scholarly journals The influence of foreign vs. North American emissions on surface ozone in the US

2009 ◽  
Vol 9 (14) ◽  
pp. 5027-5042 ◽  
Author(s):  
D. R. Reidmiller ◽  
A. M. Fiore ◽  
D. A. Jaffe ◽  
D. Bergmann ◽  
C. Cuvelier ◽  
...  
Keyword(s):  
East Asia ◽  
Surface Ozone ◽  
Source Region ◽  
Effective Means ◽  
The United States ◽  
Model Ensemble ◽  
Emissions Reductions ◽  
Wide Range ◽  
The Us ◽  
The Impact

Abstract. As part of the Hemispheric Transport of Air Pollution (HTAP; http:// www.htap.org) project, we analyze results from 15 global and 1 hemispheric chemical transport models and compare these to Clean Air Status and Trends Network (CASTNet) observations in the United States (US) for 2001. Using the policy-relevant maximum daily 8-h average ozone (MDA8 O3) statistic, the multi-model ensemble represents the observations well (mean r2=0.57, ensemble bias = +4.1 ppbv for all US regions and all seasons) despite a wide range in the individual model results. Correlations are strongest in the northeastern US during spring and fall (r2=0.68); and weakest in the midwestern US in summer (r2=0.46). However, large positive mean biases exist during summer for all eastern US regions, ranging from 10–20 ppbv, and a smaller negative bias is present in the western US during spring (~3 ppbv). In nearly all other regions and seasons, the biases of the model ensemble simulations are ≤5 ppbv. Sensitivity simulations in which anthropogenic O3-precursor emissions (NOx + NMVOC + CO + aerosols) were decreased by 20% in four source regions: East Asia (EA), South Asia (SA), Europe (EU) and North America (NA) show that the greatest response of MDA8 O3 to the summed foreign emissions reductions occurs during spring in the West (0.9 ppbv reduction due to 20% emissions reductions from EA + SA + EU). East Asia is the largest contributor to MDA8 O3 at all ranges of the O3 distribution for most regions (typically ~0.45 ppbv) followed closely by Europe. The exception is in the northeastern US where emissions reductions in EU had a slightly greater influence than EA emissions, particularly in the middle of the MDA8 O3 distribution (response of ~0.35 ppbv between 35–55 ppbv). EA and EU influences are both far greater (about 4x) than that from SA in all regions and seasons. In all regions and seasons O3-precursor emissions reductions of 20% in the NA source region decrease MDA8 O3 the most – by a factor of 2 to nearly 10 relative to foreign emissions reductions. The O3 response to anthropogenic NA emissions is greatest in the eastern US during summer at the high end of the O3 distribution (5–6 ppbv for 20% reductions). While the impact of foreign emissions on surface O3 in the US is not negligible – and is of increasing concern given the recent growth in Asian emissions – domestic emissions reductions remain a far more effective means of decreasing MDA8 O3 values, particularly those above 75 ppb (the current US standard).

scholarly journals The influence of foreign vs. North American emissions on surface ozone in the US

2009 ◽  
Vol 9 (2) ◽  
pp. 7927-7969 ◽  
Author(s):  
D. R. Reidmiller ◽  
A. M. Fiore ◽  
D. A. Jaffe ◽  
D. Bergmann ◽  
C. Cuvelier ◽  
...  
Keyword(s):  
East Asia ◽  
Surface Ozone ◽  
Source Region ◽  
Effective Means ◽  
The United States ◽  
Model Ensemble ◽  
Emissions Reductions ◽  
Wide Range ◽  
The Us ◽  
The Impact

