@article {2905,
	title = {Evaluating the Radiocarbon Reservoir Effect in Lake Kutubu, Papua New GuineaABSTRACT},
	journal = {Radiocarbon},
	volume = {61},
	year = {2019},
	month = {Jan-02-2019},
	pages = {287 - 308},
	abstract = {Conceptual models predict a tight coupling between the Intertropical Convergence Zone (ITCZ) and the Southern Westerly Winds (SWW) in response to glacial-interglacial transitions, yet little is known about this relationship under Holocene boundary conditions. Here we present a synthesis of Holocene pollen data from the southwest Pacific mid-latitudes that tracks changes in the SWW. Comparison of our SWW paleoclimate records with data tracking the ITCZ, oceanic circulation, and insolation reveals clearly synchronous and in-phase ITCZ-SWW dynamics between 12 and 5 ka, indicating a tight coupling between the tropics and southern mid-latitudes in response to ocean circulation and insolation. An apparent decoupling of the SWW and ITCZ in the Pacific region after 5 ka is attributable to the overriding influence of the El Ni{\~n}o{\textendash}Southern Oscillation (ENSO) over the proxy data.},
	issn = {0033-8222},
	doi = {10.1017/RDC.2018.49},
	url = {https://www.cambridge.org/core/product/identifier/S0033822218000498/type/journal_article},
	author = {Schneider, Larissa and Pain, Colin F and Haberle, Simon and Blong, Russell and Alloway, Brent V and Fallon, Stewart J and Hope, Geoff and Zawadzki, Atun and Heijnis, Henk}
}
@article {2896,
	title = {Variance and Rate-of-Change as Early Warning Signals for a Critical Transition in an Aquatic Ecosystem State: A Test Case From Tasmania, Australia},
	journal = {Journal of Geophysical Research: Biogeosciences},
	volume = {123},
	year = {2018},
	month = {Jan-02-2018},
	pages = {495 - 508},
	abstract = {Critical transitions in ecosystem states are often sudden and unpredictable. Consequently, there is a concerted effort to identify measurable early warning signals (EWS) for these important events. Aquatic ecosystems provide an opportunity to observe critical transitions due to their high sensitivity and rapid response times. Using palaeoecological techniques, we can measure properties of time series data to determine if critical transitions are preceded by any measurable ecosystem metrics, that is, identify EWS. Using a suite of palaeoenvironmental data spanning the last 2,400 years (diatoms, pollen, geochemistry, and charcoal influx), we assess whether a critical transition in diatom community structure was preceded by measurable EWS. Lake Vera, in the temperate rain forest of western Tasmania, Australia, has a diatom community dominated by Discostella stelligera and undergoes an abrupt compositional shift at ca. 820 cal yr BP that is concomitant with increased fire disturbance of the local vegetation. This shift is manifest as a transition from less oligotrophic acidic diatom flora (Achnanthidium minutissimum, Brachysira styriaca, and Fragilaria capucina) to more oligotrophic acidic taxa (Frustulia elongatissima, Eunotia diodon, and Gomphonema multiforme). We observe a marked increase in compositional variance and rate-of-change prior to this critical transition, revealing these metrics are useful EWS in this system. Interestingly, vegetation remains complacent to fire disturbance until after the shift in the diatom community. Disturbance taxa invade and the vegetation system experiences an increase in both compositional variance and rate-of-change. These trends imply an approaching critical transition in the vegetation and the probable collapse of the local rain forest system.},
	keywords = {carbon and nitrogen stable isotopes, critical transitions, diatoms, early warning signals, polleen, Tasmania},
	doi = {10.1002/2017JG004135},
	url = {http://doi.wiley.com/10.1002/2017JG004135},
	author = {Beck, Kristen K. and Fletcher, Michael-Shawn and Gadd, Patricia S. and Heijnis, Henk and Saunders, Krystyna M. and Simpson, Gavin L. and Zawadzki, Atun}
}
@article {2904,
	title = {Coupling of the Intertropical Convergence Zone and Southern Hemisphere mid-latitude climate during the early to mid-Holocene},
	journal = {Geology},
	volume = {45},
	year = {2017},
	month = {Jan-12-2017},
	pages = {1083 - 1086},
	abstract = {Conceptual models predict a tight coupling between the Intertropical Convergence Zone (ITCZ) and the Southern Westerly Winds (SWW) in response to glacial-interglacial transitions, yet little is known about this relationship under Holocene boundary conditions. Here we present a synthesis of Holocene pollen data from the southwest Pacific mid-latitudes that tracks changes in the SWW. Comparison of our SWW paleoclimate records with data tracking the ITCZ, oceanic circulation, and insolation reveals clearly synchronous and in-phase ITCZ-SWW dynamics between 12 and 5 ka, indicating a tight coupling between the tropics and southern mid-latitudes in response to ocean circulation and insolation. An apparent decoupling of the SWW and ITCZ in the Pacific region after 5 ka is attributable to the overriding influence of the El Ni{\~n}o{\textendash}Southern Oscillation (ENSO) over the proxy data.},
	issn = {0091-7613},
	doi = {10.1130/G39705.110.1130/2017385},
	url = {https://pubs.geoscienceworld.org/geology/article-lookup?doi=10.1130/G39705.1},
	author = {Mariani, Michela and Fletcher, Michael-Shawn and Drysdale, Russell N. and Saunders, Krystyna M. and Heijnis, Henk and Jacobsen, Geraldine and Zawadzki, Atun}
}
