title: The environmental significance of natural nanoparticles

authors: Hartland, Adam

abstract: Natural water-borne nanoparticles are ubiquitous. Their very small size, ranging from 1 to 100 nanometers means they are both highly mobile and chemically reactive. Nanoparticles are central in buffering environmental systems, serving the dual role of limiting potentially toxic metal concentrations, while at the same time providing a supply of metals at levels that enables biochemical reactions to take place.

text: The environmental significance of natural nanoparticles Natural water-borne nanoparticles are ubiquitous. Their very small size, ranging from 1 to 100 nanometers means they are both highly mobile and chemically reactive. Nanoparticles are central in buffering environmental systems, serving the dual role of limiting potentially toxic metal concentrations, while at the same time providing a supply of metals at levels that enables biochemical reactions to take place.

year: 2013

title: Towards a climate event stratigraphy for New Zealand over the past 30,000 years (NZ-INTIMATE project)

authors: Alloway, Brent V.

subjects: Last glacial coldest period

abstract: It is widely recognised that the acquisition of high-resolution palaeoclimate records from southern mid-latitude sites is essential for establishing a coherent picture of inter-hemispheric climate change and for better understanding of the role of Antarctic climate dynamics in the global climate system. New Zealand is considered to be a sensitive monitor of climate change because it is one of a few sizeable landmasses in the Southern Hemisphere westerly circulation zone, a critical transition zone between subtropical and Antarctic influences. New Zealand has mountainous axial ranges that amplify the climate signals and, consequently, the environmental gradients are highly sensitive to subtle changes in atmospheric and oceanic conditions. Since 1995, INTIMATE has, through a series of international workshops, sought ways to improve procedures for establishing the precise ages of climate events, and to correlate them with high precision, for the last 30 000 calendar years. The NZ-INTIMATE project commenced in late 2003, and has involved virtually the entire New Zealand palaeoclimate community. Its aim is to develop an event stratigraphy for the New Zealand region over the past 30 000 years, and to reconcile these events against the established climatostratigraphy of the last glacial cycle which has largely been developed from Northern Hemisphere records (e.g. Last Glacial Maximum (LGM), Termination I, Younger Dryas). An initial outcome of NZ-INTIMATE has been the identification of a series of well-dated, high-resolution onshore and offshore proxy records from a variety of latitudes and elevations on a common calendar timescale from 30 000 cal. yr BP to the present day. High-resolution records for the last glacial coldest period (LGCP) (including the LGM sensu stricto) and last glacial-interglacial transition (LGIT) from Auckland maars, Kaipo and Otamangakau wetlands on eastern and central North Island, marine core MD97-2121 east of southern North Island, speleothems on northwest South Island, Okarito wetland on southwestern South Island, are presented. Discontinuous (fragmentary) records comprising compilations of glacial sequences, fluvial sequences, loess accumulation, and aeolian quartz accumulation in an andesitic terrain are described. Comparisons with ice-core records from Antarctica (EPICA Dome C) and Greenland (GISP2) are discussed. A major advantage immediately evident from these records apart from the speleothem record, is that they are linked precisely by one or more tephra layers. Based on these New Zealand terrestrial and marine records, a reasonably coherent, regionally applicable, sequence of climatically linked stratigraphic events over the past 30 000 cal. yr is emerging. Three major climate events are recognised: (1) LGCP beginning at ca. 28 000 cal. yr BP, ending at Termination I, ca. 18 000 cal. yr BP, and including a warmer and more variable phase between ca. 27 000 and 21 000 cal. yr BP, (2) LGIT between ca. 18 000 and 11 600 cal. yr BP, including a Lateglacial warm period from ca. 14 800 to 13 500 cal. yr BP and a Lateglacial climate reversal between ca. 13 500 and 11 600 cal. yr BP, and (3) Holocene interglacial conditions, with two phases of greatest warmth between ca. 11 600 and 10 800 cal. yr BP and from ca. 6 800 to 6 500 cal. yr BP. Some key boundaries coincide with volcanic tephras.

