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> At least a single volcanic eruption is not enough to change the long-term climate trend, you need a clusters of eruptions to persist through centuries for tha
by rad_gruchalski 4y ago
> At least a single volcanic eruption is not enough to change the long-term climate trend, you need a clusters of eruptions to persist through centuries for that.
https://en.m.wikipedia.org/wiki/1883_eruption_of_Krakatoa https://en.m.wikipedia.org/wiki/1883_eruption_of_Krakatoa
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The eruption caused a volcanic winter.[17] In the year following the eruption, average Northern Hemisphere summer temperatures fell by 0.4 °C (0.72 °F).[18] The record rainfall that hit Southern California during the water year from July 1883 to June 1884 – Los Angeles received 970 millimetres (38.18 in) and San Diego 660 millimetres (25.97 in)[19] – has been attributed to the Krakatoa eruption.[20] There was no El Niño during that period as is normal when heavy rain occurs in Southern California,[21] but many scientists doubt that there was a causal relationship.[22]
The eruption injected an unusually large amount of sulfur dioxide (SO2) gas high into the stratosphere, which was subsequently transported by high-level winds all over the planet. This led to a global increase in sulfuric acid (H2SO4) concentration in high-level cirrus clouds. The resulting increase in cloud reflectivity (or albedo) reflected more incoming light from the sun than usual, and cooled the entire planet until the sulfur fell to the ground as acid precipitation.[23]
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Yes, I’m aware of “but many scientists doubt that there was a causal relationship” regarding the rain but the climate has been affected by a single eruption.
- deleted 4y ago[deleted]
- booi 4y agoAlso https://en.wikipedia.org/wiki/Year_Without_a_Summer https://en.wikipedia.org/wiki/Year_Without_a_Summer with Mount Tambora There's good evidence this has happened multiple times in history by a single eruption.
- Comevius 4y agoThat was the consequence of at least two eruptions, one of which emitted up to 60 Tg of sulphur dioxide. HTHH only emitted 0.4 Tg. It is not impossible that HTHH affected the monsoon, but there is a thousand pound elephant in the room that will make it's effect hard to quantify.
- snewman 4y agoGP said "long-term climate trend" and then mentioned centuries. Yes, an especially large eruption can influence things for a year or two. But then the effect settles out.
- throw_nbvc1234 4y agoWell this flooding is occurring 8 months after the eruption mentioned so it seems a reasonable question to ask.
- snewman 4y agoAh, fair. A single eruption will not perturb the long-term trend, but we're discussing the short-term incident in Pakistan, and a single eruption can have notable short-term impact. (I don't know anything about whether the specific eruption in question could have any impact on this specific crisis in Pakistan.)