scholarly journals Holocene sea-level change and estuary infill in North West Nelson, central New Zealand

The Holocene ◽  
2021 ◽  
pp. 095968362110604
Author(s):  
David M Kennedy ◽  
Beth V Risdon ◽  
Josephine LD Woods
Keyword(s):  
New Zealand ◽  
Sea Level ◽  
Central Basin ◽  
Marine Transgression ◽  
The Holocene ◽  
North West ◽  
Sedimentary Sequences ◽  
The North ◽  
History Of ◽  
Holocene Sea Level

The sedimentary sequences found within estuaries in the north west Nelson region of central New Zealand are investigated in order to quantify the timing of the end of the Post Glacial Marine Transgression. This region has been identified as being relatively stable in terms of vertical tectonic movement during the Holocene, but is yet to yield any reconstructions of eustatic sea level. In this study, we investigate the Holocene infill of a barrier estuary (Parapara Inlet) through sedimentological analysis and radiocarbon dating of 18 vibracores up to 4.2 m in length. It is found that the estuary infilled through a combination of lateral flood tide and fluvial delta progradation as well as vertical central basin infill. The central basin infilled at a consistent rate of 0.4 mm/year in both the mid (7.0–6.0 ka) and late-Holocene (2.5–1.5 ka). By the time of early human (Maori) settlement (c. 1 ka), the estuary surface was at low intertidal elevations with sediment being transported from the fluvial to tidal delta. A discernible change in sedimentation rates could not be associated with Maori settlement; however, infill rates increased to at least 12.5 mm/year in the past 150 years due hydraulic sluicing associated with mining. The sedimentary history of Parapara Inlet is compared to nearby Whanganui Inlet, d’Urville Island and Nelson to establish the character of regional Holocene sea level movement. It is found that relative sea level reached modern elevations between 8 and 7 ka in the region. The similarity between sea level curves for the end of the post glacial marine transgression (PMT) to other tectonically stable sites in northern New Zealand suggests that this curve can now be considered a true eustatic signal for the New Zealand archipelago.

Holocene sea-level history of the Canadian Beaufort shelf

1993 ◽  
Vol 30 (1) ◽  
pp. 103-108 ◽  
Author(s):  
Philip R. Hill ◽  
Arnaud Héquette ◽  
Marie-Hélène Ruz
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Zone ◽  
Marine Sediments ◽  
Tidal Marsh ◽  
Relative Sea Level ◽  
The Holocene ◽  
Single Piece ◽  
History Of ◽  
Holocene Sea Level

New radiocarbon ages pertaining to the Holocene sea-level history of the Canadian Beaufort shelf are presented. The ages were obtained on samples of freshwater and tidal-marsh peat beds from offshore boreholes and shallow cores in the coastal zone and on molluscs and a single piece of wood deposited in foraminifera-bearing marine sediments. Although none of the samples record directly the position of relative sea level, the suite of ages constrains the regional curve sufficiently to suggest a faster rate of mid Holocene sea level rise (7–14 mm/a) than previously thought. The rate of relative rise slowed markedly in the last 3000 years, approaching the present at a maximum probable rate of 2.5 mm/a.

An Integrated Latest Quaternary (Stage 3 to Present) Paleoclimatic and Paleoceanographic Record from Offshore Northern New Zealand

1995 ◽  
Vol 44 (2) ◽  
pp. 283-293 ◽  
Author(s):  
Ian C. Wright ◽  
Matt S. McGlone ◽  
Campbell S. Nelson ◽  
Brad J. Pillans
Keyword(s):  
New Zealand ◽  
Sea Level ◽  
Vegetation History ◽  
Sediment Cores ◽  
Subsurface Water ◽  
Deep Sea Sediment ◽  
The Holocene ◽  
The North ◽  
Paleoclimatic Changes ◽  
Stage 4

