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2021 (4)

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Dissertation
Marine heatwaves offshore Central and South Chile: a global assessment and the case study of the year 2016
Authors: --- --- --- --- --- et al.
Year: 2021 Publisher: Liège Université de Liège (ULiège)

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Abstract

Marine heatwaves (MHWs) are discrete warm-water anomalies events occurring in every ocean around the globe, in both coastal and open ocean, having major impacts on ecosystems, fisheries and aquaculture. Although processes leading to MHWs formation are becoming more and more studied since the beginning of the 2010s, the way they interact together to trigger MHWs remains not fully understood. Nevertheless, their link to human-induced global warming tends to be certain. The southern part of Chile (41°5’S - 56°S) is characterized by fjord ecosystems already experiencing global warming consequences, whether large-scale or local climate modifications. However, to the best of our knowledge, MHWs occurrence in Southern Chile has never been subject to studies, despite the fjord ecosystem’s vulnerability to climate warming. Therefore, we assessed a global analysis of the MHWs that have occurred between 1982 and 2020 along Central and South coastal Chile, from 29°S to 55°S. We found that the last decade was record-breaking in terms of duration, intensity and occurrence of MHWs. In 2016, succession of MHWs during austral autumn, winter and spring lead to the formation of the longest (148 days, almost 5 months) and most extreme events (2.25°C above the climatology) ever recorded along Chile between 1982 and 2020. Those events were due to the advection of warm-waters anomalies coming from the open ocean and combination of persisting high pressure system with lower winds having led to reduced heat transfer from the ocean to the atmosphere. In addition, a global context of positive phases of El Niño Southern Oscillation and Southern Annular Mode contributed to the MHWs formation. Les vagues de chaleur marine, ou marine heatwaves (MHWs), sont des évènements discrets caractérisés par des eaux anormalement chaudes. Elles se produisent dans tous les océans, que ce soit en milieu côtier ou en pleine mer, et impactent fortement les écosystèmes marins, mais également les pêcheries et l’aquaculture. Bien que les processus menant à la formation de tels évènements soient de plus en plus étudiés depuis le début des années 2010, les interactions qu’ils ont entre eux pour conduire à la formation de MHWs restent encore relativement méconnues. Il est cependant de plus en plus certain que les MHWs sont liées au réchauffement climatique anthropique. Le sud du Chili (41°5’S – 46°S) est constitué d’un ensemble de fjords où les conséquences du réchauffement climatique se font déjà ressentir, que ce soient des modifications climatiques à l’échelle locale ou régionale. Cependant, d’après nos connaissances, il n’y a jamais eu d’étude portant sur les MHWs dans cette région du monde. Par conséquent, nous avons réalisé une étude globale des MHWs qui se sont produites entre 1982 et 2020 le long des côtes du Centre et du Sud du Chili, de 29°S à 55°S. Nous avons trouvé que la dernière décennie a été marquée par des MHWs particulièrement longues et fortes, et qu’elles se sont produites en plus grand nombre. En 2016, plusieurs MHWs se sont succédées de l’automne jusqu’au printemps australs, conduisant à la formation de la plus longue MHW (148 jours) et de la plus extrême (2.25°C au-dessus de la climatologie). Ces MHWs se sont produits suite au transport près des côtes d’eaux anormalement chaudes en provenance du Pacifique extratropical, associées à des hautes pressions stationnaires et une réduction des vents conduisant à une diminution des échanges de chaleur entre l’océan et l’atmosphère, en partie liés à des phases positives de El Niño Southern Oscillation et du Southern Annular Mode.


Book
Impacts of Climate Change on Human Health
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Climate change poses a serious challenge to our health and wellbeing. The increasing frequency of extreme weather events such as floods, droughts, and heatwaves, and the direct impacts of changes in temperature have direct impacts on health. At the same time, broader environmental change affects infectious disease risk, air pollution, and other forms of exposure. The different ways in which climate change will affect health are complex, interactive, and different communities are disproportionately affected. International actions such as the Paris Agreement and the Sustainable Development Goals recognise the future risks to society and acknowledge that we are already committed to a certain level of climate change. Future adaptation measures therefore need careful assessment and implementation for us to be able to minimise the potential risks from climate change and, at the same time, maximise the potential health benefits of a cleaner, greener world. This Special Issue comprises original research articles and detailed reviews on the likely impacts of climate change on health in a range of geographical settings, and the potential for adaptation measures to reduce some of these risks. Ultimately, studies like these will motivate policy level action for mitigation and help in determining the most effective methods of adaptation to reduce negative impacts in future through embedding scientific evidence into practice.


