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Interactive comment on “The polarized sun and sky radiometer SSARA: design, calibration, and application for ground based aerosol remote sensing” by Hans Grob et al
| Content Provider | Semantic Scholar |
|---|---|
| Author | Harten, Gerard Van |
| Copyright Year | 2019 |
| Abstract | cluding the polarimetric band, are capable of performing diffuse sky measurements in addition to direct sun measurements, which are available for all bands. The magnitude and orientation of the diattenuation for the 3 polarimetric channels (0, -45, 90 degree analyzer orientations) are determined in the polarimetric calibration using the partially polarized POLBOX source. Radiative transfer simulations using MYSTIC show that the polarimetric calibration improves the radiometry by∼1% and the degree of linear polarization by ∼2% (relative). Absolute radiometric calibration is performed in the lab using LOA’s radiometrically calibrated SphereX, and on a mountain top using a Langley calibration. An advanced quaternion-based geometric calibration model was developed to derive the instrument pointing from direct sun views throughout the day. Recent modifications to the aerosol retrieval algorithm are described, followed by measurements and retrievals on a clear and a cloudy day during the A-LIFE campaign. On both days, the direct sun AOD matches the AERONET direct sun AOD closely, whereas the almucantar and principal plane retrievals typically overestimate the total AOD by ∼0.1. Separate AOD retrievals for fine and coarse mode show an increase in coarse mode which is linked to lidar measurements of incoming Sahara dust. In addition to AOD, the microphysical parameters of effective radius and real refractive index are retrieved for both size modes and compared to AERONET. The paper is very well written. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.atmos-meas-tech-discuss.net/amt-2019-226/amt-2019-226-RC2-print.pdf |
| Alternate Webpage(s) | https://www.atmos-meas-tech-discuss.net/amt-2019-226/amt-2019-226-RC2.pdf |
| Alternate Webpage(s) | https://www.atmos-meas-tech-discuss.net/amt-2019-226/amt-2019-226-RC1-print.pdf |
| Alternate Webpage(s) | https://www.atmos-meas-tech-discuss.net/amt-2019-226/amt-2019-226-RC1.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
