5 Aug 2026
Meta & Fysikken: Afsnit 124: El Nino, Heat Domes & iskapper
Vi dykker lidt ned i jordens varmestrømme. Hvad er det der sker lige denne sommer?
Her er Karina’s noter til dagens afsnit.
1) Heat Dome, eller hvad DMI kalder det - Omega-Blokering
2) Hvad er El Niño
3) Hvad er El Niña
4) Hvordan er 2026 El Niño anderledes?
5) Is-kappe re-generering
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1) Heat Dome, eller hvad DMI kalder det - Omega-Blokering
Omegablokering lagde låg på vejret og løftede Danmark til 37 grader
En fastlåst bølge i atmosfæren sendte varm luft fra Nordafrika mod Danmark og var med til at udløse sidste uges hedebølge. Klimaforandringer skaber ikke omegablokeringen, men gør den varme, som følger med, mere intens. En ny blokering er ved at sætte sig fast.
https://www.dmi.dk/nyheder/2026/omegablokering-lagde-laag-paa-vejret-og-loeftede-danmark-til-37-grader
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2) Hvad er El Niño:
El Niño is a naturally occurring climate pattern characterized by the unusual warming of surface waters in the central and eastern tropical Pacific Ocean. It represents the "warm phase" of a larger, global ocean-atmosphere cycle called the El Niño-Southern Oscillation (ENSO).
Under normal conditions, equatorial trade winds blow steadily from east to west (from South America toward Asia), pushing warm surface water into the western Pacific. During an El Niño event, these trade winds weaken or completely reverse. This allows the massive pool of warm water to slosh backward across the ocean toward the Americas.
By shifting where vast amounts of ocean heat are released into the atmosphere, El Niño disrupts weather patterns worldwide:
The Americas: Warmer coastal waters suppress the normal upwelling of cold, nutrient-rich deep sea water, severely disrupting local marine ecosystems and fishing industries. The shifting Pacific jet stream brings heavy rainfall, storms, and increased flood risks to the southern United States and western South America.
Asia and Australia: Because the warm pool of water moves away from the western Pacific, places like Southeast Asia, Indonesia, and Australia experience decreased rainfall, resulting in severe droughts and heightened wildfire risks.
Global Temperatures: El Niño acts as a temporary booster for global heat, often pushing global average temperatures to record-breaking levels.
Imagine a giant, shallow bathtub. Normally, the wind blows hard across the tub, pushing all the warm surface water to one side (Asia) while cold water wells up at the back (South America). During El Niño, the wind suddenly stops blowing. That massive wall of hot water sloshes straight back across the tub toward the Americas.
Right now, in July 2026, the Pacific Ocean is sloshing backwards, and it's unleashing an unbelievable amount of heat into our global weather system.
Frequency: Occurs irregularly every two to seven years.
Duration: Typically lasts 9 to 12 months, usually developing in the northern hemisphere's spring/summer, peaking around December (hence its Spanish name, "the Christ Child" or "little boy"), and fading by the following spring
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3) Hvad er El Niña
Opposite Phase: Its cool-phase counterpart is La Niña, which features unusually cold ocean temperatures in the exact same region of the Pacific.
If El Niño is the "slosh" where warm water rushes eastward, La Niña is the "super-charge" of normal conditions. During a La Niña event, the easterly trade winds blow much stronger than usual. This acts like a giant broom, aggressively sweeping warm surface water westward toward Asia and Australia. As that warm water is pushed away, deep, icy-cold, and nutrient-rich water is pulled up to the ocean surface off the coast of South America—a process known as intense upwelling.
How La Niña Flips Global Weather
Because the vast pool of ocean heat is pinned far over in the western Pacific, the global jet stream shifts dramatically:
The United States and Canada: The polar jet stream moves farther north. This pushes freezing, moisture-heavy arctic air directly into western Canada and the
