Markers of economic activity in satellite aerosol optical depth data

Article Environmental Sciences

Unbalanced emission reductions of different species and sectors in Chinaduring COVID-19 lockdown derived by multi-species surface observationassimilation

Lei Kong et al.

Summary: The lockdown measures during the COVID-19 pandemic in China had limited impact on air pollution, and traffic control alone cannot effectively address O-3 and PM2.5 pollution.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2023)

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Article Environmental Sciences

COVID-19 lockdown closures of emissions sources in India: Lessons for air quality and climate policy

Kushal Tibrewal et al.

Summary: During the COVID-19 pandemic, reduced anthropogenic activities in India led to significant decreases in ambient fine particulate matter, SO2, and NOx concentrations, while tropospheric O3 levels spiked. The transport sector, power plants, and industry reduced emissions of CO2, primary PM2.5, SO2, and NOx by approximately 50% to 75%, with minimal reductions in warming SLCFs. The study suggests that reductions in NOx to NMVOC emission ratios spatially coincided with observed increases in O3 levels.

JOURNAL OF ENVIRONMENTAL MANAGEMENT (2022)

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Article Multidisciplinary Sciences

Investigation of June 2020 giant Saharan dust storm using remote sensing observations and model reanalysis

A. Asutosh et al.

Summary: This paper investigates the characteristics and impact of a major Saharan dust storm in June 2020 on atmospheric radiative and thermodynamics properties over the Atlantic Ocean. The study found that the dust storm had the highest aerosol optical depth for June since 2002 and that satellites and models were able to accurately track its origin and spread. The presence of the dust storm resulted in increased atmospheric radiative forcing, leading to elevated warming and decreased relative humidity.

SCIENTIFIC REPORTS (2022)

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Article Meteorology & Atmospheric Sciences

Contribution of Fire Emissions to PM2.5 and Its Transport Mechanism Over the Yungui Plateau, China During 2015-2019

Jun Zhu et al.

Summary: Transport of biomass burning aerosols from Southeast Asia can cause air pollution over the Yungui Plateau in southwestern China. Fire emissions contribute significantly to the vertical PM2.5 concentrations over the Yungui Plateau, with dominant meridional transport. Low pressure weather patterns favor smoke transport, especially the pattern with the lowest pressure and strongest vertical wind disturbance over the northern Yungui Plateau. This study highlights the significant impact of Indo-China Peninsula biomass burning on PM2.5 pollution in southwestern China.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2022)

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Article Economics

Using Synthetic Controls: Feasibility, Data Requirements, and Methodological Aspects

Alberto Abadie

Summary: Synthetic controls are widely used in empirical research in economics and social sciences due to their interpretability and transparency. This article provides practical guidance for researchers, covering an overview, advantages, situations where synthetic controls provide reliable estimates, potential failures, recent extensions, related methods, and future research directions.

JOURNAL OF ECONOMIC LITERATURE (2021)

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Article Geosciences, Multidisciplinary

Dominance of Wildfires Impact on Air Quality Exceedances During the 2020 Record-Breaking Wildfire Season in the United States

Yunyao Li et al.

Summary: The record-breaking wildfire season in the western United States in 2020 had a significant impact on air quality and human health, particularly along the Pacific Coast and Mountain Region. Wildfire emissions were found to be the primary contributor to exceedances, with the most notable impact observed on September 14th.

GEOPHYSICAL RESEARCH LETTERS (2021)

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Article Environmental Sciences

Examining the Economic and Environmental Impacts of COVID-19 Using Earth Observation Data

William Straka et al.

Summary: The global COVID-19 pandemic has led to millions of infections and deaths, with countries implementing various social distancing measures to curb the spread of the virus. Lockdown restrictions have both improved air quality and reduced economic activity, impacting GDP and unemployment rates.

