Assessment of uncertainty in cloud radiative effects and heating rates through retrieval algorithm differences: Analysis using 3 years of ARM data at Darwin, Australia
Identifieur interne : 000C64 ( Istex/Curation ); précédent : 000C63; suivant : 000C65Assessment of uncertainty in cloud radiative effects and heating rates through retrieval algorithm differences: Analysis using 3 years of ARM data at Darwin, Australia
Auteurs : Jennifer M. Comstock [États-Unis] ; Alain Protat [Australie] ; Sally A. Mcfarlane [États-Unis] ; Julien Delanoë [France] ; Min Deng [États-Unis]Source :
- Journal of Geophysical Research: Atmospheres [ 2169-897X ] ; 2013-05-27.
English descriptors
- KwdEn :
- Ackerman, Algorithm, Anvil, Appl, Atmos, Backscatter, Black line, Broadband, Cirrus, Cirrus clouds, Closure, Cloud, Cloud detection, Cloud mask, Cloud properties, Cloud radar, Cloud radiative effect, Cloud radiative effects, Cloud retrieval algorithm uncertainty, Cloud retrieval algorithm uncertainty figure, Cloud retrieval algorithm uncertainty table, Combret, Combret varcloud radon rad3mom, Comstock, Darwin, Darwin site, Data points, Delano, Deng, Diameter relationships, Diff, Direct comparisons, Doppler, Doppler moments algorithms, Doppler radar methods, Doppler velocity, Effective radius, Fall speed, Flux diff, Future work, Geophys, Good agreement, Habit assumptions, Heating rate, Heating rate differences, Heating rates, Hexagonal, Hexagonal columns, Hpdfs, Large differences, Larger variance, Lidar, Lidar backscatter, Lidar measurements, Lidar ratio, Lidar subsample, Mace, Matrosov, Meteor, Microphysical, Microphysical properties, Microphysical quantities, Microphysical retrievals, Microphysics, Middle column, National laboratory, Oceanic technol, Optical depth, Optical depths, Other algorithms, Other methods, Particle shape, Particle size, Particle size distribution, Pdfs, Percent difference, Pixel, Primary peak, Protat, Rad3mom, Radar detections, Radar measurements, Radar subsample, Radiative, Radiative effect, Radiative heating rates, Radiative properties, Radiative transfer model, Radiometer, Radon, Rali, Rali algorithms, Rali case, Rali results, Rali subsample, Rali subsamples, Retrieval, Retrieval algorithm, Retrieval algorithms, Right column, Sassen, Sdev, Secondary peak, Shortwave, Skewness, Smaller values, Standard deviation, Statistical relationships, Subsample, Subsamples, Terminal fall speed, Terminal fall velocity, Thin cirrus, Thin clouds, Total number concentration, Trans, Transmittance, Transmittance comparisons, Transmittance diff, Transmittance difference, Tropical clouds, Uxes, Varcloud, Variance, Variance skewness, Vertical distribution, Wang, Water content, Water vapor.
