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"climate extremes"
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Wet and dry places
\"Compares and contrasts wet and dry places around the world, such as rain forests and deserts. Includes comprehension activity\"--Provided by publisher.
Book
Global-scale changes to extreme ocean wave events due to anthropogenic warming
Extreme surface ocean waves are often primary drivers of coastal flooding and erosion over various time scales. Hence, understanding future changes in extreme wave events owing to global warming is of socio-economic and environmental significance. However, our current knowledge of potential changes in high-frequency (defined here as having return periods of less than 1 year) extreme wave events are largely unknown, despite being strongly linked to coastal hazards across time scales relevant to coastal management. Here, we present global climate-modeling evidence, based on the most comprehensive multi-method, multi-model wave ensemble, of projected changes in a core set of extreme wave indices describing high-frequency, extra-tropical storm-driven waves. We find changes in high-frequency extreme wave events of up to ∼50%–100% under RCP8.5 high-emission scenario; which is nearly double the expected changes for RCP4.5 scenario, when globally integrated. The projected changes exhibit strong inter-hemispheric asymmetry, with strong increases in extreme wave activity across the tropics and high latitudes of the Southern Hemisphere region, and a widespread decrease across most of the Northern Hemisphere. We find that the patterns of projected increase across these extreme wave events over the Southern Hemisphere region resemble their historical response to the positive anomaly of the Southern Annular Mode. Our findings highlight that many countries with low-adaptive capacity are likely to face increasing exposure to much more frequent extreme wave events in the future.
Journal Article
The hottest and the coldest
\"Learn all about the hottest and coldest places on Earth and find out what it takes for life to survive in these extreme locations\"-- Provided by publisher.
Book
2023: Weather and Climate Extremes Hitting the Globe with Emerging Features
Globally, 2023 was the warmest observed year on record since at least 1850 and, according to proxy evidence, possibly of the past 100 000 years. As in recent years, the record warmth has again been accompanied with yet more extreme weather and climate events throughout the world. Here, we provide an overview of those of 2023, with details and key background causes to help build upon our understanding of the roles of internal climate variability and anthropogenic climate change. We also highlight emerging features associated with some of these extreme events. Hot extremes are occurring earlier in the year, and increasingly simultaneously in differing parts of the world (e.g., the concurrent hot extremes in the Northern Hemisphere in July 2023). Intense cyclones are exacerbating precipitation extremes (e.g., the North China flooding in July and the Libya flooding in September). Droughts in some regions (e.g., California and the Horn of Africa) have transitioned into flood conditions. Climate extremes also show increasing interactions with ecosystems via wildfires (e.g., those in Hawaii in August and in Canada from spring to autumn 2023) and sandstorms (e.g., those in Mongolia in April 2023). Finally, we also consider the challenges to research that these emerging characteristics present for the strategy and practice of adaptation.
Journal Article
Climate variability and tropical cyclone activity
\"Tropical climate has received increased attention over the last 40 years mainly because of the El Niño - Southern Oscillation (ENSO) phenomenon and the Madden-Julian Oscillation (MJO), and their associated impacts on a local, regional, and global scale. While the MJO is the most prominent disturbance that operates on the subseasonal time scale (less than 90 days but longer than 10 days), the ENSO is a powerful interplay between the tropical ocean and atmosphere on interannual time scales with a preferred recurrence interval of 2-7 years. Studies show that MJO and ENSO can have a profound effect on global weather systems, such as shifting tropical cyclone (TC) formation location, altering frequency of occurrence, storm tracks, landfall locations, intensity, and lifespan in various ocean basins. There are at least two types of El Niño: the Eastern Pacific and Central Pacific types, which modulate regional TC activity in a different manner. In addition to ENSO, other climate modes that also influence TC activity on the interannual time scale include the North Atlantic Oscillation, Pacific Meridional Mode, and Atlantic Meridional Mode. On a longer time scale, TC activity is modulated by the decadal to interdecadal oscillations in the Atlantic and Pacific. Aside from TCs, the aforementioned climate modes also alter precipitation and temperatures variations, resulting in drought, flooding, extreme cold or warm conditions, and public health issues in many parts of the world. TC attributes are projected to change over the next 50-100 years under an anthropogenic warming scenario, although uncertainty remains\"-- Provided by publisher.