Abstract. As part of the Hemispheric Transport of Air Pollution (HTAP; http://www.htap.org/) project, we analyze results from 16 global and hemispheric chemical transport models and compare these to Clean Air Status and Trends Network (CASTNet) observations in the United States (US) for 2001. Using the policy-relevant maximum daily 8-h ozone (MDA8 O3) statistic, the multi-model ensemble represents the observations well (mean r2=0.57, ensemble bias=+4.1 ppbv for all regions and all seasons) despite a wide range in the individual model results. Correlations are strongest in the NorthEastern US during spring and fall (r2=0.68); and weakest in the Midwestern US in summer (r2=0.46). However, large positive mean biases exist during summer for all Eastern US regions, ranging from 10–20 ppbv, and a smaller negative bias is present in the Western US during spring (~3 ppbv). In most all other regions and seasons, the biases of the model ensemble simulations are ≤5 ppbv. Sensitivity simulations in which anthropogenic O3-precursor emissions (NOx+NMVOC+CO+aerosols) were decreased by 20% in each of four source regions: East Asia (EA), South Asia (SA), Europe (EU) and North America (NA) show that the greatest response of MDA8 O3 to the summed foreign emissions reductions occurs during spring in the West (0.9 ppbv reduction due to 20% reductions from EA+SA+EU). East Asia is the largest contributor to MDA8 O3 at all ranges of the O3 distribution for most regions (typically ~0.45 ppbv). The exception is in the NorthEastern US where European emissions reductions had the greatest impact on MDA8 O3, particularly in the middle of the MDA8 O3 distribution (response of ~0.35 ppbv between 35–55 ppbv). In all regions and seasons, however, O3-precursor emissions reductions of 20% in the NA source region decrease MDA8 O3 the most – by a factor of 2 to nearly 10 relative to foreign emissions reductions. The O3 response to anthropogenic NA emissions is greatest in the Eastern US during summer at the high end of the O3 distribution (5–6 ppbv for 20% reductions). While the impact of foreign emissions on surface O3 in the US is not negligible – and is of increasing concern given the growth in emissions upwind of the US – domestic emissions reductions remain a far more effective means of decreasing MDA8 O3 values, particularly those above 75 ppb (the current US standard).

scholarly journals Quebec’s Economic and Commercial Linkages with the United States, 1994–2017

2017 ◽  
Author(s):  
Earl H. Fry
Keyword(s):  
United States ◽  
Trade Agreement ◽  
The United States ◽  
The North ◽  
Nation States ◽  
Wide Range ◽  
The Us ◽  
Us Government ◽  
Big Picture ◽  
The Impact

This article examines the ebb and flow of the Quebec government’s economic and commercial relations with the United States in the period 1994–2017. The topic demonstrates the impact of three major forces on Quebec’s economic and commercial ties with the US: (1) the North American Free Trade Agreement (NAFTA) which became operational in 1994 and was fully implemented over a 15-year period; (2) the onerous security policies put in place by the US government in the decade following the horrific events of 11 September 2001; and (3) changing economic circumstances in the United States ranging from robust growth to the worst recession since the Great Depression of the 1930s. The article also indicates that the Quebec government continues to sponsor a wide range of activities in the United States, often more elaborate and extensive than comparable activities pursued by many nation-states with representation in the US. 1 1 Stéphane Paquin, ‘Quebec-U.S. Relations: The Big Picture’, American Review of Canadian Studies 46, no. 2 (2016): 149–61.

Mr. X and the Pacific

2018 ◽  
Author(s):  
Paul J. Heer
Keyword(s):  
Soviet Union ◽  
East Asia ◽  
Vietnam War ◽  
Korean War ◽  
The United States ◽  
The Soviet Union ◽  
The Pacific ◽  
The Us ◽  
The Korean War ◽  
The Impact

This book chronicles and assesses the little-known involvement of US diplomat George F. Kennan—renowned as an expert on the Soviet Union—in US policy toward East Asia, primarily in the early Cold War years. Kennan, with vital assistance from his deputy John Paton Davies, played pivotal roles in effecting the US withdrawal from the Chinese civil war and the redirection of American occupation policy in Japan, and in developing the “defensive perimeter” concept in the western Pacific. His influence, however, faded soon thereafter: he was less successful in warning against US security commitments in Korea and Indochina, and the impact of the Korean War ultimately eclipsed his strategic vision for US policy in East Asia. This was due in large part to Kennan’s inability to reconcile his judgment that the mainland of East Asia was strategically expendable to the United States with his belief that US prestige should not be compromised there. The book examines the subsequent evolution of Kennan’s thinking about East Asian issues—including his role as a prominent critic of US involvement in the Vietnam War—and the legacies of his engagement with the region.

An Interdependence Theory of Wedge Strategies

2020 ◽  
Vol 13 (2) ◽  
pp. 253-286
Author(s):  
Yuxing Huang
Keyword(s):  
Soviet Union ◽  
East Asia ◽  
The United States ◽  
Great Power ◽  
Middle Power ◽  
The Soviet Union ◽  
Interdependence Theory ◽  
The Us ◽  
North Vietnam ◽  
The Impact

