Now showing items 1-20 of 45

    • Advancements in the Aerosol Robotic Network (AERONET) Version 3 database – automated near-real-time quality control algorithm with improved cloud screening for Sun photometer aerosol optical depth (AOD) measurements 

      Giles, David M.; Sinyuk, Alexander; Sorokin, Mikhail G.; Schafer, Joel S.; Smirnov, Alexander; Slutsker, Ilya; Eck, Thomas F.; Holben, Brent N.; Lewis, Jasper R.; Campbell, James R.; Welton, Ellsworth J.; Korkin, Sergey V.; Lyapustin, Alexei I. (Copernicus Publications on behalf of the European Geosciences Union, 2019-01-11)
      The Aerosol Robotic Network (AERONET) has provided highly accurate, ground-truth measurements of the aerosol optical depth (AOD) using Cimel Electronique Sun–sky radiometers for more than 25 years. In Version 2 (V2) of the ...
    • Anthropogenic control over wintertime oxidation of atmospheric pollutants 

      Haskins, J.D.; Lopez‐Hilfiker, F. D.; Lee, B. H.; Shah, V.; Wolfe, G. M.; DiGangi, J.; Fibiger, D.; McDuffie, E. E.; Veres, P.; Schroder, J. C.; Campuzano‐Jost, P.; Day, D. A.; Jimenez, J. L.; Weinheimer, A.; Sparks, T.; Cohen, R. C.; Campos, T.; Sullivan, A.; Guo, H.; Weber, R.; Dibb, J.; Green, J.; Fiddler, M.; Bililign, S.; Jaeglé, L.; Brown, S. S.; Thornton, J. A. (American Geophysical Union, 2019-12-13)
      During winter in the midlatitudes, photochemical oxidation is significantly slower than in summer and the main radical oxidants driving formation of secondary pollutants, such as fine particulate matter and ozone, remain ...
    • Applying the Dark Target aerosol algorithm with Advanced Himawari Imager observations during the KORUS-AQ field campaign 

      Gupta, Pawan; Levy, Robert C.; Mattoo, Shana; Remer, Lorraine A.; Holz, Robert E.; Heidinger, Andrew K. (EGU, 2019-12-11)
      For nearly 2 decades we have been quantitatively observing the Earth's aerosol system from space at one or two times of the day by applying the Dark Target family of algorithms to polar-orbiting satellite sensors, particularly ...
    • Asian and Trans‐Pacific Dust: A Multimodel and Multiremote Sensing Observation Analysis 

      Kim, Dongchul; Chin, Mian; Yu, Hongbin; Pan, Xiaohua; Bian, Huisheng; Tan, Qian; Kahn, Ralph A.; Tsigaridis, Kostas; Bauer, Susanne E.; Takemura, Toshihiko; Pozzoli, Luca; Bellouin, Nicolas; Schulz, Michael (American Geophysical Union, 2019-12-06)
      Dust is one of the dominant aerosol types over Asia and the North Pacific Ocean, but quantitative estimation of dust distribution and its contribution to the total regional aerosol load from observations is challenging due ...
    • Assessing NO2 Concentration and Model Uncertainty with High Spatiotemporal Resolution across the Contiguous United States Using Ensemble Model Averaging 

      Di, Qian; Amini, Heresh; Shi, Liuhua; Kloog, Itai; Silvern, Rachel; Kelly, James; Sabath, M. Benjamin; Choirat, Christine; Koutrakis, Petros; Lyapustin, Alexei; Wang, Yujie; Mickley, Loretta J.; Schwartz, Joel (ACS Publications, 2019-12-18)
      NO₂ is a combustion byproduct that has been associated with multiple adverse health outcomes. To assess NO₂ levels with high accuracy, we propose the use of an ensemble model to integrate multiple machine learning algorithms, ...
    • Atmospheric Acetaldehyde: Importance of Air‐Sea Exchange and a Missing Source in the Remote Troposphere 

      Wang, Siyuan; Hornbrook, Rebecca S.; Hills, Alan; Emmons, Louisa K.; Tilmes, Simone; Lamarque, Jean‐François; Jimenez, Jose L.; Campuzano‐Jost, Pedro; Nault, Benjamin A.; Crounse, John D.; Wennberg, Paul O.; Kim, Michelle; Allen, Hannah; Ryerson, Thomas B.; Thompson, Chelsea R.; Peischl, Jeff; Moore, Fred; Nance, David; Hall, Brad; Elkins, James; Tanner, David; Huey, L. Gregory; Hall, Samuel R.; Ullmann, Kirk; Orlando, John J.; Tyndall, Geoff S.; Flocke, Frank M.; Ray, Eric; Hanisco, Thomas F.; Wolfe, Glenn M.; Clair, Jason St.; Commane, Róisín; Daube, Bruce; Barletta, Barbara; Blake, Donald R.; Weinzierl, Bernadett; Dollner, Maximilian; Conley, Andrew; Vitt, Francis; Wofsy, Steven C.; Riemer, Daniel D.; Apel, Eric C. (American Geophysical Union, 2019-05-28)
      Abstract We report airborne measurements of acetaldehyde (CH₃CHO) during the first and second deployments of the National Aeronautics and Space Administration Atmospheric Tomography Mission (ATom). The budget of CH₃CHO ...
    • Atmospheric Correction of Satellite Ocean-Color Imagery During the PACE Era 

