scholarly journals Long-Term Trends in Regional Wet Mercury Deposition and Lacustrine Mercury Concentrations in Four Lakes in Voyageurs National Park

2021 ◽  
Vol 11 (4) ◽  
pp. 1879
Author(s):  
Mark E. Brigham ◽  
David D. VanderMeulen ◽  
Collin A. Eagles-Smith ◽  
David P. Krabbenhoft ◽  
Ryan P. Maki ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
National Park ◽  
Total Mercury ◽  
The United States ◽  
Multimedia Data ◽  
Data Sets ◽  
Mercury Deposition ◽  
Continental Scale ◽  
Voyageurs National Park

Although anthropogenic mercury (Hg) releases to the environment have been substantially lowered in the United States and Canada since 1990, concerns remain for contamination in fish from remote lakes and rivers where atmospheric deposition is the predominant source of mercury. How have aquatic ecosystems responded? We report on one of the longest known multimedia data sets for mercury in atmospheric deposition: aqueous total mercury (THgaq), methylmercury (MeHgaq), and sulfate from epilimnetic lake-water samples from four lakes in Voyageurs National Park (VNP) in northern Minnesota; and total mercury (THg) in aquatic biota from the same lakes from 2001–2018. Wet Hg deposition at two regional Mercury Deposition Network sites (Fernberg and Marcell, Minnesota) decreased by an average of 22 percent from 1998–2018; much of the decreases occurred prior to 2009, with relatively flat trends since 2009. In the four VNP lakes, epilimnetic MeHgaq concentrations declined by an average of 44 percent and THgaq by an average of 27 percent. For the three lakes with long-term biomonitoring, temporal patterns in biotic THg concentrations were similar to patterns in MeHgaq concentrations; however, biotic THg concentrations declined significantly in only one lake. Epilimnetic MeHgaq may be responding both to a decline in atmospheric Hg deposition as well as a decline in sulfate deposition, which is an important driver of mercury methylation in the environment. Results from this case study suggest that regional- to continental-scale decreases in both mercury and sulfate emissions have benefitted aquatic resources, even in the face of global increases in mercury emissions.

Asian Americans and Pacific Islanders: Employment Issues in the United States

2011 ◽  
Vol 9 (1-2) ◽  
pp. 58-69
Author(s):  
Marlene Kim
Keyword(s):  
United States ◽  
Asian Americans ◽  
The United States ◽  
Current Data ◽  
Pacific Islanders ◽  
Native Hawaiians ◽  
Data Sets ◽  
High Poverty ◽  
Unemployment Rates

Asian Americans and Pacific Islanders (AAPIs) in the United States face problems of discrimination, the glass ceiling, and very high long-term unemployment rates. As a diverse population, although some Asian Americans are more successful than average, others, like those from Southeast Asia and Native Hawaiians and Pacific Islanders (NHPIs), work in low-paying jobs and suffer from high poverty rates, high unemployment rates, and low earnings. Collecting more detailed and additional data from employers, oversampling AAPIs in current data sets, making administrative data available to researchers, providing more resources for research on AAPIs, and enforcing nondiscrimination laws and affirmative action mandates would assist this population.

scholarly journals Model analyses of atmospheric mercury: present air quality and effects of transpacific transport on the United States

2013 ◽  
Vol 13 (4) ◽  
pp. 9849-9893 ◽  
Author(s):  
H. Lei ◽  
X.-Z. Liang ◽  
D. J. Wuebbles ◽  
Z. Tao
Keyword(s):  
United States ◽  
Air Quality ◽  
Wet Deposition ◽  
Total Mercury ◽  
The United States ◽  
Atmospheric Mercury ◽  
Anthropogenic Sources ◽  
Mercury Deposition ◽  
Transpacific Transport ◽  
Mercury Cycle

