scholarly journals Retrieval of UVB aerosol extinction profiles from the ground-based Langley Mobile Ozone Lidar (LMOL) system

2021 ◽  
Author(s):  
Liqiao Lei ◽  
Timothy A. Berkoff ◽  
Guillaume P. Gronoff ◽  
Jia Su ◽  
Amin R. Nehrir ◽  
...  
Keyword(s):  
New York ◽  
Tropospheric Ozone ◽  
Lower Troposphere ◽  
Aerosol Extinction ◽  
City Region ◽  
The Us ◽  
Lidar Ratio ◽  
Two Parameters ◽  
The Impact ◽  
532 Nm

Abstract. Aerosols emitted from wildfires are becoming one of the main sources of poor air quality in the US mainland. Their extinction in UVB (wavelength range 280–315 nm) is difficult to be retrieved using simple lidar techniques because of the impact of O3 absorption and lacking information of lidar ratio at those wavelengths. The 2018 Long Island Sound Tropospheric Ozone Study (LISTOS) campaign in the New York City region allowed the characterization of lidar ratio for UVB aerosol retrieval. An algorithm for the aerosol extinction retrieval out of the Langley Mobile Ozone Lidar (LMOL) was used in conjunction with the NASA Langley High Altitude Lidar Observatory (HALO) 532 nm aerosol extinction product. This approach requires assuming 2 parameters, the lidar ratio at 292 nm and the Ångström Exponent (AE) between 532 nm and 292 nm. The objective of this work is to determine these two parameters and assess the retrieval error caused by improper assumption of lidar ratio. This work also accomplishes the first know 292 nm aerosol product inter-comparison between HALO and Tropospheric Ozone Lidar Network (TOLNet) ozone lidar. HALO results were compared with the aerosol data retrieved from the 292 nm band from LMOL with different approximations of the lidar ratio and the AE to determine optimal parameters. Using optimized parameters, the LMOL aerosol extinction can be retrieved with a 10 % accuracy up to 3 km. This work highlights the importance of the lidar ratio and AE in the retrieval and validation of 292 nm aerosol profiles obtained from UV-lidar. Errors arise from approaches that utilize a random priori lidar ratio and AE assumption. The lidar ratios at 292 nm determined in this work will also improve our understanding of the UVB optical properties of aerosol in the lower troposphere affected by transported wildfire emission.

scholarly journals Gastrointestinal endoscopy during the coronavirus pandemic in the New York area: results from a multi-institutional survey

2020 ◽  
Vol 08 (12) ◽  
pp. E1865-E1871
Author(s):  
Srihari Mahadev ◽  
Olga C. Aroniadis ◽  
Luis H. Barraza ◽  
Emil Agarunov ◽  
Michael S. Smith ◽  
...  
Keyword(s):  
New York ◽  
Clinical Care ◽  
Patient Characteristics ◽  
Feeding Tube ◽  
Tube Placement ◽  
Peak Time ◽  
City Region ◽  
Peak Period ◽  
Hospital System ◽  
The Impact

Abstract Background and study aims The coronavirus disease 2019 (COVID-19), and measures taken to mitigate its impact, have profoundly affected the clinical care of gastroenterology patients and the work of endoscopy units. We aimed to describe the clinical care delivered by gastroenterologists and the type of procedures performed during the early to peak period of the pandemic. Methods Endoscopy leaders in the New York region were invited to participate in an electronic survey describing operations and clinical service. Surveys were distributed on April 7, 2020 and responses were collected over the following week. A follow-up survey was distributed on April 20, 2020. Participants were asked to report procedure volumes and patient characteristics, as well protocols for staffing and testing for COVID-19. Results Eleven large academic endoscopy units in the New York City region responded to the survey, representing every major hospital system. COVID patients occupied an average of 54.5 % (18 – 84 %) of hospital beds at the time of survey completion, with 14.5 % (2 %-23 %) of COVID patients requiring intensive care. Endoscopy procedure volume and the number of physicians performing procedures declined by 90 % (66 %-98 %) and 84.5 % (50 %-97 %) respectively following introduction of restricted practice. During this period the most common procedures were EGDs (7.9/unit/week; 88 % for bleeding; the remainder for foreign body and feeding tube placement); ERCPs (5/unit/week; for cholangitis in 67 % and obstructive jaundice in 20 %); Colonoscopies (4/unit/week for bleeding in 77 % or colitis in 23 %) and least common were EUS (3/unit/week for tumor biopsies). Of the sites, 44 % performed pre-procedure COVID testing and the proportion of COVID-positive patients undergoing procedures was 4.6 % in the first 2 weeks and up to 19.6 % in the subsequent 2 weeks. The majority of COVID-positive patients undergoing procedures underwent EGD (30.6 % COVID +) and ERCP (10.2 % COVID +). Conclusions COVID-19 has profoundly impacted the operation of endoscopy units in the New York region. Our data show the impact of a restricted emergency practice on endoscopy volumes and the proportion of expected COVID positive cases during the peak time of the pandemic.

