title: Punctuated shutdown of Atlantic Meridional Overturning circulation during Greenland Stadial 1

authors: Hogg, Alan G.

abstract: The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling, thought to have been initiated by North America fresh water runof that caused a sustained reduction of North Atlantic Meridional Overturning Circulation (AMOC), resulting in an antiphase temperature response between the hemispheres (the ‘bipolar seesaw’). Here we exploit sub-fossil New Zealand kauri trees to report the frst securely dated, decadally-resolved atmospheric radiocarbon (¹⁴C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring ¹⁴C records with marine ¹⁴C sequences we document two relatively short periods of AMOC collapse during the stadial, at ~12,920-12,640 cal BP and 12,050-11,900 cal BP. In addition, our data show that the interhemispheric atmospheric ¹⁴C ofset was close to zero prior to GS-1, before reaching ‘near-modern’ values at ~12,660 cal BP, consistent with synchronous recovery of overturning in both hemispheres and increased Southern Ocean ventilation. Hence, sustained North Atlantic cooling across GS-1 was not driven by a prolonged AMOC reduction but probably due to an equatorward migration of the Polar Front, reducing the advection of southwesterly air masses to high latitudes. Our fndings suggest opposing hemispheric temperature trends were driven by atmospheric teleconnections, rather than AMOC changes.

text: Punctuated shutdown of Atlantic Meridional Overturning circulation during Greenland Stadial 1 The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling, thought to have been initiated by North America fresh water runof that caused a sustained reduction of North Atlantic Meridional Overturning Circulation (AMOC), resulting in an antiphase temperature response between the hemispheres (the ‘bipolar seesaw’). Here we exploit sub-fossil New Zealand kauri trees to report the frst securely dated, decadally-resolved atmospheric radiocarbon (¹⁴C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring ¹⁴C records with marine ¹⁴C sequences we document two relatively short periods of AMOC collapse during the stadial, at ~12,920-12,640 cal BP and 12,050-11,900 cal BP. In addition, our data show that the interhemispheric atmospheric ¹⁴C ofset was close to zero prior to GS-1, before reaching ‘near-modern’ values at ~12,660 cal BP, consistent with synchronous recovery of overturning in both hemispheres and increased Southern Ocean ventilation. Hence, sustained North Atlantic cooling across GS-1 was not driven by a prolonged AMOC reduction but probably due to an equatorward migration of the Polar Front, reducing the advection of southwesterly air masses to high latitudes. Our fndings suggest opposing hemispheric temperature trends were driven by atmospheric teleconnections, rather than AMOC changes.

year: 2016

title: Greenpeace, political purposes – “There and back again”; Reflections on New Zealand charity law

authors: Chevalier-Watts, Juliet

subjects: charity

abstract: The political purpose doctrine, a key part of the charity law landscape for many common law jurisdictions, has been subject to much judicial and academic criticism over the years. Its continued influence on the charity sector in relation to whether or not charities can operate effectively, or indeed, whether they may lose their registered status, gives rise still to such criticisms. It is against this backdrop that this article critically assesses the doctrine in light of newly-emerging decisions from the New Zealand courts that have fundamentally changed the charity law landscape from a national perspective, and considers some of the issues associated withthis newly-evolved doctrine. Thus, what can besaidisthatNewZealandcharity law jurisprudence is evolving and this article provides some useful insights in to contemporary charity law issues predominantly through the New Zealand lens as but one legal approach, and also compares some of these issues against two international perspectives.

text: Greenpeace, political purposes – “There and back again”; Reflections on New Zealand charity law The political purpose doctrine, a key part of the charity law landscape for many common law jurisdictions, has been subject to much judicial and academic criticism over the years. Its continued influence on the charity sector in relation to whether or not charities can operate effectively, or indeed, whether they may lose their registered status, gives rise still to such criticisms. It is against this backdrop that this article critically assesses the doctrine in light of newly-emerging decisions from the New Zealand courts that have fundamentally changed the charity law landscape from a national perspective, and considers some of the issues associated withthis newly-evolved doctrine. Thus, what can besaidisthatNewZealandcharity law jurisprudence is evolving and this article provides some useful insights in to contemporary charity law issues predominantly through the New Zealand lens as but one legal approach, and also compares some of these issues against two international perspectives.

year: 2022-12-21

title: The contested shift to a bicultural understanding of place heritage in Aotearoa New Zealand

authors: Passey, Emma

abstract: This article explores contemporary threads in the heritage history of Aotearoa New Zealand, as we witness in real-time the emergence of alternative narratives of Indigenous heritage, in contrast to those of Western dominated modernity and colonial hegemony. Moves to actively decolonise heritage studies is creating shifts in the bicultural understanding of culture and heritage to overtly include place heritage. As this new framing emerges, wider acknowledgement of the significance of Māori heritage landscapes is growing. This is explored here in a series of four case-studies. Each account illustrates how Indigenous Māori voices have gained momentum, and reinforces how Aotearoa New Zealand is transitioning to greater bicultural appreciation through inclusion, changes in social and cultural conventions, and new interpretations of dominant narratives using tools like critical heritage studies and existing legal conventions. This evolution of heritage values is not without repeated contestation, however. Positively, increasing numbers of settler-Pākehā (non-Māori) as well as those colonised, no longer believe or accept the histories previously told. Much needed, robust, and sometimes difficult discussions are taking place, enabling New Zealanders to reconsider the significance of what heritage means to all its people.

text: The contested shift to a bicultural understanding of place heritage in Aotearoa New Zealand This article explores contemporary threads in the heritage history of Aotearoa New Zealand, as we witness in real-time the emergence of alternative narratives of Indigenous heritage, in contrast to those of Western dominated modernity and colonial hegemony. Moves to actively decolonise heritage studies is creating shifts in the bicultural understanding of culture and heritage to overtly include place heritage. As this new framing emerges, wider acknowledgement of the significance of Māori heritage landscapes is growing. This is explored here in a series of four case-studies. Each account illustrates how Indigenous Māori voices have gained momentum, and reinforces how Aotearoa New Zealand is transitioning to greater bicultural appreciation through inclusion, changes in social and cultural conventions, and new interpretations of dominant narratives using tools like critical heritage studies and existing legal conventions. This evolution of heritage values is not without repeated contestation, however. Positively, increasing numbers of settler-Pākehā (non-Māori) as well as those colonised, no longer believe or accept the histories previously told. Much needed, robust, and sometimes difficult discussions are taking place, enabling New Zealanders to reconsider the significance of what heritage means to all its people.

year: 2023-01-01