The weather change of Alaska is too big and the computer judges that it can not be like that

ByJLS Photography - Alaska

As global warming is being screamed, the importance of weather data such as temperature acquired by observation stations located all over the world is increasing. Meanwhile, in the observation station in Alaska, USA, the change in observational data was too large, the system judged abnormality as "there should not be such", and that observation data provision was stopped It is obvious.

Alaskan North Slope climate change just outran one of our tools to measure it | NOAA Climate.gov
https://www.climate.gov/news-features/blogs/beyond-data/alaskan-north-slope-climate-change-just-outran-one-our-tools-measure

The abnormality was confirmed in the city located at the northernmost tip of AlaskaBarrowIt is an observation station that is installed in. In 2016, the land whose official name was changed to the name "Utqiaġvik" used by indigenous Inuit was located in the Arctic Circle, which is very cold and has a temperature of minus 30 degrees Celsius in winter Sometimes it is less than it is. The average temperature is around 4 degrees Celsius from July to August in the summer, and three-quarters of the year is a harsh environment where the temperature is below freezing.


At observation stations installed in this town, weather observation such as temperature is carried out, and the obtained data is provided to the system which summarizes the observation situation of the whole area. However, the staff who noticed that no data was provided from the latter half of 2016 to December 2017 investigated in detail, and the value of observation data was far too far compared with the value of the year and the actual value in the vicinity , It became clear that the abnormality detection algorithm implemented in the system detected "the possibility that some sort of artificial operation was performed" and stopped providing the data.

The signs of that abnormality are also evident in the relationship between the area of ​​drift ice formed during winter in the Chukchi and Bophoto seas surrounding Alaska and the average temperature of Utokuyugwik. In the graph below, the vertical axis shows the area of ​​drift ice and the horizontal axis shows the average temperature in November of Utokugyvik in Ka, but the lower the average temperature is, the larger the ice freezing area is, whereas when the average temperature is higher It is clearly shown that the ice freezing area is getting smaller as it becomes higher.


More importantly, most of the data since the 2000s is concentrated in the lower right of the graph. There is a close relationship between the temperature and the area of ​​drift ice, which means that the amount of drift ice decreases and the area decreases means that the sea level exposure increases accordingly. And because sea water is higher in temperature than drift ice, it is said that the temperature of the sea is higher than when it is covered with drift ice, raising the situation that the average temperature of the area is raised.

The figure below shows the yearly average temperature of Yutoku Agguic divided into two groups from 1979 to 1999 and from 2000 to 2017 in the graph below. The average temperature from January to September is not very different between the two groups, but there is a clear difference between October and December between 1999 (Maru) and 2000 (Triangle) I understand. In other words, it is shown in this graph that the temperature remained high in September before 1999, while the temperature remained high in December after 2000 .


Also, the signs are evident by looking at the graph below showing the average temperature of Yutoku Agguic. From around 1965, I can see clearly that it shows a clear upward trend, so you can see that the latest data on the far right is jumping greatly from the previous year.


Since it is one phenomenon related to the average temperature only this time, it is not possible to make a judgment about global warming alone by this alone, but it is not possible to change as much as "judge that the computer is abnormal" There is no doubt that it was said that it was observed.