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Pollen-Based Temperature and Precipitation Records of the Past University of Wollongong Research Online Faculty of Science, Medicine and Health - Papers Faculty of Science, Medicine and Health 2017 Pollen-based temperature and precipitation records of the past 14,600 years in northern New Zealand (37°S) and their linkages with the Southern Hemisphere atmospheric circulation Ignacio Jara Victoria University of Wellington Rewi Newnham Victoria University of Wellington Brent V. Alloway University of Wollongong Janet M. Wilmshurst Landcare Research NZ Andrew Rees Victoria University of Wellington Publication Details Jara, I. A., Newnham, R. M., Alloway, B. V., Wilmshurst, J. M. & Rees, A. B.H. (2017). Pollen-based temperature and precipitation records of the past 14,600 years in northern New Zealand (37°S) and their linkages with the Southern Hemisphere atmospheric circulation. The oH locene: a major interdisciplinary journal focusing on recent environmental change, 27 (11), 1756-1768. Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] Pollen-based temperature and precipitation records of the past 14,600 years in northern New Zealand (37°S) and their linkages with the Southern Hemisphere atmospheric circulation Abstract Regional vegetation, climate history, and local water table fluctuations for the past 14,600 years are reconstructed from pollen and charcoal records of an ombrogenous peatbog in northern New Zealand (38°S). A long-term warming trend between 14,600 and 10,000 cal. yr BP is punctuated by two brief plateaux between 14,200-13,800 and 13,500-12,000 cal. yr BP. Periods of relatively drier conditions are inferred between 14,000-13,400 and 12,000-10,000 cal. yr BP, while a long-term wet period is observed between 10,000 and 6000 cal. yr BP. The asl t 7000 years feature relatively stable temperatures, a long-term drying trend that culminates with persistent drier conditions over the last 3000 years and cyclical f luctuations in the bog's water table and fires. Present-day climate controls and comparisons with other climate reconstructions from New Zealand, the Southern Hemisphere mid-latitudes and the tropical Pacific us ggest that complex and temporally variable teleconnections exist between northern New Zealand and the Southern Hemisphere low- and high-latitude circulation. Disciplines Medicine and Health Sciences | Social and Behavioral Sciences Publication Details Jara, I. A., Newnham, R. M., Alloway, B. V., Wilmshurst, J. M. & Rees, A. B.H. (2017). Pollen-based temperature and precipitation records of the past 14,600 years in northern New Zealand (37°S) and their linkages with the Southern Hemisphere atmospheric circulation. The oH locene: a major interdisciplinary journal focusing on recent environmental change, 27 (11), 1756-1768. This journal article is available at Research Online: http://ro.uow.edu.au/smhpapers/5121 HOL0010.1177/0959683617708444The HoloceneJara et al. 708444research-article2017 Research paper The Holocene 2017, Vol. 27(11) 1756 –1768 Pollen-based temperature and precipitation © The Author(s) 2017 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav records of the past 14,600 years in northern DOI:https://doi.org/10.1177/0959683617708444 10.1177/0959683617708444 New Zealand (37°S) and their linkages with journals.sagepub.com/home/hol the Southern Hemisphere atmospheric circulation Ignacio A Jara,1,2 Rewi M Newnham,1 Brent V Alloway,3,4 Janet M Wilmshurst5 and Andrew BH Rees1 Abstract Regional vegetation, climate history, and local water table fluctuations for the past 14,600 years are reconstructed from pollen and charcoal records of an ombrogenous peatbog in northern New Zealand (38°S). A long-term warming trend between 14,600 and 10,000 cal. yr BP is punctuated by two brief plateaux between 14,200–13,800 and 13,500–12,000 cal. yr BP. Periods of relatively drier conditions are inferred between 14,000–13,400 and 12,000–10,000 cal. yr BP, while a long-term wet period is observed between 10,000 and 6000 cal. yr BP. The last 7000 years feature relatively stable temperatures, a long-term drying trend that culminates with persistent drier conditions over the last 3000 years and cyclical fluctuations in the bog’s water table and fires. Present-day climate controls and comparisons with other climate reconstructions from New Zealand, the Southern Hemisphere mid-latitudes and the tropical Pacific suggest that complex and temporally variable teleconnections exist between northern New Zealand and the Southern Hemisphere low- and high-latitude circulation. Keywords climate change, ENSO, New Zealand, peatbog, pollen, precipitation reconstruction, Southern Hemisphere paleoclimate, temperature reconstruction Received 4 September 2016; revised manuscript accepted 