{"id":20025632,"date":"2018-09-17T12:31:20","date_gmt":"2018-09-17T07:01:20","guid":{"rendered":"https:\/\/www.thethirdpole.net\/?p=25632"},"modified":"2021-01-05T18:00:49","modified_gmt":"2021-01-05T12:30:49","slug":"floods-and-droughts-weather-extremes-beyond-1-5-celsius","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/climate\/floods-and-droughts-weather-extremes-beyond-1-5-celsius\/","title":{"rendered":"Floods and droughts – weather extremes beyond 1.5 Celsius"},"content":{"rendered":"

As the Northern Hemisphere summer advances, reports of new heat records around  the world<\/a>, and especially of the now so-called \u201cSummer 2018 European heatwave\u201d bringing devastating wildfires, death and water shortages, carry a sense of d\u00e9j\u00e0 vu reminding us that climate change already affects the living conditions of billions. Early indications are that climate change increased the risk of this year\u2019s heatwave five times<\/a>.<\/p>\n

We already felt this at the end of 2017, a devastating year in terms of extreme weather events after which it became clear that these can already constitute an existential menace for vulnerable populations<\/a><\/u>, threatening their capacity to cope and adapt.<\/p>\n

Unfortunately this may well have just been \u201ca sign of things to come<\/a>\u201d, as the leading reinsurance firm MunichRe declared, after looking back at the very high losses it recorded from natural disasters last year.<\/p>\n

The MunichRe statement is consistent with an ever-growing body of evidence showing that climate change has substantially contributed to an already long list of extreme events<\/a>. It is a clear call to society to get prepared for the consequences of tomorrow\u2019s climatic changes. Indirectly, it is also a call to science to deliver information on what is the starting point when it comes to adaptation to extreme weather events and impacts: what to expect next?<\/p>\n

In recent years, climate scientists have been working on refining the answers to this question. A big part of this effort started after the UNFCCC<\/span> adopted the Paris Agreement that calls for limiting the global mean temperature increase to well-below 2\u00b0C <\/em>and pursuing efforts <\/em>to limit the increase to 1.5\u00b0C <\/em>above pre-industrial levels.<\/p>\n

At this point, given the prominence of 1.5\u02daC in the Paris Agreement, and to lift some of the uncertainty around the impacts of climate change for the Paris Agreement\u2019s long term temperature goal, the UNFCCC<\/span> invited the IPCC<\/span> to prepare a special report on 1.5\u02daC.<\/p>\n

Given the natural variability that characterises the climate system, distinguishing the consequences of climate change for two relatively close levels of warming is not an easy task, especially when one is interested in regional and sector-specific details. However, concerted effort by climate scientists in response to the IPCC<\/span> report brought an impressive body of new results.<\/p>\n

What past observations tell us about the near future<\/strong><\/p>\n

A Climate Analytics-led study based<\/a><\/u> on the observational records from the 20th<\/sup>century shows that in the very recent past (since 1960), half a degree of warming has already resulted in significant increases in the intensity of hot extremes as well as heavy rainfall, providing a good indication to what an additional half a degree warming could result in the future.<\/p>\n

Another study<\/a> demonstrated that anthropogenic global warming has already increased the probability of record-setting heat extremes, heavy precipitation events and droughts over 50 to 90% of North America, Europe and East Asia. As we are now ~0.5\u00b0C away from the 1.5\u00b0C<\/a> temperature limit, these results already provide sobering insights into what the world could look like even if we reach it.<\/p>\n

What climate models project<\/strong><\/p>\n

But observations have their limitations in predicting the future, as some processes driving climate extreme events may not evolve in an orderly, linear fashion. As an alternative, scientists have used climate models, which have confirmed that the trends observed globally over recent decades will persist<\/a> for each increment of global mean temperature.<\/p>\n

The clearest examples are for severe heat waves<\/a>, to which almost 37% of the global population will be exposed at least once every five years in a 2\u00baC warmer world \u2013  three times larger than for a 1.5\u00baC world (almost 14%).<\/p>\n

Heatwaves can also occur in the ocean, where they manifest as prolonged periods of anomalously high sea surface temperatures, causing major threats to marine organisms and coral reefs. A newly released study shows that the number of marine heatwave days will be multiplied by 16 at 1.5\u00b0C<\/a>compared to now, and by 23 at 2.0\u00b0C.<\/p>\n

Although there are more geographical variations in the projections for heavy rain than for heatwaves, limiting global mean temperature increase to 1.5\u2009\u00b0C compared to a 2\u2009\u00b0C scenario could reduce the global risk for this kind of extreme events by one third.<\/a><\/p>\n

And just as excess precipitation will become an increasingly frequent hazard, so will the lack of it. The projected drought signals indicate that limiting global warming to 1.5\u00b0C rather than 2\u00b0C would halve the share of the world population that will be exposed to exacerbated or new water scarcity<\/a><\/p>\n

The developing world will be hardest hit<\/strong><\/p>\n

Science also tells us that some regions and population groups will be hit harder than others. While there will be no real winners in a warming climate, it is clear that the biggest losers will be the poorest and most vulnerable.<\/p>\n

Exceeding the 1.5\u00b0C global warming limit would lead to the low-income nations experiencing the greatest local climate changes<\/a>. Among developing countries, the bottom 40% of income earners are projected to suffer 70% higher income losses<\/a> than the average population.<\/p>\n

The tropical regions, where much of the developing countries are located, will be at the forefront of these changes. An additional half a degree increase in global mean temperature would mean that the tropics will undergo strongest increase  in warming relative to natural variability<\/a>, as shown in a study led by Climate Analytics scientists.<\/p>\n

