Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Observations of the spectral dependence of linear particle depolarization ratio of aerosols using NASA Langley airborne High Spectral Resolution Lidar
SMHI, Forskningsavdelningen, Luftmiljö.ORCID-id: 0000-0001-5695-1356
Visa övriga samt affilieringar
2015 (Engelska)Ingår i: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 15, nr 23, s. 13453-13473Artikel i tidskrift (Refereegranskat) Published
Resurstyp
Text
Abstract [en]

Linear particle depolarization ratio is presented for three case studies from the NASA Langley airborne High Spectral Resolution Lidar-2 (HSRL-2). Particle depolarization ratio from lidar is an indicator of non-spherical particles and is sensitive to the fraction of non-spherical particles and their size. The HSRL-2 instrument measures depolarization at three wavelengths: 355, 532, and 1064 nm. The three measurement cases presented here include two cases of dust-dominated aerosol and one case of smoke aerosol. These cases have partial analogs in earlier HSRL-1 depolarization measurements at 532 and 1064 nm and in literature, but the availability of three wavelengths gives additional insight into different scenarios for non-spherical particles in the atmosphere. A case of transported Saharan dust has a spectral dependence with a peak of 0.30 at 532 nm with smaller particle depolarization ratios of 0.27 and 0.25 at 1064 and 355 nm, respectively. A case of aerosol containing locally generated wind-blown North American dust has a maximum of 0.38 at 1064 nm, decreasing to 0.37 and 0.24 at 532 and 355 nm, respectively. The cause of the maximum at 1064 nm is inferred to be very large particles that have not settled out of the dust layer. The smoke layer has the opposite spectral dependence, with the peak of 0.24 at 355 nm, decreasing to 0.09 and 0.02 at 532 and 1064 nm, respectively. The depolarization in the smoke case may be explained by the presence of coated soot aggregates. We note that in these specific case studies, the linear particle depolarization ratio for smoke and dust-dominated aerosol are more similar at 355 nm than at 532 nm, having possible implications for using the particle depolarization ratio at a single wavelength for aerosol typing.

Ort, förlag, år, upplaga, sidor
2015. Vol. 15, nr 23, s. 13453-13473
Nationell ämneskategori
Miljövetenskap
Forskningsämne
Miljö
Identifikatorer
URN: urn:nbn:se:smhi:diva-1936DOI: 10.5194/acp-15-13453-2015ISI: 000367189600011OAI: oai:DiVA.org:smhi-1936DiVA, id: diva2:924805
Tillgänglig från: 2016-04-29 Skapad: 2016-03-03 Senast uppdaterad: 2017-11-30Bibliografiskt granskad

Open Access i DiVA

fulltext(10443 kB)575 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 10443 kBChecksumma SHA-512
f00190d3bd1d795bc6ab10d3dc93526ca4cd7bd8315f7390feb78f21a4c78e575a6c086be6df498fd07e28320e416f701ff6722cda5f0ce439a7f6c68d820aa2
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltext

Person

Kahnert, Michael

Sök vidare i DiVA

Av författaren/redaktören
Kahnert, Michael
Av organisationen
Luftmiljö
I samma tidskrift
Atmospheric Chemistry And Physics
Miljövetenskap

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 575 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 930 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf