scholarly journals Changes in atmospheric aerosol loading retrieved from space-based measurements during the past decade

2014 ◽  
Vol 14 (13) ◽  
pp. 6881-6902 ◽  
Author(s):  
J. Yoon ◽  
J. P. Burrows ◽  
M. Vountas ◽  
W. von Hoyningen-Huene ◽  
D. Y. Chang ◽  
...  
Keyword(s):  
Atmospheric Aerosol ◽  
Western Europe ◽  
Weighted Least Squares ◽  
Eastern China ◽  
Atmospheric Pollutants ◽  
Future Climate Change ◽  
Radiation Balance ◽  
Least Squares Regression ◽  
The Past ◽  
Temporal Sampling

Abstract. The role and potential management of short-lived atmospheric pollutants such as aerosols are currently a topic of scientific and public debates. Our limited knowledge of atmospheric aerosol and its influence on the Earth's radiation balance has a significant impact on the accuracy and error of current predictions of future climate change. In the last few years, there have been several accounts of the changes in atmospheric aerosol derived from satellite observations, but no study considering the uncertainty caused by different/limited temporal sampling of polar-orbiting satellites and cloud disturbance in the trend estimates of cloud-free aerosol optical thickness (AOT). This study presents an approach to minimize the uncertainties by use of weighted least-squares regression and multiple satellite-derived AOTs from the space-born instruments, MODIS (onboard Terra from 2000 to 2009 and Aqua form 2003 to 2008), MISR (Terra from 2000 to 2010), and SeaWiFS (OrbView-2 from 1998 to 2007) and thereby provides more convincing trend estimates for atmospheric aerosols during the past decade. The AOT decreases over western Europe (i.e., by up to about −40% from 2003 to 2008). In contrast, a statistically significant increase (about +34% in the same period) over eastern China is observed and can be attributed to the increase in both industrial output and Asian desert dust.

scholarly journals Changes in atmospheric aerosol loading retrieved from space based measurements during the past decade

2013 ◽  
Vol 13 (10) ◽  
pp. 26001-26041 ◽  
Author(s):  
J. Yoon ◽  
J. P. Burrows ◽  
M. Vountas ◽  
W. von Hoyningen-Huene ◽  
D. Y. Chang ◽  
...  
Keyword(s):  
Climate Change ◽  
Atmospheric Aerosols ◽  
Atmospheric Aerosol ◽  
Western Europe ◽  
Global Climate ◽  
Anthropogenic Sources ◽  
Radiation Balance ◽  
Industrialized Countries ◽  
Anthropogenic Pollutants ◽  
The Past

Abstract. Atmospheric aerosol, generated from natural and anthropogenic sources, plays a key role in regulating visibility, air quality, and acid deposition. It is directly linked to and impacts on human health. It also reflects and absorbs incoming solar radiation and thereby influences the climate change. The cooling by aerosols is now recognized to have partly masked the atmospheric warming from fossil fuel combustion emissions. The role and potential management of short-lived climate pollutants such as aerosol are currently a topic of much scientific and public debate. Our limited knowledge of atmospheric aerosol and its influence on the Earth's radiation balance has a significant impact on the accuracy and error of current predictions of the future global climate change. In the past decades, environmental legislation in industrialized countries has begun to limit the release of anthropogenic pollutants. In contrast, in Asia as a result of the recent rapid economic development, emissions from industry and traffic have increased dramatically. In this study, the temporal changes/trends of atmospheric aerosols, derived from the satellite instruments MODIS (on board Terra and Aqua), MISR (Terra), and SeaWiFS (OrbView-2) during the past decade, are investigated. Whilst the aerosol optical thickness, AOT, over Western Europe decreases (i.e. by up to about −40% from 2003 to 2008) and parts of North America, a statistically significant increase (about +34% in the same period) over East China is observed and attributed to both the increase in industrial output and the Asian desert dust.