text: Towards a climate event stratigraphy for New Zealand over the past 30,000 years (NZ-INTIMATE project) It is widely recognised that the acquisition of high-resolution palaeoclimate records from southern mid-latitude sites is essential for establishing a coherent picture of inter-hemispheric climate change and for better understanding of the role of Antarctic climate dynamics in the global climate system. New Zealand is considered to be a sensitive monitor of climate change because it is one of a few sizeable landmasses in the Southern Hemisphere westerly circulation zone, a critical transition zone between subtropical and Antarctic influences. New Zealand has mountainous axial ranges that amplify the climate signals and, consequently, the environmental gradients are highly sensitive to subtle changes in atmospheric and oceanic conditions. Since 1995, INTIMATE has, through a series of international workshops, sought ways to improve procedures for establishing the precise ages of climate events, and to correlate them with high precision, for the last 30 000 calendar years. The NZ-INTIMATE project commenced in late 2003, and has involved virtually the entire New Zealand palaeoclimate community. Its aim is to develop an event stratigraphy for the New Zealand region over the past 30 000 years, and to reconcile these events against the established climatostratigraphy of the last glacial cycle which has largely been developed from Northern Hemisphere records (e.g. Last Glacial Maximum (LGM), Termination I, Younger Dryas). An initial outcome of NZ-INTIMATE has been the identification of a series of well-dated, high-resolution onshore and offshore proxy records from a variety of latitudes and elevations on a common calendar timescale from 30 000 cal. yr BP to the present day. High-resolution records for the last glacial coldest period (LGCP) (including the LGM sensu stricto) and last glacial-interglacial transition (LGIT) from Auckland maars, Kaipo and Otamangakau wetlands on eastern and central North Island, marine core MD97-2121 east of southern North Island, speleothems on northwest South Island, Okarito wetland on southwestern South Island, are presented. Discontinuous (fragmentary) records comprising compilations of glacial sequences, fluvial sequences, loess accumulation, and aeolian quartz accumulation in an andesitic terrain are described. Comparisons with ice-core records from Antarctica (EPICA Dome C) and Greenland (GISP2) are discussed. A major advantage immediately evident from these records apart from the speleothem record, is that they are linked precisely by one or more tephra layers. Based on these New Zealand terrestrial and marine records, a reasonably coherent, regionally applicable, sequence of climatically linked stratigraphic events over the past 30 000 cal. yr is emerging. Three major climate events are recognised: (1) LGCP beginning at ca. 28 000 cal. yr BP, ending at Termination I, ca. 18 000 cal. yr BP, and including a warmer and more variable phase between ca. 27 000 and 21 000 cal. yr BP, (2) LGIT between ca. 18 000 and 11 600 cal. yr BP, including a Lateglacial warm period from ca. 14 800 to 13 500 cal. yr BP and a Lateglacial climate reversal between ca. 13 500 and 11 600 cal. yr BP, and (3) Holocene interglacial conditions, with two phases of greatest warmth between ca. 11 600 and 10 800 cal. yr BP and from ca. 6 800 to 6 500 cal. yr BP. Some key boundaries coincide with volcanic tephras.

year: 2007-01

title: Accommodating multiculturalism and biculturalism in Aotearoa New Zealand: implication for language education.

authors: May, Stephen

subjects: bilingual education

abstract: The field of language education in Aotearoa New Zealand, as elsewhere, has developed significantly since its early and almost exclusive focus on the acquisition of English literacy in schools. As the field has expanded, so too has the range of language education sectors addressed and the theoretical approaches and understandings employed in relation to language and literacy education. Both developments have resulted in a more coordinated literacy education policy - exemplified to date most clearly in the New Zealand Literacy Taskforce - and a more situated, less monolithic understanding of the widely different literacies available to learners. Despite these developments, however, one area still remains noticeably under-theorised and marginalized in relation to the ongoing development of language and literacy education policy in Aotearoa New Zealand - the place of second language learners within it. This paper explores this lacuna and the potential policy implications of addressing and integrating first and second language educational concerns within an evolving national literacy education policy. This has particular implications for the further development of bilingual education - both for Maori and, possibly, other minority groups - and for the related possibilities of multicultural education. It also requires a wider and clearer recognition of minority language education rights, as developed within both international law and political theory, in order to apply these rights appropriately to an Aotearoa New Zealand context which is currently witnessing rapid and extensive demographic (and linguistic) change.

text: Accommodating multiculturalism and biculturalism in Aotearoa New Zealand: implication for language education. The field of language education in Aotearoa New Zealand, as elsewhere, has developed significantly since its early and almost exclusive focus on the acquisition of English literacy in schools. As the field has expanded, so too has the range of language education sectors addressed and the theoretical approaches and understandings employed in relation to language and literacy education. Both developments have resulted in a more coordinated literacy education policy - exemplified to date most clearly in the New Zealand Literacy Taskforce - and a more situated, less monolithic understanding of the widely different literacies available to learners. Despite these developments, however, one area still remains noticeably under-theorised and marginalized in relation to the ongoing development of language and literacy education policy in Aotearoa New Zealand - the place of second language learners within it. This paper explores this lacuna and the potential policy implications of addressing and integrating first and second language educational concerns within an evolving national literacy education policy. This has particular implications for the further development of bilingual education - both for Maori and, possibly, other minority groups - and for the related possibilities of multicultural education. It also requires a wider and clearer recognition of minority language education rights, as developed within both international law and political theory, in order to apply these rights appropriately to an Aotearoa New Zealand context which is currently witnessing rapid and extensive demographic (and linguistic) change.

year: 2002