Search Results - "Sayer, Andrew M"

Global Estimates and Long-Term Trends of Fine Particulate Matter Concentrations (1998–2018) by Hammer, Melanie S, van Donkelaar, Aaron, Li, Chi, Lyapustin, Alexei, Sayer, Andrew M, Hsu, N. Christina, Levy, Robert C, Garay, Michael J, Kalashnikova, Olga V, Kahn, Ralph A, Brauer, Michael, Apte, Joshua S, Henze, Daven K, Zhang, Li, Zhang, Qiang, Ford, Bonne, Pierce, Jeffrey R, Martin, Randall V

“…Exposure to outdoor fine particulate matter (PM2.5) is a leading risk factor for mortality. We develop global estimates of annual PM2.5 concentrations and…”
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Merging regional and global aerosol optical depth records from major available satellite products by Sogacheva, Larisa, Popp, Thomas, Sayer, Andrew M, Dubovik, Oleg, Garay, Michael J, Heckel, Andreas, Hsu, N. Christina, Jethva, Hiren, Kahn, Ralph A, Kolmonen, Pekka, Kosmale, Miriam, de Leeuw, Gerrit, Levy, Robert C, Litvinov, Pavel, Lyapustin, Alexei, North, Peter, Torres, Omar, Arola, Antti

“…Satellite instruments provide a vantage point for studying aerosol loading consistently over different regions of the world. However, the typical lifetime of a…”
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How Long Is Too Long? Variogram Analysis of AERONET Data to Aid Aerosol Validation and Intercomparison Studies by Sayer, Andrew M.

“…Geophysical data sets derived from satellite sensors, ground/airborne instrumentation, and computational models are often compared against each other. A common…”
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Validation, Stability, and Consistency of MODIS Collection 6.1 and VIIRS Version 1 Deep Blue Aerosol Data Over Land by Sayer, Andrew M., Hsu, N. Christina, Lee, Jaehwa, Kim, Woogyung V., Dutcher, Steven T.

“…The Deep Blue (DB) algorithm has been used to retrieve aerosol optical depth (AOD) and Ångström exponent (AE) over land from multiple satellite instruments,…”
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An AeroCom–AeroSat study: intercomparison of satellite AOD datasets for aerosol model evaluation by Schutgens, Nick, Sayer, Andrew M., Heckel, Andreas, Hsu, Christina, Jethva, Hiren, Leeuw, Gerrit de, Leonard, Peter J. T., Levy, Robert C., Lipponen, Antti, Lyapustin, Alexei, North, Peter, Popp, Thomas, Poulsen, Caroline, Sawyer, Virginia, Sogacheva, Larisa, Thomas, Gareth, Torres, Omar, Wang, Yujie, Kinne, Stefan, Schulz, Michael, Stier, Philip

“…To better understand and characterize current uncertainties in the important observational constraint of climate models of aerosol optical depth (AOD), we…”
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Validation of GRASP algorithm product from POLDER/PARASOL data and assessment of multi-angular polarimetry potential for aerosol monitoring by Chen, Cheng, Dubovik, Oleg, Fuertes, David, Litvinov, Pavel, Lapyonok, Tatyana, Lopatin, Anton, Ducos, Fabrice, Derimian, Yevgeny, Herman, Maurice, Tanré, Didier, Remer, Lorraine A, Lyapustin, Alexei, Sayer, Andrew M, Levy, Robert C, Hsu, N. Christina, Descloitres, Jacques, Li, Lei, Torres, Benjamin, Karol, Yana, Herrera, Milagros, Herreras, Marcos, Aspetsberger, Michael, Wanzenboeck, Moritz, Bindreiter, Lukas, Marth, Daniel, Hangler, Andreas, Federspiel, Christian

“…Proven by multiple theoretical and practical studies, multi-angular spectral polarimetry is ideal for comprehensive retrieval of properties of aerosols…”
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Reducing Aerosol Forcing Uncertainty by Combining Models With Satellite and Within-The-Atmosphere Observations: A Three-Way Street by Kahn, Ralph A., Andrews, Elisabeth, Brock, Charles A., Chin, Mian, Feingold, Graham, Gettelman, Andrew, Levy, Robert C., Murphy, Daniel M., Nenes, Athanasios, Popp, Thomas, Redemann, Jens, Sayer, Andrew M., Silva, Arlindo M. da, Sogacheva, Larisa, Stier, Philip

“…Aerosol forcing uncertainty represents the largest climate forcing uncertainty overall. Its magnitude has remained virtually undiminished over the past 20…”
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Interactions Between Biomass-Burning Aerosols and Clouds over Southeast Asia: Current Status, Challenges, and Perspectives by Lin, Neng-Huei, Sayer, Andrew Mark, Wang, Sheng-Hsiang, Loftus, Adrian M, Hsiao, Ta-Chih, Sheu, Guey-Rong, Hsu, N Christina, Tsay, Si-Chee, Chantara, Somporn

“…The interactions between aerosols, clouds, and precipitation remain among the largest sources of uncertainty in the Earth's energy budget. Biomass-burning…”
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Validation of SOAR VIIRS Over‐Water Aerosol Retrievals and Context Within the Global Satellite Aerosol Data Record by Sayer, Andrew M., Hsu, N. Christina, Lee, Jaehwa, Kim, Woogyung V., Dubovik, Oleg, Dutcher, Steven T., Huang, Dong, Litvinov, Pavel, Lyapustin, Alexei, Tackett, Jason L., Winker, David M.