Abstract. Atmospheric mercury is a toxic air and water pollutant that is of significant concern because of its effects on human health and ecosystems. A mechanistic representation of the atmospheric mercury cycle is developed for the state-of-the-art global climate-chemistry model, CAM-Chem (Community Atmospheric Model with Chemistry). The model simulates the emission, transport, transformation and deposition of atmospheric mercury (Hg) in three forms: elemental mercury (Hg(0)), reactive mercury (Hg(II)), and particulate mercury (PHg). Emissions of mercury include those from human, land, ocean, biomass burning and volcano related sources. Land emissions are calculated based on surface solar radiation flux and skin temperature. A simplified air–sea mercury exchange scheme is used to calculate emissions from the oceans. The chemistry mechanism includes the oxidation of Hg(0) in gaseous phase by ozone with temperature dependence, OH, H2O2 and chlorine. Aqueous chemistry includes both oxidation and reduction of Hg(0). Transport and deposition of mercury species are calculated through adapting the original formulations in CAM-Chem. The CAM-Chem model with mercury is driven by present meteorology to simulate the present mercury air quality during the 1999–2001 periods. The resulting surface concentrations of total gaseous mercury (TGM) are then compared with the observations from worldwide sites. Simulated wet depositions of mercury over the continental United States are compared to the observations from 26 Mercury Deposition Network stations to test the wet deposition simulations. The evaluations of gaseous concentrations and wet deposition confirm a strong capability for the CAM-Chem mercury mechanism to simulate the atmospheric mercury cycle. The results also indicate that mercury pollution in East Asia and Southern Africa is very significant with TGM concentrations above 3.0 ng m−3. The comparison to wet deposition indicates that wet deposition patterns of mercury are more affected by the spatial variability of precipitation. The sensitivity experiments show that 22% of total mercury deposition and 25% of TGM concentrations in the United States are resulted from domestic anthropogenic sources, but only 9% of total mercury deposition and 7% of TGM concentrations are contributed by transpacific transport. However, the contributions of domestic and transpacific sources on the western United States levels of mercury are of comparable magnitude.

scholarly journals Inequities in Palliative and Dementia Care and Health in Long-Term Supportive Services Settings

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. 329-329
Author(s):  
Abraham Brody
Keyword(s):  
Palliative Care ◽  
The United States ◽  
Routine Care ◽  
Data Sets ◽  
Supportive Services ◽  
Adult Day Centers ◽  
Systemic Factors ◽  
Diverse Society ◽  
The Individual

Abstract Most older adults with serious illness, including Alzheimer’s Disease and Related Dementias (ADRD) reside in community-based settings. These individuals and their care partners rely on Long Term Supportive Services (LTSS) including nursing home, home health, hospice, and adult day centers to provide support. LTSS are often under-resourced and reimbursed however, with significant regulatory restrictions on the care they can provide. These issues combined with other systemic factors in our healthcare system and society, including racism and poverty, lead to substantial inequities. Even preceding the use of LTSS, ADRD is diagnosed later in non-white individuals and access to high-quality services, including palliative care is severely limited. Moreover, few palliative care interventions address ADRD and even fewer have been specifically tailored to address the needs of our multi-cultural, racially and ethnically diverse society. This symposium will therefore utilize data from several nationwide data sets collected as part of routine care for clinical, billing, and/or regulatory purposes to assess inequities that exist across LTSS sites related to ADRD and palliative care. The individual abstracts show a clear pattern of inequities that stem from endemic systems failures towards people of color in the United States that must be addressed through a multipronged approach. This research shows that policies must be changed to require adequate collection of social determinants of health, to target policies that allow sub-standard or limited access to care, and research and clinical reform to produce a more culturally sensitive approach to care for those with ADRD and other serious illnesses.