AbstractPaleoceanographic and onshore paleoclimatic changes during the last 59,000 yr are established from three deep-sea sediment cores off northeast New Zealand using an integrated log of sediment texture, CaCO3 content, palynology, and planktonic and benthic foraminiferal δ18O and δ13C data, together with dated silicic tephras. These records from the isotopic stage 4-3 boundary to the present record northern New Zealand vegetation history, changes in a subsidiary equatorward flow of Circumpolar Deep Water, and sea-surface temperatures (SSTs) for subtropical water (STW) between latitudes 36°42′ and 35°51′S. Relative to the Holocene, isotopically derived SSTs record average changes of +2°C, -2°C, and -2°C for the 59,000-43,000, 43,000-24,000, and 24,000-12,000 yr time slices, respectively. The apparent +2°C warming for the 59,000-43,000 yr period is interpreted to reflect changes in the dominant depth habitat of Globigerina bulloides in response to upwelling. A -2°C cooling of SSTs during isotope stage 2 is interpreted, in part, to reflect upwelling of cool subsurface water resulting from strong and persistent westerly airflow across New Zealand, with the concomitant enhanced surface-water production of CaCO3. Onshore, vegetation consistent with these changes are recorded, with full conifer-hardwood forest prior to 43,000 yr, followed by a change to vegetation implying cooler and drier conditions between 43,000 and 12,000 yr, and a subsequent return to full forest during the Holocene. The sequence of biopelagic and hemipelagic sedimentation observed within these cores reflect oscillation of sea level about a threshold eustatic level that controls the transport of terrigenous detritus offshore. Local variations and interplay of the regional oceanography and morphology and tectonism of the continental shelf will dictate that, relative to present sea level, this threshold eustatic sea level will vary in depth, and hence age, along a continental margin. Data from the New Zealand region reveal an extremely steep meridional thermal gradient across the southern and central New Zealand region during the last glaciation with minor cooling of STW to the north, apart from localized nearshore upwelling zones, but pronounced cooling of subantarctic water to the south of the subtropical convergence zone.

scholarly journals Ecological-taxonomic analysis of the petrophyte flora of Ikhrek (Rutulsky district) surroundings of Republic of Dagestan

2016 ◽  
Vol 5 (4) ◽  
pp. 70-73
Author(s):  
Agarza Medzhidovich Khalidov
Keyword(s):  
Rocky Mountains ◽  
Genetic Relationships ◽  
Taxonomic Composition ◽  
Environmental Groups ◽  
North West ◽  
Taxonomic Analysis ◽  
The North ◽  
History Of ◽  
The Republic ◽  
Mountain Country

The study of petrophytes, as a peculiar group of plants, is important for understanding the history of the flora and nature in general. Their ecological characteristics, taxonomic composition, geographic and genetic relationships and other characteristics carry information about the stages of development of the mountain country and its flora. Rutulsky district is a part of Highland Dagestan and borders on the Republic of Azerbaijan in the South, Akhtynsky and Kurakhsky districts in the East, Tlyaratinsky and Charodinsky districts in the North-West, Kulinsky, Agulsky and Laksky districts of the Republic of Dagestan in the North. The relief of Highland Dagestan, which is the area of our research, is characterized by a large slope, stony and rocky mountains. The following paper contains taxonomic, biomorphic, ecological analyses of petrophyte complexes of the studied area and an analysis of endemism and relict flora of petrophytic complexes. Herbarium material has helped to find the dominant family, genera and species of petrophyte complexes of the area. Biomorphic and environmental groups of petrophyte complexes have been studied. Confinement of petrophytes to different environmental conditions has been established. Endemic, relict and protected species of petrophyte complexes have been identified.

scholarly journals Scaling up: Renewable energy on Aboriginal lands in north west Australia

2021 ◽  
Author(s):  
Brad Riley
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
Scaling Up ◽  
Benefit Sharing ◽  
Small Community ◽  
Renewable Energy Resources ◽  
North West ◽  
The North ◽  
History Of ◽  
Aboriginal Lands

This paper examines renewable energy developments on Aboriginal lands in North-West Western Australia at three scales. It first examines the literature developing in relation to large scale renewable energy projects and the Native Title Act (1993)Cwlth. It then looks to the history of small community scale standalone systems. Finally, it examines locally adapted approaches to benefit sharing in remote utility owned networks. In doing so this paper foregrounds the importance of Aboriginal agency. It identifies Aboriginal decision making and economic inclusion as being key to policy and project development in the 'scaling up' of a transition to renewable energy resources in the North-West.

scholarly journals Personal fund of hydropower engineer S. V. Grigoriev of the Museum-archive of the BCH KSC RAS

2021 ◽  
Vol 12 (4-2021) ◽  
pp. 28-36
Author(s):  
O. V. Shabalina ◽  
◽  
K. S. Kazakova ◽  
Keyword(s):  
Scientific Study ◽  
Water Bodies ◽  
The Arctic ◽  
Biographical Information ◽  
North West ◽  
The North ◽  
European North ◽  
Potential Sources ◽  
History Of

