Intra-annual variations of teak cellulose δ18O in Kerala, India: implications to the reconstruction of past summer and winter monsoon rains

Tree ring celluloseδ18O ofFokienia hodginsiiin northern Laos: A promising proxy to reconstruct ENSO?

“…Second, tree ring cellulose δ 18 O is not as strongly affected by the physiological characteristics of individual trees as ring width is [ Raffalli‐Delerce et al , 2004], and it has a limited effect of age and a lower autocorrelation [ McCarroll and Loader , 2004; Shi et al , 2011]. Third, tree ring cellulose δ 18 O can be employed as a chronometer and climatic indicator for trees lacking visible rings [ Anchukaitis et al , 2008; Anchukaitis and Evans , 2010; Evans and Schrag , 2004; Poussart and Schrag , 2005; Poussart et al , 2004] and can supply an intra‐annual resolution signal [ Managave et al , 2010; Roden et al , 2009]. Fourth, even for trees not growing at their “ecological” limit, it is possible to extract a strong climate signal using stable isotope methods, in which ring widths (and density) do not routinely yield useful climatic information [ Loader et al , 2008].…”

Multiple tree-ring chronologies (ring width, δ13C and δ18O) reveal dry and rainy season signals of rainfall in Indonesia

“…However, in their study a correlation with local or regional rainfall pattern was not tested in detail.  18 O studies on teak from India (Managave et al, 2010a;Managave et al, 2011) found both negative and positive correlations with the amount of rainy season rainfall at inter-and intra-annual scale. Studies in tropical regions of South-America have likewise reported negative correlation with the rainfall amount during rainy season (Ballantyne et al, 2010;Brienen et al, 2012), as have isotope studies in Southeast Asia (Sano et al, 2012;Xu et al, 2011;Zhu et al, 2012).…”

Model evaluation of the coherence of a common source water oxygen isotopic signal recorded by tree-ring cellulose and speleothem calcite

“…Leaf temperature was estimated from air temperature following Linacre [], Evans [] and Managave et al . [] (leaf temperature = (23/33) × air temperature + 10). Following relationship, obtained from the data provided by L. A. Cernusak (personal communication 2010), was used to calculate stomatal conductance from vapor pressure deficit (VPD) (i.e., leaf vapor pressure – ambient vapor pressure) …”