Ehrlich, André; Bierwirth, Eike; Istomina, Larysa; Wendisch, Manfred (2017): Cloud optical thickness, cloud particle effective radius, and effective snow grain size retrieved from airborne spectral reflectivity measurements on 2012-04-29 (VERDI 2012) over the Beaufort Sea [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.882978, In supplement to: Ehrlich, A et al. (2017): Combined retrieval of Arctic liquid water cloud and surface snow properties using airborne spectral solar remote sensing. Atmospheric Measurement Techniques, 10(9), 3215-3230, https://doi.org/10.5194/amt-10-3215-2017
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Published: 2017-11-14 • DOI registered: 2017-12-14
Source:
Project(s):
Arctic Amplification (AC3)
Funding:
German Research Foundation (DFG), grant/award no. 268020496: TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Coverage:
Median Latitude: 69.794980 * Median Longitude: -134.402914 * South-bound Latitude: 69.053130 * West-bound Longitude: -136.796620 * North-bound Latitude: 70.007510 * East-bound Longitude: -133.445330
Date/Time Start: 2012-04-29T16:54:00 * Date/Time End: 2012-04-29T17:44:59
Event(s):
VERDI_1204290108 * Latitude Start: 68.305630 * Longitude Start: -133.500250 * Latitude End: 68.305610 * Longitude End: -133.500250 * Date/Time Start: 2012-04-29T16:02:00 * Date/Time End: 2012-04-29T21:11:00 * Campaign: VERDI_2012 (P5-179_VERDI_2012) * Basis: POLAR 5 * Method/Device: Aircraft (AC)
Comment:
SMART uses two separte spectrometer to cover the solar spectral range. To overcome differences in the timing of both components, a running mean (5 sec) was applied to the reflectivity time series in the retrieval algorithm. Therefore, cloud optical thickness, cloud particle size and snow grain size are smoothed as well while the reflectivity time series are provided as raw data without running mean.
MODIS cloud products were selected and averaged for an area of 5x5 pixel with the aircraft observations centered in this area.
tau_MODIS: MODIS cloud product Collection 6: Cloud Optical Thickness (dimensionless) two-channel retrieval using band 7(2.1 µm) and band 6(1.6 µm) from best points: not failed in any way, not marked for clear sky restoral
tau_MODIS_16: MODIS cloud product Collection 6: Cloud Optical Thickness (dimensionless) two-channel retrieval using band 7(2.1 µm) and either band 1(0.65 µm) , 2(0.86 µm) , or 5(1.2 µm) (specified in Quality_Assurance_1km) from best points: not failed in any way, not marked for clear sky restoral
tau_MODIS_21: MODIS cloud product Collection 6: Cloud Optical Thickness (dimensionless) two-channel retrieval using band 6(1.6 µm) and either band 1(0.65 µm) , 2(0.86 µm) , or 5(1.2 µm) (specified in Quality_Assurance_1km) from best points: not failed in any way, not marked for clear sky restoral
tau_MODIS_37: MODIS cloud product Collection 6: Cloud Optical Thickness (dimensionless) two-channel retrieval using band 20(3.7 µm) and either band 1(0.65 µm) , 2(0.86 µm) , or 5(1.2 µm) (specified in Quality_Assurance_1km) from best points: not failed in any way, not marked for clear sky restoral
R_eff_MODIS: MODIS cloud product Collection 6: Cloud Particle Effective Radius ( µm) two-channel retrieval using band 7(2.1 µm) and band 6(1.6 µm) from best points: not failed in any way, not marked for clear sky restoral
R_eff_MODIS_16: MODIS cloud product Collection 6: Cloud Particle Effective Radius ( µm) two-channel retrieval using band 7(2.1 µm) and either band 1(0.65 µm) , 2(0.86 µm) , or 5(1.2 µm) (specified in Quality_Assurance_1km) from best points: not failed in any way, not marked for clear sky restoral
R_eff_MODIS_21: MODIS cloud product Collection 6: Cloud Particle Effective Radius ( µm) two-channel retrieval using band 6(1.6 µm) and either band 1(0.65 µm) , 2(0.86 µm) , or 5(1.2 µm) (specified in Quality_Assurance_1km) from best points: not failed in any way, not marked for clear sky restoral
R_eff_MODIS_37: MODIS cloud product Collection 6: Cloud Particle Effective Radius ( µm) two-channel retrieval using band 20(3.7 µm) and either band 1(0.65 µm) , 2(0.86 µm) , or 5(1.2 µm) (specified in Quality_Assurance_1km) from best points: not failed in any way, not marked for clear sky restoral
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** Use of these data requires prior OK from the PIs. The VERDI Data Protocol applies **
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Time in seconds | Time | s | Ehrlich, André | seconds of day from 00:00UTC | |
| 2 | DATE/TIME | Date/Time | Ehrlich, André | Geocode | ||
| 3 | LATITUDE | Latitude | Ehrlich, André | Geocode | ||
| 4 | LONGITUDE | Longitude | Ehrlich, André | Geocode | ||
| 5 | Height above sea level | Height | m a.s.l. | Ehrlich, André | ||
| 6 | Solar zenith angle | SZA | deg | Ehrlich, André | ||
| 7 | Reflectance | Refl | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | spectral nadir reflectivity at 645 nm | |
| 8 | Reflectance | Refl | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | spectral nadir reflectivity at 860 nm | |
| 9 | Reflectance | Refl | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | spectral nadir reflectivity at 1040 nm | |
| 10 | Reflectance | Refl | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | spectral nadir reflectivity at 1655 nm | |
| 11 | Reflectance | Refl | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | spectral nadir reflectivity at 2100 nm | |
| 12 | Flag | Flag | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | 1=snow surface, 0=open ocean | |
| 13 | Cloud optical thickness | tau | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | median | |
| 14 | Cloud particle radius | Cloud R eff | µm | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | median effective |
| 15 | Snow grain size | Snow grain size | mm | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | median effective |
| 16 | Error | Error | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | Cloud optical thickness | |
| 17 | Error | Error | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | Cloud particle radius | |
| 18 | Error | Error | Ehrlich, André | Spectral modular airborne radiation measurement system (SMART) | Snow grain size | |
| 19 | Cloud optical thickness | tau | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | tau_MODIS | |
| 20 | Cloud optical thickness | tau | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | tau_MODIS 16 | |
| 21 | Cloud optical thickness | tau | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | tau_MODIS 21 | |
| 22 | Cloud optical thickness | tau | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | tau_MODIS 37 | |
| 23 | Cloud particle radius | Cloud R eff | µm | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | R_eff MODIS |
| 24 | Cloud particle radius | Cloud R eff | µm | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | R_eff MODIS 16 |
| 25 | Cloud particle radius | Cloud R eff | µm | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | R_eff MODIS 21 |
| 26 | Cloud particle radius | Cloud R eff | µm | Ehrlich, André | Moderate-resolution imaging spectroradiometer (MODIS) | R_eff MODIS 37 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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