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DTSTART:20250330T030000
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DTSTAMP:20260310T222749Z
UID:1739183400@ist.ac.at
DTSTART:20250210T113000
DTEND:20250210T123000
DESCRIPTION:Speaker: Simona Bordoni\nhosted by Caroline Muller\nAbstract: I
 t is well known that atmospheric water vapor\, which depends nonlinearly o
 n temperature through the Clausius-Clapeyron relation\, has a profound im
 pact on Earth’s climate. First\, it is a potent greenhouse gas\, exertin
 g a strong positive radiative feedback. Second\, it undergoes phase trans
 itions\, with the associated latent heat release having direct and indirec
 t influences on tropical and extratropical circulations. An aspect that h
 as\, however\, remained relatively unexplored is that atmospheric water v
 apor\, by contributing to the energy content of an atmospheric column\, ca
 n alter its effective heat capacity and can thus potentially mediate the 
 circulation response to any seasonally varying forcing.  In this talk\, I
  will show how this effect can lead to interesting seasonal behaviors\, w
 hich we explore in simulations with an idealized GCM in aquaplanet configu
 ration. Simulations of Earth-like monsoons in this model show a progressi
 ve delay in the  timing of monsoon onset with global warming\, consisten
 t with Earth System Model outputs in the CMIP archives. Analyses of the mo
 ist static energy budget reveal how\, at the beginning of the warm season
 \, atmospheric latent energy storage becomes increasingly important as the
  climate warms.  This storage is able to compensate any change in net en
 ergy input\, negating the need for change in the circulation\, and thus l
 eading to the observed monsoon onset delay. In a broader planetary contex
 t\, changes in atmospheric latent energy storage also play an important ro
 le in the extratropical circulation of Earth-like planets with high obliq
 uity simulated with the same idealized GCM. I will show how on high-obliqu
 ity planets with a small surface thermal inertia\, net energy deficit dur
 ing the winter months is primarily balanced by the latent energy componen
 t of the atmosphere\, which buffers any significant atmospheric cooling. A
 s temperatures finally start to decrease\, condensational latent heat rel
 ease of atmospheric moisture further slows down the cooling and keeps the 
 winter pole warmer than the midlatitudes until after the winter solstice.
  This prevents vigorous baroclinic eddy activity as well as the developme
 nt of a Ferrel cell and storm track.
LOCATION:RLH\, ISTA
ORGANIZER:maria.arias.sutil@ista.ac.at
SUMMARY:Simona Bordoni: The Influence of Moisture on Seasonally Varying Cir
 culations in Planetary Atmospheres
URL:https://talks-calendar.ista.ac.at/events/5151
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