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| Open AccessRethinking Indian monsoon rainfall prediction in the context of recent global warming
Indian summer monsoon rainfall impacts millions of people and accurate forecasts are highly desirable, yet official operational forecasts have failed to predict extreme events in 1994, 2002, 2004 and 2009. Here, the authors use dynamical and physical–empirical models to investigate the reasons for this failure.
- Bin Wang
- , Baoqiang Xiang
- & Kyung-Ja Ha
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| Open AccessLong-term decline in grassland productivity driven by increasing dryness
How primary production is influenced by climatic forcing has not been tested in most ecosystems. Here, the authors study a four-decade record of grassland production and find a sustained decline in above-ground net primary production attributable to increased aridity from declining late-summer rainfall.
- E. N. J. Brookshire
- & T. Weaver
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| Open AccessClimate variability modulates western US ozone air quality in spring via deep stratospheric intrusions
Deep stratospheric ozone intrusions can elevate western US ground-level ozone to unhealthy concentrations, but the factors driving interannual variability are poorly understood. Here, the authors combine observations and numerical simulations showing a link between intrusion events and strong La Niña winters.
- Meiyun Lin
- , Arlene M. Fiore
- & Harald E. Rieder
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Coupled reversion and stream-hyporheic exchange processes increase environmental persistence of trenbolone metabolites
Cattle growth hormone metabolites found in agricultural runoff are primarily removed from surface waters by photodegradation. Here, Ward et al. develop a model of stream transport, finding reversion in perpetually dark hyporheic zones increases environmental persistence of these endocrine disruptors.
- Adam S. Ward
- , David M. Cwiertny
- & Colleen C. Brehm
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| Open AccessExposure age and ice-sheet model constraints on Pliocene East Antarctic ice sheet dynamics
The behaviour of Antarctic ice sheets during warm climates of the past is poorly understood. Here, the authors combine cosmogenic nuclide exposure ages and numerical simulations in an effort to assess changes in East Antarctic ice sheet thickness since the Pliocene.
- Masako Yamane
- , Yusuke Yokoyama
- & Hiroyuki Matsuzaki
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| Open AccessSkilful multi-year predictions of tropical trans-basin climate variability
Sea surface temperature anomalies in the tropical Pacific can influence global atmospheric circulation, yet prediction of this atmospheric signal is limited to less than 1 year. Here, the authors present observational and modelling evidence for multi-year predictability.
- Yoshimitsu Chikamoto
- , Axel Timmermann
- & Fei-Fei Jin
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Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions
While present in palaeoclimate records, the drivers behind 20-year climate variability are poorly understood. Here, using climate simulations and in situand palaeo data, the authors present a possible link between volcanic eruptions, Great Salinity Anomalies and the Atlantic overturning circulation.
- Didier Swingedouw
- , Pablo Ortega
- & Roland Séférian
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A Bayesian modelling framework for tornado occurrences in North America
Tornadoes are one of nature’s most hazardous phenomena, yet prognostic tools for tornado occurrence are lacking. Here, the authors use Bayesian inference techniques to evaluate the spatiotemporal relationship between atmospheric variables and tornado activity in North America.
- Vincent Y.S. Cheng
- , George B. Arhonditsis
- & Heather Auld
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Increased sensitivity to climate change in disturbed ecosystems
The role of successional state in determining ecosystem sensitivity to climate change is largely unknown. Here, the authors subject seven European shrublands to moderate warming and drought conditions over 14 years and show that responsiveness is associated with the dynamic state of the ecosystem.
- György Kröel-Dulay
- , Johannes Ransijn
- & Josep Penuelas
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| Open AccessTropical cyclone rainfall area controlled by relative sea surface temperature
The rainfall rate of tropical cyclones is expected to increase under a warmer climate, yet likely changes in rainfall area remain unknown. Here, the authors combine satellite data and model simulations and show that rainfall area is dependent on relative sea surface temperatures.
