Temporal trends in gaseous mercury evasion from the Mediterranean seawaters

2000 ◽  
Vol 259 (1-3) ◽  
pp. 183-190 ◽  
Author(s):  
R. Ferrara ◽  
B. Mazzolai ◽  
E. Lanzillotta ◽  
E. Nucaro ◽  
N. Pirrone
Keyword(s):  
Temporal Trends ◽  
Gaseous Mercury ◽  
The Mediterranean

Dissolved gaseous mercury (DGM) in the Mediterranean Sea: Spatial and temporal trends

2017 ◽  
Vol 193 ◽  
pp. 8-19 ◽  
Author(s):  
Jože Kotnik ◽  
Milena Horvat ◽  
Ermira Begu ◽  
Yaroslav Shlyapnikov ◽  
Francesca Sprovieri ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Temporal Trends ◽  
Gaseous Mercury ◽  
Dissolved Gaseous Mercury ◽  
The Mediterranean ◽  
Spatial And Temporal Trends

scholarly journals Worldwide atmospheric mercury measurements: a review and synthesis of spatial and temporal trends

2010 ◽  
Vol 10 (1) ◽  
pp. 1261-1307 ◽  
Author(s):  
F. Sprovieri ◽  
N. Pirrone ◽  
R. Ebinghaus ◽  
H. Kock ◽  
A. Dommergue
Keyword(s):  
Temporal Trends ◽  
Ambient Air ◽  
Atmospheric Mercury ◽  
Water Soluble ◽  
Polar Regions ◽  
Mercury Emissions ◽  
Gaseous Mercury ◽  
National Programs ◽  
Spatial And Temporal Trends

Abstract. A large number of activities have been carried out during the last decade in different regions of the world, including polar regions, aiming to assess the level of mercury (Hg) species in ambient air and in precipitation observing their variation over time and with changing meteorological conditions. Following the discovery of atmospheric Hg depletion events (AMDEs) in Polar Regions several studies have indeed been conducted in order to assess the chemical-physical mechanisms related to AMDEs occurred in polar atmospheres with special attention to the consequences of these phenomena in terms of contamination of polar environment due to the rapid conversion of atmospheric gaseous Hg (Hg0) into reactive and water-soluble forms that may potentially become bioavailable. The understanding of the way in which mercury released to the atmosphere is eventually incorporated into biota is of crucial importance not only for the polar regions but also for the marine environment in general. The world's oceans and seas are in fact both sources and sinks of Hg and although it appears that the atmosphere is the major transport/distribution medium for Hg, because most Hg emissions are to the atmosphere, oceans and seas also play an important role. Currently, however, a coordinated observational network for Hg does not exist. There are a number of state and national programs that are collecting atmospheric Hg data but the parameters monitored, the locations of the monitoring sites and the methods employed may prohibit their utility in assessing Hg long-trend variations. The large increase in mercury emissions in fast developing countries (i.e., China, India) over the last decade due primarily to a sharp increase in energy production from the combustion of coal are not currently reflected in the long-term measurements of total gaseous mercury in ambient air and in precipitation data at several continuous monitoring sites in North Europe and North America. The discrepancy between observed gaseous mercury concentrations (steady or decreasing) and global mercury emission inventories (increasing) is not yet clear however, could be at least in part accounted by the increasing in the potential oxidation of the atmosphere recently documented. Therefore, measurements of other key atmospheric constituents at the global monitoring sites are necessary for us to develop a better understanding of the global redistribution of Hg and to further refine model parameterizations of the key processes. The sharing of data from this network, allowing, in fact, access to comparable and long-term data from a wide array of locations for understanding temporal and spatial patterns of Hg transport, deposition and re-emission process producing thus data that will support the validation of regional and global atmospheric Hg models. This paper presents a detailed overview of atmospheric mercury measurements conducted in the Northern and Southern Hemispheres at several terrestrial sites (industrial, rural and remote) during the last decade as well as measurements performed over the world's ocean and seas and in Polar Regions with reference to the monitoring techniques and location of monitoring sites in most of the continents.

scholarly journals Wikipedia, Google Trends and Diet: Assessment of Temporal Trends in the Internet Users’ Searches in Italy before and during COVID-19 Pandemic

Nutrients ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 3683
Author(s):  
Daniele Nucci ◽  
Omar Enzo Santangelo ◽  
Mariateresa Nardi ◽  
Sandro Provenzano ◽  
Vincenza Gianfredi
Keyword(s):  
Temporal Trends ◽  
Google Trends ◽  
The Internet ◽  
Intermittent Fasting ◽  
Web Searches ◽  
Policy Makers ◽  
Internet Users ◽  
Diet Assessment ◽  
The Mediterranean ◽  
Educational Campaigns

