Bleach Me Colourful ATMOSPHERIC DYNAMICS Curr

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Bleach Me Colourful ATMOSPHERIC DYNAMICS Curr research highlights OCEAN CARBON SINK the air–sea flux. Changes in sea surface season by 2100, with heavier precipitation 90s slow-down temperature caused by the volcanic eruption during the season’s peak but less before AGU Advances 1, e2019AV000149 (2020). of Mount Pinatubo modified the timing of and after. The onset and withdrawal dates the sink within the decade. These results also shifted later. In contrast, the low-end highlight the role of factors external to the warming did not significantly alter future ocean in driving variability in the ocean monsoons, highlighting the potential for carbon sink and indicate that this sink strong emissions controls to mitigate changes will decrease as soon as the growth rate of to these high-impact phenomena. BL atmospheric CO2 is reduced by reductions in anthropogenic emissions. AF https://doi.org/10.1038/s41558-020-0843-8 https://doi.org/10.1038/s41558-020-0842-9 CORAL REEFS Bleach me colourful ATMOSPHERIC DYNAMICS Curr. Biol. 30, 1–13 (2020). Regional monsoon changes Clim. Dynam. http://doi.org/dzkt (2020). Credit: IMAGEBROKER / ALAMY STOCK PHOTO Regional monsoons, including the South Asian and West African systems, More than a third of industrial-age fossil fuel are characterized by a highly uneven CO2 emissions have been absorbed by the precipitation distribution throughout the ocean. This uptake has had implications for year. The majority of the global population ocean chemistry and marine life by driving resides in areas impacted by these systems, ocean acidification, but has also mitigated and understanding the effect of climate atmospheric CO2 concentrations and warming on their intensity, onset and their impact on climate. However, despite withdrawal is important in estimating future its critical importance for climate and impacts. Global climate models exhibit understanding climate–carbon feedbacks, uncertainty at the scales needed to capture Credit: KIKE CALVO / ALAMY STOCK PHOTO the dynamics of the marine carbon sink are monsoon dynamics, leading to spread in not well constrained. future monsoon behaviour and the need for When faced with extreme stress, coral reefs Galen McKinley from Columbia more regionalized studies. can undergo bleaching: a breakdown of the University and Lamont Doherty Earth Moetasim Ashfaq of Oak Ridge National relationship between the animal host and their Observatory and colleagues investigate Laboratory, Tennessee, USA, and co-authors colourful internal photosynthetic symbionts. the mechanisms behind the slow-down of analysed regional climate model experiments Bleached corals that are unable to recover their marine carbon uptake in the 1990s through covering nine distinct monsoons, focusing symbiont populations face starvation, disease models and observations. They find that on their response to low- and high-end and death. Bizarrely, bleaching sometimes uptake slowed due to a lower growth rate warming scenarios. Under high warming, results in vibrantly green-, yellow- or purple– blue-coloured coral, rather than white. These of atmospheric CO2, which influenced all monsoons experience a contracted wet colours are known to arise from pigments produced by the coral host, but the triggers, CLIMATE COMMUNICATION mechanisms and meaning behind colourful Uncertain attribution Glob. Environ. Change 62, 102070 (2020). bleaching remain unclear. Elena Bollati from the University of Public engagement on climate change is difficult because people do not directly Southampton, UK, and colleagues show that experience long-term statistical changes in global temperatures. Instead, people colourful bleaching is a global phenomenon, experience consequences of climate change, such as extreme weather events. Although affecting multiple key reef-building species. experiences of extreme weather can impact attitudes toward climate change, it is not Their experiments reveal that upregulation clear how the science of extreme event attribution (EEA) supporting this connection of the colourful pigments by the coral host is is perceived. a natural response to increased light stress. Shannon Osaka from the University of Oxford and Rob Bellamy from the University Loss of light-shielding symbionts due to of Manchester conducted interviews and focus groups with key stakeholders about heat- or nutrient-induced bleaching can the 2011–2017 California drought. Journalists reported that it has become normal to lead to massive active upregulation of the link extreme weather and climate change, but expressed concern over the challenge of host pigments, which can then protect and simplifying the narrative for the public while also conveying uncertainty. When shown promote symbiont recolonization. media articles on differing EEA studies about the drought, neither agriculturalists Colourful bleaching can act as an nor environmentalists found the studies convincing. However, they interpreted the identifier for local environmental stressors uncertain EEA evidence in ways that confirmed their prior beliefs about whether but can also indicate post-stress coral climate change is natural or human-caused. These results suggest that while EEA has recovery potential. TAM value for the scientific community, inherent uncertainty renders it less useful as a tool https://doi.org/10.1038/s41558-020-0845-6 for public communication. JR https://doi.org/10.1038/s41558-020-0844-7 Tegan Armarego-Marriott, Alyssa Findlay, Baird Langenbrunner and Jenn Richler NATURE CLIMATE CHANGE | VOL 10 | JUly 2020 | 599 | www.nature.com/natureclimatechange 599.
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