Article
Meteorology & Atmospheric Sciences
Qi-Xiang Chen, Xin-Lei Han, Yu Gu, Yuan Yuan, Jonathan H. Jiang, Xue-Bo Yang, Kuo-Nan Liou, He-Ping Tan
Summary: This study comprehensively evaluated eight aerosol optical depth (AOD) products from various satellite instruments against ground-based measurements, finding that MODIS DB products generally outperform DT products and VIIRS shows the best overall performance. MISR tends to underestimate AOD in moderate and high conditions. Regional differences in AOD bias and seasonal variations in stability were observed. Further improvements are needed for extreme conditions such as very fine aerosols and high precipitable water and temperature.
ATMOSPHERIC RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Mohamad Nobakht, Maria Shahgedanova, Kevin White
Summary: This study presented the first inventory of dust emission sources in Central Asia and northwestern China based on MODIS imagery data from 2003 to 2012. It found that dust point sources were unevenly distributed, with the highest frequency occurring in specific regions like the Taklimakan desert and the Aralkum. Dust emissions peaked in different seasons in different regions, such as in spring in China and eastern Kazakhstan, and in summer in Central Asia and western Kazakhstan.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Environmental Sciences
Qiangqiang Xu, Xiaoling Chen, Dipesh Rupakheti, Jiadan Dong, Linling Tang, Shichang Kang
Summary: This study systematically investigated the relationship between satellite AOD and ground-level PM2.5 across China and its 14 representative regions during 2016-2018. The results showed strong correlations between different algorithms of AOD and PM2.5, providing guidance for estimating PM2.5 based on AOD in different regions of China.
Article
Environmental Sciences
N. B. Lakshmi, S. Suresh Babu, Vijayakumar S. Nair
Summary: Mineral dust aerosols over the Himalayas were assessed using 11 years (2006-2018) of polarization-resolved observations from the CALIOP instrument onboard the CALIPSO satellite. The extinction coefficient of dust aerosols was retrieved using the depolarization ratio, revealing significant regional and seasonal variations. Dust loading was highest during the pre-monsoon season (March-May) and lowest during the summer monsoon season (June-September) due to reduced dust transport associated with weak westerlies. About 64-74% of total aerosols over the Himalayas were composed of polluted dust, which is a mixture of dust and anthropogenic aerosols. Dry deposition of dust aerosols caused a substantial reduction in albedo and a radiative forcing of 0.38-23.7 Wm(-2) at the top of the atmosphere, potentially leading to significant warming and reduction in snow cover in the Himalayan cryosphere.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Nivedita Sanwlani, Reshmi Das
Summary: This study derived the mineral composition of airborne dust aerosols using satellite optical measurements and compared it with chemically analyzed elemental concentrations. The results showed a high correlation between the derived mineral concentrations and the elemental concentrations, and the derived mineral concentrations were consistent with other monitoring data.
Article
Meteorology & Atmospheric Sciences
Jaisankar Bharath, Tumuluru Venkata Lakshmi Kumar, Vanda Salgueiro, Maria Joao Costa, Rajesh Kumar Mall
Summary: This study compares the global and regional trends of aerosol optical depth (AOD) from model simulations with satellite retrievals and analyzes the intermodel variations. The study finds that the model simulations overestimate AOD in certain regions and shows differences in simulating aerosol size distribution among different models.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2023)
Article
Engineering, Aerospace
Lijuan Chen, Ren Wang, Geng Wei, Jiamei Han, Yong Zha
Summary: A new method for retrieving MISR AOD data supported by MODIS data in Jiangsu Province, China, is proposed in this study. The accuracy of the MISR AOD retrieval was notably improved after correcting the MISR surface reflectance.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Environmental Sciences
Zainab Arub, Gaurav Singh, Gazala Habib, Ramya Sunder Raman
Summary: The traditional method of estimating hygroscopicity parameter (kappa) underestimates the value for highly polluted cities with mineral dust, while detailed chemical analysis shows a significant increase in kappa. The impact of mineral dust on kappa has crucial implications for Cloud Condensation Nuclei (CCN) estimation and precipitation quantification by Global Climatic models.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Engineering, Multidisciplinary
Ke Gui, Huizheng Che, Lei Li, Yu Zheng, Lei Zhang, Hujia Zhao, Junting Zhong, Wenrui Yao, Yuanxin Liang, Yaqiang Wang, Xiaoye Zhang
Summary: This study investigates the optical and microphysical properties of aerosols over land using data from the Multi-angle Imaging SpectroRadiometer. The results show that small-sized and spherical aerosols composed of sulfate, organic matter, and black carbon play a dominant role in determining the interannual variability in land total aerosol optical depth.
