Vaughan Phillips
Universitetslektor
Small ice crystals and the climatology of lightning
Författare
Summary, in English
[1] Vigorous debate still surrounds the cloud electrification process and unexplained regional variations in lightning activity. Here, we show that climatological maxima in lightning activity are associated with small effective diameter D-e of ice crystals near cumulonimbus cloud tops. This relationship, unlike lightning's more well-known relationship with cloud top height, is consistent over land and ocean. Since multiple studies indicate that D-e is reduced by atmospheric aerosol, this relationship strengthens previous suggestions of a role for aerosols as well as dynamics in electrification. Moreover, the angular distribution of backscattered radiance shows that modest (similar to 10%) D-e decreases reflect large (similar to 2x) increases in the number of small (< similar to 30 mu m) particles N, a finding supported by cloud model simulations. Both relationships provide an important new test of cloud microphysics and/or electrification models.
Publiceringsår
2006
Språk
Engelska
Sidor
05804-05804
Publikation/Tidskrift/Serie
Geophysical Research Letters
Volym
33
Issue
5
Dokumenttyp
Artikel i tidskrift
Förlag
American Geophysical Union (AGU)
Ämne
- Physical Geography
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1944-8007