Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources, transport and composition

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • Megan D Willis
  • Heiko Bozem
  • Daniel Kunkel
  • Alex KY Lee
  • Hannes Schulz
  • Julia Burkart
  • Amir A Aliabadi
  • Andreas B Herber
  • W Richard Leaitch
  • Jonathan PD Abbatt
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000455004100001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/acp-19-57-2019
eISSN
1680-7324
Externe Identifier
  • Clarivate Analytics Document Solution ID: HG5GI
ISSN
1680-7316
Ausgabe der Veröffentlichung
1
Zeitschrift
ATMOSPHERIC CHEMISTRY AND PHYSICS
Paginierung
57 - 76
Datum der Veröffentlichung
2019
Status
Published
Titel
Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources, transport and composition
Sub types
  • Article
Ausgabe der Zeitschrift
19

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:p>Abstract. The sources, chemical transformations and removal mechanisms of aerosol transported to the Arctic are key factors that control Arctic aerosol–climate interactions. Our understanding of sources and processes is limited by a lack of vertically resolved observations in remote Arctic regions. We present vertically resolved observations of trace gases and aerosol composition in High Arctic springtime, made largely north of 80∘ N, during the NETCARE campaign. Trace gas gradients observed on these flights defined the polar dome as north of 66–68∘ 30′ N and below potential temperatures of 283.5–287.5 K. In the polar dome, we observe evidence for vertically varying source regions and chemical processing. These vertical changes in sources and chemistry lead to systematic variation in aerosol composition as a function of potential temperature. We show evidence for sources of aerosol with higher organic aerosol (OA), ammonium and refractory black carbon (rBC) content in the upper polar dome. Based on FLEXPART-ECMWF calculations, air masses sampled at all levels inside the polar dome (i.e., potential temperature &lt;280.5 K, altitude &lt;∼3.5 km) subsided during transport over transport times of at least 10 days. Air masses at the lowest potential temperatures, in the lower polar dome, had spent long periods (&gt;10 days) in the Arctic, while air masses in the upper polar dome had entered the Arctic more recently. Variations in aerosol composition were closely related to transport history. In the lower polar dome, the measured sub-micron aerosol mass was dominated by sulfate (mean 74 %), with lower contributions from rBC (1 %), ammonium (4 %) and OA (20 %). At higher altitudes and higher potential temperatures, OA, ammonium and rBC contributed 42 %, 8 % and 2 % of aerosol mass, respectively. A qualitative indication for the presence of sea salt showed that sodium chloride contributed to sub-micron aerosol in the lower polar dome, but was not detectable in the upper polar dome. Our observations highlight the differences in Arctic aerosol chemistry observed at surface-based sites and the aerosol transported throughout the depth of the Arctic troposphere in spring. </jats:p>
Autoren
  • Megan D Willis
  • Heiko Bozem
  • Daniel Kunkel
  • Alex KY Lee
  • Hannes Schulz
  • Julia Burkart
  • Amir A Aliabadi
  • Andreas B Herber
  • W Richard Leaitch
  • Jonathan PD Abbatt
DOI
10.5194/acp-19-57-2019
eISSN
1680-7324
Ausgabe der Veröffentlichung
1
Zeitschrift
Atmospheric Chemistry and Physics
Sprache
en
Online publication date
2019
Paginierung
57 - 76
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/acp-19-57-2019
Datum der Datenerfassung
2020
Titel
Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources, transport and composition
Ausgabe der Zeitschrift
19

Datenquelle: Crossref

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