[Eoas-seminar] EOAS Colloquium Friday March 6: Prof. Melissa Gervais (Penn State)

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Sun Mar 1 15:30:15 EST 2020

Dear all, 

This Friday March 6 at 3:30 PM the EOAS Colloquium in 1050 EOA will be given by Prof. Melissa Gervais <http://www.met.psu.edu/people/mmg62> of Penn State University. Prof. Gervais will speak about “The North Atlantic warming hole: From causes to impacts” (abstract below).  

Prof. Gervais has broad interests in climate dynamics, in particular, how changes in surface forcing by the oceans and sea ice might influence atmospheric circulation. Please contact Allison Wing (awing at fsu.edu <mailto:awing at fsu.edu>) if you would like to meet with Prof. Gervais. 

We hope to see you all there! 

Title: The North Atlantic warming hole: From causes to impacts
Abstract: A warming deficit in North Atlantic sea surface temperatures (SSTs) is a striking feature in global climate model future projections.  Such changes in ocean temperature themselves can have implications for fisheries and wildlife and furthermore this region of reduced warming could have an impact on weather downstream over Europe.   The goal of this work is to obtain a holistic understanding of the coupled processes involved in both the development of the warming hole and it’s impacts on the atmosphere.  An analysis of the Community Earth System Model Large Ensemble simulations is conducted to obtain further insight into the development of the warming hole and its relationship to the Atlantic meridional overturning circulation.  In particular the important roles of increased freshwater flux and local changes in the ocean circulation on the development of the warming hole will be discussed.  A series of large ensemble CESM prescribed sea surface temperature (SST) and sea ice experiments are conducted where the warming hole is either filled or deepened to understand how the warming hole might influence the atmosphere. The results show both a direct linear response and an indirect eddy driven response that acts to strength and shift the North Atlantic jet poleward.  These local changes in the North Atlantic eddy driven jet are of a similar magnitude to the full climate change response in the region, indicating that the North Atlantic warming hole could be an important additional factor in the “tug of war” on the midlatitude circulation that has yet to be explored.  Finally, the impacts of the warming on European weather are explored with the use of a machine learning method, self-organizing maps. 

Allison A. Wing, Ph.D.
Assistant Professor
Department of Earth, Ocean, and Atmospheric Science
Florida State University
awing at fsu.edu

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