- Yanluan Lin
- , Ming Zhao
- & Minghua Zhang
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| Open AccessReconciling spatial and temporal soil moisture effects on afternoon rainfall
The sign of soil moisture–precipitation feedback has been strongly debated. Here, the authors show that rain tends to fall where soils are drier than their surroundings, but on days with overall wet and heterogeneous conditions, explaining the apparent contradictions between recent studies.
- Benoit P. Guillod
- , Boris Orlowsky
- & Sonia I. Seneviratne
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An extreme event of sea-level rise along the Northeast coast of North America in 2009–2010
Extreme sea level rises are a threat to coastal communities, but their cause, in terms of seasonal or interannual time scales, has received little attention. Here, the authors combine observational and model data to show that one such rise in 2009–10 was caused by a 30% downturn in the Atlantic overturning circulation.
- Paul B. Goddard
- , Jianjun Yin
- & Shaoqing Zhang
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Trends and oscillations in the Indian summer monsoon rainfall over the last two millennia
Summertime rainfall over South Asia has declined in the last few decades, possibly due to human aerosols. Here, the authors present a record of Indian monsoon rainfall over the last two millennial and suggest that large natural variability may mask any forced changes in monsoon.
- Ashish Sinha
- , Gayatri Kathayat
- & R. L. Edwards
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Probing failure susceptibilities of earthquake faults using small-quake tidal correlations
Using tidal correlations as a predictive tool for earthquakes is controversial because of the size of the data set. This study examines correlations between small earthquakes and periodic fault stresses to build a simple predictive model for larger quakes that shows good agreement with observed trends.
- Braden A.W. Brinkman
- , Michael LeBlanc
- & Karin A. Dahmen
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| Open AccessTropical Atlantic temperature seasonality at the end of the last interglacial
The last interglacial has been suggested as a test bed for models developed for future climate prediction, yet many climatic parameters remain unknown. Here, the authors present a precisely dated fossil coral and show that temperature seasonality in the southern Caribbean Sea 118 ka was similar to today.
- Thomas Felis
- , Cyril Giry
- & Sander R. Scheffers
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| Open AccessEarly warning signals of Atlantic Meridional Overturning Circulation collapse in a fully coupled climate model
The ability to predict a potential collapse of the Atlantic Meridional Overturning Circulation is widely desired, but problematic. Here, using a fully coupled atmosphere-ocean general circulation mode, the authors show that early warning signs can be detected 250 years in advance.
- Chris A. Boulton
- , Lesley C. Allison
- & Timothy M. Lenton
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Orbital Asian summer monsoon dynamics revealed using an isotope-enabled global climate model
Asian speleothem δ18O records are widely used as a proxy for summer monsoon intensity, but their validity has been questioned. Here, the authors evaluate their validity using a 150,000-year transient simulation from an isotope-enabled global climate model.
- Thibaut Caley
- , Didier M. Roche
- & Hans Renssen
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Prediction of extreme floods in the eastern Central Andes based on a complex networks approach
Extreme rainfall events in the eastern Central Andes can result in substantial economic and ecological damage, yet their prediction is difficult. Here, the authors introduce the concept of network divergence and propose a general framework for the prediction of extreme events.
- N. Boers
- , B. Bookhagen
- & J. A. Marengo
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Validation of climate model-inferred regional temperature change for late-glacial Europe
Comparison of climate model hindcasts with proxy data is essential to improve model reliability, yet standardized palaeoclimate data sets are lacking. Here, Heiri et al. compare chironomid-based palaeotemperature records with the ECHAM-4 atmospheric general circulation model, showing excellent agreement.
- Oliver Heiri
- , Stephen J. Brooks
- & André F. Lotter
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Impacts of El Niño Southern Oscillation on the global yields of major crops
El Niño Southern Oscillation affects seasonal climate worldwide; however, it is uncertain how it impacts global crop yields. Here, the authors present a global assessment of the impacts of El Niño Southern Oscillation on crop productivity and show large differences among regions, crop types and cropping technologies.
- Toshichika Iizumi
- , Jing-Jia Luo
- & Toshio Yamagata
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| Open AccessThe effectiveness of coral reefs for coastal hazard risk reduction and adaptation
The risks of flooding to coastal communities are increasing due to coastal development and climate change. Here, the authors use meta-analyses to quantitatively show that coral reefs can significantly reduce risks from natural hazards, and that reef defences can be enhanced cost effectively.
