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Area of Science:

  • Atmospheric Science
  • Climate Science
  • Arctic Research

Background:

  • Black carbon (BC) from human and natural sources significantly affects polar climates.
  • Understanding BC's interaction with Arctic clouds is crucial for atmospheric deposition.
  • Long-term observational data on equivalent black carbon (eBC) in Arctic clouds is limited.

Purpose of the Study:

  • To investigate the behavior and seasonal cycle of equivalent black carbon (eBC) within Arctic clouds.
  • To analyze factors influencing BC scavenging by clouds, such as cloud water content and temperature.
  • To identify potential sources of BC affecting Arctic cloud composition.

Main Methods:

  • Utilized the first long-term observational dataset of eBC inside and outside clouds.
  • Collected data at Zeppelin Observatory, Svalbard, a key Arctic monitoring site.
  • Employed trajectory analysis to determine air mass origins and potential BC sources.

Main Results:

  • Observed a distinct seasonal cycle of cloud residual eBC, peaking in early spring (Arctic haze) and decreasing in summer.
  • Found a positive correlation between the scavenged fraction of eBC and cloud water content.
  • Noted lower eBC scavenging at low temperatures, suggesting mixed-phase cloud processes influence retention.

Conclusions:

  • Arctic haze significantly contributes to elevated eBC concentrations in clouds during spring.
  • Cloud properties, specifically water content and temperature, play a key role in BC scavenging efficiency.
  • Air mass origin differences highlight the importance of collocated aerosol-cloud measurements for accurate source attribution.