From Black Death to Black Hole

2018 ◽  
Author(s):  
Marcin Piatkowski
Keyword(s):  
Economic Development ◽  
Black Hole ◽  
Sixteenth Century ◽  
Eastern Europe ◽  
Rule Of Law ◽  
Western Europe ◽  
Black Death ◽  
European Continent ◽  
The Past

In this chapter I explain why Poland and most countries in Eastern Europe have always lagged behind Western Europe in economic development. I discuss why in the past the European continent split into two parts and how Western and Eastern Europe followed starkly different developmental paths. I then demonstrate how Polish oligarchic elites built extractive institutions and how they adopted ideologies, cultures, and values, which undermined development from the late sixteenth century to 1939. I also describe how the elites created a libertarian country without taxes, state capacity, and rule of law, and how this ‘golden freedom’ led to Poland’s collapse and disappearance from the map of Europe in 1795. I argue that Polish extractive society was so well established that it could not reform itself from the inside. It was like a black hole, where the force of gravity is so strong that the light could not come out.

Causes of Death

2018 ◽  
Author(s):  
Michael Anderson ◽  
Corinne Roughley
Keyword(s):  
Heart Disease ◽  
Pulmonary Tuberculosis ◽  
Western Europe ◽  
Causes Of Death ◽  
Whooping Cough ◽  
The Elderly ◽  
World War Two ◽  
World War ◽  
The Past ◽  
Disease Mortality

The principal reported causes of death have changed dramatically since the 1860s, though changes in categorization of causes and improved diagnosis make it difficult to be precise about timings. Diseases particularly affecting children such as measles and whooping cough largely disappeared as killers by the 1950s. Deaths particularly linked to unclean environments and poor sanitary infrastructure also declined, though some can kill babies and the elderly even today. Pulmonary tuberculosis and bronchitis were eventually largely controlled. Reported cancer, stroke, and heart disease mortality showed upward trends well into the second half of the twentieth century, though some of this was linked to diagnostic improvement. Both fell in the last decades of our period, but Scotland still had among the highest rates in Western Europe. Deaths from accidents and drowning saw significant falls since World War Two but, especially in the past 25 years, suicide, and alcohol and drug-related deaths rose.

Arab Historical Writing

2018 ◽  
Author(s):  
Youssef M. Choueiri
Keyword(s):  
Western Europe ◽  
Arab World ◽  
Colonial History ◽  
Historical Writing ◽  
Quarter Century ◽  
The Past ◽  
Historical Writings ◽  
Arabic World

This chapter traces the principal historiographical developments in the Arab world since 1945. It is divided into two major parts. The first part deals with the period extending from 1945 to 1970. During this period the discourse of either socialism or nationalism permeated most historical writings. The second part presents the various attempts made to decolonize, rewrite, or theorize history throughout the Arab world. The chapter then shows how in the various states of the Arabic world—some but not all of which have become fundamentalist Islamic regimes—Western models continued to be followed, though often with a more explicitly socialist approach than would be the case in America or Western Europe. By the 1970s, well before the shake-up of radical Islamicization that has dominated the past quarter-century, the entire Arabic world began to push hard against the dominance of residual Western colonial history.

scholarly journals Monitoring Changes in the Transparency of the Largest Reservoir in Eastern China in the Past Decade, 2013–2020

2021 ◽  
Vol 13 (13) ◽  
pp. 2570
Author(s):  
Teng Li ◽  
Bozhong Zhu ◽  
Fei Cao ◽  
Hao Sun ◽  
Xianqiang He ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Mean Squared Error ◽  
Eastern China ◽  
Water Environment ◽  
Relative Difference ◽  
Boreal Summer ◽  
Support Vector ◽  
Lake Area ◽  
The Past ◽  
Remote Sensing Reflectance

