BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:What can we learn from simulations of the dust intensification ove
 r Greenland during the last ice-age? - Peter Hopcroft\, School of Geograph
 y\, Earth &amp\; Environmental Sciences\, University of Birmingham\, UK.
DTSTART:20240130T110000Z
DTEND:20240130T120000Z
UID:TALK211513@talks.cam.ac.uk
CONTACT:Dr Megan Brown
DESCRIPTION:Atmospheric mineral dust loading was around 2-4 times greater 
 than present day during the last glacial maximum and the flux reconstructe
 d over Greenland was several orders of magnitude higher. The glacial clima
 te was also characterised by rapid transitions from cold to warm (stadial 
 to interstadial states) during which the Greenland dust flux varied by a f
 actor of around 20. Over Europe\, loess profiles accumulated during the co
 ld phases and these show a one-to-one correspondence with Greenland ice-co
 re dust peaks. Size-resolved geochemical analyses have recently shown two 
 distinct sources of this European loess\, whilst the provenance of glacial
  dust in Greenland is subject to ongoing debate. In this talk I’ll intro
 duce a set of Earth System model simulations using the HadGEM2-ES model de
 signed to simulate coupled climate-dust changes during the Last Glacial Ma
 ximum and in response to abrupt cooling events. These simulations show tha
 t the circum-Atlantic sector (primarily the Sahel with smaller contributio
 ns from central America and Alaska) could have made substantial contributi
 ons to dust over the Atlantic region. This is primarily because the modell
 ed cooling weakens the hydrological cycle over the northern tropics and in
 creases emissions and weakens in-transport deposition. I’ll look at how 
 well these model results fit available records and discuss potential impli
 cations of changes in dust radiative forcing. I’ll conclude with possibl
 e avenues for further refining our understanding of these large palaeo-dus
 t variations.
LOCATION:Chemistry Dept\, Unilever Lecture Theatre and Zoom
END:VEVENT
END:VCALENDAR