Seasonality variations in the Central Mediterranean during climate change events in the Late Holocene

2015 ◽  
Vol 418 ◽  
pp. 304-318 ◽  
Author(s):  
M-L. S. Goudeau ◽  
G.-J. Reichart ◽  
J.C. Wit ◽  
L.J. de Nooijer ◽  
A.-L. Grauel ◽  
...  
2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sofia Ribeiro ◽  
Audrey Limoges ◽  
Guillaume Massé ◽  
Kasper L. Johansen ◽  
William Colgan ◽  
...  

AbstractHigh Arctic ecosystems and Indigenous livelihoods are tightly linked and exposed to climate change, yet assessing their sensitivity requires a long-term perspective. Here, we assess the vulnerability of the North Water polynya, a unique seaice ecosystem that sustains the world’s northernmost Inuit communities and several keystone Arctic species. We reconstruct mid-to-late Holocene changes in sea ice, marine primary production, and little auk colony dynamics through multi-proxy analysis of marine and lake sediment cores. Our results suggest a productive ecosystem by 4400–4200 cal yrs b2k coincident with the arrival of the first humans in Greenland. Climate forcing during the late Holocene, leading to periods of polynya instability and marine productivity decline, is strikingly coeval with the human abandonment of Greenland from c. 2200–1200 cal yrs b2k. Our long-term perspective highlights the future decline of the North Water ecosystem, due to climate warming and changing sea-ice conditions, as an important climate change risk.


2017 ◽  
Vol 13 (4) ◽  
pp. 345-358 ◽  
Author(s):  
Marília C. Campos ◽  
Cristiano M. Chiessi ◽  
Ines Voigt ◽  
Alberto R. Piola ◽  
Henning Kuhnert ◽  
...  

Abstract. Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (δ13C), i.e. δ13CO2atm, presumably due to outgassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present δ13C records from two species of planktonic foraminifera from the western South Atlantic that reveal major decreases (up to 1 ‰) during Heinrich Stadials 3 and 2. These δ13C decreases are most likely related to millennial-scale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (δ13CO2atm). We hypothesise two mechanisms that could account for the decreases observed in our records, namely strengthening of Southern Ocean deep-water ventilation and weakening of the biological pump. Additionally, we suggest that air–sea gas exchange could have contributed to the observed δ13C decreases. Together with other lines of evidence, our data are consistent with the hypothesis that the CO2 added to the atmosphere during abrupt millennial-scale climate change events of the last glacial period also originated in the ocean and reached the atmosphere by outgassing. The temporal evolution of δ13C during Heinrich Stadials 3 and 2 in our records is characterized by two relative minima separated by a relative maximum. This w structure is also found in North Atlantic and South American records, further suggesting that such a structure is a pervasive feature of Heinrich Stadial 2 and, possibly, also Heinrich Stadial 3.


2022 ◽  
Vol 278 ◽  
pp. 107376
Author(s):  
Matthew S. Finkenbinder ◽  
Byron A. Steinman ◽  
Broxton W. Bird ◽  
Ellen C. Heilman ◽  
Alexandria R. Aspey ◽  
...  

2017 ◽  
Vol 8 (3) ◽  
pp. 171-182 ◽  
Author(s):  
Bonaventure N. Nwokeoma ◽  
Amadi Kingsley Chinedu

Abstract Climate change discussion has primarily focused on the physical manifestation, mitigation, adaptation and finance issues. However, little attention is given to the social consequences of climate change impact especially its relationship to crime in society. Specifically, little or no research has been focused on its impact on crime, especially in developing societies. This study which examined the impact of climate change and its consequences on crime specifically terrorist activities in the Northeast of Nigeria is an effort to fill this research gap. The study adopted a cross-aged design which involves in depth interview of 200 farmers in four selected states of the zone. The outcome is that climate change awareness in the zone is very low. The climate change events identified are rapid desertification, excessive heat and drought. The consequence is that most farmers lost farmlands and agricultural products to these climate change events. Also most of the farmers who are youths were rendered redundant due to the negative impact of these climate events on crops and agriculture. Consequently they engage in alternative activities like menial jobs, while some engage in criminal activities like drug addiction, theft, political thugery, armed robbery, kidnapping and terrorism. They become ready tools for recruitment by Boko-Haram terrorists who are active in the area. It is recommended that massive enlightenment and effective mitigation program should be conducted, youth who are not in school should be convinced to embrace education. Also measures and projects to re-engage the youths back to agriculture should be promoted.


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Bogdan P. Onac ◽  
Steven M. Baumann ◽  
Dylan S. Parmenter ◽  
Eric Weaver ◽  
Tiberiu B. Sava

AbstractWater availability for Native Americans in the southwestern United States during periods of prolonged droughts is poorly understood as regional hydroclimate records are scant or contradicting. Here, we show that radiocarbon-dated charcoal recovered from an ice deposit accumulated in Cave 29, western New Mexico, provide unambiguous evidence for five drought events that impacted the Ancestral Puebloan society between ~ AD 150 and 950. The presence of abundant charred material in this cave indicates that they periodically obtained drinking water by using fire to melt cave ice, and sheds light on one of many human–environment interactions in the Southwest in a context when climate change forced growing Ancestral Puebloan populations to exploit water resources in unexpected locations. The melting of cave ice under current climate conditions is both uncovering and threatening a fragile source of paleoenvironmental and archaeological evidence of human adaptations to a seemingly marginal environment.


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