Book
Predicting seagrass recovery times and their implications following an extreme climate event
Extreme temperature events are predicted to become more frequent and intense as climate change continues, with important implications for ecosystems. Accordingly, there has been growing interest in what drives resilience to climatic disturbances. When a disturbance overwhelms the resistance of an ecosystem, it becomes vulnerable during recovery, with implications for ecosystem function and persistence. Understanding what influences ecosystem recovery is particularly important in seagrass ecosystems because of their functional roles, vulnerability, and divergent recovery strategies. Seagrass cover was monitored for 3 yr following a large, heatwave-associated mortality event in Shark Bay, Australia. Although the ecosystem’s historically dominant foundational seagrass, Amphibolis antarctica, is capable of rapid disturbance recovery, this did not occur, likely because of the failure of mechanisms which have driven rapid recovery in other systems (persistence of rhizome beds, sexual reproduction among neighboring beds). Instead, a tropical early successional seagrass, Halodule uninervis, became more common, increasing diversity. These changes in the structure of the Shark Bay seagrass ecosystem, and reduction of biomass and structural complexity, will have important implications for ecosystem services and community dynamics and indicates that this ecosystem is highly vulnerable to future disturbances. More generally, our work suggests that seagrass ecosystems typified by a mix of early and late successional species may be particularly likely to exhibit a mismatch between recovery of cover per se and recovery of function following disturbance. As such, extreme climatic events have the potential to abruptly alter seagrass community dynamics and ecosystem services.
Journal Article
Changing Degree of Convective Organization as a Mechanism for Dynamic Changes in Extreme Precipitation
Purpose of Review
What does recent work say about how changes in convective organization could lead to changes in extreme precipitation?
Recent Findings
Changing convective organization is one mechanism that could explain variation in extreme precipitation increase through dynamics. In models, the effects of convective self-aggregation on extreme precipitation are sensitive to parameterization, among other factors. In both models and observations, whether or not convective organization influences extreme precipitation is sensitive to the time and space scales analyzed, affecting extreme precipitation on some scales but not others. While trends in observations in convective organization associated with mean precipitation have been identified, it has not yet been established whether these trends are robust or relevant for events associated with extreme precipitation.
Summary
Recent work has documented a somewhat view of how changes in convective organization could affect extreme precipitation with warming, and it remains unclear whether or not they do.
Journal Article
Drought, flood, fire : how climate change contributes to catastrophes
\"Every year, droughts, floods, and fires impact hundreds of millions of people and cause massive economic losses. Climate change is making these catastrophes more dangerous. Now. Not in the future: NOW. This book describes how and why climate change is already fomenting dire consequences, and will certainly make climate disasters worse in the near future. Chris Funk combines the latest science with compelling stories, providing a timely, accessible, and beautifully-written synopsis of this critical topic. The book describes our unique and fragile Earth system, and the negative impacts humans are having on our support systems. It then examines recent disasters, including heat waves, extreme precipitation, hurricanes, fires, El Niños and La Niñas, and their human consequences. By clearly describing the dangerous impacts that are already occurring, Funk provides a clarion call for social change, yet also conveys the beauty and wonder of our planet, and hope for our collective future\"-- Provided by publisher.
Book
Compound extreme climate events intensify yield anomalies of winter wheat in France
Compound extreme climate events (ECEs) are increasingly recognized for their potential to exacerbate food insecurity risks beyond those posed by isolated events. The notion of ‘compound event’ encompasses not only co-occurring ECEs but also multiple ECEs across (different) growth stages (mECEs). The additional effects of these mECEs on crop yield, particularly considering various types of ECEs and regional scales, remain poorly understood. To close this knowledge gap, we consider droughts, pluvials, heatwaves, and coldwaves, and further identify which types of compound events have additional effects on winter wheat yield in France, using statistical methods and datasets encompassing 94 counties over a 68-year period. Our results indicate co-occurring drought heatwaves in summer and spring, along with co-occurring pluvial heatwaves and pluvial coldwaves in winter, have negative additional effects on yield compared with single ECEs. We further identify the types of mECEs that have intensified effects, with the majority showing negative effects on yield. Key interactions leading to intensified yield loss include droughts in winter or spring combined with summer co-occurring drought heatwaves, pluvials across multiple growth stages, pluvials combined with coldwaves, and the transition between droughts and pluvials, with the most severe anomaly attaining −17.2%. Coldwaves are the main ECE related to intensified yield increases, while their frequency is decreasing. Overall, this study stresses the interactions among ECEs on crop yield, and the identified types of mECEs could serve as foundational information for designing control experiments and improving process-based crop models.
Journal Article