- Filippo Ferrario
- , Michael W. Beck
- & Laura Airoldi
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| Open AccessMadden–Julian Oscillation prediction skill of a new-generation global model demonstrated using a supercomputer
Prediction of the Madden–Julian Oscillation using complex cloud-resolving models has been limited by computational power. Here, Miyakawa et al.run a series of simulations using the newly developed 10 peta-flop ‘K computer’ and demonstrate a Madden–Julian Oscillation predictive window of 27 days.
- Tomoki Miyakawa
- , Masaki Satoh
- & Kunio Yoneyama
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| Open AccessPotential climate engineering effectiveness and side effects during a high carbon dioxide-emission scenario
The effectiveness of climate engineering in averting potentially catastrophic climate change has thus far been poorly evaluated. Keller et al. use an Earth system model to show that five different climate engineering scenarios are likely to have either a limited impact or potentially severe side effects.
- David P. Keller
- , Ellias Y. Feng
- & Andreas Oschlies
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Regional climate model simulations indicate limited climatic impacts by operational and planned European wind farms
Wind power installations have boomed across Europe in recent decades, yet the potentially negative impact of wind farms on climate remains largely untested. Vautard et al. parameterize operational and planned European wind farms in a regional climate model and show limited regional-scale climate impacts.
- Robert Vautard
- , Françoise Thais
- & Paolo Michele Ruti
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The European functional tree of bird life in the face of global change
Species response to environmental change can have an impact on community assemblages and ecosystem functioning. Here, the authors assess the combined impact of regional land use and climate change on bird functional diversity and find that global changes may lead to uniform species assemblages across Europe.
- Wilfried Thuiller
- , Samuel Pironon
- & Niklaus E. Zimmermann
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Asian pollution climatically modulates mid-latitude cyclones following hierarchical modelling and observational analysis
Intense aerosol outflows from East Asia have been observed, yet their impact on climate has not been quantified. Wang et al.combine regional mesoscale and global climate models with observations to show that Asian pollution causes large decadal variations in mid-latitude cyclone intensity.
- Yuan Wang
- , Renyi Zhang
- & R. Saravanan
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Spatial optimization of carbon-stocking projects across Africa integrating stocking potential with co-benefits and feasibility
Africa is one of the fastest growing regions for the voluntary carbon market. Here, Greve et al.quantify the potential for aboveground C stocking across tropical Africa and assess the optimal placement of carbon-stocking projects when also taking co-benefits and feasibility into account.
- Michelle Greve
- , Belinda Reyers
- & Jens-Christian Svenning
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Pink marine sediments reveal rapid ice melt and Arctic meltwater discharge during Dansgaard–Oeschger warmings
Meltwater pulses from Northern Hemisphere ice sheets are strongly implicated in past millennial-scale shifts in ocean circulation, yet direct evidence is sparse. Here, a 30,000-year glacial meltwater history for the Svalbard–Barents Sea ice sheet is reconstructed in a marine sediment core.
- Tine L. Rasmussen
- & Erik Thomsen
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| Open AccessHuman deforestation outweighs future climate change impacts of sedimentation on coral reefs
Forest cover up-river influences the sediments reaching coral reefs, but how this relationship is affected by future climate change is not clear. In a study of the Malagasy coral reefs, Maina et al.find that regional land-use management is more important than mediating climate change for reducing reef sedimentation.
- Joseph Maina
- , Hans de Moel
- & Jan E. Vermaat
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| Open AccessDevelopment of Middle Stone Age innovation linked to rapid climate change
The South African archaeological record contains evidence of the early flourishing of the human mind. Ziegler et al. provide new paleoclimate reconstructions, which suggest that rapid fluctuations in global climate have played a key role in the evolution of these early human cultures.
