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Measurement report: In situ vertical profiles of below-cloud aerosol over the central Greenland Ice Sheet
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Measurement report: In situ vertical profiles of below-cloud aerosol over the central Greenland Ice Sheet
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Measurement report: In situ vertical profiles of below-cloud aerosol over the central Greenland Ice Sheet
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Journal Article
Measurement report: In situ vertical profiles of below-cloud aerosol over the central Greenland Ice Sheet
2024
Overview
Surface radiative cooling in polar regions can generate persistent stability in the atmospheric boundary layer. Stable layers below clouds can decouple the cloud layer from the near-surface environment. Under these conditions, surface aerosol measurements are not necessarily representative of the near-cloud or intra-cloud aerosol populations. To better understand the variability in the vertical structure of aerosol properties over the central Greenland Ice Sheet, in situ measurements of aerosol particle size distributions up to cloud base were made at Summit Station in July and August 2023. These measurements identified distinct vertical aerosol layers between the surface- and cloud-base-associated thermodynamic decoupling layers. Such decoupling layers occur 49 % of the time during the summer in central Greenland, suggesting that surface aerosol measurements are insufficient for describing the cloud-relevant aerosol population half of the time. Experience during this first measurement season demonstrated the ability of a tethered-balloon platform to operate effectively under icing conditions and at low surface pressure (< 680 hPa). The results presented here illustrate the value of vertically resolved in situ measurements of aerosol properties in developing a nuanced understanding of the aerosol effects on cloud properties in polar regions.