The article presents materials from the personal fund of the largest hydropower engineer of the North-West of the USSR S. V. Grigoriev, belonging to the Museum-Archive of History of Studying and Exploration of the European North of the Barents Centre of Humanities of the KSC RAS. The personal documents of the scientist and the practitioner are sources of biographical information given in the article and potential sources for research in the field of the history of the scientific study of water bodies, rivers and the development of hydropower in the Arctic.

scholarly journals The ethnic composition of the population of Prinevye area and the Southern Ladoga area at the end of the XV century

2020 ◽  
Vol 12 (1) ◽  
pp. 62-72
Author(s):  
Boris I. Chibisov
Keyword(s):  
Economic History ◽  
Ethnic Composition ◽  
Rural Settlements ◽  
North West ◽  
Introduction History ◽  
The North ◽  
History Of ◽  
The Baltic ◽  
North Western ◽  
Descriptive Method

Introduction. History of the North-West area of Novgorod land at the end of the XV century attracted the attention of researchers mainly in the socio-economic aspect. This is due to the fact that Novgorod scribal books are dated by the end of the XV century. From the standpoint of socio-economic history their value is not in doubt, but from an ethno-historical point their onomastic content is underestimated. Materials and methods. The main source of research was the scribe book of the Vodskaya Pyatina 1499/1500. The descriptive method of research is to identify and record the Baltic-Finnish oikonyms (names of rural settlements) and anthroponyms mentioned in the scribe books. Baltic-Finnish anthroponyms are identified on the basis of an analysis of formal indicators of borrowing the anthroponyms. Results and Discussion. There are several areas where the Baltic-Finnish oikonymy and anthroponymy were concentrated, namely Korboselsky graveyard in the northern Prinevye, Lopsky and Terebuzhsky graveyards in the southern Ladoga, as well as Dudorovsky and Izhora graveyards south of the Neva. Archaeological sources record a significant presence of the Izhora antiquities. The presence of Karelians is noted in the northern Prievye and southern Ladoga. Slavic onomastic materials are recorded throughout Orekhovsky and Ladoga counties, but to mostly in the cities of Oreshka, Ladoga and their nearest areas. Conclusion. By the end of the XV century the north-western graveyards of Novgorod land were inhabited by representatives of various ethnic groups: Slavs, Vodians, Izhora and Karelians, as evidenced by the data of anthroponyms and toponyms of the scribe’s books and confirmed by archaeological sources.

Dinocysts as a Tool for Palaeoenvironmental Reconstruction in Vitória Bay, Brazil

Radiocarbon ◽  
2020 ◽  
Vol 62 (2) ◽  
pp. 289-311
Author(s):  
Alex da Silva de Freitas ◽  
Javier Helenes Escamilla ◽  
Cintia Ferreira Barreto ◽  
Alex Cardoso Bastos ◽  
Estefan Monteiro da Fonseca ◽  
...  
Keyword(s):  
Sea Level ◽  
Saline Water ◽  
Sediment Cores ◽  
Isotopic Analysis ◽  
Southeastern Brazil ◽  
Geochemical Data ◽  
Estuarine System ◽  
Marine Transgression ◽  
The Holocene ◽  
Energy Environment

ABSTRACTMicropaleontological and geochemical data were applied to sediments from southeastern Brazil to study the hydrodynamics associated with the Holocene sea level rise. Sediment cores were taken around Vitória Bay, examined for dinoflagellate cysts and subjected to isotopic analysis. The cyst assemblage mainly dominated by autotrophic species most notably O. centrocarpum, L. machaerophorum and T. vancampoae. The influence of the marine transgression and subsequent regression observed during the Holocene along the coast of Brazil could have initially favored the establishment of an oligotrophic and higher energy environment. The inflow of continental water from tributaries combined with a higher inflow of saline water into the estuarine system could have favored the establishment and subsequent deposition of the dinocysts.

scholarly journals Late Holocene sea-level changes and vertical land movements in New Zealand

2020 ◽  
pp. 1-16
Author(s):  
Daniel J. King ◽  
Rewi M. Newnham ◽  
W. Roland Gehrels ◽  
Kate J. Clark
Keyword(s):  
New Zealand ◽  
Sea Level ◽  
Late Holocene ◽  
Sea Level Changes ◽  
Holocene Sea Level
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