Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations

The vertical profiles of the optical properties, effective radius of ice crystals and ice water content (IWC) in Arctic semi-transparent stratiform clouds were assessed using quantitative ground-based lidar measurements performed from 13 to 26 May 2016 in Hammerfest (north of Norway, 70° 39′ 48″ Nor...

Full description

Bibliographic Details
Main Authors: Chazette, Patrick, Raut, Jean-Christophe
Format: Text
Language:English
Published: 2023
Subjects:
Online Access:https://doi.org/10.5194/amt-2023-122
https://amt.copernicus.org/preprints/amt-2023-122/
id ftcopernicus:oai:publications.copernicus.org:amtd112195
record_format openpolar
spelling ftcopernicus:oai:publications.copernicus.org:amtd112195 2023-07-30T04:01:05+02:00 Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations Chazette, Patrick Raut, Jean-Christophe 2023-07-07 application/pdf https://doi.org/10.5194/amt-2023-122 https://amt.copernicus.org/preprints/amt-2023-122/ eng eng doi:10.5194/amt-2023-122 https://amt.copernicus.org/preprints/amt-2023-122/ eISSN: 1867-8548 Text 2023 ftcopernicus https://doi.org/10.5194/amt-2023-122 2023-07-10T16:24:17Z The vertical profiles of the optical properties, effective radius of ice crystals and ice water content (IWC) in Arctic semi-transparent stratiform clouds were assessed using quantitative ground-based lidar measurements performed from 13 to 26 May 2016 in Hammerfest (north of Norway, 70° 39′ 48″ North, 23° 41′ 00″ East). The field campaign was part of the Pollution in the ARCtic System (PARCS) project of the French Arctic Initiative. The presence of low-level semi-transparent stratus clouds was noted on 16 and 17 May, and they were sampled continuously by a ground-based Raman-N 2 lidar emitting at the wavelength of 355 nm. These clouds were located just above the atmospheric boundary layer where the 0 °C isotherm reached around 800 m above the mean sea level (a.m.s.l.). To ensure the best penetration of the laser beam into the cloud, we selected case studies with cloud optical thickness (COT). Lidar-derived multiple scattering coefficients were found to be close to 1 and ice crystal depolarization around 10 %, suggesting that ice crystals were small and had a rather spherical shape. This agrees with our Mie computations determining effective radii between ~5 and 20 µm in the clouds for ice water contents between 1 and 8 mg m -3 , respectively. Direct estimate of the microphysical parameters of ice clouds via lidar measurements is a significant asset for the study of their large-scale radiative impact, while reducing the need for experimental resources. Text Arctic Hammerfest Copernicus Publications: E-Journals Arctic Norway
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description The vertical profiles of the optical properties, effective radius of ice crystals and ice water content (IWC) in Arctic semi-transparent stratiform clouds were assessed using quantitative ground-based lidar measurements performed from 13 to 26 May 2016 in Hammerfest (north of Norway, 70° 39′ 48″ North, 23° 41′ 00″ East). The field campaign was part of the Pollution in the ARCtic System (PARCS) project of the French Arctic Initiative. The presence of low-level semi-transparent stratus clouds was noted on 16 and 17 May, and they were sampled continuously by a ground-based Raman-N 2 lidar emitting at the wavelength of 355 nm. These clouds were located just above the atmospheric boundary layer where the 0 °C isotherm reached around 800 m above the mean sea level (a.m.s.l.). To ensure the best penetration of the laser beam into the cloud, we selected case studies with cloud optical thickness (COT). Lidar-derived multiple scattering coefficients were found to be close to 1 and ice crystal depolarization around 10 %, suggesting that ice crystals were small and had a rather spherical shape. This agrees with our Mie computations determining effective radii between ~5 and 20 µm in the clouds for ice water contents between 1 and 8 mg m -3 , respectively. Direct estimate of the microphysical parameters of ice clouds via lidar measurements is a significant asset for the study of their large-scale radiative impact, while reducing the need for experimental resources.
format Text
author Chazette, Patrick
Raut, Jean-Christophe
spellingShingle Chazette, Patrick
Raut, Jean-Christophe
Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations
author_facet Chazette, Patrick
Raut, Jean-Christophe
author_sort Chazette, Patrick
title Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations
title_short Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations
title_full Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations
title_fullStr Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations
title_full_unstemmed Optical and microphysical properties of ice crystals in Arctic clouds from lidar observations
title_sort optical and microphysical properties of ice crystals in arctic clouds from lidar observations
publishDate 2023
url https://doi.org/10.5194/amt-2023-122
https://amt.copernicus.org/preprints/amt-2023-122/
geographic Arctic
Norway
geographic_facet Arctic
Norway
genre Arctic
Hammerfest
genre_facet Arctic
Hammerfest
op_source eISSN: 1867-8548
op_relation doi:10.5194/amt-2023-122
https://amt.copernicus.org/preprints/amt-2023-122/
op_doi https://doi.org/10.5194/amt-2023-122
_version_ 1772811833135071232