieszka Jędruch, Urszula Kwasigroch, Magdalena Bełdowska, Karol KulińskiAbstract:Abstract The coastal regions of inland seas are particularly vulnerable to Hg pollution. An important carrier of toxic Hg in the marine environment is suspended matter originating from multiple sources. The present study was conducted in the Gulf of Gdansk and its adjoining land in the years 2011–2013. The results indicated that the HgSPM (Hg bound with suspended particulate matter) concentrations varied horizontally and vertically and were dependent on the water dynamics and the composition of organic matter. Conditions favourable for the accumulation of matter and adsorption of reactive gaseous mercury led to increasing HgSPM levels, which are especially hazardous in the case of semi-enclosed areas such as estuaries. These conditions also increase the Hg loads into the trophic chain through suspension feeders. Moreover, the HgSPM concentration was significantly affected by Seasonal Phenomena (mainly coastal erosion) and the quantity and quality of primary production (phytoplankton blooms, mainly Mesodinium rubrum).
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Mercury in suspended matter of the Gulf of Gdańsk: Origin, distribution and transport at the land-sea interface.
Marine pollution bulletin, 2017Co-Authors: Agnieszka Jędruch, Urszula Kwasigroch, Magdalena Bełdowska, Karol KulińskiAbstract:The coastal regions of inland seas are particularly vulnerable to Hg pollution. An important carrier of toxic Hg in the marine environment is suspended matter originating from multiple sources. The present study was conducted in the Gulf of Gdańsk and its adjoining land in the years 2011-2013. The results indicated that the HgSPM (Hg bound with suspended particulate matter) concentrations varied horizontally and vertically and were dependent on the water dynamics and the composition of organic matter. Conditions favourable for the accumulation of matter and adsorption of reactive gaseous mercury led to increasing HgSPM levels, which are especially hazardous in the case of semi-enclosed areas such as estuaries. These conditions also increase the Hg loads into the trophic chain through suspension feeders. Moreover, the HgSPM concentration was significantly affected by Seasonal Phenomena (mainly coastal erosion) and the quantity and quality of primary production (phytoplankton blooms, mainly Mesodinium rubrum).
Tarun Gupta - One of the best experts on this subject based on the ideXlab platform.
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chemical characterization and source apportionment of submicron pm1 aerosol in kanpur region india
Aerosol and Air Quality Research, 2010Co-Authors: Abhishek Chakraborty, Tarun GuptaAbstract:PM1 (particles having aerodynamic diameter < 1.0 µm) concentrations were measured at a sampling site inside the Indian Institute of Technology (IIT) Kanpur campus for 11 months from July, 2008–May, 2009. The sampling was carried out for all the major seasons of India and a total of 90 samples were collected. The chemical speciation data in terms of element and anion concentrations of all the collected samples were closely studied for any Seasonal Phenomena and different source contributions to PM1 mass. Average PM1 concentration was found to be highest (199 µg/m 3 ) during winter and lowest (31 µg/m 3 ) during monsoon season. Concentrations of different elements and anions also followed similar trend as PM1 concentration. Nitrate and sulfate were the two most predominant anionic species contributing to almost 80%–90% of total anionic concentrations. Crustal elements (Ca, Mg, and Fe) were the main contributors within the total elemental concentrations. Overall, it was found that anions contributed up to 35% of the total PM1 mass. Factor Analysis of chemical speciation data and UNMIX (Version 6) revealed that secondary sources and vehicular emissions were the two main sources contributing to PM1 mass with minor contributions from paved road dust and coal combustion sources.