- Teeft :
- Ackerman, Algorithm, Anvil, Appl, Atmos, Backscatter, Black line, Broadband, Cirrus, Cirrus clouds, Closure, Cloud, Cloud detection, Cloud mask, Cloud properties, Cloud radar, Cloud radiative effect, Cloud radiative effects, Cloud retrieval algorithm uncertainty, Cloud retrieval algorithm uncertainty figure, Cloud retrieval algorithm uncertainty table, Combret, Combret varcloud radon rad3mom, Comstock, Darwin, Darwin site, Data points, Delano, Deng, Diameter relationships, Diff, Direct comparisons, Doppler, Doppler moments algorithms, Doppler radar methods, Doppler velocity, Effective radius, Fall speed, Flux diff, Future work, Geophys, Good agreement, Habit assumptions, Heating rate, Heating rate differences, Heating rates, Hexagonal, Hexagonal columns, Hpdfs, Large differences, Larger variance, Lidar, Lidar backscatter, Lidar measurements, Lidar ratio, Lidar subsample, Mace, Matrosov, Meteor, Microphysical, Microphysical properties, Microphysical quantities, Microphysical retrievals, Microphysics, Middle column, National laboratory, Oceanic technol, Optical depth, Optical depths, Other algorithms, Other methods, Particle shape, Particle size, Particle size distribution, Pdfs, Percent difference, Pixel, Primary peak, Protat, Rad3mom, Radar detections, Radar measurements, Radar subsample, Radiative, Radiative effect, Radiative heating rates, Radiative properties, Radiative transfer model, Radiometer, Radon, Rali, Rali algorithms, Rali case, Rali results, Rali subsample, Rali subsamples, Retrieval, Retrieval algorithm, Retrieval algorithms, Right column, Sassen, Sdev, Secondary peak, Shortwave, Skewness, Smaller values, Standard deviation, Statistical relationships, Subsample, Subsamples, Terminal fall speed, Terminal fall velocity, Thin cirrus, Thin clouds, Total number concentration, Trans, Transmittance, Transmittance comparisons, Transmittance diff, Transmittance difference, Tropical clouds, Uxes, Varcloud, Variance, Variance skewness, Vertical distribution, Wang, Water content, Water vapor.
Abstract
Ground‐based radar and lidar observations obtained at the Department of Energy's Atmospheric Radiation Measurement Program's Tropical Western Pacific site located in Darwin, Australia, are used to retrieve ice cloud properties in anvil and cirrus clouds. Cloud microphysical properties derived from four different retrieval algorithms (two radar‐lidar and two radar‐only algorithms) are compared by examining mean profiles and probability density functions of effective radius (Re), ice water content (IWC), visible extinction coefficient, ice number concentration, ice crystal fall speed, and vertical air velocity. Retrieval algorithm uncertainty is quantified using radiative flux closure exercises. The effect of uncertainty in retrieved quantities on the cloud radiative effect and radiative heating rates is presented. Our analysis shows that IWC compares well among algorithms, but Re shows significant discrepancies, which are attributed primarily to assumptions of particle shape. Uncertainty in Re and IWC translates into sometimes large differences in cloud shortwave radiative effect (CRE) though the majority of cases have a CRE difference of roughly 10 W m−2 on average. These differences, which we believe are primarily driven by the uncertainty in Re, can cause up to 2 K/d difference in the radiative heating rates between algorithms.
Url:
DOI: 10.1002/jgrd.50404
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<term>Algorithm</term>
<term>Anvil</term>
<term>Appl</term>
<term>Atmos</term>
<term>Backscatter</term>
<term>Black line</term>
<term>Broadband</term>
<term>Cirrus</term>
<term>Cirrus clouds</term>
<term>Closure</term>
<term>Cloud</term>
<term>Cloud detection</term>
<term>Cloud mask</term>
<term>Cloud properties</term>
<term>Cloud radar</term>
<term>Cloud radiative effect</term>
<term>Cloud radiative effects</term>
<term>Cloud retrieval algorithm uncertainty</term>
<term>Cloud retrieval algorithm uncertainty figure</term>
<term>Cloud retrieval algorithm uncertainty table</term>