The Rise of Managerialism in the US: Whither Worker Control?

2020 ◽  
pp. 193-216
Author(s):  
Mimi Abramovitz ◽  
Jennifer Zelnick
Keyword(s):  
New York ◽  
New York City ◽  
York City ◽  
Human Service ◽  
Service Workers ◽  
Human Service Workers ◽  
Non Profit ◽  
The Us ◽  
Democratic Control ◽  
The Impact

This chapter investigates the impact of managerialism on the work of non-profit human-service workers in New York City, drawing on survey data to paint a portrait of a sector that has been deeply restructured to emulate private-market relations and processes. It uses the Social Structure of Accumulation (SSA) theory to explain the rise of neoliberal austerity and identify five neoliberal strategies designed to dismantle the US welfare state. The chapter also focuses on the impact of privatization, a key neoliberal strategy; shows how privatization has transformed the organization of work in public and non-profit human-service agencies; and details the experience of nearly 3,000 front-line, mostly female, human-service workers in New York City. It argues that austerity and managerialism generate the perfect storm in which austerity cuts resources and managerialism promotes 'doing more with less' through performance and outcome metrics and close management control of the labour-process. Closely analysing practices for resistance, the chapter concludes that in lower-managerial workplaces, workers had fewer problems with autonomy, a greater say in decision making, less work stress, and more sustainable employment, suggesting that democratic control of the workplace is an alternative route to quality, worker engagement, and successful outcomes.

scholarly journals On the impact of future climate change on tropopause folds and tropospheric ozone

2019 ◽  
Vol 19 (22) ◽  
pp. 14387-14401 ◽  
Author(s):  
Dimitris Akritidis ◽  
Andrea Pozzer ◽  
Prodromos Zanis
Keyword(s):  
Atmospheric Chemistry ◽  
Tropospheric Ozone ◽  
Eastern Mediterranean ◽  
Stratospheric Ozone ◽  
Lower Troposphere ◽  
Future Climate Change ◽  
Identification Algorithm ◽  
The Future ◽  
Projected Changes ◽  
The Impact

Abstract. Using a transient simulation for the period 1960–2100 with the state-of-the-art ECHAM5/MESSy Atmospheric Chemistry (EMAC) global model and a tropopause fold identification algorithm, we explore the future projected changes in tropopause folds, stratosphere-to-troposphere transport (STT) of ozone, and tropospheric ozone under the RCP6.0 scenario. Statistically significant changes in tropopause fold frequencies from 1970–1999 to 2070–2099 are identified in both hemispheres, regionally exceeding 3 %, and are associated with the projected changes in the position and intensity of the subtropical jet streams. A strengthening of ozone STT is projected for the future in both hemispheres, with an induced increase in transported stratospheric ozone tracer throughout the whole troposphere, reaching up to 10 nmol mol−1 in the upper troposphere, 8 nmol mol−1 in the middle troposphere, and 3 nmol mol−1 near the surface. Notably, the regions exhibiting the largest changes of ozone STT at 400 hPa coincide with those with the highest fold frequency changes, highlighting the role of the tropopause folding mechanism in STT processes under a changing climate. For both the eastern Mediterranean and Middle East (EMME) and Afghanistan (AFG) regions, which are known as hotspots of fold activity and ozone STT during the summer period, the year-to-year variability of middle-tropospheric ozone with stratospheric origin is largely explained by the short-term variations in ozone at 150 hPa and tropopause fold frequency. Finally, ozone in the lower troposphere is projected to decrease under the RCP6.0 scenario during MAM (March, April, and May) and JJA (June, July, and August) in the Northern Hemisphere and during DJF (December, January, and February) in the Southern Hemisphere, due to the decline of ozone precursor emissions and the enhanced ozone loss from higher water vapour abundances, while in the rest of the troposphere ozone shows a remarkable increase owing mainly to the STT strengthening and the stratospheric ozone recovery.

