Why is it particularly warm this year?

Climate scientists of the National Oceanic and Atmospheric Administration (NOAA) officially announced in the latest issue of Science and Technology Bulletin on March 12 that the El Ni? o event will come again, and 20 15 may become the hottest year on record.

El Nino strengthens global warming trend.

According to American media reports, scientists published the whole process of making this judgment on their official blog.

NOAA wrote on his blog: In the past few months, scientists have observed the highest average sea level temperature in the tropical Pacific Ocean. The observation object includes the sea level temperature in Nino 3.4 area, which is considered as an indicator of the occurrence of El Ni? o phenomenon. Since last September, the seasonal Nino 3.4 index has increased by more than 0.5℃. In recent weeks, the Nino 3.4 index has risen by more than 0.6℃.

In addition, the atmospheric conditions observed by scientists also indicate that El Ni? o is happening. So after months of prediction, NOAA officially announced that El Nino had arrived. And this will definitely make the warming world hotter.

This year may last longer.

El Nino phenomenon will transfer huge heat from the ocean to the atmosphere. Therefore, it is conceivable that this year's El Ni? o may strengthen the global warming trend if it is combined with the already warming global ocean. Another slow data-PDO index (also known as "la madre phenomenon") also reached record-breaking levels in February last year at 65438+ and this year at1October at 65438+.

If PDO is maintained at a high level, the El Ni? o phenomenon will be fundamentally strengthened, which may make 20 15 the hottest year since the climate record was recorded.

Usually, El Nino events only last six to eight months, but this year's El Nino duration may increase to two years or more.