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SUMMARY:Climatic controls on peatland carbon accumulation during the last 
 millennium - Angela Gallego-Sala\, University of Exeter
DTSTART:20171116T173000Z
DTEND:20171116T183000Z
UID:TALK73124@talks.cam.ac.uk
CONTACT:Della Murton
DESCRIPTION:Peatland ecosystems are a small but persistent sink of carbon 
 and currently store more than 600 Pg C globally. Peatlands preserve a stra
 tigraphic record of net carbon accumulation\, the net outcome of plant res
 piration and respiration. The rates of both these processes will increase 
 with warming and an important question is which of these will dominate the
  overall response of the global peatland carbon sink to future climatic ch
 anges. In this seminar\, I will present the results of a global study of c
 hanges in peatland carbon accumulation rates over the last millennium. Thi
 s study explores the relationship between carbon accumulation rates over t
 he last millennium and modern climate space. The results indicate that the
 re is a positive relationship between carbon accumulation and photosynthet
 ically active radiation for mid- to high-latitude peatlands in both hemisp
 heres\, i.e. carbon accumulation is lowest at high latitudes where PAR0 is
  lowest. However\, this relationship reverses for sites at lower latitudes
 \, suggesting that carbon accumulation is reduced under the warmest climat
 e regimes. This is important because it highlights that there are limits t
 o the predicted negative feedback of the peatland carbon sink to warming. 
 I will additionally present modelled future projections under RCP2.6 and R
 CP8.5 scenarios to explain that the overall peatland negative feedback doe
 s not necessarily persist in time.
LOCATION:Latimer Room (Old Court)\, Clare College\, Trinity Lane
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