Abstract A wedge strategy is a state’s attempt to prevent, break up, or weaken a threatening or blocking alliance. An asymmetric alignment consists of a great power (the alignment leader) and a small/middle power (the weaker ally). So when does the wedge strategy of a great power (a divider) towards a competitive asymmetric alignment work? I propose, based upon the ‘Crawford–Izumikawa debate’, an ‘interdependence theory’ of wedge strategies. In the case of an asymmetric alignment that is symmetrically interdependent, the wedge strategy of a divider that accommodates the weaker ally is most likely to succeed. However, a wedge strategy towards an asymmetric alignment that is asymmetrically interdependent is highly likely to fail. I evaluate the theory based upon four wedge strategies adopted in Cold War Asia through analysing American, Russian, and Chinese archival sources. As asymmetrically interdependent, the US–Japan and US–Taiwan alliances offset the impact of Chinese wedge strategies. Between 1955 and 1965, therefore, neither Chinese accommodation nor Chinese pressure could detach weaker American allies from the United States in East Asia. However, China successfully exploited the symmetric interdependence of the US–Pakistan alliance. Between 1962 and 1965, China’s accommodation of Pakistan prevented Pakistan from being used as an American base for containment purposes. Likewise, the Soviet Union took full advantage of the Sino–Vietnamese alignment’s symmetric interdependence, whereby Soviet aid to North Vietnam caused rifts in Sino–Vietnamese relations that eventually wrecked the Sino–Vietnamese alignment. According to the theory, therefore, given the asymmetric interdependence of the hub-and-spokes system, any Chinese attempts to weaken US-sponsored alliances in East Asia would not be effective.

scholarly journals Scientific Teaching and Active Learning yet to Revolutionize Education in East Asia

2017 ◽  
Vol 2 (4) ◽  
pp. 1
Author(s):  
Justin Fendos
Keyword(s):  
Active Learning ◽  
East Asia ◽  
Skill Training ◽  
The United States ◽  
Assessment Tools ◽  
Scientific Teaching ◽  
Wide Range ◽  
The Us ◽  
The Many ◽  
Scientific Subject

Science education in the United States has undergone a profound shift in emphasis away from lecture-based and knowledge-based approaches towards more hands-on platforms with emphasis on skill training and maximizing feedback. Of central importance in this movement has been the concept of scientific teaching: the idea of treating education like a scientific subject by performing experiments on educational outcomes. In the last two decades, a wealth of research has been conducted using this principle to examine the effectiveness of a wide range of pedagogical techniques. Of the many methods used to deliver class content to students, active learning has emerged as one of the most powerful. Another critical development in scientific teaching has been the realization of a wide range of standardized assessment tools for quantifying various student outcomes. Despite the convincing nature of empirical evidence in favor of the utility of both scientific teaching and active learning, dissemination of these platforms in average teaching practices has been slow, even in the US. This article reviews the many advances and challenges of scientific teaching reform, ending with a brief commentary of reform experiences in the US and how these may impact East Asia in the near future.

The Impact of Monetary and Fiscal Policies on the Stock Market in the United States (U.S); Evidence from Linear ARDL Framework

2020 ◽  
Vol 11 (1) ◽  
pp. 132-132
Author(s):  
Aref Emamian
Keyword(s):  
United States ◽  
Stock Market ◽  
The United States ◽  
Real Effective Exchange Rate ◽  
Annual Data ◽  
Fiscal Policies ◽  
Long Run ◽  
The Us ◽  
Short Run ◽  
The Impact

This study examines the impact of monetary and fiscal policies on the stock market in the United States (US), were used. By employing the method of Autoregressive Distributed Lags (ARDL) developed by Pesaran et al. (2001). Annual data from the Federal Reserve, World Bank, and International Monetary Fund, from 1986 to 2017 pertaining to the American economy, the results show that both policies play a significant role in the stock market. We find a significant positive effect of real Gross Domestic Product and the interest rate on the US stock market in the long run and significant negative relationship effect of Consumer Price Index (CPI) and broad money on the US stock market both in the short run and long run. On the other hand, this study only could support the significant positive impact of tax revenue and significant negative impact of real effective exchange rate on the US stock market in the short run while in the long run are insignificant. Keywords: ARDL, monetary policy, fiscal policy, stock market, United States

scholarly journals Spring Freeze Damage of Pecan Bloom: A Review

Horticulturae ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 82
Author(s):  
Amandeep Kaur ◽  
Louise Ferguson ◽  
Niels Maness ◽  
Becky Carroll ◽  
William Reid ◽  
...  
Keyword(s):  
Tree Height ◽  
The United States ◽  
Reproductive Organs ◽  
Tree Age ◽  
The Us ◽  
Nut Production ◽  
Freeze Damage ◽  
Terminal Buds ◽  
And Function ◽  
The Impact