REMOTE SENSING (2021)

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Article Environmental Sciences

Revisiting the levels of Aerosol Optical Depth in south-southeast Asia, Europe and USA amid the COVID-19 pandemic using satellite observations

Prasenjit Acharya et al.

Summary: This study analyzed the impact of global economic shutdown on Aerosol Optical Depth (AOD) and found a significant reduction of AOD in majority areas during the lockdown period. However, clusters of increased AOD were observed in certain regions. Reductions in nitrogen dioxide (NO2) ranged from 20-40%, while sulfur dioxide (SO2) emissions increased up to 30% in most areas. Weekly anomaly showed notable space-time variation.

ENVIRONMENTAL RESEARCH (2021)

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Article Geosciences, Multidisciplinary

The Climate Response to Emissions Reductions Due to COVID-19: Initial Results From CovidMIP

Chris D. Jones et al.

Summary: The models show reduced aerosol amounts in 2020, particularly over southern and eastern Asia, leading to increased surface shortwave radiation levels. However, the impact on near-surface temperature or rainfall during 2020-2024 is extremely small and not detectable in this initial analysis. Further regional analyses and closer attention to extremes are needed to evaluate the impact of COVID-19-related emission reductions on near-term climate.

GEOPHYSICAL RESEARCH LETTERS (2021)

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Article Meteorology & Atmospheric Sciences

Changes in Clear-Sky Shortwave Aerosol Direct Radiative Effects Since 2002

Norman G. Loeb et al.

Summary: The study found that there is no significant trend in ADRE and AOD on a global scale, but ADRE is increasing in the Northern Hemisphere due to emission reductions in China, the United States, and Europe. The COVID-19 shutdown had no noticeable impact on global ADRE or AOD, but had a substantial influence on northeastern China.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2021)

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Article Construction & Building Technology

Surface and satellite observations of air pollution in India during COVID-19 lockdown: Implication to air quality

Yogesh Sathe et al.

Summary: The strict nationwide lockdown in India led to a significant reduction in nitrogen dioxide and fine particulate matter concentrations, which was also supported by satellite observations.

SUSTAINABLE CITIES AND SOCIETY (2021)

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Article Astronomy & Astrophysics

Daily and Hourly Surface PM2.5 Estimation From Satellite AOD

Hai Zhang et al.

Summary: In this study, a geographically weighted regression (GWR) model is used to estimate surface PM2.5 from satellite aerosol optical depth (AOD) dynamically derived in a daily or hourly manner, outperforming the traditional climatological relationships method. The algorithm provides more accurate estimations of daily and hourly PM2.5 over CONUS, with cross validation (CV) R-2 values of 0.59 and 0.44 respectively, and will run in real-time at NOAA to provide air quality community PM2.5 estimates.

EARTH AND SPACE SCIENCE (2021)

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Article Geosciences, Multidisciplinary

Variable Impact of COVID-19 Lockdown on Air Quality across 91 Indian Cities

Ansar Khan et al.

Summary: India implemented a three-phase nationwide lockdown in response to the COVID-19 pandemic, providing a unique opportunity to evaluate the impact of restrictions on air quality in Indian cities. Statistical assessments showed significant decreases in AQI and various pollutants during the lockdown, highlighting the contribution of industrial and transportation sectors to urban pollution.

EARTH INTERACTIONS (2021)

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Article Engineering, Ocean

Tracking Smoke from a Prescribed Fire and Its Impacts on Local Air Quality Using Temporally Resolved GOES-16 ABI Aerosol Optical Depth (AOD)

Amy K. Huff et al.

Summary: The study used AOD data from the GOES-16 satellite to track a smoke plume from a prescribed fire in northeastern Virginia, with ABI AOD data accurately identifying the timing and geographic extent of the plume during daylight hours and showing relative changes in AOD compared to AERONET AOD data. Ground-based PM2.5 measurements and ceilometer aerosol backscatter profiles confirmed deteriorations in air quality coinciding with the smoke transport.

JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY (2021)

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Article Environmental Sciences

Mission-Long Recalibrated Science Quality Suomi NPP VIIRS Radiometric Dataset Using Advanced Algorithms for Time Series Studies

Changyong Cao et al.

Summary: Since its launch on October 28, 2011, the Suomi NPP satellite and its VIIRS instrument have exceeded their design life, providing data for nearly 30 environmental data products, including global imagery and various environmental data. The recalibrated radiance data are now available for users from 2012 to 2020, with improved stability and accuracy.

REMOTE SENSING (2021)

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Article Environmental Sciences

Long-term trends of satellite-based fine-mode aerosol optical depth over the Seto Inland Sea, Japan, over two decades (2001-2020)

Syuichi Itahashi et al.

Summary: This study analyzed the long-term trends of air pollution over the Seto Inland Sea in Japan, showing changes in AOD(f) values from 2001 to 2020, with a decrease especially after 2010. Aerosol pollution from long-range transport from the Asian continent also impacts pollution levels over the SIS. Reductions in aerosol pollution in 2020 can be attributed to the COVID-19 pandemic restrictions on human activity and regulations on SO2 emissions from ships.

ENVIRONMENTAL RESEARCH LETTERS (2021)

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Article Meteorology & Atmospheric Sciences

COVID-19 Induced Fingerprints of a New Normal Urban Air Quality in the United States

S. Kondragunta et al.

Summary: Most countries, including the United States, took actions to control the spread of COVID-19, resulting in a significant decrease in vehicle emissions during lockdown, which correlated well with observed levels of nitrogen dioxide. An increase in unemployment rate led to a decrease in nitrogen dioxide column values. Despite the lifting of lockdown measures, some areas in the US continued to have lower-than-normal emissions.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2021)

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Article Multidisciplinary Sciences

Effects of COVID-19 lockdowns on fine particulate matter concentrations

Melanie S. Hammer et al.

Summary: The study examines the effects of lockdown measures on PM2.5 concentrations during the COVID-19 pandemic, finding significant reductions in China and slight changes in Europe and North America. These changes are attributed to a combination of meteorological conditions and emission reductions, primarily from transportation sources. Regional differences in the sensitivity of PM2.5 to emission sources are demonstrated in this work.

SCIENCE ADVANCES (2021)

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Article Meteorology & Atmospheric Sciences

Assessment of COVID-19 effects on satellite-observed aerosol loading over China with machine learning

Hendrik Andersen et al.

Summary: This study used a machine learning model to estimate aerosol optical depth (AOD) during the lockdown in China, finding no clear decrease in AOD during this period. The comparison between model-expected and observed AOD indicated that meteorological influences actually increased AOD in some regions, highlighting the complexity of aerosol variability and the challenges of attribution.

TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY (2021)

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Review Environmental Sciences

The global impacts of COVID-19 lockdowns on urban air pollution: A critical review and recommendations

Georgios Gkatzelis et al.

Summary: The COVID-19 pandemic led to unprecedented government interventions to limit disease transmission, impacting atmospheric emissions and air quality. Current literature lacks sufficient research on meteorological correction and emission trends, highlighting the need for comprehensive data analysis to predict future pollutant concentrations in the atmosphere.

ELEMENTA-SCIENCE OF THE ANTHROPOCENE (2021)

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Article Environmental Sciences

Impact of Nationwide COVID-19 Lockdown on Indian Air Quality in Terms of Aerosols as Observed from the Space

Manoj K. Mishra et al.

Summary: The study analyzed the impact of lockdown measures on aerosols in India and found a decrease in aerosol optical thickness in most regions, especially in the Indo-Gangetic plain, confirming the positive impact of lockdown on air quality. However, some regions in central, northwest, and northeast India showed an increase in aerosols due to smoke from active fires.

