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DESCRIPTION:Atmospheric and Oceanic Sciences Departmental Seminar Series\n
 \npresents\n\nWhy does climate sensitivity go up as ocean heat uptake decl
 ines? A linear systems perspective\n\na talk by\n	Brian Rose\n	Assistant Pro
 fessor\, Atmospheric and Environmental Sciences\, University of Albany\, S
 tate University of New York\, New York\n\nTransient climate sensitivity te
 nds to increase on multiple timescales in climate models subject to an abr
 upt CO2 increase\, which suggests that (1) we may be systematically undere
 stimating equilibrium sensitivity in the models\, and (2) constraining equ
 ilibrium sensitivity from observations is a tricky business at best. I wil
 l argue that the radiative feedback and ocean heat uptake processes govern
 ing transient sensitivity are intimately and physically connected. Idealiz
 ed GCM experiments show that the global climatic impact of spatially local
 ized ocean heat uptake patterns are very sensitive to their geographical d
 istribution. I will discuss these results in terms of the efficacy concept
  and a linear systems perspective in which responses to individual climate
  forcing agents are additive. Heat uptake can be treated as a slowly varyi
 ng forcing on the atmosphere and surface\, whose efficacy is strongly dete
 rmined by its spatial pattern. An illustrative linear model demonstrates t
 he emergence of increasing climate sensitivity as a simple consequence of 
 the slow decay of high-efficacy sub-polar heat uptake. Shortwave cloud fee
 dbacks are a key player in this increasing climate sensitivity\, both in i
 dealized and comprehensive models. I propose a causal physical mechanism l
 inking sub-polar heat uptake to a global-scale increase in lower-troposphe
 ric stability.\n\nMonday Sep 23/ 3:30 PM/ Burnside Hall/ Room 934\n
DTSTART:20190923T193000Z
DTEND:20190923T210000Z
LOCATION:Room 934
SUMMARY:Why does climate sensitivity go up as ocean heat uptake declines? A
  linear systems perspective
URL:https://www.mcgill.ca/meteo/channels/event/why-does-climate-sensitivity
 -go-ocean-heat-uptake-declines-linear-systems-perspective-300718
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