      Frouin, Robert J.; Franz, Bryan A.; Ibrahim, Amir; Knobelspiesse, Kirk D.; Ahmad, Ziauddin; Cairns, Brian; Chowdhary, Jacek; Dierssen, Heidi M.; Tan, Jing; Dubovik, Oleg; Huang, Xin; Davis, Anthony B.; Kalashnikova, Olga; Thompson, David R.; Remer, Lorraine Ann; Boss, Emmanuel; Coddington, Odele; Deschamps, Pierre-Yves; Gao, Bo-Cai; Gross, Lydwine; Hasekamp, Otto; Omar, Ali; Pelletier, Bruno; Ramon, Didier; Steinmetz, François; Zhai, Peng-wang (Frontiers, 2019-07-26)
      The Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission will carry into space the Ocean Color Instrument (OCI), a spectrometer measuring at 5 nm spectral resolution in the ultraviolet (UV) to near infrared (NIR) with ...
    • CAFE: a new, improved non-resonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde 

      Clair, Jason M. St.; Swanson, Andrew K.; Bailey, Steven A.; Hanisco, Thomas F. (Copernicus Publications, 2019-08-30)
      NASA Compact Airborne Formaldehyde Experiment (CAFE) is a nonresonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde (HCHO). The instrument is described here with highlighted improvements ...
    • Characterization of smoke and dust episode over West Africa: comparison of MERRA-2 modeling with multiwavelength Mie–Raman lidar observations 

      Veselovskii, Igor; Goloub, Philippe; Podvin, Thierry; Tanre, Didier; da Silva, Arlindo; C (European Geosciences Union, 2018)
      Observations of multiwavelength Mie–Raman lidar taken during the SHADOW field campaign are used to analyze a smoke–dust episode over West Africa on 24–27 December 2015. For the case considered, the dust layer extended from ...
    • Cloud Detection over Snow and Ice with Oxygen A- and B-band Observations from the Earth Polychromatic Imaging Camera (EPIC) 

      Zhou, Yaping; Yang, Yuekui; Gao, Meng; Zhai, Peng-Wang (EGU Publications, 2019-10-21)
      Satellite cloud detection over snow and ice has been difficult for passive remote sensing instruments due to the lack of contrast between clouds and the bright and cold surfaces; cloud mask algorithms often heavily rely ...
    • Comparison of Global and Continental Land Cover Products for Selected Study Areas in South Central and Eastern European Region 

      Manakos, Ioannis; Tomaszewska, Monika; Gkinis, Ioannis; Brovkina, Olga; Filchev, Lachezar; Genc, Levent; Gitas, Ioannis Z.; Halabuk, Andrej; Inalpulat, Melis; Irimescu, Anisoara; Jelev, Georgi; Karantzalos, Konstantinos; Katagis, Thomas; Mesaroš, Minučer; Mihailescu, Denis; Nita, Mihai; Rusnak, Tomas; Stych, Premysl; Zemek, Frantisek; Albrechtová, Jana; Campbell, Petya (MDPI, 2018-12-06)
      Land cover is one of the key terrestrial variables used for monitoring and as input for modelling in support of achieving the United Nations Strategical Development Goals. Global and Continental Land Cover Products (GCLCs) ...
    • Continuing the MODIS Dark Target Aerosol Time Series with VIIRS 

      Sawyer, Virginia; Levy, Robert C.; Mattoo, Shana; Cureton, Geoff; Shi, Yingxi; Remer, Lorraine A. (MDPI, 2020-01-17)
      For reflected sunlight observed from space at visible and near-infrared wavelengths, particles suspended in Earth’s atmosphere provide contrast with vegetation or dark water at the surface. This is the physical motivation ...
    • Development and Evaluation of the Raindrop Size Distribution Parameters for the NASA Global Precipitation Measurement Mission Ground Validation Program 

      Tokay, Ali; D’Adderio, Leo Pio; Wolff, David B.; Petersen, Walter A. (American Meteorological Society, 2019-11-01)
      The National Aeronautics and Space Administration Global Precipitation Measurement (GPM) mission ground validation program uses dual-polarization radar moments to estimate raindrop size distribution (DSD) parameters, the ...
    • Diurnal and Seasonal Variations in Chlorophyll Fluorescence Associated with Photosynthesis at Leaf and Canopy Scales 