Using nestling plasma to assess long-term spatial and temporal concentrations of organochlorine compounds in bald eagles within Voyageurs National Park, Minnesota, USA

Chemosphere ◽  
2015 ◽  
Vol 123 ◽  
pp. 79-86 ◽  
Author(s):  
H. Tyler Pittman ◽  
William W. Bowerman ◽  
Leland H. Grim ◽  
Teryl G. Grubb ◽  
William C. Bridges ◽  
...  
Keyword(s):  
National Park ◽  
Organochlorine Compounds ◽  
Bald Eagles ◽  
Voyageurs National Park

scholarly journals Betwixt and Between: Bridging the Gap Between Field and Repository

2018 ◽  
Vol 2 ◽  
pp. e27042
Author(s):  
Meghan Grizzle
Keyword(s):  
National Park ◽  
Field Work ◽  
The United States ◽  
Online Database ◽  
Archaeological Collections ◽  
Park Service ◽  
Set Up ◽  
Collections Care ◽  
Term Management

All too often, archaeologists have viewed curation as a process that manages, rather than investigates, archaeological and natural history collections. The curation crisis can be understood as the result of a serious imbalance between the continued generation of field collections and a corresponding lack of resources and facilities devoted to accessioning, analyzing, reporting, curating and otherwise caring for these collections. Researchers mistakenly prioritize ‘interpretation at the trowel’s edge’ with emphasis on excavation and field work, without considering the problem of how and where to store the objects they excavate. While legislation, Curation of Federally Owned and Administered Archaeological Collections (36 C.F.R. Part 79), was intended to ensure the long-term management and care of these resources, the absence of funding at the institutional and federal levels, nonexistent enforcement of the legislation through the National Park Service, and lack of compliance from field archaeologists, have resulted in collections throughout the United States being at risk of loss through deterioration, mismanagement, and neglect. I will demonstrate that accessioning, inventorying, cataloguing, rehousing and conserving are meaningful generative encounters between scholars, objects and collections staff, not simply byproducts of research. The need for an online database specifically set up for archaeological collections is suggested as a way to address the curation crisis. Implementing digitization will enhance preservation by reducing damage to the artifacts caused by physical handling. Persons working within the field will gain a better understanding of collections care and the collections transition to the repository.

scholarly journals Long-term changes in UT/LS ozone between the late 1970s and the 1990s deduced from the GASP and MOZAIC aircraft programs and from ozonesondes

2009 ◽  
Vol 9 (14) ◽  
pp. 5343-5369 ◽  
Author(s):  
C. Schnadt Poberaj ◽  
J. Staehelin ◽  
D. Brunner ◽  
V. Thouret ◽  
H. De Backer ◽  
...  
Keyword(s):  
Electrochemical Cell ◽  
Statistical Significance ◽  
The United States ◽  
Data Sets ◽  
Air Masses ◽  
Long Term Changes ◽  
Research Aircraft ◽  
Atmospheric Sampling ◽  
Aircraft Data

Abstract. We present ozone measurements of the Global Atmospheric Sampling Program (GASP) performed from four commercial and one research aircraft in the late 1970s to compare them with respective measurements of the ongoing MOZAIC project. Multi-annual averages of UT/LS ozone were built using the aircraft data sets (1975–1979 and 1994–2001), and long-term changes between the 1970s and 1990s were derived by comparison. The data were binned relative to the dynamical tropopause to separate between UT and LS air masses. LS data were analysed using equivalent latitudes. In the UT, pronounced increases of 20–40% are found over the Middle East and South Asia in the spring and summer seasons. Increases are also found over Japan, Europe, and the eastern parts of the United States depending on season. LS ozone over northern mid- and high latitudes was found to be lower in the 1990s compared to the 1970s in all seasons of the year. In addition, a comparison with long-term changes deduced from ozonesondes is presented. The early 1970s European Brewer-Mast (BM) sonde data agree with GASP within the range of uncertainty (UT) or measured slightly less ozone (LS). In contrast, the 1990s BM sensors show consistently and significantly higher UT/LS ozone values than MOZAIC. This unequal behaviour of aircraft/sonde comparisons in the 1970s and 1990s leads to differences in the estimated long-term changes over Europe: while the comparison between GASP and MOZAIC indicates ozone changes of −5% to 10% over Europe, the sondes suggest a much larger increase of 10%–35% depending on station and season, although statistical significance is not conclusive due to data sample limitations. In contrast to the BM sondes, the Electrochemical Cell (ECC) sonde at Wallops Island, USA, measured higher UT ozone than both GASP and MOZAIC. Hence, long-term changes from GASP/MOZAIC agree within the range of uncertainty with the changes deduced from Wallops Island.

