La Nina Has An Impact On Temperature And Precipitation, But Not Climate Change: WMO

Geneva, Nov 30, : The World Meteorological Organisation (WMO), Tuesday pointed out that La Nina developed for the second year consecutively, influencing temperatures, precipitation, and is expected to continue into early 2022.However, it will not have any direct Impact on climate change.
“Despite the cooling effect of this naturally occurring climate phenomenon temperatures in many parts the world are expected be above average due to the accumulated heat trapped inside the atmosphere as a consequence of record high levels greenhouse gases,” WMO stated in a release.

 La Nina Has An Impact On Temperature And Precipitation, But Not Climate Change:

Many areas of land are expected to experience above-average temperatures.

The only exceptions are north-western North America and the Indian subcontinent.

It said that even so, climate-sensitive areas such as agriculture, water resources, and disaster management will be affected.

“The cooling effect of the 2020/2021 La Nina, which is usually felt in the second-half of the event, means that 2021 will not be THE warmest year but tenth.This temporary respite does not reverse the long-term warming trend nor reduce the urgency for climate action,” stated Professor Petteri Taalas, WMO Secretary General.

La Nina is a large-scale cooling in the ocean surface temperatures in central and eastern equatorial Pacific Ocean.It is also accompanied by changes in the tropical atmospheric circulation (winds, pressure, and rain).

It has often the opposite effect on weather and climate to El Nino, which is the warm phase the El Nino Southern Oscillation.

This ENSO is the primary driver of climate variability that naturally occurs and the main source for seasonal climate predictability.

According to the Intergovernmental Panel on Climate Change’s latest Assessment Report (AR6 WRI), ENSO precipitation variability on a regional scale is likely to increase in a warmer world.

El Nino and La Nina do not have to be the only factors.

No two El Nino or La Nina events are alike.WMO now publishes a monthly Global Seasonal Climate Update, (GSCU), to provide more actionable information to decision makers.

According to the WMO Update, there is a high likelihood (90%) that the tropical Pacific sea surface temperatures will remain at La Nina levels up to the end of 2021 and a moderate possibility (70-100%) for them to maintain their La Nina levels through 2022.This forecast is based on WMO Global Producing Centers of Long-Range Weather Forecasts and expert interpretation.


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