TY - JOUR
T1 - Differential hydro-climatic evolution of East Javanese ecosystems over the past 22,000 years
AU - Ruan, Yanming
AU - Mohtadi, Mahyar
AU - van der Kaars, Sander
AU - Dupont, Lydie M.
AU - Hebbeln, Dierk
AU - Schefuß, Enno
PY - 2019/8/15
Y1 - 2019/8/15
N2 - The Maritime Continent, home to widespread tropical rainforest and millions of people, is the primary region of deep atmospheric convection on the Earth. However, debate exists whether the isotopologues of water reflect rainfall amount during the Last Glacial Maximum (LGM), resulting in different interpretations of the LGM climate of the Maritime Continent. Here we present paired leaf wax δ13C and δD records together with pollen data from a sediment core retrieved off East Java dating back to 22,000 years before present. We use three n-alkane homologues (n-C29, n-C31 and n-C33) in order to reconstruct past changes in vegetation types and seasonal rainfall. Our results suggest that in East Java, evergreen rainforest remained the dominant vegetation type in montane regions since the seasonality there remained relatively unaltered over the entire period. In contrast, the East Javanese lowlands were characterised by C4 grass expansion and an extended dry season but a wetter rainy season, thus stronger seasonality, during the LGM.
AB - The Maritime Continent, home to widespread tropical rainforest and millions of people, is the primary region of deep atmospheric convection on the Earth. However, debate exists whether the isotopologues of water reflect rainfall amount during the Last Glacial Maximum (LGM), resulting in different interpretations of the LGM climate of the Maritime Continent. Here we present paired leaf wax δ13C and δD records together with pollen data from a sediment core retrieved off East Java dating back to 22,000 years before present. We use three n-alkane homologues (n-C29, n-C31 and n-C33) in order to reconstruct past changes in vegetation types and seasonal rainfall. Our results suggest that in East Java, evergreen rainforest remained the dominant vegetation type in montane regions since the seasonality there remained relatively unaltered over the entire period. In contrast, the East Javanese lowlands were characterised by C4 grass expansion and an extended dry season but a wetter rainy season, thus stronger seasonality, during the LGM.
KW - Ecosystem
KW - Last glacial maximum
KW - Leaf wax homologues
KW - Leaf wax isotopes
KW - Maritime continent
KW - Paleoclimatology
UR - http://www.scopus.com/inward/record.url?scp=85067438861&partnerID=8YFLogxK
U2 - 10.1016/j.quascirev.2019.06.015
DO - 10.1016/j.quascirev.2019.06.015
M3 - Article
AN - SCOPUS:85067438861
SN - 0277-3791
VL - 218
SP - 49
EP - 60
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
ER -