Mercury in Soils, Lakes, and Fish in Voyageurs National Park (Minnesota):  Importance of Atmospheric Deposition and Ecosystem Factors

2006 ◽  
Vol 40 (20) ◽  
pp. 6261-6268 ◽  
Author(s):  
J. G. Wiener ◽  
B. C. Knights ◽  
M. B. Sandheinrich ◽  
J. D. Jeremiason ◽  
M. E. Brigham ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
National Park ◽  
Voyageurs National Park

scholarly journals Is There Really ‘Another’ Counterexample to the Secularization Thesis? Religious Dynamics in Italy Between 1910 and 2013

2021 ◽  
Author(s):  
Ettore Scappini
Keyword(s):  
United States ◽  
Western Country ◽  
Religious Practice ◽  
The United States ◽  
Data Sets ◽  
Current State ◽  
Regular Manner ◽  
The Many ◽  
Time Use Surveys

Abstract Background Among the modern Western countries where the issue of religiosity has been studied, the United States and Italy offer the only examples of empirically verified periods when religious practice was consolidated or even revived to some extent. A recent study, however, shows that the nature of religious exceptionalism in the United States does not constitute a real counterexample. This leaves Italy as the only country that might provide evidence of the falseness of the assumption that the secularization process is inescapable. Purpose This study seeks to enhance our knowledge about the case of Italy, where the many surveys conducted over the years have produced a wide variety of often divergent results, prompting a fervent debate among scholars. Several authors argue that the level of participation remained almost constant from 1980 to 1990. Others, on the contrary, claim that the level of participation increased between 1980 and 2000. This paper contributes to this path of study, aiming to shed light on the development of religiosity in Italy between 1910 and 2013. Methods Different data sets—time use surveys, ‘stylized surveys’, direct surveys and other kind of data—and an innovative method will be used to develop the reasoning and trace the trend of secularization. Results As will be shown, there are discontinuities in the pattern of religious practice over time. These fractures were due to attrition caused in turn by factors related to economic phenomena like migration and political/ideological subcultures, which temporarily changed the level of religious practice and, at least for a time, counterbalanced the long-term trend away from religious practice. Conclusions and Implications The trends presented suggest that secularization in Italy developed without any discontinuity, leading to confirmation that modernization and religious action ‘counteracted’ each other in an extremely regular manner. Therefore, according to the current state of knowledge, no documented modern Western country constitutes a counterexample to the secularization thesis. It can thus be claimed that modernization and secularization are inextricably linked processes.

scholarly journals Model analyses of atmospheric mercury: present air quality and effects of transpacific transport on the United States

2013 ◽  
Vol 13 (21) ◽  
pp. 10807-10825 ◽  
Author(s):  
H. Lei ◽  
X.-Z. Liang ◽  
D. J. Wuebbles ◽  
Z. Tao
Keyword(s):  
United States ◽  
Air Quality ◽  
Wet Deposition ◽  
Total Mercury ◽  
The United States ◽  
Atmospheric Mercury ◽  
Anthropogenic Sources ◽  
Mercury Deposition ◽  
Transpacific Transport ◽  
Mercury Cycle

