Premium
Airborne brightness temperature measurements of the polar winter troposphere as part of the Airborne Arctic Stratosphere Experiment II and the effect of brightness temperature variations on the diabatic heating in the lower stratosphere
Author(s) -
Valero Francisco P. J.,
Platnick Steven,
Kinne Stefan,
Pilewskie Peter,
Bucholtz Anthony
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl03003
Subject(s) - stratosphere , troposphere , atmospheric sciences , brightness temperature , environmental science , radiative transfer , volcano , brightness , altitude (triangle) , tropopause , atmospheric radiative transfer codes , polar , ozone layer , aerosol , lapse rate , atmospheric temperature , climatology , meteorology , geology , physics , astronomy , geometry , mathematics , quantum mechanics , seismology
In this paper we report radiometric measurements of tropospheric brightness temperatures obtained during the AASE II experiment. These measurements represent the first attempt to characterize effective radiative temperatures as seen from above the troposphere during the Arctic winter. The reported measurements include brightness temperatures at 6.7 and 10.5μm as seen from the NASA DC‐8 aircraft flying at about 11 km altitude. We also present radiative transfer calculations to estimate the effect of tropospheric brightness temperature on the lower stratospheric heating rates. Because of the recent massive eruption of the Pinatubo volcano, we also discuss the effects of a volcanic aerosol layer. It is concluded that small particles like the volcanic aerosol or PSCs type 1 do not affect stratospheric heating rates by much; on the other hand, larger particles, PSCs types 2 and 3, may have significant effects on heating rates and consequently on dynamics of the lower stratosphere. The dynamical effects of local stratospheric temperature variations are briefly discussed.