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SUMMARY:Reconstructing Southern Hemisphere hydroclimate over the Common Er
 a from paleoclimate records and climate models using data assimilation - Q
 uentin Dalaiden\, UCLouvain
DTSTART:20221109T140000Z
DTEND:20221109T150000Z
UID:TALK192308@talks.cam.ac.uk
CONTACT:Dr Michael Haigh
DESCRIPTION:Large climate changes have been observed in West Antarctica fo
 r several decades\, including mass loss from glaciers due to intrusions of
  warm oceanic mass into the ice shelf cavities. The satellite era is too s
 hort to understand the natural and forced drivers of these changes\, in pa
 rticular with the strong internal variability that prevails there. To exte
 nd\nhistorical changes beyond the satellite period\, we need to rely on in
 direct climate records from natural archives that record past environmenta
 l conditions\, namely paleoclimate\nrecords. In polar regions\, ice cores 
 provide the most common records. However\, these records only provide loca
 l information for specific variables. In order to provide a spatially comp
 lete multi-field reconstruction\, paleoclimate data assimilation methods h
 ave been emerging over the past years. Based on a probabilistic approach\,
  data assimilation optimally combines local information from paleoclimate 
 records with the physics of an Earth System\nModel. It thus ensures that t
 he resulting reconstruction is dynamically consistent with the climate phy
 sics given by the Earth System Model. In this talk\, we will see how relev
 ant\npaleoclimate data assimilation is to provide historical changes beyon
 d the satellite era\, and improve our knowledge about the dynamical relati
 onships. In particular\, a case study on the contribution of tropical vari
 ability to 20th century atmospheric changes in the Amundsen Sea sector wil
 l be presented\, along with future directions regarding historical ice she
 lf melting in West Antarctica.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/97859929989
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