the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Retrieval of microphysical cloud parameters from EM-FTIR spectra measured in Arctic summer 2017
Philipp Richter
Mathias Palm
Christine Weinzierl
Hannes Griesche
Penny M. Rowe
Justus Notholt
Abstract. Infrared spectral radiances of optically thin clouds show high sensitivity to changes of the microphysical cloud parameters. Therefore, measurements of infrared spectral radiance of clouds in the spectral range from 770.9 cm−1 to 1163.4 cm−1 using a mobile Fourier Transform Infrared spectrometer were performed on the German research vessel Polarstern in the Arctic in summer 2017.
A new retrieval for microphysical cloud parameters of optically thin clouds called Total Cloud Water retrieval, designed to retrieve cloud water optical depth τcw, total effective droplet radius rtotal and condensed water path CWP from infrared spectral radiances without the incorporation of spectral radiances in the far-infrared below 600cm−1, has been developed for application on radiances from the measurement campaign. Validation is performed against derived quantities from a combined cloud radar, lidar and microwave radiometer measurement synergy retrieval, called Cloudnet, performed by the Leibnitz Institute for Trospheric Research.
Applied to spectral radiances of synthetic testcases, Total Cloud Water retrieval shows a high ability to retrieve τcw with a correlation of |r| = 0.98, as well as to retrieve CWP with |r| = 0.95 and rtotal with |r| = 0.86. Using the dataset from the campaign, a comparison between CWP from Total Cloud Water retrieval and Cloudnet was performed and showed a correlation of |r| = 0.81. In conclusion, the comparison to artificial clouds and the validation using Cloudnet showed that Total Cloud Water retrieval is able to retrieve the condensed water path from clouds for optically thin clouds and makes it a useful complementation for thin clouds to existing microwave-based measurements.
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Preprint
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Philipp Richter et al.
Interactive discussion


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RC1: 'Review of Richter et al.', Anonymous Referee #1, 18 Sep 2020
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RC2: 'Review of Richter et al.', Quentin Libois, 19 Nov 2020
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RC3: 'Review of Richter et al.', Anonymous Referee #3, 20 Nov 2020
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RC4: 'Review on « Retrieval of microphysical cloud parameters from EM-FTIR spectra measured in ARCTIC summer 2017 » by Richter and co-authors.', Anonymous Referee #4, 30 Nov 2020
Interactive discussion


-
RC1: 'Review of Richter et al.', Anonymous Referee #1, 18 Sep 2020
-
RC2: 'Review of Richter et al.', Quentin Libois, 19 Nov 2020
-
RC3: 'Review of Richter et al.', Anonymous Referee #3, 20 Nov 2020
-
RC4: 'Review on « Retrieval of microphysical cloud parameters from EM-FTIR spectra measured in ARCTIC summer 2017 » by Richter and co-authors.', Anonymous Referee #4, 30 Nov 2020
Philipp Richter et al.
Model code and software
Total Cloud Water retrieval Philipp Richter https://doi.org/10.5281/zenodo.3948047
Philipp Richter et al.
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