Article
Environmental Sciences
Alaa Mhawish, Meytar Sorek-Hamer, Robert Chatfield, Tirthankar Banerjee, Muhammad Bilal, Manish Kumar, Chandan Sarangi, Meredith Franklin, Khang Chau, Michael Garay, Olga Kalashnikova
Summary: The study found an increasing trend in aerosol loading over South Asia from 2000 to 2019, with the highest aerosol loading observed during the monsoon season. Natural aerosol emissions and local anthropogenic emissions were identified as the main drivers of high AOD during monsoon and pre-monsoon seasons. High humidity during the monsoon season favored the hygroscopic growth of particles, leading to higher AOD values. The high spatial resolutions of MODIS/MAIAC and MISR aerosol products enabled the identification of previously unobserved aerosol hotspots.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Environmental Sciences
Africa Barreto, Emilio Cuevas, Rosa D. Garcia, Judit Carrillo, Joseph M. Prospero, Sara Basart, Alberto J. Berjon, Carlos L. Marrero, Yballa Hernandez, Juan Jose Bustos, Slobodan Nickovic, Margarita Yela, Luka Ilic
Summary: This study investigates the seasonal evolution of atmospheric aerosol extinction and meteorological vertical profiles in Tenerife, Canary Islands over the period 2007-2018. The results reveal different patterns of dust transport and describe the vertical distribution of dust in the Saharan Air Layer (SAL) over this region. The study highlights the important role of both dust and water vapor in the radiative balance within the SAL during summer and winter. Furthermore, the study suggests a potential impact of the SAL on heterogeneous ice nucleation processes.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Haley M. Royer, Mira L. Poehlker, Ovid Krueger, Edmund Blades, Peter Sealy, Nurun Nahar Lata, Zezhen Cheng, Swarup China, Andrew P. Ault, Patricia K. Quinn, Paquita Zuidema, Christopher Poehlker, Ulrich Poeschl, Meinrat Andreae, Cassandra J. Gaston
Summary: By comparing multiple observational campaigns from January to February 2020, this study reveals the importance of African smoke for atmospheric processes and cloud formation over the Caribbean.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Stavros-Andreas Logothetis, Vasileios Salamalikis, Antonis Gkikas, Stelios Kazadzis, Vassilis Amiridis, Andreas Kazantzidis
Summary: This study analyzed global, regional and seasonal dust changes and the impact of dust particles on total aerosol loading using the MIDAS dataset from 2003 to 2017. The research found an increase in dust burden in the central Sahara and Arabian Peninsula, while a decrease in dust levels was observed in the western and eastern Sahara, Bodele Depression, Thar and Gobi deserts, and the Mediterranean Basin.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Ecology
Matthew C. Baddock, Robert G. Bryant, Miguel Dominguez Acosta, Thomas E. Gill
Summary: The study discusses the advancements in dust source research using remote sensing techniques, highlighting the potential of CubeSat constellations with high-temporal-and-spatial-resolution sensors. It emphasizes the improvement in understanding the spatio-temporal characteristics of dust emissions through detailed observations provided by CubeSats.
JOURNAL OF ARID ENVIRONMENTS
(2021)
Article
Environmental Sciences
Amar Deep, Chhavi Pant Pandey, Hemwati Nandan, Narendra Singh, Garima Yadav, P. C. Joshi, K. D. Purohit, S. C. Bhatt
Summary: This article analyzes the aerosol optical depth and Angstrom exponent parameters in the Chamoli and Dehradun regions of Garhwal Himalaya in Uttarakhand, India from 2006 to 2015. The study shows variations in aerosol properties across different seasons and regions, highlighting the significant impact of meteorological dynamics on local aerosols.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Geochemistry & Geophysics
Wenzhao Li, Surya Prakash Tiwari, Hesham Mohamed El-Askary, Mohammed Ali Qurban, Vassilis Amiridis, K. P. ManiKandan, Michael J. Garay, Olga Kalashnikova, Thomas C. Piechota, Daniele C. Struppa
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2020)
Article
Environmental Sciences
Myungje Choi, Stanley P. Sander, Robert J. D. Spurr, Thomas J. Pongetti, Gerard van Harten, Brian J. Drouin, David J. Diner, David Crisp, Annmarie Eldering, Olga V. Kalashnikova, Jonathan H. Jiang, Jason J. Hyon, Dejian Fu
