Solid particles in the tropical lowest stratosphere


Autoria(s): Nielsen, J. K.; Larsen, N.; Cairo, F.; Di Donfrancesco, G.; Rosen, J. M.; Durry, G.; Held, G.; Pommereau, J. P.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

22/02/2007

Resumo

We report in situ and remote observations proving occasional occurrence of solid particles in the tropical lowest stratosphere, 200km from deep convective events. The particles were found during field campaigns in Southeast Brazil (49.03 W 22.36 S). They occur in the altitude range from 17.5 to 20.8 km, at temperatures up to at least 10 K above the expected frost point temperature. While stability of ice particles at these altitudes is unexpected from a theoretical point of view, it is argued that these observations are indications of tropospheric air masses penetrating into the stratosphere during convective overshoots. It is argued that the intrusion of tropospheric air must have carried a large amount of water with it, which effectively hydrated the lowest stratosphere, and consequently suppressed sublimation. This conclusion is further supported by a separate water vapor mixing ratio profile obtained at the same observation site.

Formato

685-695

Identificador

http://dx.doi.org/10.5194/acp-7-685-2007

Atmospheric Chemistry and Physics, v. 7, n. 3, p. 685-695, 2007.

1680-7316

1680-7324

http://hdl.handle.net/11449/69531

10.5194/acp-7-685-2007

WOS:000244224000002

2-s2.0-33847029665

2-s2.0-33847029665.pdf

Idioma(s)

eng

Relação

Atmospheric Chemistry and Physics

Direitos

openAccess

Palavras-Chave #air mass #atmospheric convection #atmospheric particle #in situ measurement #moisture flux #remote sensing #stratosphere #sublimation #tropical environment #water vapor #Brazil #South America
Tipo

info:eu-repo/semantics/article