AEROSOL AND AIR QUALITY RESEARCH (2021)

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Article Environmental Sciences

Enhancement of secondary aerosol formation by reduced anthropogenic emissions during Spring Festival 2019 and enlightenment for regional PM2.5 control in Beijing

Yuying Wang et al.

Summary: The field experiment conducted during the 2019 Spring Festival in suburban Beijing revealed that reduced anthropogenic emissions led to changes in aerosol formation and composition, particularly promoting sulfate formation and slightly increasing nitrate formation. The study also emphasized the necessity of controlling O3 formation to reduce secondary pollution in winter under current emission conditions.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2021)

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Article Environmental Sciences

Radiometric consistency between GOES-16 ABI and VIIRS on Suomi NPP and NOAA-20

Sirish Uprety et al.

JOURNAL OF APPLIED REMOTE SENSING (2020)

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Article Multidisciplinary Sciences

COVID-19 lockdowns cause global air pollution declines

Zander S. Venter et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2020)

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Article Multidisciplinary Sciences

Unexpected air pollution with marked emission reductions during the COVID-19 outbreak in China

Tianhao Le et al.

SCIENCE (2020)

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Article Geosciences, Multidisciplinary

Abnormally Shallow Boundary Layer Associated With Severe Air Pollution During the COVID-19 Lockdown in China

Tianning Su et al.

GEOPHYSICAL RESEARCH LETTERS (2020)

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Article Geosciences, Multidisciplinary

Air Quality Response in China Linked to the 2019 Novel Coronavirus (COVID-19) Lockdown

K. Miyazaki et al.

GEOPHYSICAL RESEARCH LETTERS (2020)

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Article Chemistry, Multidisciplinary

The complex chemical effects of COVID-19 shutdowns on air quality

Jesse H. Kroll et al.

NATURE CHEMISTRY (2020)

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Article Environmental Sciences

Significant changes in the chemical compositions and sources of PM2.5 Wuhan since the city lockdown as COVID-19

Huang Zheng et al.

SCIENCE OF THE TOTAL ENVIRONMENT (2020)

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Article Environmental Sciences

COVID-19 and Air Pollution in Indian Cities: World's Most Polluted Cities

Sonal Kumari et al.

AEROSOL AND AIR QUALITY RESEARCH (2020)

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Article Geosciences, Multidisciplinary

A global anthropogenic emission inventory of atmospheric pollutants from sector- and fuel-specific sources (1970-2017): an application of the Community Emissions Data System (CEDS)

Erin E. McDuffie et al.

EARTH SYSTEM SCIENCE DATA (2020)

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Article Meteorology & Atmospheric Sciences

Evaluating Sentinel-5P TROPOMI tropospheric NO2 column densities with airborne and Pandora spectrometers near New York City and Long Island Sound

Laura M. Judd et al.

ATMOSPHERIC MEASUREMENT TECHNIQUES (2020)

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Article Construction & Building Technology

Temporary reduction in fine particulate matter due to 'anthropogenic emissions switch-off' during COVID-19 lockdown in Indian cities

Prashant Kumar et al.

SUSTAINABLE CITIES AND SOCIETY (2020)

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Article Meteorology & Atmospheric Sciences

Comparison of TROPOMI/Sentinel-5 Precursor NO2\ observations with ground-based measurements in Helsinki

Iolanda Ialongo et al.

ATMOSPHERIC MEASUREMENT TECHNIQUES (2020)

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Article Meteorology & Atmospheric Sciences

MAX-DOAS measurements of tropospheric NO2 and HCHO in Munich and the comparison to OMI and TROPOMI satellite observations

Ka Lok Chan et al.

ATMOSPHERIC MEASUREMENT TECHNIQUES (2020)

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Article Meteorology & Atmospheric Sciences

Assessment of the quality of TROPOMI high-spatial-resolution NO2 data products in the Greater Toronto Area

Xiaoyi Zhao et al.