Abstract. Atmospheric mercury is a toxic air and water pollutant that is of significant concern because of its effects on human health and ecosystems. A mechanistic representation of the atmospheric mercury cycle is developed for the state-of-the-art global climate-chemistry model, CAM-Chem (Community Atmospheric Model with Chemistry). The model simulates the emission, transport, transformation and deposition of atmospheric mercury (Hg) in three forms: elemental mercury (Hg(0)), reactive mercury (Hg(II)), and particulate mercury (PHg). Emissions of mercury include those from human, land, ocean, biomass burning and volcano related sources. Land emissions are calculated based on surface solar radiation flux and skin temperature. A simplified air–sea mercury exchange scheme is used to calculate emissions from the oceans. The chemistry mechanism includes the oxidation of Hg(0) in gaseous phase by ozone with temperature dependence, OH, H2O2 and chlorine. Aqueous chemistry includes both oxidation and reduction of Hg(0). Transport and deposition of mercury species are calculated through adapting the original formulations in CAM-Chem. The CAM-Chem model with mercury is driven by present meteorology to simulate the present mercury air quality during the 1999–2001 period. The resulting surface concentrations of total gaseous mercury (TGM) are then compared with the observations from worldwide sites. Simulated wet depositions of mercury over the continental United States are compared to the observations from 26 Mercury Deposition Network stations to test the wet deposition simulations. The evaluations of gaseous concentrations and wet deposition confirm a strong capability for the CAM-Chem mercury mechanism to simulate the atmospheric mercury cycle. The general reproduction of global TGM concentrations and the overestimation on South Africa indicate that model simulations of TGM are seriously affected by emissions. The comparison to wet deposition indicates that wet deposition patterns of mercury are more affected by the spatial variability of precipitation. The sensitivity experiments show that 22% of total mercury deposition and 25% of TGM concentrations in the United States result from domestic anthropogenic sources, but only 9% of total mercury deposition and 7% of TGM concentrations are contributed by transpacific transport. However, the contributions of domestic and transpacific sources on the western United States levels of mercury are of comparable magnitude.

scholarly journals Development and Application of a Multipollutant Model for Atmospheric Mercury Deposition

2007 ◽  
Vol 46 (9) ◽  
pp. 1341-1353 ◽  
Author(s):  
Krish Vijayaraghavan ◽  
Christian Seigneur ◽  
Prakash Karamchandani ◽  
Shu-Yun Chen
Keyword(s):  
Atmospheric Deposition ◽  
Wet Deposition ◽  
Model Performance ◽  
The United States ◽  
Comprehensive Treatment ◽  
Precipitation Data ◽  
Mercury Deposition ◽  
Upper Midwest ◽  
Deposition Fluxes ◽  
Normalized Error

Abstract A multipollutant model, the Community Multiscale Air Quality model paired with the Model of Aerosol Dynamics, Reaction, Ionization, and Dissolution (CMAQ-MADRID), is extended to include a comprehensive treatment of mercury processes and is applied to the simulation of the atmospheric deposition of sulfate and mercury over the United States during 1996. Model performance is evaluated first by comparison with annual sulfate wet deposition data from the National Atmospheric Deposition Program’s National Trends Network; the coefficient of determination r 2 is 0.77, and the model normalized error and bias are 53% and −8%, respectively. When actual precipitation data are used to scale the deposition fluxes, r 2 improves to 0.91 and the error and bias change to 42% and −41%, respectively. The scaled results underscore a tendency of the model to underestimate sulfate wet deposition. Model performance for mercury wet deposition is then evaluated by comparison with data from the Mercury Deposition Network. For annual mercury wet deposition, r 2 is 0.28 and the normalized error and bias are 81% and 73%, respectively, when the modeled precipitation data are used. Model performance improves when actual precipitation data are used to scale deposition fluxes: r 2 increases to 0.41 and the error and bias decrease to 40% and 29%, respectively. The model reproduces the spatial pattern of sulfate wet deposition adequately with an increasing gradient from the upper Midwest to the Northeast, that is, from upwind to downwind of large sulfur dioxide sources in the Ohio River Valley. However, the model tends to overestimate mercury wet deposition in the Northeast downwind of these sources that also emit significant amounts of mercury. This “Pennsylvania anomaly” may be due to a partial misrepresentation of the mercury reduction–oxidation cycle, uncertainties in the dry deposition of divalent gaseous mercury HgII, incorrect speciation of mercury emissions, and/or uncharacterized emissions in the upper Midwest.

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