scholarly journals Violence While in Utero: The Impact of Assaults during Pregnancy on Birth Outcomes

2020 ◽  
pp. 1-46
Author(s):  
Janet Currie ◽  
Michael Mueller-Smith ◽  
Maya Rossin-Slater
Keyword(s):  
New York ◽  
Birth Outcomes ◽  
Infant Health ◽  
In Utero ◽  
Adverse Birth Outcomes ◽  
Disadvantaged Women ◽  
The Us ◽  
Birth Records ◽  
The Impact

We study the effects of prenatal exposure to violent crime on infant health, using New York City crime records linked to mothers' addresses in birth records data. We address endogeneity of assault exposure with three strategies and find that in utero assault exposure significantly increases the incidence of adverse birth outcomes. We calculate that the annual social cost of assault during pregnancy in the US is more than $3.8 billion. Since infant health predicts long-term wellbeing and disadvantaged women are disproportionately likely to be domestic abuse victims, violence in utero may be an important channel for intergenerational transmission of inequality.

Changing Patterns of Corporate Headquarter Influence, 1974–89

1994 ◽  
Vol 26 (5) ◽  
pp. 733-747 ◽  
Author(s):  
D I Lyons
Keyword(s):  
New York ◽  
Metropolitan Region ◽  
Evolutionary Sequence ◽  
Metropolitan Regions ◽  
Corporate Influence ◽  
Us Economy ◽  
The Us ◽  
Changing Patterns ◽  
Regional Centers ◽  
The Impact

Research on the changing geography of metropolitan corporate headquarters (CH) influence has pointed to a decrease in importance for national centers and an increase in the importance of regional centers throughout the country. Theoretical explanations of this change have posited a linear evolutionary sequence from spatial and hierarchical concentration to dispersal. In this paper, the nature of change in metropolitan CH influence between 1974 and 1989 is examined, with a focus on three aspects of this process. First, the detailed sequence of dispersal within types of metropolitan region is explored. Second, the issue of how metropolitan CH influence changes over space is examined. Third, the impact of the recent restructuring of the US economy on metropolitan corporate influence is investigated. The results suggest that the linear evolutionary sequence model needs some modification. The major proportional shifts in CH influence are from New York to a select set of diversified regional centers that may be emerging as national centers in their own right. Dispersion of CH influence is not simply a matter of shifts from one level of the hierarchy to another, rather it is the outcome of a continuous struggle by existing and new corporations in metropolises among and within all levels of the hierarchy to capture new growth opportunities as older opportunities decline. Finally, the impact of restructuring was twofold. Among some metropolitan regions dominated by sectors that declined during the period 1974–89 the consequences were a dramatic decrease in influence. The CHs of the new growth sectors were concentrated among national centers and hence contributed to increased influence at the apex of the hierarchy.

scholarly journals Stratospheric impact on the Northern Hemisphere winter and spring ozone interannual variability in the troposphere

2019 ◽  
Author(s):  
Junhua Liu ◽  
Jose M. Rodriguez ◽  
Luke D. Oman ◽  
Anne R. Douglass ◽  
Mark A. Olsen ◽  
...  
Keyword(s):  
North America ◽  
Tropospheric Ozone ◽  
Interannual Variation ◽  
Stratospheric Ozone ◽  
Lower Troposphere ◽  
The Arctic ◽  
Vertical Extent ◽  
Pinatubo Eruption ◽  
Tropospheric O3 ◽  
The Impact