<term>Combret</term>
<term>Combret varcloud radon rad3mom</term>
<term>Comstock</term>
<term>Darwin</term>
<term>Darwin site</term>
<term>Data points</term>
<term>Delano</term>
<term>Deng</term>
<term>Diameter relationships</term>
<term>Diff</term>
<term>Direct comparisons</term>
<term>Doppler</term>
<term>Doppler moments algorithms</term>
<term>Doppler radar methods</term>
<term>Doppler velocity</term>
<term>Effective radius</term>
<term>Fall speed</term>
<term>Flux diff</term>
<term>Future work</term>
<term>Geophys</term>
<term>Good agreement</term>
<term>Habit assumptions</term>
<term>Heating rate</term>
<term>Heating rate differences</term>
<term>Heating rates</term>
<term>Hexagonal</term>
<term>Hexagonal columns</term>
<term>Hpdfs</term>
<term>Large differences</term>
<term>Larger variance</term>
<term>Lidar</term>
<term>Lidar backscatter</term>
<term>Lidar measurements</term>
<term>Lidar ratio</term>
<term>Lidar subsample</term>
<term>Mace</term>
<term>Matrosov</term>
<term>Meteor</term>
<term>Microphysical</term>
<term>Microphysical properties</term>
<term>Microphysical quantities</term>
<term>Microphysical retrievals</term>
<term>Microphysics</term>
<term>Middle column</term>
<term>National laboratory</term>
<term>Oceanic technol</term>
<term>Optical depth</term>
<term>Optical depths</term>
<term>Other algorithms</term>
<term>Other methods</term>
<term>Particle shape</term>
<term>Particle size</term>
<term>Particle size distribution</term>
<term>Pdfs</term>
<term>Percent difference</term>
<term>Pixel</term>
<term>Primary peak</term>
<term>Protat</term>
<term>Rad3mom</term>
<term>Radar detections</term>
<term>Radar measurements</term>
<term>Radar subsample</term>
<term>Radiative</term>
<term>Radiative effect</term>
<term>Radiative heating rates</term>
<term>Radiative properties</term>
<term>Radiative transfer model</term>
<term>Radiometer</term>
<term>Radon</term>
<term>Rali</term>
<term>Rali algorithms</term>
<term>Rali case</term>
<term>Rali results</term>
<term>Rali subsample</term>
<term>Rali subsamples</term>
<term>Retrieval</term>
<term>Retrieval algorithm</term>
<term>Retrieval algorithms</term>
<term>Right column</term>
<term>Sassen</term>
<term>Sdev</term>
<term>Secondary peak</term>
<term>Shortwave</term>
<term>Skewness</term>
<term>Smaller values</term>
<term>Standard deviation</term>
<term>Statistical relationships</term>
<term>Subsample</term>
<term>Subsamples</term>
<term>Terminal fall speed</term>
<term>Terminal fall velocity</term>
<term>Thin cirrus</term>
<term>Thin clouds</term>
<term>Total number concentration</term>
<term>Trans</term>
<term>Transmittance</term>
<term>Transmittance comparisons</term>
<term>Transmittance diff</term>
<term>Transmittance difference</term>
<term>Tropical clouds</term>
<term>Uxes</term>
<term>Varcloud</term>
<term>Variance</term>
<term>Variance skewness</term>
<term>Vertical distribution</term>
<term>Wang</term>
<term>Water content</term>
<term>Water vapor</term>
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<keywords scheme="Teeft" xml:lang="en"><term>Ackerman</term>
<term>Algorithm</term>
<term>Anvil</term>
<term>Appl</term>
<term>Atmos</term>
<term>Backscatter</term>
<term>Black line</term>
<term>Broadband</term>
<term>Cirrus</term>
<term>Cirrus clouds</term>
<term>Closure</term>
<term>Cloud</term>
<term>Cloud detection</term>
<term>Cloud mask</term>
<term>Cloud properties</term>
<term>Cloud radar</term>
<term>Cloud radiative effect</term>
<term>Cloud radiative effects</term>
<term>Cloud retrieval algorithm uncertainty</term>
<term>Cloud retrieval algorithm uncertainty figure</term>
<term>Cloud retrieval algorithm uncertainty table</term>
<term>Combret</term>
<term>Combret varcloud radon rad3mom</term>
<term>Comstock</term>
<term>Darwin</term>
<term>Darwin site</term>
<term>Data points</term>
<term>Delano</term>
<term>Deng</term>
<term>Diameter relationships</term>
<term>Diff</term>
<term>Direct comparisons</term>
<term>Doppler</term>
<term>Doppler moments algorithms</term>
<term>Doppler radar methods</term>
<term>Doppler velocity</term>