Even at 2\u00baC warming, the summers there could turn into one continuous heatwave<\/a>. Two analyses led by Climate Analytics experts show that combining this extreme heat with the robust reduction of the rainy season<\/a><\/u> as well as lower crop yield<\/a><\/u> at 2\u00baC makes for an overall gloomy picture for these tropical regions which already host a high incidence of severe poverty.<\/p>\n

Overall, Africa and Southeast Asia are expected to suffer the most severe impacts of climate change. Studies focusing on Africa have, for example, found robustly lower increases in both the intensity and frequency of heat extremes<\/a>, and significantly less intense drought conditions in the northern, western and southern <\/a>parts of the continent for a 1.5\u00b0C compared to a 2\u00b0C world.<\/p>\n

Southeast Asia, the other hot spot region, is likely to face a higher rise in heavy intensity rainfall events in a 2\u00baC warmer world <\/a><\/u> relative to 1.5 \u00baC. A half a degree increase would also mean an increase in extreme maximum temperature in China\u2019s urban agglomerations<\/a>.<\/p>\n

For coastal communities, the risk from extreme events<\/a> is exacerbated by rising global sea levels<\/a>, with crucial consequences especially for the small island states. Relative to 1.5\u00baC, 2\u00baC would mean 10 cm higher sea levels and a 30% higher rate of increase by 2100<\/a><\/u>. <\/u><\/p>\n

What might look like a small difference actually means the additional inundation of lands currently home to about five million inhabitants, including 60,000 who live on small islands<\/a><\/u>. At the same time, warmer sea surface temperatures are also projected to bring more energy into tropical storms, leading to an increased frequency of the strongest<\/a><\/u> of them. The perspective of more frequent megastorms acting in combination with sea level rise and heavier precipitation events raises extremely serious concerns about their future impacts on vulnerable coastal populations and infrastructures.<\/p>\n

This would cripple even more regions, which often crucially depend for their food supply on coral reef ecosystems since the latter, already severely enfeebled by ocean acidification, may simply virtually disappear<\/a> if global warming exceeds the 1.5\u00b0C limit.<\/p>\n

\"\"
\nA devastated street of Roseau, Dominica after Hurricane Irma (2017). The odds of such a megastorm are increased by warming sea surface temperatures and will be multiplied at 1.5\u00b0C, and even more at 2\u00b0C of global warming.<\/em> Read the Climate Analytics briefing on tropical cyclones for more information.<\/em><\/a>.<\/p>\n

Climate impacts on the developed world<\/strong><\/p>\n

Although low-income countries will bear the brunt of future climate change, this doesn\u2019t mean developed countries will be able to dodge the juggernaut that already represents reaching 2\u00b0C above pre-industrial.<\/p>\n

In Europe<\/a>, the events similar to the European record hot summer of 2003, which caused tens of thousands of deaths, would be at least 24% less frequent in a world at 1.5\u2009\u00b0C global warming compared to 2\u2009\u00b0C global warming.<\/p>\n

Shifting from 1.5\u00b0C to 2.0\u00b0C would lead to an enormous increase in dryness<\/a> and reduced water availability in the Mediterranean region.<\/p>\n

And limiting warming to 1.5 \u00baC, relative to 2\u00baC, would perceptibly reduce the frequency of extreme heat events in Australia<\/a>.<\/p>\n

These new findings clearly show that limiting global warming increase to 1.5\u00b0C above preindustrial levels would greatly alleviate future impacts on societies across the world. The great scientific efforts that were undertaken to reach these conclusions will be synthesised in the IPCC<\/span> special report due out this autumn, and should serve as a call to urgent action to reduce greenhouse gas emissions now.<\/p>\n

Extreme events under 1.5 vs 2 degree warming: key facts and figures<\/strong><\/p>\n

\"\"<\/p>\n

References: (1) Dosio et al. 2018<\/a>; (2) Zhang et al. 2017<\/a>; (3) Gerten et al. 2013<\/a>; (4) Roberts 2018<\/a>; (5) Schleussner et al. 2016<\/a>; (6) Lehner et al. 2017<\/a>; (7) Schleussner et al. 2016<\/a>; (8) Yu et al. 2017<\/a>; (9) King et al. 2017a<\/a>; (10) King et al. 2017b<\/a>; (11) Lehner et al. 2017<\/a><\/p>\n

 <\/p>\n

This article was first published as a blogpost on Climate Analytics<\/a>, and has bee reproduced with permission. This is an overview of the most important of the recent 1.5\u02daC studies on climate impacts and extreme events. Much of it will be synthesised in the IPCC<\/span> special report, due out in October, which will be a key document for setting the course of climate policy at a global level.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

The latest research shows that exceeding the 1.5 Celsius limit that was the aim of the Paris Accord by even half a degree would have a massive, disastrous effect on vulnerable populations, especially in the developing world<\/p>\n","protected":false},"author":2194,"featured_media":20025633,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[761],"tags":[17827,519,543],"hashtags":[],"country":[],"class_list":["post-20025632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate","tag-climate-adaptation","tag-climate-impacts","tag-extreme-weather"],"acf":[],"yoast_head":"\nFloods and droughts - weather extremes beyond 1.5 Celsius | Dialogue Earth<\/title>\n<meta name=\"description\" content=\"The latest research shows that exceeding the 1.5 Celsius limit that was the aim of the Paris Accord by even half a degree would have a massive, 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