- Martin Ziegler
- , Margit H. Simon
- & Rainer Zahn
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| Open AccessObservations from old forests underestimate climate change effects on tree mortality
It is thought that only climate change drives temporal tree mortality increases in old forests. Here, Luo and Chen show that both forest dynamics and climate change drive temporal tree mortality increases in young and old forests, and that climate change-associated mortality increases are higher in the young forests.
- Yong Luo
- & Han Y. H. Chen
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Climate change patterns in Amazonia and biodiversity
The long-term hydroclimate variability in Amazonia and its influence on biodiversity remain poorly understood. Here, new speleothem oxygen isotope records characterize spatial–temporal changes in precipitation and provide new insights to understanding the west–east contrasting pattern of biodiversity in Amazonia.
- Hai Cheng
- , Ashish Sinha
- & Augusto S. Auler
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Holocene winter climate variability in mid-latitude western North America
Mineral cave deposits—speleothems—provide a record of past rainfall changes. This study presents a speleothem data-set from southwestern Oregon, revealing winter climate change over the past 13,000 years with abrupt transitions between warm-dry and cold-wet regimes influenced by solar forcing.
- Vasile Ersek
- , Peter U. Clark
- & R. Lawrence Edwards
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Power laws reveal phase transitions in landscape controls of fire regimes
Understanding the environmental controls of past wildfires is difficult due to the lack of records of weather or vegetation. This study shows, using cross-scale analysis, how power laws associated with fire-event time series can identify critical thresholds in landscape dynamics in a rapidly changing climate.
- Donald McKenzie
- & Maureen C. Kennedy
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Three decades of high-resolution coastal sea surface temperatures reveal more than warming
A detailed assessment of near-shore temperature changes is needed for improved forecasts of the consequences of coastal warming. Here, changes in coastal sea surface temperature are estimated, showing that although 71% of the world's coastlines are warming, the rates of change have varied spatially.
- Fernando P. Lima
- & David S. Wethey
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Silver hake tracks changes in Northwest Atlantic circulation
Many organisms are responding to a warming climate by shifts in spatial distribution. The poleward movement of silver hake,Merluccius bilinearis, over the last forty years is related to the position of the Gulf Stream and Atlantic meridional overturning circulation through changes in local bottom water temperature.
- Janet A. Nye
- , Terrence M. Joyce
- & Jason S. Link
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Long-term projections and acclimatization scenarios of temperature-related mortality in Europe
The sensitivity of human populations to rising global temperatures is not yet fully understood. The authors describe the link between temperature and daily mortality in over 200 European regions and calculate projections of mortality from climate models under greenhouse gas scenario simulations.
- Joan Ballester
- , Jean-Marie Robine
- & Xavier Rodó
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Observational constraints indicate risk of drying in the Amazon basin
Assessments of future water availability in South America are uncertain based on multiple coupled general circulation models. Shiogamaet al.identify global-scale metrics for measuring the reliability of water resource assessments, and indicate a higher probability of drying in the Amazon basin.
- Hideo Shiogama
- , Seita Emori
- & Toru Nozawa
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Growth rates of Florida corals from 1937 to 1996 and their response to climate change
Ocean acidification due to increasing carbon dioxide levels can affect the growth and viability of corals. In this study, the authors measured extension, calcification and density in Florida corals collected in 1996, and show that recent climate change did not cause a decline in their extension or calcification.
- Kevin P. Helmle
- , Richard E. Dodge
- & C. Mark Eakin
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Regional insight into savanna hydrogeomorphology from termite mounds
Global vegetation models are too coarse to predict climate change effects at the hillslope level. Using high-resolution LiDAR, the authors explore the three-dimensional structure and vegetation of an African savanna, and suggest that finer hydrogeomorphological features will shape future climate effects.
- Shaun R. Levick
- , Gregory P. Asner
- & David E. Knapp
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| Open AccessSustainable biochar to mitigate global climate change
The storage in soils of biochar, the product of biomass pyrolysis, has been proposed as an attractive option to mitigate climate change. Amonette and co-workers model the potential impact of biochar and find that it could eliminate more carbon from the atmosphere than using the same biomass for biofuel.
- Dominic Woolf
- , James E. Amonette
- & Stephen Joseph