Summary: Characterizing aerosol vertical distribution in the planetary boundary layer using passive remote sensing requires advancements in sensor design and performance evaluation. High spectral resolution, polarimetric measurements, and increased signal to noise ratio have been found to improve the retrieval of key aerosol parameters in the PBL. Current and planned satellite instruments individually may not provide sufficient sensitivity, but joint radiometric and polarimetric measurements with specific resolution and SNR levels can enable the simultaneous retrieval of multiple aerosol parameters in the PBL.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Optics
Chenchong Zhang, William R. Heinson, Michael J. Garay, Olga Kalashnikova, Rajan K. Chakrabarty
Summary: This study investigates the performance of radiance-related reflectance factors and polarization-related factors in different types of carbonaceous aerosols as a function of particle size distribution. The results show different sensitivities of aerosols to changes in particle size and imaginary refractive index. The data suggest that future retrieval algorithms could reliably estimate microphysical properties of absorbing carbonaceous aerosols using the degree of linear polarization data.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Environmental Sciences
Alaa Mhawish, Meytar Sorek-Hamer, Robert Chatfield, Tirthankar Banerjee, Muhammad Bilal, Manish Kumar, Chandan Sarangi, Meredith Franklin, Khang Chau, Michael Garay, Olga Kalashnikova
Summary: The study found an increasing trend in aerosol loading over South Asia from 2000 to 2019, with the highest aerosol loading observed during the monsoon season. Natural aerosol emissions and local anthropogenic emissions were identified as the main drivers of high AOD during monsoon and pre-monsoon seasons. High humidity during the monsoon season favored the hygroscopic growth of particles, leading to higher AOD values. The high spatial resolutions of MODIS/MAIAC and MISR aerosol products enabled the identification of previously unobserved aerosol hotspots.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Environmental Sciences
Khang Chau, Meredith Franklin, Huikyo Lee, Michael Garay, Olga Kalashnikova
Summary: Exposure to PM2.5 air pollution has detrimental health effects and satellite-retrieved AOD can supplement PM2.5 exposure modeling efforts. Regional differences in predictive performance and variable importance were observed in the study on the Persian Gulf area, indicating the need for further research on incorporating spatial and temporal autocorrelations in machine learning models.
Article
Multidisciplinary Sciences
Melanie S. Hammer, Aaron van Donkelaar, Randall V. Martin, Erin E. McDuffie, Alexei Lyapustin, Andrew M. Sayer, N. Christina Hsu, Robert C. Levy, Michael J. Garay, Olga V. Kalashnikova, Ralph A. Kahn
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.
Article
Engineering, Environmental
Aaron van Donkelaar, Melanie S. Hammer, Liam Bindle, Michael Brauer, Jeffery R. Brook, Michael J. Garay, N. Christina Hsu, Olga Kalashnikova, Ralph A. Kahn, Colin Lee, Robert C. Levy, Alexei Lyapustin, Andrew M. Sayer, Randall Martin
Summary: This study developed a methodology for monthly PM2.5 estimates and uncertainties using satellite retrievals, chemical transport modeling, and ground-based measurements. Findings show higher winter PM2.5 concentrations in many densely populated regions, with South Asia and East Asia having particularly high levels, although East Asia showed a decreasing trend in PM2.5 concentrations over the period studied.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Philip G. Brodrick, David R. Thompson, Michael J. Garay, David M. Giles, Brent N. Holben, Olga V. Kalashnikova
Summary: This article introduces and evaluates an approach for simultaneous retrieval of aerosol and surface properties from AVIRIS-C data collected during wildfires. The study shows that retrievals from AVIRIS-C compare favorably with ground-based measurements and emphasizes the importance of collecting spectral information from the full VSWIR spectral range to achieve accurate retrievals.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Proceedings Paper
Remote Sensing
Sarath Gunapala, David Ting, William Johnson, Alexander Soibel, Olga Kalashnikova, Michael Garay, Ashley Davies, Mehmet Ogut, Ashok Sood, John Zeller, Christopher David, Sachidananda Babu, Parminder Ghuman
Summary: Remote sensing and characterization of high temperature targets on the Earth's surface is important for various scientific investigations and applications. However, the research in this area has been hindered by limitations in spatial resolution and detector saturation of satellite sensors. To address this issue, the Jet Propulsion Laboratory and partnering institutions are developing a compact modular high dynamic range multispectral imager.