“…This study validates aerosol properties retrieved using a Satellite Ocean Aerosol Retrieval (SOAR) algorithm applied to Visible Infrared Imaging Radiometer…”
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Anomalous trends in global ocean carbon concentrations following the 2022 eruptions of Hunga Tonga-Hunga Ha'apai by Franz, Bryan A, Cetinić, Ivona, Ibrahim, Amir, Sayer, Andrew M

“…We report on observed trend anomalies in climate-relevant global ocean biogeochemical properties, as derived from satellite ocean color measurements, that show…”
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The CHROMA Cloud-Top Pressure Retrieval Algorithm for the Plankton, Aerosol, Cloud, Ocean Ecosystem (PACE) Satellite Mission by Sayer, Andrew M., Lelli, Luca, Cairns, Brian, Ibrahim, Amir, Knobelspiesse, Kirk D., Korkin, Sergey, Werdell, P. Jeremy

“…This paper provides the theoretical basis and simulated retrievals for the Cloud Height Retrieval from O2 Molecular Absorption (CHROMA) algorithm. Simulations…”
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Satellite observation of pollutant emissions from gas flaring activities near the Arctic by Li, Can, Hsu, N. Christina, Sayer, Andrew M., Krotkov, Nickolay A., Fu, Joshua S., Lamsal, Lok N., Lee, Jaehwa, Tsay, Si-Chee

“…Gas flaring is a common practice in the oil industry that can have significant environmental impacts, but has until recently been largely overlooked in terms…”
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A geometry-dependent surface Lambertian-equivalent reflectivity product for UV–Vis retrievals – Part 2: Evaluation over open ocean by Fasnacht, Zachary, Vasilkov, Alexander, Haffner, David, Qin, Wenhan, Joiner, Joanna, Krotkov, Nickolay, Sayer, Andrew M, Spurr, Robert

“…Satellite-based cloud, aerosol, and trace-gas retrievals from ultraviolet (UV) and visible (Vis) wavelengths depend on the accurate representation of surface…”
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Can Asian dust trigger phytoplankton blooms in the oligotrophic northern South China Sea? by Wang, Sheng-Hsiang, Hsu, N. Christina, Tsay, Si-Chee, Lin, Neng-Huei, Sayer, Andrew M., Huang, Shih-Jen, Lau, William K. M.

“…Satellite data estimate a high dust deposition flux (∼18 g m−2 a−1) into the northern South China Sea (SCS). However, observational evidence concerning any…”
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AERONET‐Based Nonspherical Dust Optical Models and Effects on the VIIRS Deep Blue/SOAR Over Water Aerosol Product by Lee, Jaehwa, Hsu, N. Christina, Sayer, Andrew M., Bettenhausen, Corey, Yang, Ping

“…Aerosol Robotic Network (AERONET)‐based nonspherical dust optical models are developed and applied to the Satellite Ocean Aerosol Retrieval (SOAR) algorithm as…”
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Satellite-Based Spatiotemporal Trends in PM2.5 Concentrations: China, 2004-2013 by Ma, Zongwei, Hu, Xuefei, Sayer, Andrew M, Levy, Robert, Zhang, Qiang, Xue, Yingang, Tong, Shilu, Bi, Jun, Huang, Lei, Liu, Yang

“…Three decades of rapid economic development is causing severe and widespread PM2.5 (particulate matter ≤ 2.5 μm) pollution in China. However, research on the…”
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Monthly Global Estimates of Fine Particulate Matter and Their Uncertainty by van Donkelaar, Aaron, Hammer, Melanie S, Bindle, Liam, Brauer, Michael, Brook, Jeffery R, Garay, Michael J, Hsu, N. Christina, Kalashnikova, Olga V, Kahn, Ralph A, Lee, Colin, Levy, Robert C, Lyapustin, Alexei, Sayer, Andrew M, Martin, Randall V

“…Annual global satellite-based estimates of fine particulate matter (PM2.5) are widely relied upon for air-quality assessment. Here, we develop and apply a…”
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Global Estimates of Fine Particulate Matter using a Combined Geophysical-Statistical Method with Information from Satellites, Models, and Monitors by van Donkelaar, Aaron, Martin, Randall V, Brauer, Michael, Hsu, N. Christina, Kahn, Ralph A, Levy, Robert C, Lyapustin, Alexei, Sayer, Andrew M, Winker, David M

“…We estimated global fine particulate matter (PM2.5) concentrations using information from satellite-, simulation- and monitor-based sources by applying a…”
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Evaluating the Height of Biomass Burning Smoke Aerosols Retrieved from Synergistic Use of Multiple Satellite Sensors over Southeast Asia by Lee, Jaehwa, Hsu, N Christina, Bettenhausen, Corey, Sayer, Andrew M, Seftor, Colin J, Jeong, Myeong-Jae, Tsay, Si-Chee, Welton, Ellsworth J, Wang, Sheng-Hsiang, Chen, Wei-Nai

“…This study evaluates the height of biomass burning smoke aerosols retrieved from a combined use of Visible Infrared Imaging Radiometer Suite (VIIRS), Ozone…”
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Estimating pixel-level uncertainty in ocean color retrievals from MODIS by Zhang, Minwei, Ibrahim, Amir, Franz, Bryan A., Ahmad, Ziauddin, Sayer, Andrew M.

“…The spectral distribution of marine remote sensing reflectance, R(rs), is the fundamental measurement of ocean color science, from which a host of bio-optical…”
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