Based on characteristics analysis about remote sensing reflectance, the Secchi Disk Depth (SDD) in the Qiandao Lake was predicted from the Landsat8/OLI data, and its changing rates on a pixel-by-pixel scale were obtained from satellite remote sensing for the first time. Using 114 matchups data pairs during 2013–2019, the SDD satellite algorithms suitable for the Qiandao Lake were obtained through both the linear regression and machine learning (Support Vector Machine) methods, with remote sensing reflectance (Rrs) at different OLI bands and the ratio of Rrs (Band3) to Rrs (Band2) as model input parameters. Compared with field observations, the mean absolute relative difference and root mean squared error of satellite-derived SDD were within 20% and 1.3 m, respectively. Satellite-derived results revealed that SDD in the Qiandao Lake was high in boreal spring and winter, and reached the lowest in boreal summer, with the annual mean value of about 5 m. Spatially, high SDD was mainly concentrated in the southeast lake area (up to 13 m) close to the dam. The edge and runoff area of the lake were less transparent, with an SDD of less than 4 m. In the past decade (2013–2020), 5.32% of Qiandao Lake witnessed significant (p < 0.05) transparency change: 4.42% raised with a rate of about 0.11 m/year and 0.9% varied with a rate of about −0.09 m/year. Besides, the findings presented here suggested that heavy rainfall would have a continuous impact on the Qiandao Lake SDD. Our research could promote the applications of land observation satellites (such as the Landsat series) in water environment monitoring in inland reservoirs.

scholarly journals Workload for radiologists during on-call hours: dramatic increase in the past 15 years

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
R. J. M. Bruls ◽  
R. M. Kwee
Keyword(s):  
Western Europe ◽  
Kendall Test ◽  
Kendall’S Tau ◽  
Kendall's Tau ◽  
X Ray ◽  
The Past ◽  
Relative Value ◽  
Burn Out ◽  
Picture Archiving And Communication ◽  
Ct Studies

Abstract Background The objective of this study is to investigate the workload for radiologists during on-call hours and to quantify the 15-year trend in a large general hospital in Western Europe. Methods Data regarding the number of X-ray, ultrasound and computed tomography (CT) studies during on-call hours (weekdays between 6.00 p.m. and 7.00 a.m., weekends, and national holidays) between 2006 and 2020 were extracted from the picture archiving and communication system. All studies were converted into relative value units (RVUs) to estimate the on-call workload. The Mann–Kendall test was performed to assess the temporal trend. Results The total RVUs during on-call hours showed a significant increase between 2006 and 2020 (Kendall's tau-b = 0.657, p = 0.001). The overall workload in terms of RVUs during on-call hours has quadrupled. The number of X-ray studies significantly decreased (Kendall's tau-b = − 0.433, p = 0.026), whereas the number of CT studies significantly increased (Kendall's tau-b = 0.875, p < 0.001) between 2006 and 2020. CT studies which increased by more than 500% between 2006 and 2020 are CT for head trauma, brain CTA, brain CTV, chest CT (for suspected pulmonary embolism), spinal CT, neck CT, pelvic CT, and CT for suspected aortic dissection. The number of ultrasound studies did not change significantly (Kendall's tau-b = 0.202, p = 0.298). Conclusions The workload for radiologists during on-call hours increased dramatically in the past 15 years. The growing amount of CT studies is responsible for this increase. Radiologist and technician workforce should be matched to this ongoing increasing trend to avoid potential burn-out and to maintain quality and safety of radiological care.

scholarly journals Ozone formation under low solar radiation in eastern China

2019 ◽  
Author(s):  
Xuexi Tie ◽  
Xin Long ◽  
Guohui Li ◽  
Shuyu Zhao ◽  
Jianming Xu
Keyword(s):  
Solar Radiation ◽  
Eastern China ◽  
Threshold Level ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Oh Radicals ◽  
Chemical Production ◽  
The Past ◽  
Photochemical Production ◽  
Steady State Model