SENSORS, SYSTEMS, AND NEXT-GENERATION SATELLITES XXVI
(2022)
Article
Environmental Sciences
Sujung Go, Alexei Lyapustin, Gregory L. Schuster, Myungje Choi, Paul Ginoux, Mian Chin, Olga Kalashnikova, Oleg Dubovik, Jhoon Kim, Arlindo da Silva, Brent Holben, Jeffrey S. Reid
Summary: The iron-oxide content of dust in the atmosphere, specifically hematite and goethite, was retrieved using measurements from the EPIC instrument on the DSCOVR satellite and the MAIAC algorithm. Comparisons were made with in situ measurements and published data, showing variations within the expected ranges. The study revealed differences in iron-oxide concentrations in dust particles from different regions, which will be valuable for dust shortwave DRE studies and climate modeling.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Review
Remote Sensing
Graeme Stephens, Olga Kalashnikova, Jake J. Gristey, Peter Pilewskie, David R. Thompson, Xianglei Huang, Matthew Lebsock, Sebastian Schmidt
Summary: This paper introduces the ACCP program by NASA and its measurement objectives to be implemented in the current decade, emphasizing the potential contributions of a VSWIR spectrometer to the program's science objectives. The measurements are expected to enhance the understanding of cloud radiative processes, scene discrimination, aerosol and cloud optical properties, as well as provide additional information such as water phase in clouds and total column water vapor. The paper also highlights areas where research focus is needed for the future.
FRONTIERS IN REMOTE SENSING
(2021)
Article
Meteorology & Atmospheric Sciences
Kirk Knobelspiesse, Amir Ibrahim, Bryan Franz, Sean Bailey, Robert Levy, Ziauddin Ahmad, Joel Gales, Meng Gao, Michael Garay, Samuel Anderson, Olga Kalashnikova
Summary: This paper describes the evaluation of the appropriate level of parameterization for simultaneous aerosol and ocean surface property retrievals using sun glint, identifying four suitable parameters. Studies have shown that multi-angle observations can provide rich information, supporting the simultaneous retrieval of aerosol state and wind speed.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2021)
Article
Environmental Sciences
Yan Yu, Olga Kalashnikova, Michael J. Garay, Huikyo Lee, Myungje Choi, Gregory S. Okin, John E. Yorks, James R. Campbell, Jared Marquis
Summary: The current study investigates the diurnal cycle of dust and dust mixture loading across different regions by analyzing aerosol extinction and typing profiles observed by the CATS lidar aboard the International Space Station. The study identifies significant day-night inconsistency in CATS data quality, and reveals pronounced diurnal variations in dust and dust mixture loading during daytime periods and over terrestrial areas. This study confirms previous findings regarding the diurnal cycle of dust emission in key dust sources and identifies significant seasonal and diurnal variability in dust and dust mixture loading over specific regions.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Proceedings Paper
Engineering, Aerospace
Robert O. Green, Natalie Mahowald, Charlene Ung, David R. Thompson, Lori Bator, Matthew Bennet, Michael Bernas, Natalie Blackway, Christine Bradley, Jeff Cha, Pamela Clark, Roger Clark, Deborah Cloud, Ernesto Diaz, Eyal Ben Dor, Riley Duren, Michael Eastwood, Bethany L. Ehlmann, Lisa Fuentes, Paul Ginoux, Johannes Gross, Yutao He, Olga Kalashnikova, William Kert, Didier Keymeulen, Matt Klimesh, Daniel Ku, Helenann Kwong-Fu, Elliott Liggett, Longlie Li, Sarah Lundeen, Maciej D. Makowski, Alan Mazer, Ron Miller, Pantazis Mouroulis, Bogdan Oaida, Greg S. Okin, Alberto Ortega, Amalaye Oyake, Hung Nguyen, Theresa Pace, Thomas H. Painter, Jack Pempejian, Carlos Perez Garcia-Pando, Thang Pham, Benjamin Phillips, Randy Pollock, Richard Purcell, Vincent Realmuto, Josh Schoolcraft, Amit Sen, Simon Shin, Lucas Shaw, Manny Soriano, Gregg Swayze, Erik Thingvold, Afsheen Vaid, Jason Zan
2020 IEEE AEROSPACE CONFERENCE (AEROCONF 2020)
(2020)
Article
Environmental Sciences
Longlei Li, Natalie M. Mahowald, Ron L. Miller, Carlos Perez Garcia-Pando, Martina Klose, Douglas S. Hamilton, Maria Goncalves Ageitos, Paul Ginoux, Yves Balkanski, Robert O. Green, Olga Kalashnikova, Jasper F. Kok, Vincenzo Obiso, David Paynter, David R. Thompson
Summary: The large uncertainty in the mineral dust direct radiative effect is hindered by the uncertainties in surface soil mineralogical content. Shortwave DRE responds region-specifically depending on mineral speciation and surface albedo. Iron oxides play a disproportionately large impact on climate compared to their small fractional burden in the atmosphere.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)