SGP Cloud and Land Surface Interaction Campaign (CLASIC): Measurement Platforms

Miller, M. A.; Avissar, Roni; Berg, LK; Edgerton, SA; Jackson, T.; Kustas, B.; Lamb, P.J.; McFarquhar, Greg M.; Min, Qilong; Schmid, Baptiste; Torn, M. S.; Tuner, DD

doi:10.2172/948002

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…In this study we will use data from the Cirrus Regional Study of Tropical Anvils and Cirrus Layers ‐ Florida Area Cirrus Experiment (CRYSTAL‐FACE), the 2002 Terra‐Aqua experiment (TX‐2002), the Observing‐System Research and Predictability Experiment (THORPEX), the CALIPSO‐CloudSat Validation Experiment (CC‐VEX), the Cloud and Land Surface Interaction Campaign (CLASIC), and the Tropical Composition, Cloud and Climate Coupling experiment (TC4). The specific measurement objectives of these different missions were widely varied and include studies of cirrus anvils and their associated convective systems (CRYSTAL‐FACE) [ McGill et al , 2004], validation of numerical weather prediction schemes (THORPEX) [ Zhou et al , 2005], observations of cumulus convection (CLASIC) [ Miller , 2008], and the tropical upper troposphere and tropopause transitional layer (TC4) [ DeSlover et al , 2007], and calibration validation flights for GLAS (GLAS Cal‐Val) [ Hlavka et al , 2005] and CALIPSO (CC‐VEX) [ McGill et al , 2007]. During these campaigns, CPL acquired cirrus cloud measurements at latitudes between 4°N and 52°N and over longitudes from Nova Scotia westward to the Hawaiian Islands.…”

Section: Cpl Measurementsmentioning

confidence: 99%

On the spectral dependence of backscatter from cirrus clouds: Assessing CALIOP's 1064 nm calibration assumptions using cloud physics lidar measurements

Vaughan¹,

Liu²,

McGill³

et al. 2010

J. Geophys. Res.

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[1] Recent space-based lidar missions rely on assumptions about the spectral dependence of the backscatter signals from cirrus clouds to calibrate measurements made at 1064 nm. In particular, the calibration procedure employed by the Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission assumes that the backscatter color ratio, defined as the ratio of particulate backscatter coefficients at 1064 nm and 532 nm, has a value of 1.00, with an expected standard deviation on the order of 0.04. This work assesses the accuracy of this assumption, and its implications for the CALIPSO 1064 nm calibration scheme, using over 400 h of lidar measurements acquired in the northern hemisphere between 2002 and 2007 by the Cloud Physics Lidar (CPL). For the strongly scattering cirrus clouds typically used for CALIPSO calibrations, the uncorrected CPL-derived backscatter color ratio is 0.83 ± 0.19. Accounting for computational biases introduced by the CPL assumption of pristine air in the calibration region yields a best estimate cirrus cloud color ratio of 1.01 ± 0.25.

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Section: Cpl Measurementsmentioning

confidence: 99%

On the spectral dependence of backscatter from cirrus clouds: Assessing CALIOP's 1064 nm calibration assumptions using cloud physics lidar measurements

Vaughan¹,

Liu²,

McGill³

et al. 2010

J. Geophys. Res.

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“…Duke Bell Helicopter, and the ARM Cessna 206. Details of the payloads carried by these aircraft can be found in Miller et al (2007). Scientists associated with both CHAPS and CLASIC have a common interest in understanding observations made from the NASA Satellite A-Train and pooled their airborne resources in a coordinated pattern designed to relate in situ measurements with observations made by the A-Train.…”

Section: Experimental Goalsmentioning

confidence: 99%

Overview of the Cumulus Humilis Aerosol Processing Study

Berg¹,

Berkowitz²,

Ogren³

et al. 2009

Bull. Amer. Meteor. Soc.

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“…For some of these days, the data collection was supported by two large field campaigns, namely the Cloud and Land Surface Interaction Campaign (CLASIC) 9 and Cumulus Humilis Aerosol Processing Study (CHAPS) 10 . We plan to repeat our analysis for a larger dataset (e.g, summers 2007, 2008, 2009), different cloud types and locations.…”

Section: Discussionmentioning

confidence: 99%

“…Aircraft in situ data from the U.S. Department of Energy (DOE) sponsored Cloud and Land Surface Interaction Campaign (CLASIC) 9 and Cumulus Humilis Aerosol Processing Study (CHAPS) 10 are accessible only for June 24, the surface in situ data are provided for the other 12 days. For selected days, we derive column values of SSA and ASP for nearby "in time" clearsky time periods using the MFRSR-derived aerosol optical depth (AOD) and the ratio of the diffuse over direct irradiance, the so-called diffuse-to-direct ratio (DDR).…”

Section: Approachmentioning

confidence: 99%

Retrieval of intensive aerosol properties from MFRSR observations: partly cloudy cases

et al. 2010

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An approach for the obtaining column intensive aerosol properties, namely the single scattering albedo (SSA) and asymmetry parameter (ASP), from the Multi-Filter Rotating Shadowband Radiometer (MFRSR) spectral observations under partly cloudy conditions is described. The approach involves the MFRSR-based aerosol retrieval for clear-sky periods and an interpolation of the retrieved column aerosol properties for cloudy periods. The observed weak diurnal variability of SSA and ASP at the surface and the close association of the surface intensive aerosol properties with their column counterparts form the basis of such interpolation. The approach is evaluated by calculating the corresponding clear-sky total, direct and diffuse fluxes at five wavelengths (415, 500, 615, 673 and 870 nm) and compare them with the observed fluxes. The aerosol properties provided by this approach are applied for (i) an examination of the statistical relationship between spectral (visible range) and broadband values of the total normalized cloud radiative forcing and (ii) an estimation of the fractional sky cover. Data collected during 13 days with single-layer cumulus clouds observed at U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Climate Research Facility (ACRF) Southern Great Plains (SGP) site during summer 2007 are applied to illustrate the performance and application of this approach.

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SGP Cloud and Land Surface Interaction Campaign (CLASIC): Measurement Platforms

Cited by 10 publications

References 11 publications

On the spectral dependence of backscatter from cirrus clouds: Assessing CALIOP's 1064 nm calibration assumptions using cloud physics lidar measurements

On the spectral dependence of backscatter from cirrus clouds: Assessing CALIOP's 1064 nm calibration assumptions using cloud physics lidar measurements

Overview of the Cumulus Humilis Aerosol Processing Study

Retrieval of intensive aerosol properties from MFRSR observations: partly cloudy cases

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