We obtained data from Google Trends and Wikipedia in order to assess whether an analysis of Internet searches could provide information on the Internet users’ behaviour/interest in diets. Differences in seasonality, year and before/during COVID-19 pandemic were assessed. From Wikipedia, we extracted the number of times a page is viewed by users, aggregated on monthly and seasonal bases. We also used Google Trends to evaluate the frequency of the users’ web searches. The Mediterranean diet was the most frequently (33.9%), followed by the pescatarian diet (9.0%). Statistically, significant seasonal differences were found for the Mediterranean, vegetarian, Atkins, Scarsdale, and zone diets and pescetarianism. The most commonly searched diet and consequent diet-related queries on Google resulted to be: Dukan diet, Dukan and weight loss. Ketogenic, FODMAP and intermittent fasting diets were statistically more frequently searched during the pandemic compared with before. Our data show a different trend of searches based on the seasonality, year and the pandemic. These data could be useful for scientists, practitioners and policy makers because they can inform educational campaigns via the Internet, especially in periods when the population is more receptive.

scholarly journals Spatial Distribution and Abundance of Mesopelagic Fish Biomass in the Mediterranean Sea

2020 ◽  
Vol 7 ◽  
Author(s):  
Morane Clavel-Henry ◽  
Chiara Piroddi ◽  
Federico Quattrocchi ◽  
Diego Macias ◽  
Villy Christensen
Keyword(s):  
Spatial Distribution ◽  
Mediterranean Sea ◽  
Temporal Trends ◽  
Temporal Patterns ◽  
Mesopelagic Fish ◽  
Fish Biomass ◽  
Spatial And Temporal Patterns ◽  
Temporal And Spatial Distribution ◽  
Key Species ◽  
The Mediterranean

Mesopelagic fish, being in the middle of the trophic web, are important key species for the marine environment; yet limited knowledge exists about their biology and abundance. This is particularly true in the Mediterranean Sea where no regional assessment is currently undertaken regarding their biomass and/or distribution. This study evaluates spatial and temporal patterns of mesopelagic fish biomass in the 1994–2011 period. We do that for the whole Mediterranean Sea using two well-established statistical models, the Generalized Additive Model (GAM) and Random Forest (RF). Results indicate that the bathymetry played an important role in the estimation of mesopelagic fish biomass and in its temporal and spatial distribution. The average biomass over the whole time period reached 1.08 and 0.10 t/km2, depending on the model considered. The Western Mediterranean and Ionian Seas were the sub-regions with the highest biomass, while the Adriatic was the area with the lowest. Temporal trends showed different trajectories with steep decrease and a fluctuation, using respectively RF and GAM. This study constitutes the first attempt to estimate the biomass and the spatial temporal patterns of mesopelagic fish using environmental variables as predictors. Given the growing interest in mesopelagic fish, our study sets a baseline to further develop mesopelagic fish biomass assessments in the region. Our results stress the need to improve data collection and quality in the region while identifying appropriate tools to better understand and assess the processes behind mesopelagic fish dynamics in the basin.

Mercury in the Mediterranean, part I: spatial and temporal trends

2013 ◽  
Vol 21 (6) ◽  
pp. 4063-4080 ◽  
Author(s):  
Jože Kotnik ◽  
Francesca Sprovieri ◽  
Nives Ogrinc ◽  
Milena Horvat ◽  
Nicola Pirrone
Keyword(s):  
Temporal Trends ◽  
The Mediterranean ◽  
Spatial And Temporal Trends

Dissolved radon and gaseous mercury in the Mediterranean seawater

2008 ◽  
Vol 99 (7) ◽  
pp. 1068-1074 ◽  
Author(s):  
Janja Vaupotič ◽  
Asta Gregorič ◽  
Jože Kotnik ◽  
Milena Horvat ◽  
Nicola Pirrone
Keyword(s):  
Gaseous Mercury ◽  
The Mediterranean

scholarly journals On the trophic regimes of the Mediterranean Sea: a satellite analysis

2009 ◽  
Vol 6 (2) ◽  
pp. 139-148 ◽  
Author(s):  
F. D'Ortenzio ◽  
M. Ribera d'Alcalà
Keyword(s):  
Mediterranean Sea ◽  
Spring Bloom ◽  
Chlorophyll Concentration ◽  
Temporal Trends ◽  
Western Mediterranean ◽  
Present Knowledge ◽  
The North ◽  
The Mediterranean ◽  
Satellite Analysis ◽  
North Western

Abstract. The ten years of the SeaWiFS satellite surface chlorophyll concentration observations, presently available, were used to characterize the biogeography of the Mediterranean Sea and the seasonal cycle of the surface biomass in different areas of the basin. The K-means cluster analysis was applied on the satellite time-series of chlorophyll concentration. The resulting coherent patterns were then explained on the basis of the present knowledge of the basin's functioning. Winter biomass enhancements were shown to occur in most of the basin and last for 2–3 months depending on the region. Classical spring bloom regimes were also observed, regularly in the North Western Mediterranean, and intermittently in four other specific areas. The geographical correspondence between specific clusters and regions showing high values of mean chlorophyll concentration indicates that, at least in the Mediterranean Sea, accumulations of phytoplankton are observed only where specific temporal trends are present.

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