Abstract. PM2.5, a particulate matter with a diameter of 2.5 micrometers or less, is one of the major components of the air pollution in eastern China. In the past few years, China's government made strong efforts to reduce the PM2.5 pollutions. However, another important pollutant (ozone) becomes an important problem in eastern China. Ozone (O3) is produced by photochemistry, which requires solar radiation for the formation of O3. Under heavy PM2.5 pollution, the solar radiation is often depressed, and the photochemical production of O3 is prohibited. This study shows that during fall in eastern China, under heavy PM2.5 pollutions, there were often strong O3 photochemical productions, causing a co-occurrence of high PM2.5 and O3 concentrations. This co-occurrence of high PM2.5 and O3 is un-usual and is the main focus of this study. Recent measurements show that there were often high HONO surface concentrations in major Chinese mega cities, especially during daytime, with maximum concentrations ranging from 0.5 to 2 ppbv. It is also interesting to note that the high HONO concentrations were occurred during high aerosol concentration periods, suggesting that there were additional HONO surface sources in eastern China. Under the high daytime HONO concentrations, HONO can be photo-dissociated to be OH radicals, which enhance the photochemical production of O3. In order to study the above scientific issues, a radiative transfer model (TUV; Tropospheric Ultraviolet-Visible) is used in this study, and a chemical steady state model is established to calculate OH radical concentrations. The calculations show that by including the OH production of the photo-dissociated of HONO, the calculated OH concentrations are significantly higher than the values without including this production. For example, by including HONO production, the maximum of OH concentration under the high aerosol condition (AOD = 2.5) is similar to the value under low aerosol condition (AOD = 0.25) in the no-HONO case. This result suggests that even under the high aerosol condition, the chemical oxidizing process for O3 production can occurred, which explain the co-occurrence of high PM2.5 and high O3 in fall season in eastern China. However, the O3 concentrations were not significantly affected by the appearance of HONO in winter. This study shows that the seasonal variation of solar radiation plays important roles for controlling the OH production in winter. When the solar radiation is in a very low level in winter, it reaches the threshold level to prevent the OH chemical production, even by including the HONO production of OH. This study provides some important scientific highlights to better understand the O3 pollutions in eastern China.

Modeling and Interpretation of Tidal Turbine Vibration Through Weighted Least Squares Regression

2020 ◽  
Vol 50 (4) ◽  
pp. 1252-1259 ◽  
Author(s):  
Grant S. Galloway ◽  
Victoria M. Catterson ◽  
Craig Love ◽  
Andrew Robb ◽  
Thomas Fay
Keyword(s):  
Least Squares ◽  
Weighted Least Squares ◽  
Least Squares Regression ◽  
Tidal Turbine

Are the saving decision patterns of bank customers also clouded by psychological biases? Evidence from Ghana

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Joseph Emmanuel Tetteh ◽  
Christopher Boachie
Keyword(s):  
Decision Making ◽  
Loss Aversion ◽  
Design Methodology ◽  
Weighted Least Squares ◽  
Least Squares Regression ◽  
Individual Decision ◽  
Content Type ◽  
Saving Decisions ◽  
The Individual ◽  
Practical Implications

PurposeThis paper attempts to investigate the influence of psychological biases on saving decision-making of bank customers in Ghana.Design/methodology/approachIt employs weighted least squares regression to test the effect of psychological biases on savings decisions of bank customers.FindingsThe findings show that all the nine psychological biases, namely mental accounting, availability, loss aversion, representativeness, anchoring, overconfidence, status quo, framing effect and disposition effect employed for the study have a significant influence on saving decision of bank customers. The results depict that psychological biases are entrenched in the saving pattern of bank customers in Ghana.Practical implicationsFor policy purposes, the study recommends that bank customers need to enhance their knowledge of psychological biases in order to improve their gains from savings, and not to fall prey to these prejudices. The satisfied customer is a dependable source of bank viability and survival.Originality/valueTo the best of the knowledge of the author, this study provides the first empirical evidence of the influence of psychological biases on saving decisions of bank customers in Ghana. The findings of this study will enhance knowledge on the influence of psychological biases on individual decision-making and will accentuate the fact that the individual is not an entirely rational being.

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