22 March 2017 Introduction Palynological records have valuable potential for reconstructing precipitation gradient – imposed by the intersection of axial temperature and rainfall variability at timescales that extend ranges with predominantly westerly circulation – influences the well beyond the instrumental record. Pollen–climate reconstruc- distribution of vegetation communities and certain species to an tions from New Zealand, positioned in the mid-latitudes of extent that offers opportunities to reconstruct precipitation from the South Pacific Ocean, can additionally provide insight into palynological records. Together with the well-established pattern past teleconnections with the Southern Hemisphere low- and of late Quaternary temperature variability, such precipitation high-latitude circulation systems. New Zealand pollen-based reconstructions can provide a stronger basis for exploring past reconstructions have helped to constrain the timing and struc- teleconnections between New Zealand climate and Southern ture of climate fluctuations during the late-Quaternary glacial Hemisphere circulation systems. cycles (Newnham et al., 2007; Vandergoes et al., 2005) and the In this study, we use a highly resolved pollen and microscopic transition from the last glacial to the Holocene (McGlone et al., charcoal record from an ombrogenous peatbog in Waikato region, 2010; Newnham et al., 1995a; Newnham and Lowe, 2000). northern New Zealand, to reconstruct the local and regional veg- Along with other proxy records, palynological sequences have etation history and its association with temperature and rainfall characterized a series of climate events for the last 30,000 years changes over the last 14,600 years. The vegetation setting of the (Alloway et al., 2007; Barrell et al., 2013). While pollen-based reconstructions are largely based on temperature proxies, much 1 School of Geography, Environment and Earth Sciences, Victoria less is known about precipitation variability for two general University of Wellington, New Zealand reasons: (1) precipitation constraints on vegetation are compara- 2Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Chile tively limited (e.g. McGlone and Moar, 1998) as the oceanic 3The University of Auckland, New Zealand climate lacks pronounced rainfall minima, and (2) precipitation 4University of Wollongong, Australia 5 anomalies and their relationship with hemispheric circulation Landcare Research, New Zealand are complex and heterogeneous, especially in northern New Corresponding author: Zealand where precipitation regimes are associated with both Ignacio A Jara, Centro de Estudios Avanzados en Zonas Áridas extra-tropical (westerly) and sub-tropical (easterly) circulation (CEAZA), Raúl Bitrán 1305, La Serena, Chile. (Ummenhofer and England, 2007). Nevertheless, a west–east Email: [email protected] Jara et al. 1757 Waikato region has two key advantages for developing regional easterly and northwesterly precipitation fronts (Kidson and temperature and precipitation proxies. First, the dominance of Renwick, 2002). mixed conifer–broadleaved forest over beech forest offers the possibility of developing quantitative temperature reconstructions Modern vegetation without distortions arising from the masking effect of beech pol- len (Newnham et al., 2013; Wilmshurst et al., 2007). Second, the The native vegetation of the Waikato lowlands has been almost relative abundance of the dominant podocarp trees can be related completely destroyed by anthropogenic clearance, and today, the to precipitation changes (McGlone and Topping, 1977). We took landscape is dominated by agriculture (Clarkson et al., 2007). Soil advantage of these features to develop pollen-based temperature and pollen analyses suggest that this region was densely covered and moisture reconstructions using quantitative methods and by mixed conifer–broadleaf forest prior to human settlement in a podocarp pollen ratio, respectively. The integration of these the 13th century (Newnham et al., 1989, 1995a). Relict forest reconstructions with other terrestrial and marine proxies is used to stands in relatively well-drained areas such as alluvial plains, provide insights into large-scale atmospheric controls on New gullies and mountain foothills feature the emergent conifers Zealand climate anomalies. Dacrydium cupressinum, Dacrycarpus dacrydioides, Podocarpus totara, Prumnopitys ferruginea and Prumnopitys taxifolia, and broadleaved trees such as Beilschmiedia tawa, Alectryon excel- Study region sus, Elaeocarpus dentatus, Metrosideros robusta, Knightia excelsa, Beilschmiedia taraire, Dysoxylum spectabile, Rhopalo- The physical setting stylis sapida and Laurelia novae-zelandiae (Clarkson et al., The Waikato
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