<term>Effective radius</term>
<term>Fall speed</term>
<term>Flux diff</term>
<term>Future work</term>
<term>Geophys</term>
<term>Good agreement</term>
<term>Habit assumptions</term>
<term>Heating rate</term>
<term>Heating rate differences</term>
<term>Heating rates</term>
<term>Hexagonal</term>
<term>Hexagonal columns</term>
<term>Hpdfs</term>
<term>Large differences</term>
<term>Larger variance</term>
<term>Lidar</term>
<term>Lidar backscatter</term>
<term>Lidar measurements</term>
<term>Lidar ratio</term>
<term>Lidar subsample</term>
<term>Mace</term>
<term>Matrosov</term>
<term>Meteor</term>
<term>Microphysical</term>
<term>Microphysical properties</term>
<term>Microphysical quantities</term>
<term>Microphysical retrievals</term>
<term>Microphysics</term>
<term>Middle column</term>
<term>National laboratory</term>
<term>Oceanic technol</term>
<term>Optical depth</term>
<term>Optical depths</term>
<term>Other algorithms</term>
<term>Other methods</term>
<term>Particle shape</term>
<term>Particle size</term>
<term>Particle size distribution</term>
<term>Pdfs</term>
<term>Percent difference</term>
<term>Pixel</term>
<term>Primary peak</term>
<term>Protat</term>
<term>Rad3mom</term>
<term>Radar detections</term>
<term>Radar measurements</term>
<term>Radar subsample</term>
<term>Radiative</term>
<term>Radiative effect</term>
<term>Radiative heating rates</term>
<term>Radiative properties</term>
<term>Radiative transfer model</term>
<term>Radiometer</term>
<term>Radon</term>
<term>Rali</term>
<term>Rali algorithms</term>
<term>Rali case</term>
<term>Rali results</term>
<term>Rali subsample</term>
<term>Rali subsamples</term>
<term>Retrieval</term>
<term>Retrieval algorithm</term>
<term>Retrieval algorithms</term>
<term>Right column</term>
<term>Sassen</term>
<term>Sdev</term>
<term>Secondary peak</term>
<term>Shortwave</term>
<term>Skewness</term>
<term>Smaller values</term>
<term>Standard deviation</term>
<term>Statistical relationships</term>
<term>Subsample</term>
<term>Subsamples</term>
<term>Terminal fall speed</term>
<term>Terminal fall velocity</term>
<term>Thin cirrus</term>
<term>Thin clouds</term>
<term>Total number concentration</term>
<term>Trans</term>
<term>Transmittance</term>
<term>Transmittance comparisons</term>
<term>Transmittance diff</term>
<term>Transmittance difference</term>
<term>Tropical clouds</term>
<term>Uxes</term>
<term>Varcloud</term>
<term>Variance</term>
<term>Variance skewness</term>
<term>Vertical distribution</term>
<term>Wang</term>
<term>Water content</term>
<term>Water vapor</term>
</keywords>
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<front><div type="abstract">Ground‐based radar and lidar observations obtained at the Department of Energy's Atmospheric Radiation Measurement Program's Tropical Western Pacific site located in Darwin, Australia, are used to retrieve ice cloud properties in anvil and cirrus clouds. Cloud microphysical properties derived from four different retrieval algorithms (two radar‐lidar and two radar‐only algorithms) are compared by examining mean profiles and probability density functions of effective radius (Re), ice water content (IWC), visible extinction coefficient, ice number concentration, ice crystal fall speed, and vertical air velocity. Retrieval algorithm uncertainty is quantified using radiative flux closure exercises. The effect of uncertainty in retrieved quantities on the cloud radiative effect and radiative heating rates is presented. Our analysis shows that IWC compares well among algorithms, but Re shows significant discrepancies, which are attributed primarily to assumptions of particle shape. Uncertainty in Re and IWC translates into sometimes large differences in cloud shortwave radiative effect (CRE) though the majority of cases have a CRE difference of roughly 10 W m−2 on average. These differences, which we believe are primarily driven by the uncertainty in Re, can cause up to 2 K/d difference in the radiative heating rates between algorithms.</div>
</front>
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