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SUMMARY:Disentangling the Upper Tropospheric and Lower Stratospheric Circu
 lation Responses to Increased CO2: Considering Interactive Ozone Impacts\,
  (Non)Linearity\, Regionality\, and Vertical Structure - Molly Menzel\, NA
 SA GIS
DTSTART:20240311T130000Z
DTEND:20240311T140000Z
UID:TALK211645@talks.cam.ac.uk
CONTACT:Prof. John R. Taylor
DESCRIPTION:There are a slew of ways atmospheric circulation responds to i
 ncreased CO2. In the troposphere\, the Hadley Circulation expands\, the tr
 opical upwelling narrows\, and the subtropical jet strengthens. Meanwhile 
 in the stratosphere\, the Brewer-Dobson Circulation accelerates\, seen by 
 the narrowing and strengthening of the tropical upwelling. Although recent
  work revealed independent circulation changes between the two domains\, n
 o study has successfully isolated the response of the upper troposphere fr
 om that of the lower stratosphere. Here\, we present a deeper examination 
 of the patterns related to the circulation responses in the upper troposph
 ere and lower stratosphere. First\, we design idealized simulations with t
 he NASA Goddard Institute for Space Studies (GISS) E2.2 model to decompose
  the full atmospheric response to CO2 into three components\; the direct C
 O2 radiative response\, the response to sea surface temperature changes\, 
 and the response to the interactive ozone. This decomposition shows how th
 e ozone impact on the BDC strength is as large as the direct CO2 radiative
  response and isolates the lower stratospheric circulation response with n
 egligible change in the troposphere. Second\, we present a comprehensive v
 iew of the Hadley Circulation's response to CO2 forcings ranging from 2- t
 o 8xCO2. Analysis of output from the  NASA GISS E2.2 model shows the uppe
 r tropospheric circulation response is also decoupled from that of the low
 er troposphere\; lower tropospheric features show curious nonlinearity bet
 ween 2- and 4xCO2\, the response of the upper troposphere largely reflects
  a vertical shift in the circulation\, and the regional patterns of circul
 ation response deviate from conclusions derived by the zonal-mean framewor
 k. Altogether\, these findings offer new insight into the physical process
 es involved in the distinct upper tropospheric and lower stratospheric res
 ponses to increased CO2.\n
LOCATION:MR5\, CMS
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