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Rewi M. Newnham
Victoria University of Wellington
GeomorphologyGeologyClimate changeHoloceneClimatology
128Publications
41H-index
5,342Citations
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Publications 131
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In palynology and other laboratory-based disciplines, methodological literature often lags the development and adoption of new practices. Here we highlight the lack of literature on the application of heavy liquid density separation for pollen preparations, a technique that has become common practice in recent years. In a study of Holocene-age sediments from Lake Pupuke, northern New Zealand, we found that the density of the heavy liquid used to separate pollen from the minerogenic fraction, wit...
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#1Ignacio A. Jara (Victoria University of Wellington)H-Index: 3
#2Patricio I. Moreno (University of Chile)H-Index: 36
Last. Rewi M. Newnham (Victoria University of Wellington)H-Index: 41
view all 4 authors...
Abstract Paleoecological studies from the northern Patagonian Andes (40–44°S) have identified past changes in vegetation, fire regimes and paleoclimate since the last glaciation, including variations in strength and position of the Southern Westerly Winds (SWW). The extent to which records west and east of the Andes provide a congruent paleoclimatic history, however, has not been explored in detail in the literature. Physical and biological contrasts are evident between these regions today and a...
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#1Rewi M. Newnham (Victoria University of Wellington)H-Index: 41
#2Zoe Hazell (Historic England)H-Index: 1
Last. Ignacio A. JaraH-Index: 3
view all 10 authors...
Abstract In comparison with temperature reconstructions, New Zealand proxy records for paleo-precipitation are rare, despite the importance of precipitation in contemporary climate variability and for projected climate impacts. In this study, records of mid-late Holocene palaeomoisture variation were derived for two hydrologically separate ombrotrophic Restionaceae bogs in northern New Zealand, based on peat humification analysis. At each site, three cores were analysed for peat humification, fa...
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#1Mike Walker (Aberystwyth University)H-Index: 32
#2Martin J. Head (Brock University)H-Index: 37
Last. Harvey Weiss (Yale University)H-Index: 17
view all 13 authors...
The Holocene, which currently spans ~11 700 years, is the shortest series/epoch within the geological time scale (GTS), yet it contains a rich archive of evidence in stratigraphical contexts that are frequently continuous and often preserved at high levels of resolution. On 14 June 2018, the Executive Committee of the International Union of Geological Sciences formally ratified a proposal to subdivide the Holocene into three stages/ages, along with their equivalent subseries/subepochs, each anch...
7 CitationsSource
#1Mike Walker (Aberystwyth University)H-Index: 32
#2Phil Gibbard (University of Cambridge)H-Index: 4
Last. Harvey Weiss (Yale University)H-Index: 17
view all 14 authors...
The Holocene Series/Epoch is the most recent series/epoch in the geological timescale, spanning the interval from 11,700 yr to the present day. Together with the subadjacent Pleistocene, it comprises the Quaternary System/Period. The Holocene record contains diverse geomorphological, biological, climatological and archaeological evidence, within sequences that are often continuous and extremely well-preserved at decadal, annual and even seasonal resolution. As a consequence, the Holocene is perh...
2 CitationsSource
#1Mike Walker (Aberystwyth University)H-Index: 32
#2Martin J. Head (Brock University)H-Index: 37
Last. Harvey Weiss (Yale University)H-Index: 17
view all 13 authors...
The Holocene is probably the most intensively studied series/epoch within the geological record, and embodies a wide array of geomorphological, climatic, biotic and archaeological evidence; yet little attention has hitherto been paid to a formal subdivision of this series/epoch. Here we report a tripartite division of the Holocene into the Greenlandian, Northgrippian and Meghalayan stages/ages and their corresponding Lower/Early, Middle, Upper/Late subseries/subepochs, each supported by a Global...
22 CitationsSource
#1Valerie van den Bos (Victoria University of Wellington)H-Index: 1
#2Andrew B. H. Rees (Victoria University of Wellington)H-Index: 9
Last. Paul Augustinus (University of Auckland)H-Index: 22
view all 6 authors...
Abstract The Holocene thermal maximum (HTM) is a spatio-temporally variable period of generally warmer conditions during the early and middle Holocene that is often used as an analogue for future climate change. Global scale climate reconstructions and models tend to smooth out the variations and complexity of the HTM and inconsistencies between reconstructions from different locations and proxies are often attributed to bias arising from different locations or proxies. We use these differences ...
3 CitationsSource
#2Janet M. WilmshurstH-Index: 37
Last. Rewi M. NewnhamH-Index: 41
view all 5 authors...
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#1Rakhesh Devadas (UTS: University of Technology, Sydney)H-Index: 9
#2Alfredo Huete (UTS: University of Technology, Sydney)H-Index: 65
Last. Janet M. Davies (QUT: Queensland University of Technology)H-Index: 21
view all 16 authors...
Allergic diseases, including respiratory conditions of allergic rhinitis (hay fever) and asthma, affect up to 500 million people worldwide. Grass pollen are one major source of aeroallergens globally. Pollen forecast methods are generally site-based and rely on empirical meteorological relationships and/or the use of labour-intensive pollen collection traps that are restricted to sparse sampling locations. The spatial and temporal dynamics of the grass pollen sources themselves, however, have re...
4 CitationsSource
#1Rewi M. Newnham (Victoria University of Wellington)H-Index: 41
#2David J. Lowe (University of Waikato)H-Index: 41
Last. Paul Augustinus (University of Auckland)H-Index: 22
view all 4 authors...
Following resolution of a long-standing debate over the timing of the initial settlement of New Zealand from Polynesia (late 13th century), a prevailing paradigm has developed that invokes rapid transformation of the landscape, principally by fire, within a few decades of the first arrivals. This model has been constructed from evidence mostly from southern and eastern regions of New Zealand, but a more complicated pattern may apply in the more humid western and northern regions where forests ar...
8 CitationsSource
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