Comparison of aerosol optical depth from four solar radiometers during the fall 1997 ARM intensive observation period

Schmid, Beat; Michalsky, Joseph; Halthore, R. N.; Beauharnois, Mark; Harrison, L.; Livingston, J. M.; Russell, Philip B.; Holben, B. N.; Eck, T. F.; Смирнов, А. И.

doi:10.1029/1999gl900513

Cited by 123 publications

(116 citation statements)

References 9 publications

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“…For example, Kim et al (2005b) and Schmid et al (1999) showed the agreement of the AOD with RMSD values of 0.015 and 0.025, respectively.…”

Section: Comparing With the Results Obtained From Previous Intercompamentioning

confidence: 98%

Ground-Based Mie-Scattering Lidar Measurements of Aerosol Extinction Profiles during ABC-EAREX 2005: Comparisons of Instruments and Inversion Algorithms

Yoon

Kim

et al. 2008

Journal of the Meteorological Society of Japan

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“…For example, Kim et al (2005b) and Schmid et al (1999) showed the agreement of the AOD with RMSD values of 0.015 and 0.025, respectively.…”

Section: Comparing With the Results Obtained From Previous Intercompamentioning

confidence: 98%

Ground-Based Mie-Scattering Lidar Measurements of Aerosol Extinction Profiles during ABC-EAREX 2005: Comparisons of Instruments and Inversion Algorithms

Yoon

Kim

et al. 2008

Journal of the Meteorological Society of Japan

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“…The stations used were the Capo Verde station (16.7 • N, 22.9 • W -for validating retrievals from the city of Espargos on Sal Island), the Grand Forks station (47.9 • N, 97.3 • W -for validating retrievals from light sources near Grand Forks, North Dakota), and the Alta Floresta station (9.9 • S, 56.1 • W -for validating retrievals from the city of Alta Floresta, Brazil). The uncertainty in daytime AERONET τ values is roughly ±0.015 (Schmid et al, 1999;Holben et al, 1998). The cloudscreened level 1.5 AERONET data were used in this study as the level 2 AERONET data are not available for 2012 for the selected AERONET sites.…”

Section: Datasetsmentioning

confidence: 99%

Preliminary investigations toward nighttime aerosol optical depth retrievals from the VIIRS Day/Night Band

Johnson

Zhang

Hyer³

et al. 2013

Atmos. Meas. Tech.

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A great need exists for reliable nighttime aerosol products at high spatial and temporal resolution. In this concept demonstration study, using Visible/Infrared Imager/Radiometer Suite (VIIRS) Day/Night Band (DNB) observations on the Suomi National Polar-orbiting Partnership (NPP) satellite, a new method is proposed for retrieving nighttime aerosol optical depth (τ) using the contrast between regions with and without artificial surface lights. Evaluation of the retrieved τ values against daytime AERONET data from before and after the overpass of the VIIRS satellite over the Cape Verde, Grand Forks, and Alta Floresta AERONET stations yields a coefficient of determination (r²) of 0.71. This study suggests that the VIIRS DNB has the potential to provide useful nighttime aerosol detection and property retrievals

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“…The AERONET program (Holben et al, 1998) is a ground network of sun photometers that provides longterm continuous AOT measurements based on the attenuation of direct solar radiation. These AOT measurements are estimated to have errors of ≈ 0.015 Schmid et al, 1999) and are considered some of the most accurate aerosol observations we have. In this study, we use AERONET AOT which was averaged over 6 h, every 6 h.…”

Section: Observational Data Sets For Model Evaluationmentioning

confidence: 99%

Fire emission heights in the climate system – Part 2: Impact on transport, black carbon concentrations and radiation

et al. 2015

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Abstract. Wildfires represent a major source for aerosols impacting atmospheric radiation, atmospheric chemistry and cloud micro-physical properties. Previous case studies indicated that the height of the aerosol-radiation interaction may crucially affect atmospheric radiation, but the sensitivity to emission heights has been examined with only a few models and is still uncertain. In this study we use the general circulation model ECHAM6 extended by the aerosol module HAM2 to investigate the impact of wildfire emission heights on atmospheric long-range transport, black carbon (BC) concentrations and atmospheric radiation. We simulate the wildfire aerosol release using either various versions of a semiempirical plume height parametrization or prescribed standard emission heights in ECHAM6-HAM2. Extreme scenarios of near-surface or free-tropospheric-only injections provide lower and upper constraints on the emission height climate impact. We find relative changes in mean global atmospheric BC burden of up to 7.9 ± 4.4 % caused by average changes in emission heights of 1.5-3.5 km. Regionally, changes in BC burden exceed 30-40 % in the major biomass burning regions. The model evaluation of aerosol optical thickness (AOT) against Moderate Resolution Imaging Spectroradiometer (MODIS), AErosol RObotic NETwork (AERONET) and Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) observations indicates that the implementation of a plume height parametrization slightly reduces the ECHAM6-HAM2 biases regionally, but on the global scale these improvements in model performance are small. For prescribed emission release at the surface, wildfire emissions entail a total sky top-of-atmosphere (TOA) radiative forcing (RF) of −0.16 ± 0.06 W m −2 . The application of a plume height parametrization which agrees reasonably well with observations introduces a slightly stronger negative TOA RF of −0.20 ± 0.07 W m −2 . The standard ECHAM6-HAM2 model in which 25 % of the wildfire emissions are injected into the free troposphere (FT) and 75 % into the planetary boundary layer (PBL), leads to a TOA RF of −0.24 ± 0.06 W m −2 . Overall, we conclude that simple plume height parametrizations provide sufficient representations of emission heights for global climate modeling. Significant improvements in aerosol wildfire modeling likely depend on better emission inventories and aerosol process modeling rather than on improved emission height parametrizations.

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Comparison of aerosol optical depth from four solar radiometers during the fall 1997 ARM intensive observation period

Cited by 123 publications

References 9 publications

Ground-Based Mie-Scattering Lidar Measurements of Aerosol Extinction Profiles during ABC-EAREX 2005: Comparisons of Instruments and Inversion Algorithms

Ground-Based Mie-Scattering Lidar Measurements of Aerosol Extinction Profiles during ABC-EAREX 2005: Comparisons of Instruments and Inversion Algorithms

Preliminary investigations toward nighttime aerosol optical depth retrievals from the VIIRS Day/Night Band

Fire emission heights in the climate system – Part 2: Impact on transport, black carbon concentrations and radiation

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