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  • Pereira Freitas, Gabriel,1993-Stockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI) (author)

Contribution of primary biological aerosol particles to low-level Arctic cloud condensation nuclei

  • BookEnglish

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  • LIBRIS-ID:oai:DiVA.org:su-223500
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-223500URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:vet swepub-contenttype
  • Subject category:ovr swepub-publicationtype

Notes

  • Mixed-phase clouds (MPC) are key players in the Arctic climate system due to their role in modulating solar and terrestrial radiation. Such radiative interactions critically rely on the ice content of MPC which, in turn, partly depends on the availability of ice nucleating particles (INP). INP sources and concentrations are poorly understood in the Arctic. Recently, INP active at high temperatures were linked to be primary biological aerosol particles (PBAP). Here, we investigated for a full year the PBAP abundance and variability within cloud residuals, directly sampled by a multiparameter bioaerosol spectrometer coupled to a ground-based counterflow virtual impactor inlet at the Zeppelin Observatory (475 m asl), Ny-Ålesund, Svalbard. PBAP concentrations (10−3–10−2L−1) and contributions to coarse-mode aerosol (1 in every 103–104) within cloud residuals were found to be close to those expected for concentrations of high-temperature INP. Transmission electron microscopy also confirmed the presence of PBAP, most likely bacteria, within the cloud residual samples. Seasonally, our results reveal an elevated presence of PBAP within cloud residuals during the summer. Parallel water vapor isotope measurements points towards a link between summer clouds and regionally sourced air masses. Low-level MPC were predominantly observed at the beginning and end of summer, and one explanation for their presence is the existence of high-temperature INP. In this study, we present observational evidence that PBAP might play a role in determining the phase of low-level Arctic clouds, with potential implications for the Arctic climate given ongoing changes in the hydrological and biogeochemical cycles that influence the PBAP flux in and towards the Arctic.

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  • Kopec, BenEcology and Genetics Research Unit, University of Oulu, Oulu, Finland (author)
  • Adachi, KoujiDepartment of Atmosphere, Ocean, and Earth System Modeling Research, Meteorological Research Institute, Tsukuba, Japan (author)
  • Krejci, Radovan,1970-Stockholms universitet,Institutionen för miljövetenskap,Meteorologiska institutionen (MISU),Bolincentret för klimatforskning (tills m KTH & SMHI)(Swepub:su)krejc (author)
  • Heslin-Rees, Dominic,1993-Stockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI)(Swepub:su)dohe1946 (author)
  • Yttri, Karl EspenThe Climate and Environmental Research Institute NILU, Kjeller, Norway (author)
  • Hubbard, AlunIC3 - Centre for Ice, Cryosphere, Carbon and Climate, Institutt for Geovitenskap, UiT - The Arctic University of Norway, Tromsø, Norway (author)
  • Welker, Jeffrey M.Ecology and Genetics Research Unit, University of Oulu, Oulu, Finland (author)
  • Zieger, Paul,1978-Stockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI),Meteorologiska institutionen (MISU)(Swepub:su)pzieg (author)
  • Stockholms universitetInstitutionen för miljövetenskap (creator_code:org_t)

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