      Campbell, Petya K. E.; Huemmrich, Karl F.; Middleton, Elizabeth M.; Ward, Lauren A.; Julitta, Tommaso; Daughtry, Craig S. T.; Burkart, Andreas; Russ, Andrew L.; Kustas, William P. (MDPI, 2019-02-27)
      There is a critical need for sensitive remote sensing approaches to monitor the parameters governing photosynthesis, at the temporal scales relevant to their natural dynamics. The photochemical reflectance index (PRI) and ...
    • Evaluating the impact of spatial resolution on tropospheric NO2 column comparisons within urban areas using high-resolution airborne data 

      Judd, Laura M.; Al-Saadi, Jassim A.; Janz, Scott J.; Kowalewski, Matthew G.; Pierce, R. Bradley; Szykman, James J.; Valin, Lukas C.; Swap, Robert; Cede, Alexander; Mueller, Moritz; Tiefengraber, Martin; Abuhassan, Nader; Williams, David (EGU, 2019-11-22)
      NASA deployed the GeoTASO airborne UV–visible spectrometer in May–June 2017 to produce high-resolution (approximately 250 m×250 m) gapless NO₂ datasets over the western shore of Lake Michigan and over the Los Angeles Basin. ...
    • Evaluation of Terra-MODIS C6 and C6.1 Aerosol Products against Beijing, XiangHe, and Xinglong AERONET Sites in China during 2004-2014 

      Bilal, Muhammad; Nazeer, Majid; Nichol, Janet; Qiu, Zhongfeng; Wang, Lunche; Bleiweiss, Max P.; Shen, Xiaojing; Campbell, James R.; Lolli, Simone (MDPI, 2019-02-27)
      In this study, Terra-MODIS (Moderate Resolution Imaging Spectroradiometer) Collections 6 and 6.1 (C6 & C6.1) aerosol optical depth (AOD) retrievals with the recommended high-quality flag (QF = 3) were retrieved from ...
    • Evaporation From the Southern Ocean Estimatedon the Basis of AIRS Satellite Data 

      Boisvert, Linette; Vihma, Timo; Shie, Chung‐Lin (American Geophysical Union, 2019-12-19)
      Evaporation plays an important role in the global water and energy cycles and, hence, in climate change. Evaporation over the Southern Ocean, where the Antarctic sea ice coverage has a large annual cycle, is poorly quantified. ...
    • Exploring Oxidation in the Remote Free Troposphere: Insights From Atmospheric Tomography (ATom) 

      Brune, W. H.; Miller, D. O.; Thames, A. B.; Allen, H. M.; Apel, E. C.; Blake, D. R.; Bui, T. P.; Commane, R.; Crounse, J. D.; Daube, B. C.; Diskin, G. S.; DiGangi, J. P.; Elkins, J. W.; Hall, S. R.; Hanisco, T. F.; Hannun, R. A.; Hintsa, E. J.; Hornbrook, R. S.; Kim, M. J.; McKain, K.; Moore, F. L.; Neuman, J. A.; Nicely, J. M.; Peischl, J.; Ryerson, T. B.; Clair, J. M. St.; Sweeney, C.; Teng, A. P.; Thompson, C.; Ullmann, K.; Veres, P. R.; Wennberg, P. O.; Wolfe, G. M. (AGU, 2019-12-27)
      Earth's atmosphere oxidizes the greenhouse gas methane and other gases, thus determining their lifetimes and oxidation products. Much of this oxidation occurs in the remote, relatively clean free troposphere above the ...
    • Going Beyond Standard Ocean Color Observations: Lidar and Polarimetry 

      Jamet, Cédric; Ibrahim, Amir; Ahmad, Ziauddin; Angelini, Federico; Babin, Marcel; Behrenfeld, Michael J.; Boss, Emmanuel; Cairns, Brian; Churnside, James; Chowdhary, Jacek; Davis, Anthony B.; Dionisi, Davide; Duforêt-Gaurier, Lucile; Franz, Bryan; Frouin, Robert; Gao, Meng; Gray, Deric; Hasekamp, Otto; He, Xianqiang; Hostetler, Chris; Kalashnikova, Olga V.; Knobelspiesse, Kirk; Lacour, Léo; Loisel, Hubert; Martins, Vanderlei; Rehm, Eric; Remer, Lorraine; Sanhaj, Idriss; Stamnes, Knut; Stamnes, Snorre; Victori, Stéphane; Werdel, Jeremy; Zhai, Peng-Wang (2019-05-21)
      Passive ocean color images have provided a sustained synoptic view of the distribution of ocean optical properties and color and biogeochemical parameters for the past 20-plus years. These images have revolutionized our ...
    • Hybrid Causality Analysis of ENSO’s Global Impacts on Climate Variables Based on Data-Driven Analytics and Climate Model Simulation 

      Song, Hua; Tian, Jing; Huang, Jingfeng; Guo, Pei; Zhang, Zhibo; Wang, Jianwu (Frontiers, 2019-09-18)
      Numerous studies have indicated that El Niño and the southern oscillation (ENSO) could have determinant impacts on remote weather and climate using the conventional correlation-based methods, which however, cannot identify ...