Abstract. In this study we use O3 and stratospheric O3 tracer simulations from the high-resolution Goddard Earth Observing System, Version 5 (GEOS-5) Replay run (MERRA-2 GMI at 0.5° model resolution ~ 50 km) and observations from ozonesondes to investigate the interannual variation and vertical extent of the stratospheric ozone impact on tropospheric ozone. Our work focuses on the winter and spring seasons over North America and Europe. The model reproduces the observed interannual variation of tropospheric O3, except for the Pinatubo period from 1991 to 1995 over the region of North America. Ozonesonde data show a negative ozone anomaly in 1992–1994 following the Pinatubo eruption, with recovery thereafter. The simulated anomaly is only half the magnitude of that observed. Our analysis suggests that the simulated Stratosphere-troposphere exchange (STE) flux deduced from the analysis might be too strong over the North American (50° N–70° N) region after the Mt. Pinatubo eruption in the early 1990s, masking the impact of lower stratospheric O3 concentration on tropospheric O3. European ozonesonde measurements show a similar but weaker O3 depletion after the Mt. Pinatubo eruption, which is fully reproduced by the model. Analysis based on a stratospheric O3 tracer (StratO3) identifies differences in strength and vertical extent of stratospheric ozone influence on the tropospheric ozone interannual variation (IAV) between North America and Europe. Over North America, the StratO3 IAV has a significant impact on tropospheric O3 from the upper to lower troposphere and explains about 60 % and 66 % of simulated O3 IAV at 400 hPa, ~ 11 % and 34 % at 700 hPa in winter and spring respectively. Over Europe, the influence is limited to the middle to upper troposphere, and becomes much smaller at 700 hPa. The stronger and deeper stratospheric contributions in the tropospheric O3 IAV over North America shown by the model is likely related to ozonesondes' being closer to the polar vortex in winter with lower geopotential height, lower tropopause height, and stronger coupling to the Arctic Oscillation in the lower troposphere (LT) than over Europe.

scholarly journals The impact of Hurricane Maria on out-migration from Puerto Rico: Evidence from Facebook data

2019 ◽  
Author(s):  
Monica Alexander ◽  
Emilio Zagheni ◽  
Kivan Polimis
Keyword(s):  
New York ◽  
Puerto Rico ◽  
Return Migration ◽  
Age Groups ◽  
Population Characteristics ◽  
Population Movements ◽  
Demographic Indicators ◽  
Migration Data ◽  
The Us ◽  
The Impact

Natural disasters such as hurricanes can cause substantial population out-migration. However, the magnitude of population movements is difficult to estimate using only traditional sources of migration data. We utilize data obtained from Facebook's advertising platform to estimate out-migration from Puerto Rico in the months after Hurricane Maria. We find evidence to indicate a 17.0% increase in the number of Puerto Rican migrants present in the US over the period October 2017 to January 2018. States with the biggest increases were Florida, New York and Pennsylvania, and there were disproportionately larger increases in the 15-30 age groups and for men compared to women. Additionally, we find evidence of subsequent return migration to Puerto Rico over the period January 2018 to March 2018. These results illustrate the power of complementing social media and traditional data to monitor demographic indicators over time, particularly after a shock, such as a natural disaster, to understand large changes in population characteristics.

London

2018 ◽  
Author(s):  
Richard Roberts
Keyword(s):  
New York ◽  
Financial Services ◽  
Financial Regulation ◽  
Global Financial Crisis ◽  
Services Sector ◽  
The Us ◽  
The Global Financial Crisis ◽  
The Uk ◽  
The Impact ◽  
The Eu

At the onset of the Global Financial Crisis in 2007 London was one of the two foremost global financial centres, along with New York. London experienced a 12 per cent fall in wholesale financial services jobs in 2008–9, but a recovery got underway in 2010 and London’s wholesale financial services sector staged a wavering advance. But now there were new challenges, in particular the avalanche of financial regulation coming from the UK, the EU, the US and the G20. Fintech engendered new uncertainties. The impact of Brexit was uncertain, but mostly expected to be negative, at least in the short-term. Furthermore, there was growing competition from Asian and other financial centres. Nevertheless, London remained pre-eminent as one of the two largest global concentrations of wholesale financial services activity and at the top of the Global Financial Centres Index.

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