scholarly journals Climate and Environmental Change in the SW-Pacific of the Last ~14, 000 Years Using Lipid Biomarkers in Sediments of a New Zealand Lake

2020 ◽  
Author(s):  
Sebastian Naeher ◽  
Thorsten Bauersachs ◽  
Valerie K. Stucker ◽  
Jonathan Puddick ◽  
Susanna A. Wood ◽  
...  
Keyword(s):  
New Zealand ◽  
Environmental Change ◽  
Lipid Biomarkers ◽  
Climate And Environmental Change ◽  
Sw Pacific

The effect of climate and environmental change on the megafaunal moa of New Zealand in the absence of humans

2012 ◽  
Vol 50 ◽  
pp. 141-153 ◽  
Author(s):  
Nicolas J. Rawlence ◽  
Jessica L. Metcalf ◽  
Jamie R. Wood ◽  
Trevor H. Worthy ◽  
Jeremy J. Austin ◽  
...  
Keyword(s):  
New Zealand ◽  
Environmental Change ◽  
Climate And Environmental Change

scholarly journals Strengthening Multidisciplinary Research on Climate and Environmental Change

Eos ◽  
2014 ◽  
Vol 95 (34) ◽  
pp. 307-307
Author(s):  
Tom Beer ◽  
Jianping Li ◽  
Keith Alverson
Keyword(s):  
Environmental Change ◽  
Multidisciplinary Research ◽  
Climate And Environmental Change

Future water-related risks and management options in the Mediterranean basin 

2021 ◽  
Author(s):  
Marianela Fader ◽  
Carlo Giupponi ◽  
Selmin Burak ◽  
Hamouda Dakhlaoui ◽  
Aristeidis Koutroulis ◽  
...  
Keyword(s):  
Environmental Change ◽  
Water Use ◽  
Mediterranean Basin ◽  
Demand Management ◽  
Climate And Environmental Change ◽  
Mediterranean Countries ◽  
The Future ◽  
Use Efficiency ◽  
The Mediterranean ◽  
The Mediterranean Basin

<p>The presentation will summarize the main findings of the chapter “Water”[1] of the report “Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future”. This report was published in November 2020 and prepared by 190 scientists from 25 countries, who belong to the scientific network “Mediterranean Experts on Climate and Environmental Change”.</p><p>Water resources in the Mediterranean are scarce, unevenly distributed and often mismatching human and environmental needs. Approx. 180 million people in the southern and eastern Mediterranean countries suffer from water scarcity (<1000 m<sup>3</sup> capita<sup>-1</sup> yr<sup>-1</sup>). The main water use is for agriculture, and more specifically on the southern and eastern rim. Water demand for both tourism and agriculture peak in summer, potentially enhancing conflicts in the future. Municipal water use is particularly constrained in the south and will likely be exacerbated in the future by demographic and migration phenomena. Northern countries face additional risks in flood prone areas where urban settlements are rapidly increasing.</p><p>Climate change, in combination with demographic and socio-economic developments, has mainly negative consequences for the water cycle in the Mediterranean Basin, including reduced runoff and groundwater recharge, increased crop water requirements, increased conflicts among users, and increased risk of overexploitation and degradation. These impacts will be particularly severe for global warming higher than 2°C.</p><p>Adequate water supply and demand management offers some options to cope with risks. Technical solutions are available for improving water use efficiency and productivity, and increasing reuse. Seawater desalination is increasingly used as adaptation measure to reduce (potable) water scarcity in dry Mediterranean countries, despite known drawbacks in terms of environmental impacts and energy requirements. Promising solar technologies are under development, potentially reducing emissions and costs. Reuse of wastewater is a solution for agriculture and industrial activities but also recharge of aquifers. Inter-basin transfers may lead to controversies and conflicts. Construction of dams contributes to the reduction of water and energy scarcities, but with trade-offs in terms of social and environmental impacts.</p><p>Overall, water demand management, which increases water use efficiency and reduces water losses, is crucial for water governance for a sustainable development. Maintaining Mediterranean diet or coming back to it on the basis of locally produced foods and reducing food wastes may save water but also carbon emissions while having nutritional and health benefits.</p><div><br><div> <p>[1] <strong>Fader M.</strong>, Giupponi C., Burak S., Dakhlaoui H., Koutroulis A., Lange M.A., Llasat M.C., Pulido-Velazquez D., Sanz-Cobeña A. (2020): Water. In: Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future. First Mediterranean Assessment Report [Cramer W, Guiot J, Marini K (eds.)] Union for the Mediterranean, Plan Bleu, UNEP/MAP, Marseille, France, 57pp, in press. Download</p> </div> </div>

scholarly journals Progress in the application of lake sediment DNA in climate and environmental change and ecosystem response

2021 ◽  
Vol 33 (3) ◽  
pp. 653-666
Author(s):  
Ma Rui ◽  
◽  
Chen Jianhui ◽  
Liu Jianbao ◽  
Yuan Yanli ◽  
...  
Keyword(s):  
Environmental Change ◽  
Lake Sediment ◽  
Ecosystem Response ◽  
Climate And Environmental Change

An Archaeomagnetic Study of Hangi Stones in New Zealand

2021 ◽  
Author(s):  
◽  
Rimpy Kinger
Keyword(s):  
New Zealand ◽  
Radiocarbon Dating ◽  
Principal Component ◽  
Blocking Temperature ◽  
Radiocarbon Dates ◽  
The North ◽  
Sw Pacific ◽  
Archaeomagnetic Dating ◽  
Show Evidence ◽  
Temperature Spectra

<p>Burnt or fired archaeological artefacts often retain a record of the magnetic field in which they were last heated and cooled. Over the past four years we have collected oriented hangi stones from 10 archaeological sites spread across the North and South Islands of New Zealand. The stones vary in lithology from andesites, originating from the central North Island volcanoes, favoured by Maori for their durability and with remanent magnetization up to 30 A/m, to sandstones and schists from the main axial ranges, with magnetizations as weak as 10-4 A/m. Radiocarbon dating of charcoal fragments retrieved from amongst the stones indicates that the sites span from ca. 1400 AD to the present.  In all cases, we have independently oriented and retrieved several stones, and we have made several samples from each stone, either by drilling (standard cylindrical samples) or sawing (pseudo-cubes) in the laboratory. We have calculated site mean palaeomagnetic directions (Dec between 1.5o and 19.6o and Inc between -52.2o and -68.3o) from principal component analysis of thermal demagnetization and alternating field demagnetization data, discarding the data of stones that show evidence of disturbance after cooling. The directions are in good agreement with recently published palaeosecular variation records from lake sediments. We have carried out palaeointensity experiments using the Coe/Thellier method with pTRM and tail checks, and with selection criteria modified to the situation. Palaeointensities range from 50μT to 77μT. Rock magnetic experiments contribute to our understanding of the mineralogy, domain state and blocking temperature spectra.  We compare our data with predictions of the global field models ARCH3k and gufm1, and suggest that the addition of our new data will improve these models for the SW Pacific region for the most recent time period. Archaeomagnetic measurements are also used to date hangi sites by matching the palaeo-direction to an established archaeomagnetic dating model, NZPSV1k. Archaeomagnetic dating is used to resolve ambiguities in the calibration of radiocarbon dates, and shows up inconsistencies due to unreliable source material for radiocarbon dating. Archaeomagnetic dating and radiocarbon dating results are combined to give the best estimates of the best age of the hangi sites.</p>

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