Climatology of clouds containing supercooled liquid in the Western and Central Arctic

Garfias, Pablo Saavedra; Kalesse-Los, Heike; Schimmel, Willi

doi:10.1002/essoar.10509918.1

Cited by 3 publications

(2 citation statements)

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“…• Results are consistent with previous findings regarding the effect of low sea ice concentration (e.g., due to the presence of leads or polynyas) on cloud micro-and macro-physical properties [8].…”

Section: -Conclusionsupporting

confidence: 90%

Climatology of mixed-phase clouds and their radiative effects when coupled to sea ice; study based from observations at the western Arctic

Garfias

Kalesse²,

Ebell

2023

Preprint

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The current contribution presents wintertime climatology from 2012 to 2020 of mixed-phase clouds and their radiative effects when coupled to the sea ice states. Measurements from the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) at the North Slope Alaska (NSA) site in Utqiagvik, Alaska are being analyzed. Classification of cloud hydrometeors in the liquid, ice or mixed-phase states was primary determined by the Cloudnet algorithm, developed by the Finish Meteorological Institute, and applied to a set of ground-based remote sensing instruments from NSA . To evaluate the influence by sea ice, which plays an important role on the Arctic surface-atmosphere interaction, the statistics are separated into cases when clouds are coupled or decoupled to specific sea ice conditions, like presence of leads or polynyas in the vicinity of NSA . We found that clouds coupled to sea ice with presence of leads have shown distinguished features like the increase of total liquid content, lower cloud base heights and less ice content when compared to decoupled cases. Nevertheless, these results rely on Cloudnet accurately detecting cloud droplets within mixed-phase clouds. Arctic cloud radiative effects (CRE) have already been studied from short expeditions like the SHEBA campaign (Shupe et al., 2004) and middle-term ground observations in Barrow (Shupe et al., 2015) and Ny-Ålesund, Svalbard (Ebell et al., 2020). We extend similar CRE studies for 8 years during wintertime, where longwave up- and down-welling flux measurements from NSA are used to estimate surface net fuxes and other cloud radiative features for cases when clouds are coupled or decoupled to sea ice conditions and their sensitivity to different gradients of air-surface temperature when leads or polynyas are present.

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Section: -Conclusionsupporting

confidence: 90%

Climatology of mixed-phase clouds and their radiative effects when coupled to sea ice; study based from observations at the western Arctic

Garfias

Kalesse²,

Ebell

2023

Preprint

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“…• Confirmation that coupled clouds are mainly low level clouds (similar for Utiqia ǵvik, Alaska [6]),…”

Section: -Conclusionmentioning

confidence: 78%

Cloud Macro-and Microphysical Properties as Coupled to Sea Ice Leads During the MOSAiC Expedition

Garfias

Kalesse

Albedyll

et al. 2023

Preprint

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This study presents the micro- and macrophysical cloud properties as a function of their surface coupling state with the sea ice during the wintertime of the MOSAiC field experiment. Cloud properties such as cloud base height, liquid- and ice water content have been previously found to have statistically distinguished features under the presence of sea ice leads (characterized by sea ice concentration, SIC) along downwind direction from the central observatory RV Polarstern. Those findings are mainly in an increase of liquid water content, and favored occurrence of low level clouds as contrasted to situations when the clouds are thermodynamically decoupled. The present contribution is an update considering two recent developments in the liquid detection in clouds and in the detection of sea ice leads. First, radar and lidar-based cloud droplet detection approaches like Cloudnet (Illingworth et al. 2007, Tukiainen et al. 2020) using Arctic wintertime observations and applied to measurements by the Atmospheric Radiation Measurement mobile facility (ARM) instrumental suite on-board the RV Polarstern during MOSAiC. Secondly, we explore a new sea ice lead fraction product based on sea ice divergence. Sea ice divergence is estimated from sequential images of space-borne synthetic aperture radar with a spatial resolution of 700 m. The lead divergence product, being independent of cloud coverage, offers the unique advantage to detect opening leads at high spatial resolution. Statistics for the wintertime cloud properties based on the coupling state with the sea ice concentration and sea ice lead fraction will be presented as an approach to study Arctic clouds and their interaction with sea ice.

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Estimation of wintertime cloud radiative effects in the Western Arctic, a function of cloud-moisture-coupling and sea ice conditions

Garfias,

Kalesse-Los,

Ebell

2024

Radiation Processes in the Atmosphere and Ocean

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Climatology of clouds containing supercooled liquid in the Western and Central Arctic

Cited by 3 publications

References 0 publications

Climatology of mixed-phase clouds and their radiative effects when coupled to sea ice; study based from observations at the western Arctic

Climatology of mixed-phase clouds and their radiative effects when coupled to sea ice; study based from observations at the western Arctic

Cloud Macro-and Microphysical Properties as Coupled to Sea Ice Leads During the MOSAiC Expedition

Estimation of wintertime cloud radiative effects in the Western Arctic, a function of cloud-moisture-coupling and sea ice conditions

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