Redoubt now Ultraplinian

The rumbling Alaskan volcano Redoubt has exploded producing a stratosphere-reaching plume in excess of 60,000 ft (17 km). An eruption is termed ‘ultraplinian’ if its ejecta reaches the stratosphere, about 10km in height. Dust and gases in the stratosphere are known to depress the global temperature for up to a few years after the eruption. The extent of cooling depends on the amount and type of material, the size and duration of ultraplinian eruption, and the latitude (high latitude eruptions like Redoubt are less effective than lower ones).

The plume could be seen easily on infrared here (top center of first radar).

0 thoughts on “Redoubt now Ultraplinian

  1. Impressive, but not really comparable to eruptions with notable climate impacts. Pinatubo, for example, blew 34km (111,000 feet).

    You may already know this, but it’s worth mentioning anyway that there’s a rule of thumb used to relate the rate of discharge of a volcano (in cubic meters per second) to the height of the plume [in kilometers]. [Height] = 1.67*[Rate of Discharge]^0.259. I don’t know where that comes from, but it appears to be an empirically-derived formula.

    Given the difference in heights, you get about 1/8th the rate of discharge for Redoubt, and with the shorter eruption (0.5 hours versus 1.25 hours – roughly in both cases), you end up with about 1/20 the total discharge.

    Of course, if you’re hoping for a noticeable impact, this eruption may not be the biggest.

  2. Impressive, but not really comparable to eruptions with notable climate impacts. Pinatubo, for example, blew 34km (111,000 feet).

    You may already know this, but it’s worth mentioning anyway that there’s a rule of thumb used to relate the rate of discharge of a volcano (in cubic meters per second) to the height of the plume [in kilometers]. [Height] = 1.67*[Rate of Discharge]^0.259. I don’t know where that comes from, but it appears to be an empirically-derived formula.

    Given the difference in heights, you get about 1/8th the rate of discharge for Redoubt, and with the shorter eruption (0.5 hours versus 1.25 hours – roughly in both cases), you end up with about 1/20 the total discharge.

    Of course, if you’re hoping for a noticeable impact, this eruption may not be the biggest.

  3. Morgan. That is a fantastic picture. Thanks also for the rule of thumb. I saw the plume quite clearly on the infrared this morning, a large sausage shape, but it dissipated very quickly.

  4. Morgan. That is a fantastic picture. Thanks also for the rule of thumb. I saw the plume quite clearly on the infrared this morning, a large sausage shape, but it dissipated very quickly.

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