[Eoas-seminar] TODAY - Meteorology Seminar

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Tue Apr 4 08:59:42 EDT 2017

Hi Paige,

Is he available to talk with earlier in the day?


On 4/4/2017 8:56 AM, eoas-seminar at lists.fsu.edu wrote:
> Good Morning,
> Today, *Tuesday April 4 at 3:30 PM*, we will have a special seminar 
> given by Dr. Tim Cronin <http://web.mit.edu/%7Etwcronin/www/> (MIT). 
> Dr. Cronin is an assistant professor in the Department of Earth, 
> Atmospheric and Planetary Sciences at MIT who studies a variety of 
> subjects related to climate, especially idealized modeling of the 
> atmosphere and atmosphere-land system with single-column and 
> limited-area models. He will speak about:
> *“Arctic temperature profiles and their sensitivity to climate change” 
> *(abstract below)
> —————————————————————————————————————————
> *Arctic temperature profiles and their sensitivity to climate change*
> The high-latitude vertical structure of temperature is poorly 
> understood, yet is an important factor in the polar amplification of 
> climate change. To better understand the high-latitude lapse rate and 
> its sensitivity to various forcings, we explore two perspectives on 
> the high-latitude temperature structure.
> The first is the Lagrangian perspective of Arctic air formation. We 
> prescribe the initial sounding of the atmosphere representing an air 
> column starting over the ocean, then allow the air mass to evolve for 
> two weeks in the absence of any solar heating, representing the 
> movement of the air column over a high-latitude continent. Using a 
> single-column model, we find that a low-cloud feedback slows cooling 
> of the surface and amplifies continental warming, increasing the 
> continental surface air temperature by roughly two degrees for each 
> degree increase of the initial maritime surface air temperature.
> The second is the Eulerian perspective of radiative-advective 
> equilibrium. High latitude temperature profiles are generally stable 
> to convection, with frequent surface-based inversions, especially in 
> winter. Such profiles result from the stabilizing influences of 
> advective heat flux convergence and atmospheric solar absorption, 
> which dominate over the destabilizing influences of surface solar 
> absorption and subsurface heating. We formulate an analytical model 
> that represents the dominant balance between advective heating and 
> radiative cooling, and discuss how climate feedbacks in this state 
> depend on the type of forcing.
> Speaker’s website: http://mit.edu/~twcronin/www/ 
> <http://mit.edu/%7Etwcronin/www/>
> Paige Phillips
> Academic Program Specialist - Meteorology  I Earth, Ocean, & 
> Atmospheric Science (EOAS)  I Florida State University  I 410 Love 
> Building  I 1017 Academic Way, Tallahassee, Florida 32306  I (850) 
> 644-8582  I www.eoas.fsu.edu
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