SEASONALITY: "First, during water uptake, plants are expected to sample the spring growing season precipitation, at the end of the wet season [October-March], as the temperature warms up and before the dry summer months (Feakins and Sessions, 2010; Kahmen et al., 2011; Tipple et al., 2013). During this time, the plants may record the isotopic signature of just a few storms each year heightening variability; however, sedimentary samples integrating a decade might average the signal from > 20 storms. " PARAMETER: "Paleoclimatic interpretation of the precipitation isotopic history recorded in the Crystal Cave has been suggested to record changes in moisture source primarily and local amount effect secondarily (McCabe-Glynn et al., 2013). ... Our record provides an extension of the Crystal Cave isotopic record, from a more southerly coastal location, but likely also records interdecadal variability in the same processes."

Secondly, plant community changes in the catchment (or other ecological changes) may influence the dD record. Vegetation changes could reasonably have an influence on the mean catchment ewax/precip that lasts for decades, so this mecha- nism might operate too slowly to explain sample-to-sample vari- ability in the sediment, although it may contribute to the multi- decadal variability. We observed abundance variation in homo- logues downcore (Fig. 5), which could be consistent with ecological changes influencing dD values; however, the non-unique chain length distributions of different plant species (Bush and McIner- ney, 2013) make it impossible to draw unique solutions here.

Needs entry for isotopeInterpretation1_name (GF)

Of all the homologues presented in this study, C28 is used for paleoclimate interpretation: "Of all the homologues (Fig. 7a), C26 and C28 showed the most coherent and reliable evidence for terrigenous vegetation sources downcore, and we relied on C28 for paleoclimate reconstruction as before (Feakins et al., 2012)."

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