Pecan is native to the United States. The US is the world’s largest pecan producer with an average yearly production of 250 to 300 million pounds; 80 percent of the world’s supply. Georgia, New Mexico, Texas, Arizona, Oklahoma, California, Louisiana, and Florida are the major US pecan producing states. Pecan trees frequently suffer from spring freeze at bud break and bloom as the buds are quite sensitive to freeze damage. This leads to poor flower and nut production. This review focuses on the impact of spring freeze during bud differentiation and flower development. Spring freeze kills the primary terminal buds, the pecan tree has a second chance for growth and flowering through secondary buds. Unfortunately, secondary buds have less bloom potential than primary buds and nut yield is reduced. Spring freeze damage depends on severity of the freeze, bud growth stage, cultivar type and tree age, tree height and tree vigor. This review discusses the impact of temperature on structure and function of male and female reproductive organs. It also summarizes carbohydrate relations as another factor that may play an important role in spring growth and transition of primary and secondary buds to flowers.

scholarly journals Mining Google and Apple mobility data: temporal anatomy for COVID-19 social distancing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Corentin Cot ◽  
Giacomo Cacciapaglia ◽  
Francesco Sannino
Keyword(s):  
Infection Rate ◽  
The United States ◽  
Strong Decrease ◽  
Social Distancing ◽  
Mobility Data ◽  
Actual Measure ◽  
The Us ◽  
The Impact ◽  
Political Decisions ◽  
Mobility Reduction

AbstractWe employ the Google and Apple mobility data to identify, quantify and classify different degrees of social distancing and characterise their imprint on the first wave of the COVID-19 pandemic in Europe and in the United States. We identify the period of enacted social distancing via Google and Apple data, independently from the political decisions. Our analysis allows us to classify different shades of social distancing measures for the first wave of the pandemic. We observe a strong decrease in the infection rate occurring two to five weeks after the onset of mobility reduction. A universal time scale emerges, after which social distancing shows its impact. We further provide an actual measure of the impact of social distancing for each region, showing that the effect amounts to a reduction by 20–40% in the infection rate in Europe and 30–70% in the US.

GPTs and growth: evidence on the technological adoption of electrical and electronic technologies in the 1920s

2020 ◽  
Author(s):  
Sergio Petralia
Keyword(s):  
The United States ◽  
General Purpose ◽  
Geographical Information ◽  
General Purpose Technologies ◽  
Technological Adoption ◽  
Transformative Potential ◽  
The Us ◽  
The Impact ◽  
Electronic Technologies ◽  
Patenting Activity

Abstract The pervasive diffusion of electricity-related technologies at the beginning of the twentieth century has been studied extensively to understand the transformative potential of general purpose technologies (GPTs). Most of what we know, however, has been investigated in relation to the diffusion of their use. This article provides evidence on the county-level economic impact of the technological adoption of electrical and electronic (E&E) technologies in the 1920s in the United States (US). It focuses on measuring the impact of a GPT on technological adopters, i.e., those who are able to develop, transform, and complement it. It is shown that places with patenting activity in E&E technologies grew faster and paid higher wages than others between 1920 and 1930. This analysis required constructing a novel database identifying detailed geographical information for historical patent documents in the US since 1836, as well as developing a text-mining algorithm to identify E&E patents based on patent descriptions.

A New World Economic order formation

2021 ◽  
pp. 932-950
Author(s):  
Vladislav Vyacheslavovich Emelyanov
Keyword(s):  
Oil And Gas ◽  
World Order ◽  
The United States ◽  
New Order ◽  
The West ◽  
Wide Range ◽  
The World ◽  
The Usa ◽  
World Economic Order ◽  
The Impact

Every few decades, the world order changes due to various geopolitical, economic and other circumstances. For example, as a result of globalization, the world order has undergone significant changes in the last forty years. Globalization has led to the destruction of the postwar world order, as well as to world leadership by the United States and the West. However, in recent decades, as a result of globalization, the U.S. and the West began to cede their leadership to developing countries, so there is now a change in the economic structure of relations in the world system. Today the center of economic growth is in the East, namely in Asia. There are no new superpowers in the world at the moment, but the unipolar world will cease to exist due to the weakening of the U. S. leadership, which will lead to a change in the world order. A new leader, which may replace the U. S., will not have as wide range of advantages as the USA has. Most likely, the essence of the new order will be to unite the largest countries and alliances into blocks, for example, the USA together with the Trans-Pacific Partnership, the EU, etc. The article outlines forecasts of GDP growth rates as well as the global energy outlook; analyzes the LNG market as well as the impact of the pandemic on the global oil and gas market; and lists the characteristics of U. S. geopolitics.

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