Volcanoes continue to leak gas: volcano gas flights
About once a month we plan to make airborne measurements of sulphur dioxide (SO2), carbon dioxide (CO2) and hydrogen sulphide (H2S) outputs from the active volcanoes. The warm humid conditions this summer have challenged us, however last week we made successful flights to White Island (Whaakari), Ruapehu and Ngauruhoe. The gas output hasn’t changed much from any of the volcanoes.
The conditions were really good at Ruapehu and very good data was obtained. There is slight increase in the gas output; however this is well within the usual range seen here. The Crater Lake appeared a light grey colour, calm with no convection or up welling. The lake temperature is currently 23 ºC. The good conditions also allowed for data to be collected at Ngauruhoe. The gas output from Ngauruhoe is very low so if it’s windy or turbulent we often cannot obtain a result. The carbon dioxide (CO2) value shows an increase but we attribute this mostly to the good conditions. They were not so good during the previous flight.
From the White Island flight we were able to ascertain there has been a decrease in the gas output that ranged 36-55% less than the February result. The wind at the volcano was light and variable; this doesn’t help as the gas is widely dispersed above the volcano and is hard to measure. The airborne data matched the mini DOAS data for the same day. No changes were noted in the Crater Lake.
About our monitoring flights
We use several techniques to monitor and evaluate the volcanic gas output from our active volcanoes. About once a month we plan to make airborne measurements of sulphur dioxide (SO2), carbon dioxide (CO2) and hydrogen sulphide (H2S) outputs from the volcano.
Two DOAS SO2 gas spectrometers are also installed on White Island and under favourable conditions measure the sulphur dioxide (SO2) gas output. We can get data from them 3-5 days a week.
April 11 , 2016.White Island , Ruapehu , Ngauruhoe , New Zealand :
Source : Geonet ( Brad Scott )