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Evolution and Properties of Biomass Burning Aerosol From Boreal Wildfire Over the North Atlantic Ocean
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Dynamical Drives of Aerosol-Cloud Radiation Interactions Over the North Atlantic Ocean
Objectives • Describe the synoptic evolution of WNAO marine boundary layer (MBL) clouds in winter • Analyze the processes that modify the cloud microphysics and explain aerosol-cloud interactions • Discuss outstanding problems in our understanding of extra-tropical MBL clouds
Three Years of Airborne Observations During NASA ACTIVATE: A Statistical Summary of Chemical, Optical, and Microphysical Aerosol Properties Over the Western North Atlantic Ocean
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Storstrømmen and L. Bistrup Bræ, North Greenland, Protected From Warm Atlantic Ocean Waters
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Meridional Eddy Heat Transport Variability in the Surface Mixed Layer of the Atlantic Ocean
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Impacts of Saharan Mineral Dust on Air‐Sea Interaction over North Atlantic Ocean Using a Fully Coupled Regional Model
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Cloud, Aerosol, and Radiative Properties Over the Western North Atlantic Ocean
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Ice Nucleation by Marine Aerosols Over the North Atlantic Ocean in Late Spring
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Nitrogen fixation rates in the Guinea Dome and the equatorial upwelling regions in the Atlantic Ocean
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Observations of Aerosol, Cloud, Turbulence, and Radiation Properties at the Top of the Marine Boundary Layer over the Eastern North Atlantic Ocean: The ACORES Campaign
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Observations of Aerosol, Cloud, Turbulence, and Radiation Properties at the Top of the Marine Boundary Layer over the Eastern North Atlantic Ocean: The ACORES Campaign
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Cloud, Aerosol, and Radiative Properties Over the Western North Atlantic Ocean
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Madden-Julian Oscillation Mediated Tropical cyclone Statistics over the North Atlantic Ocean Basin
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Aerosol hygroscopicity over the South-East Atlantic Ocean during the biomass burning season: Part I – From the perspective of scattering enhancement
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Retrieval, Inter-Comparison, and Validation of Above-Cloud Aerosol Optical Depth from A-train Sensors
Absorbing aerosols produced from biomass burning and dust outbreaks are often found to overlay lower level cloud decks and pose greater potentials of exerting positive radiative effects (warming) whose magnitude directly depends on the aerosol loading above cloud, optical properties of clouds and aerosols, and cloud fraction. Recent development of a 'color ratio' (CR) algorithm applied to observations made by the Aura/OMI and Aqua/MODIS constitutes a major breakthrough and has provided unprecedented maps of above-cloud aerosol optical depth (ACAOD). The CR technique employs reflectance measurements at TOA in two channels (354 and 388 nm for OMI; 470 and 860 nm for MODIS) to retrieve ACAOD in near-UV and visible regions and aerosol-corrected cloud optical depth, simultaneously. An inter-satellite comparison of ACAOD retrieved from NASA's A-train sensors reveals a good level of agreement between the passive sensors over the homogeneous cloud fields. Direct measurements of ACA such as carried out by the NASA Ames Airborne Tracking Sunphotometer (AATS) and Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research (4STAR) can be of immense help in validating ACA retrievals. We validate the ACA optical depth retrieved using the CR method applied to the MODIS cloudy-sky reflectance against the airborne AATS and 4STAR measurements. A thorough search of the historic AATS-4STAR database collected during different field campaigns revealed five events where biomass burning, dust, and wildfire-emitted aerosols were found to overlay lower level cloud decks observed during SAFARI-2000, ACE-ASIA 2001, and SEAC4RS- 2013, respectively. The co-located satellite-airborne measurements revealed a good agreement (RMSE less than 0.1 for AOD at 500 nm) with most matchups falling within the estimated uncertainties in the MODIS retrievals. An extensive validation of satellite-based ACA retrievals requires equivalent field measurements particularly over the regions where ACA are often observed from satellites, i.e., south-eastern Atlantic Ocean, tropical Atlantic Ocean, northern Arabian Sea, South-East and North-East Asia.