2 spots left on Iceland Geo Tour 16-30 July 2022

Ruapehu volcano (North Island, New Zealand): Crater Lake's fluctuating temperatures continue, currently cooling

Di, 28. Sep 2021, 01:38
01:38 AM | VON: MARTIN
Ruapehu volcano’s Crater Lake (image: GeoNet)
Ruapehu volcano’s Crater Lake (image: GeoNet)
Fluctuating temperatures at the Crater Lake since Nov 2020 (image: GeoNet)
Fluctuating temperatures at the Crater Lake since Nov 2020 (image: GeoNet)
The activity at the Ruapehu's Crater Lake (Te Wai ā-moe) is characterized by roughly regular periods of heating and cooling cycles.
In late December 2020 the lake heated to 43 °C marking the high point of that cycle. Later in April of 2021 a 2nd cycle reached a maximum of 41 °C. The latest cycle is the third this year and the heating phase lasted from early July to early September 2021, during which the temperature rose from 20 °C to 39 °C. During the heating cycle the lake color changed to a darker grey, from a blue-green colour. This is typical as sediments on the lake floor are disturbed during the influx of hot fluids and are suspended in the lake water.
The modeled heat flow into the lake has now dropped from 350-400 MW at the peak of the heating to around 200 MW (megawatt).
The Volcanic Alert Level remains at Level 1 and the Aviation Colour Code remains at Green.
Source: GeoNet New Zealand volcano activity update 27 September 2021

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Mi, 22. Sep 2021, 06:00
GeoNet reported that a heating cycle at Ruapehu's summit Crater Lake had ended. During the previous two months the temperature of the water increased from 20 degrees Celsius to a peak of 39.5 degrees on 4 September, and then decreased to 28 degrees. During the cycle the color of the lake changed from a blue-green color to a darker gray, reflecting the disturbed lake floor sediments suspended in the water from the influx of hot fluids. ... Read all
Fr, 16. Jul 2021, 06:14
Ruapehu volcano today (image: GeoNet)
Typically, over periods of months, Ruapehu's crater lake (Te Wai ā-moe) experiences heating and cooling cycles. In late December 2020 the lake heated to around 43°C marking the high point of the previous cycle. Early 2021 the lake cooled through to February 2021, before starting to heat again in early March. A maximum of 41°C was reached on 12 April 2021. The lake then started to cool down to 20°C on 2 July. The lake temperature started to rise again last week and is currently 23°C. ... Read all
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