FN Archimer Export Format
PT J
TI Orbital-scale climate forcing of grassland burning in southern Africa
BT 
AF DANIAU, Anne-Laure
   GONI, Maria Fernanda Sanchez
   MARTINEZ, Philippe
   URREGO, Dunia H.
   BOUT-ROUMAZEILLES, Viviane
   DESPRAT, Stephanie
   MARLON, Jennifer R.
AS 1:1,2,3;2:2;3:1;4:1,2,3;5:4;6:2;7:5;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Univ Bordeaux 1, CNRS, UMR 5805, F-33400 Talence, France.
   Ecole Prat Hautes Etud, UMR 5805, F-33400 Talence, France.
   CNRS, UMR 5199, F-33400 Talence, France.
   Univ Lille 1, CNRS, Geosyst UMR 8217, F-59655 Villeneuve Dascq, France.
   Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA.
C2 UNIV BORDEAUX, FRANCE
   EPHE, FRANCE
   CNRS, FRANCE
   UNIV LILLE, FRANCE
   UNIV YALE, USA
IF 9.809
TC 105
UR https://archimer.ifremer.fr/doc/00181/29235/27640.pdf
LA English
DT Article
CR MD 142 / ALIENOR 2
   MOZAPHARE-MD104
   NAUSICAA-IMAGES 2-MD105
BO Marion Dufresne
AB Although grassland and savanna occupy only a quarter of the world's vegetation, burning in these ecosystems accounts for roughly half the global carbon emissions from fire. However, the processes that govern changes in grassland burning are poorly understood, particularly on time scales beyond satellite records. We analyzed microcharcoal, sediments, and geochemistry in a high-resolution marine sediment core off Namibia to identify the processes that have controlled biomass burning in southern African grassland ecosystems under large, multimillennial-scale climate changes. Six fire cycles occurred during the past 170,000 y in southern Africa that correspond both in timing and magnitude to the precessional forcing of north-south shifts in the Intertropical Convergence Zone. Contrary to the conventional expectation that fire increases with higher temperatures and increased drought, we found that wetter and cooler climates cause increased burning in the study region, owing to a shift in rainfall amount and seasonality (and thus vegetation flammability). We also show that charcoal morphology (i.e., the particle's length-to-width ratio) can be used to reconstruct changes in fire activity as well as biome shifts over time. Our results provide essential context for understanding current and future grassland-fire dynamics and their associated carbon emissions.
PY 2013
PD MAR
SO Proceedings Of The National Academy Of Sciences Of The United States Of America
SN 0027-8424
PU Natl Acad Sciences
VL 110
IS 13
UT 000318031900050
BP 5069
EP 5073
DI 10.1073/pnas.1214292110
ID 29235
ER

EF