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Preprints
https://doi.org/10.5194/acp-2019-1116
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1116
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  29 Jan 2020

29 Jan 2020

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This preprint was under review for the journal ACP but the revision was not accepted.

A 10-year climatology of globally distributed ice cloud properties inferred from the CALIPSO observations

Honglin Pan1, Xinghua Yang1, Kanike Raghavendra Kumar2,3, Ali Mamtimin1, Minzhong Wang1, Chenglong Zhou1, Fan Yang1, Wen Hou1, Chaofan Li4, Jiantao Zhang1, and Lu Meng1 Honglin Pan et al.
  • 1Taklimakan Desert Meteorology Field Experiment Station of CMA, Institute of Desert Meteorology, China Meteorological Administration (CMA), Urumqi 830002, Xinjiang, China
  • 2Department of Physics, School of Sciences and Humanities, Koneru Lakshmaiah Education Foundation, K. L. University, Green Fields, Vaddeswaram 522502, Guntur, Andhra Pradesh, India
  • 3Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, Key Laboratory for Aerosol–Cloud–Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China
  • 4Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, School of Geographic Sciences, Nanjing University of Information Science and Technology,Nanjing 210044, China

Abstract. The present study analyzes the climatology of spatiotemporal and vertical distribution characteristics of ice clouds, including the ice cloud fraction (ICF), ice water content (IWC), and ice cloud optical depth (ICOD) for three ice cloud categories (sub-visual, thin, and opaque). Newly released level 3 ice cloud data observed from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) instrument is used for the period 2007–2016. The results revealed that the global means of ICF and IWC were found to be ~ 10 % and ~ 0.0017 g/m3, respectively. On the other hand, the latitude-and-altitude mean distributions of ICF and IWC were found unimodal in all the seasons. During summer, the peak in the ice cloud formation occurred over the equatorial region of the northern hemisphere (NH) which extended further to higher altitudes over the NH equator than the southern hemisphere (SH). However, the opposite was observed in the cold season. This is mainly related to the strong convective activities in tropical areas, variation in the distribution of land and ocean between NH and SH, and the seasonal migration of the inter-tropical convergence zone (ITCZ). Furthermore, the ice clouds detected during the nighttime in summer occurred at high frequency over the SH high-latitude regions, owing to the polar stratospheric clouds (PSCs). The occurrence of sub-visual ice clouds (ICOD < 0.01) was infrequent in the tropics and below 5 % in other regions. Whereas, the opaque ice clouds (0.3 ≤ ICOD < 1, ICOD ≥ 1) occurred most frequently in mid-latitude storm-active regions. The relationships between IWC and relative humidity (RH) and temperature (TE) suggest negative and positive correlations during the nighttime, respectively. However, the relationship between ICOD and these meteorological variables depends on the range of ICOD.

Honglin Pan et al.

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Honglin Pan et al.

Honglin Pan et al.

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Latest update: 07 Aug 2020
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Short summary
Among several active remote sensors, the CALIPSO instrument can better observe the vertical structure of ice clouds and as well as its diurnal changes. Here, we studied the climatology (2007–2016) of spatiotemporal and vertical distributions characteristics of ice clouds for three ice cloud categories (sub-visual, thin, and opaque) based on the CALIPSO data. The mean profiles of diurnal variability for the ice clouds and relationship with meteorological variables were also investigated.
Among several active remote sensors, the CALIPSO instrument can better observe the vertical...
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