TEXES observations of Saturn's stratospheric thermal structure after the 2010 convective event

Details TEXES observations of Saturn's stratospheric thermal structure after the 2010 convective event TEXES observations of Saturn's stratospheric thermal structure after the 2010 convective event

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p13c1681f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P13C-1681

Other

[5704] Planetary Sciences: Fluid Planets / Atmospheres, [5739] Planetary Sciences: Fluid Planets / Meteorology, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

In December 2010, a huge convective event distorted the cloud layer at 40 N in Saturn's springtime hemisphere. These large convective events are observed regularly in Saturn's atmosphere, about one event per saturnian year, and may play a central role in the transport of the internal heat flux to the radiative layer. However, this event occured at a season (Ls=16) different from that of the previous events (Ls= 110-170). Another unexpected aspect of the 2010 event was its stratospheric signature. As shown by Fletcher et al. (2011) from Cassini/CIRS and VLT/VISIR, in the 40N latitude band, the 1-mbar pressure level warmed by several tens of K at some longitudes and cooled by several K at other longitudes. In order to assess the vertical thermal structure in the disturbed latitudinal band, we performed five half-nights of observations with TEXES mounted on the NASA Infrared Telescope Facility (IRTF) from July 14th, 2011 to July 19th, 2011. The high spectral resolution (R=100,000) provided by TEXES allowed us to resolve several lines of methane in the range 1245-1250 cm-1, and the H2 S(1) quadrupole line and collision-induced continuum to measure the temperature structure between 100~mbar and 0.01~mbar. We will present the results of the observations in terms of stratospheric temperature structure.

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