IPCC 第六次评估报告要点汇总

Jul 16, 2026

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汇总气候科学关键结论：2015-20较有记录以来更可能更暖；1850-1900至2011-20全球平均地表温度升高1.09°C；到2100年升温范围1.4-4.4°C，1.5°C阈值预计在2030年代初跨越。降水与蒸发随增温总体增强，陆地降水自1950年以来增加且1980年代后加快，高纬增雨、地中海等地区夏季变干；部分季风增强、热带湿干季对比加剧，并讨论AMOC崩溃可能导致水循环突变。还概述海冰、冰盖、冰川、冻土与季节性积雪的融化趋势及其对海平面、未来中短期变化的影响。

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages6

Reading Time15 min

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SOMP summary of IPCC’s sixth assessment report on climate science Global warming – Effect of climate change on Earth’s temperature • Rising trend: Every year during 2015-20 has likely been warmer than any prior year for which records exist. • Global mean surface temperature (GMST) has increased by 1.09 C between the preindustrial baseline period 1850-1900 and the most recent decade of 2011-20. • Future temperature predictions o Earth will be 1.4-4.4 C hotter than pre-industrial levels by 2100, depending on whether emissions are rapidly cut to net-zero or continue to rise. o In all scenarios assessed, the central estimate of crossing the 1.5C threshold lies in the early 2030s. o Global surface temperature will continue to increase until at least the midcentury under all emissions scenarios considered. Changing rainfall patterns – Effect of climate change on global rainfall patterns • Global average precipitation and evaporation are increasing with global warming – very likely with a range of 1-3% per degree C. • Land precipitation has likely increased since 1950 and has been increasing faster since the 1980s. • In northern high latitudes, there has already been a “detectable” increase in rainfall, driven by greenhouse gas-induced radiative forcing. • The dry summer climate in areas such asthe Mediterranean, South Africa and western North America has become drier. • Some monsoons will increase in intensity, namely in south, south-east and east Asia, while others will decrease – for example, in North America. • There has been an increase in the contrast between wet and dry seasons in tropical climates. • Since the 1980s, the global-scale atmospheric circulation known as the Hadley cell has very likely widened, monsoon rains have likely increased. • The northern stratospheric polar vortex–which was behind the “Beast from the East”that struck the UK in 2018 – has weakened and experienced “more frequent excursions towards Eurasia”. • Rising temperatures will narrow and strengthen the ITCZ, resulting in more rainfall around its core and less towards the north and south. • Counter-balancing: So far, increases in monsoon intensity due to global warming have been somewhat stifled by cooling due to aerosols in the atmosphere. • “Total land area subject to increasing drought frequency and severity will expand”, with tropical areas such as Amazon and Central America becoming increasingly arid. • Tripping point to be crossed in 21st century: A collapse of the Atlantic Meridional Overturning Circulation (AMOC) can cause “abrupt shifts in the water cycle (high confidence), such as a southward shift in the tropical rain belt, weakening of the African and Asian monsoons and strengthening of southern hemisphere monsoons”. Climate change impact on world’s snow and ice • Trend: Climate change is causing ice and snow to melt across much of the planet. • Sea ice o Between decades of 1979-88 and 2010-19, average monthly A

Jul 16, 2026

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