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Why record ocean heat does not stay in the ocean

Average sea-surface temperatures outside the polar regions exceeded the corresponding date in every previous year since records began in 1982 for 100 consecutive days from June 2 through Sept. World Weather Attribution researchers described the disaster as a compound event involving rising temperatures, thinning glaciers, thawing permafrost and pre-existing geological weaknesses.[6] Climate change was highly likely to have contributed to the collapse of roughly 2 square kilometres of rock wall and glacier ice, although researchers could not assign it a precise share of responsibility.[3]

The field note

4 sources · 4 items
  1. More than 90% of the excess heat associated with fossil-fuel use and greenhouse-gas emissions enters the ocean,…
  2. Global average sea-surface temperatures reached 21.10°C on Aug. 22 in Copernicus data, while Climate Reanalyzer…
  3. El Niño raises global temperatures when weakened Pacific trade winds allow warm water to accumulate near the we…
Story 012 sources

Why record ocean heat does not stay in the ocean

Average sea-surface temperatures outside the polar regions exceeded the corresponding date in every previous year since records began in 1982 for 100 consecutive days from June 2 through Sept. 10.[1] The atmosphere held more water vapour in August than in any other recorded month, with scientists identifying global heating and the historic El Niño as contributors.[4]

Why it matters

Hotter seas can disrupt marine food chains, fisheries, tourism, coral and weather, while warmer, wetter air increases the risks of extreme rainfall, humid heat and intensified coastal heatwaves.[1][4]

Key insights

  • More than 90% of the excess heat associated with fossil-fuel use and greenhouse-gas emissions enters the ocean, according to climate scientist Zachary Labe.[1]
  • Global average sea-surface temperatures reached 21.10°C on Aug. 22 in Copernicus data, while Climate Reanalyzer measurements reached 21.18°C between Aug. 22 and 27.[1]
  • El Niño raises global temperatures when weakened Pacific trade winds allow warm water to accumulate near the west coast of South America.[1]
  • High moisture levels can impair the human body’s ability to cool itself, linking sea temperatures to health risks on land.[1]
Story 022 sources

How warming helped destabilize the Nepal-Tibet mountainside

World Weather Attribution researchers described the disaster as a compound event involving rising temperatures, thinning glaciers, thawing permafrost and pre-existing geological weaknesses.[6] Climate change was highly likely to have contributed to the collapse of roughly 2 square kilometres of rock wall and glacier ice, although researchers could not assign it a precise share of responsibility.[3]

Why it matters

The findings show how warming can act as a destabilizing factor on already vulnerable mountain terrain rather than serving as a single, isolated trigger, complicating risk assessment across glacier-covered regions.[3][6]

Key insights

  • July and August temperatures in the area were about 1.5°C warmer because of human influence on the climate, according to the attribution study.[6]
  • Regional glaciers had been thinning by roughly half a metre annually, potentially weakening fractures and increasing instability.[6]
  • Heavy snowfall in October and November contributed to substantial meltwater early in the year, adding another element to the compound event.[6]
  • Researchers said the slope may also have been weakened by the 2015 magnitude-7.8 earthquake and its rock-ice avalanche.[6]

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