ATMOSPHERIC MEASUREMENT TECHNIQUES (2020)

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Article Environmental Sciences

Impact of COVID-19 Containment Measures on Air Pollution in California

Aaron R. Naeger et al.

AEROSOL AND AIR QUALITY RESEARCH (2020)

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Article Multidisciplinary Sciences

Anthropogenic drivers of 2013-2017 trends in summer surface ozone in China

Ke Li et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2019)

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Article Environmental Sciences

Emission of trace gases and aerosols from biomass burning - an updated assessment

Meinrat O. Andreae

ATMOSPHERIC CHEMISTRY AND PHYSICS (2019)

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Article Environmental Sciences

Spatial and seasonal variations of aerosols over China from two decades of multi-satellite observations - Part 2: AOD time series for 1995-2017 combined from ATSR ADV and MODIS C6.1 and AOD tendency estimations

Larisa Sogacheva et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2018)

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Article Environmental Sciences

Trends in China's anthropogenic emissions since 2010 as the consequence of clean air actions

Bo Zheng et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2018)

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Article Meteorology & Atmospheric Sciences

Impact of Southeast Asian smoke on aerosol properties in Southwest China: First comparison of model simulations with satellite and ground observations

Jun Zhu et al.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2017)

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Article Environmental Sciences

Enhanced hydrophobicity and volatility of submicron aerosols under severe emission control conditions in Beijing

Yuying Wang et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2017)

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Article Environmental Sciences

Insights into aerosol chemistry during the 2015 China Victory Day parade: results from simultaneous measurements at ground level and 260 m in Beijing

Jian Zhao et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2017)

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Article Geosciences, Multidisciplinary

Impact of the 2008 Global Recession on air quality over the United States: Implications for surface ozone levels from changes in NOx emissions

Daniel Tong et al.

GEOPHYSICAL RESEARCH LETTERS (2016)

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Article Meteorology & Atmospheric Sciences

An enhanced VIIRS aerosol optical thickness (AOT) retrieval algorithm over land using a global surface reflectance ratio database

Hai Zhang et al.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2016)

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Article Multidisciplinary Sciences

APEC Blue: Secondary Aerosol Reductions from Emission Controls in Beijing

Yele Sun et al.

SCIENTIFIC REPORTS (2016)

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Article Environmental Sciences

NOx emission estimates during the 2014 Youth Olympic Games in Nanjing

J. Ding et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2015)

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Article Meteorology & Atmospheric Sciences

Preliminary evaluation of S-NPP VIIRS aerosol optical thickness

Hongqing Liu et al.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2014)

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Article Environmental Sciences

Quantitative evaluation of emission controls on primary and secondary organic aerosol sources during Beijing 2008 Olympics

S. Guo et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2013)

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Article Environmental Sciences

Space-based measurements of air quality during the World Expo 2010 in Shanghai

N. Hao et al.

ENVIRONMENTAL RESEARCH LETTERS (2011)

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Article Environmental Sciences

Global satellite analysis of the relation between aerosols and short-lived trace gases

J. P. Veefkind et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2011)

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Article Environmental Sciences

Air quality during the 2008 Beijing Olympics: secondary pollutants and regional impact

T. Wang et al.

ATMOSPHERIC CHEMISTRY AND PHYSICS (2010)

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Article Environmental Sciences

Air pollution holiday effect resulting from the Chinese New Year

Pei-Hua Tan et al.

ATMOSPHERIC ENVIRONMENT (2009)

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Article Geosciences, Multidisciplinary

Satellite observations of changes in air quality during the 2008 Beijing Olympics and Paralympics

J. C. Witte et al.

GEOPHYSICAL RESEARCH LETTERS (2009)

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Article Geosciences, Multidisciplinary

Beijing Olympics as an aerosol field experiment

J. Cermak et al.

GEOPHYSICAL RESEARCH LETTERS (2009)

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Markers of economic activity in satellite aerosol optical depth data

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