Book
Impacts of Climate Change on Human Health
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Climate change poses a serious challenge to our health and wellbeing. The increasing frequency of extreme weather events such as floods, droughts, and heatwaves, and the direct impacts of changes in temperature have direct impacts on health. At the same time, broader environmental change affects infectious disease risk, air pollution, and other forms of exposure. The different ways in which climate change will affect health are complex, interactive, and different communities are disproportionately affected. International actions such as the Paris Agreement and the Sustainable Development Goals recognise the future risks to society and acknowledge that we are already committed to a certain level of climate change. Future adaptation measures therefore need careful assessment and implementation for us to be able to minimise the potential risks from climate change and, at the same time, maximise the potential health benefits of a cleaner, greener world. This Special Issue comprises original research articles and detailed reviews on the likely impacts of climate change on health in a range of geographical settings, and the potential for adaptation measures to reduce some of these risks. Ultimately, studies like these will motivate policy level action for mitigation and help in determining the most effective methods of adaptation to reduce negative impacts in future through embedding scientific evidence into practice.


Book
When the Sahara was green : how our greatest desert came to be
Author:
ISBN: 0691228892 Year: 2021 Publisher: Princeton, New Jersey : Princeton University Press,

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"The little-known history of how the Sahara was transformed from a green and fertile land into the largest hot desert in the world. The Sahara is the largest hot desert in the world, equal in size to China or the United States. Yet, this arid expanse was once a verdant, pleasant land, fed by rivers and lakes. The Sahara sustained abundant plant and animal life, such as Nile perch, turtles, crocodiles, and hippos, and attracted prehistoric hunters and herders. What transformed this land of lakes into a sea of sands? When the Sahara Was Green describes the remarkable history of Earth's greatest desert-including why its climate changed, the impact this had on human populations, and how scientists uncovered the evidence for these extraordinary events. From the Sahara's origins as savanna woodland and grassland to its current arid incarnation, Martin Williams takes us on a vivid journey through time. He describes how the desert's ancient rocks were first fashioned, how dinosaurs roamed freely across the land, and how it was later covered in tall trees. Along the way, Williams addresses many questions: Why was the Sahara previously much wetter, and will it be so again? Did humans contribute to its desertification? What was the impact of extreme climatic episodes-such as prolonged droughts-upon the Sahara's geology, ecology, and inhabitants? Williams also shows how plants, animals, and humans have adapted to the Sahara and what lessons we might learn for living in harmony with the harshest, driest conditions in an ever-changing global environment. A valuable look at how an iconic region has changed over millions of years, When the Sahara Was Green reveals the desert's surprising past to reflect on its present, as well as its possible future"--

Keywords

Climatic changes --- Desertification --- Aeolian processes. --- Algae. --- Algeria. --- Alluvium. --- Americas. --- Andes. --- Anthozoa. --- Arid. --- Atlantic Ocean. --- Black coral. --- Bolivia. --- Carbon dioxide. --- Chad Basin. --- Chile. --- Climate change. --- Cnidaria. --- Cnidocyte. --- Coal. --- Coral reef. --- Date palm. --- Dendrochronology. --- Deriba Caldera. --- Desert climate. --- Desert. --- Desertification. --- Drought. --- Dry lake. --- Dry valley. --- Dune. --- Earth materials. --- Earth science. --- Earth's orbit. --- East Africa. --- Ecosystem. --- Ecuadorians. --- El Niño-Southern Oscillation. --- Emblem book. --- Erosion. --- Exploration. --- Far North (South Australia). --- Feather. --- Fertilizer. --- Fire coral. --- Goatskin (material). --- Google Earth. --- Grassland. --- Grazing. --- Great Sand Sea. --- Green development. --- Groundwater. --- Herbicide. --- Herder. --- Hippos. --- Iferouane. --- Inca Empire. --- Indo-Pacific. --- Kufra. --- Lake Chad. --- Land snail. --- Libyan Desert. --- Mauritania. --- Mediterranean Sea. --- Mesa. --- Microclimate. --- Monsoon. --- Neolithic. --- Nile. --- North Africa. --- North America. --- Overgrazing. --- Pastoralism. --- Perennial water. --- Pesticide. --- Photosynthesis. --- Plankton. --- Planula. --- Plate tectonics. --- Pollution. --- Polyp. --- Sahara. --- Sand. --- Savanna. --- Sediment. --- Semi-arid climate. --- Silt. --- Soil. --- Solar energy. --- Stolon. --- Stone tool. --- Surface layer. --- Temperate climate. --- Tentacle. --- The Natural Step. --- Tropics. --- Tunisia. --- Vegetation. --- Weathering. --- West Africa. --- Westerlies. --- Year. --- Sahara --- Climate --- History.

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