You are here: Home » PTI Stories » National » News
Business Standard

Global warming never stopped in last hundred years: Study


Press Trust of India  |  Beijing 

Global warming has never stopped in the past hundred years, with maximum rate of change occurring after Second World War II, according to a study.

"Our study suggests that future climate conditions will likely rely on competition between multidecadal cooling and global warming if the multidecadal climate cycle repeats," said Xingang Dai from the Chinese Academy of Sciences.

Global warming has been attributed to persistent increases in atmospheric greenhouse gasses (GHGs), especially in CO2, since 1870, the beginning of the Industrial Revolution, according to the study published in the journal Scientific Reports.

The upward trend in global mean surface temperature (GMST) slowed or even paused during the first decade of the twenty-first century, even though CO2 levels continued to rise and reached nearly 400 parts per million (ppm) in 2013.

This episode has typically been termed the global warming hiatus or slowdown in warming.

The hiatus is characterised as a near-zero trend over a period.

Detection found that the hiatus appeared during 2001-2013/2002-2012 with extremely weak inter-annual variability in some GMST sequences, and the slowdown in the others, researchers said.

The hiatus is often attributed to internal climate variability, external forcing, or both, involving an increase in aerosols in the stratosphere during the period 2000-2010, they said.

The phase saw Interdecadal Pacific Oscillation (IPO) accompanying intensified trade winds, extensive heat uptake by the deep ocean or an extremely low number of sunspots during the latest solar activity cycle.

The new study reveals that the global warming has never stopped in the past hundred years, with maximum rate of change after Second World War II and almost constant rate during the latest three decades.

However, the key cooling against global warming comes from the interannual variability of the temperature that is coincided with the variability of the sea surface temperature in the equatorial mid-eastern Pacific.

Hence, the hiatus is merely a decadal balance between global warming and the cooling resulting from anomalous sea surface temperature in equatorial Pacific.

The hiatus ended in 2014 as a new El Nino Southern Oscillation (ENSO) event was developing in the equatorial mid-eastern Pacific which caused a rapid warming in the Earth, researchers said.

On the other hand, the multidecadal climate oscillation follows a downward path with increase in cooling, they said.

(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)

Dear Reader,

Business Standard has always strived hard to provide up-to-date information and commentary on developments that are of interest to you and have wider political and economic implications for the country and the world. Your encouragement and constant feedback on how to improve our offering have only made our resolve and commitment to these ideals stronger. Even during these difficult times arising out of Covid-19, we continue to remain committed to keeping you informed and updated with credible news, authoritative views and incisive commentary on topical issues of relevance.
We, however, have a request.

As we battle the economic impact of the pandemic, we need your support even more, so that we can continue to offer you more quality content. Our subscription model has seen an encouraging response from many of you, who have subscribed to our online content. More subscription to our online content can only help us achieve the goals of offering you even better and more relevant content. We believe in free, fair and credible journalism. Your support through more subscriptions can help us practise the journalism to which we are committed.

Support quality journalism and subscribe to Business Standard.

Digital Editor

First Published: Wed, November 14 2018. 14:30 IST