Temperatures this month in London have been warmer than July’s. Scotland is balmier than Barcelona. Artificial snow covers European ski slopes. Africa faces its worst food crisis in a generation as floods and droughts strike vulnerable countries.
With unusual weather from Britain to Australia, scientists are blaming climate change — but also the natural phenomenon called El Nino, which is raising temperatures and disrupting weather patterns. A double whammy then, but how disturbed should we be as the records tumble?
EL NINOS
According to the UK Met Office, the exceptional warmth in Britain and northern continental Europe is linked to the strongest El Nino ever recorded.
“What we are experiencing is typical of an early winter El Nino effect,” said Adam Scaife, head of Met Office long-range forecasting.
The cyclical event, named after the birth of Christ because it traditionally occurs in Latin America around Christmas, sees temperatures in the equatorial Pacific rise several degrees.
The consequences in years like this are dramatic. Monsoons and trade winds are disrupted, leading to cyclones, droughts, floods and food shortages across the world.
The temperature on Friday last week was one of the warmest recorded in the UK in December. With the warm spell due to continue over Christmas, it is almost certain that more records will be broken.
“We cannot attribute the recent floods [in Britain] to the El Nino, but in early winter [during El Nino years] we tend to have a strong jet stream which brings us mild conditions. In late winter, January and February, we tend to get a weak jet stream which brings more wintry conditions,” Scaife said.
WARM WEATHER
“The first 17 days of December have been the mildest on record by a remarkable 1.1°C,” said Roger Brugge, a senior scientist at Reading University’s atmospheric laboratory. “The average temperature during this period, of 10.6°C, is similar to what can be expected around the beginning of May.”
Worldwide, last month was the warmest recorded by the US National Oceanic and Atmospheric Administration (NOAA), and the seventh month in a row where temperatures have been well above the 100-year average; this year is on track to be the warmest year and last week, the Met Office forecast that the global average temperature next year would be a record 1.14°C above pre-industrial temperatures.
So is the current spell of exceptional heat around the world a foretaste of life in a warmer climate, or just a temporary blip? Atmospheric scientists believe we are seeing climate change with an El Nino effect on top. The two combined are raising temperatures dramatically.
“We expect 2016 to be the warmest year ever, primarily because of climate change, but around 25 percent because of El Nino,” said Scaife, who added that El Nino was not linked directly to climate change, but exacerbates its effects.
The effects are already being seen worldwide, and nowhere more dramatically than in east and southern Africa, which is most vulnerable to climate change and extreme droughts.
AFRICAN EMERGENCY
The effect of El Nino has shifted rainfall patterns and led to severe drought. After years of good harvests and relative food security, Africa faces one of its biggest food emergencies in a generation with Ethiopia, Malawi, Eritrea, Somalia, Zimbabwe and other southern and east African countries needing emergency food aid within weeks.
“The projections across Africa are shocking; 39 million people are expected to be affected,” a spokeswoman for the UK Department for International Development said. “Around 3.5 million people in Africa could also be affected by floods and subsequent disease epidemics. The situation in Ethiopia is particularly worrying, with 18 million people projected to require food assistance in the coming months.”
This month, the UN World Food Programme said 2.8 million people in Malawi needed urgent food aid as shortages had more than doubled food prices from last year’s levels. This year, southern Africa’s cereal harvest fell by almost a quarter, down to 34 million tonnes, it said.
“Serious concerns are mounting that southern Africa will this coming season face another poor harvest, possibly a disastrous one,” the UN’s Office for the Coordination of Humanitarian Affairs said.
The UN has appealed for £5.7 billion (US$8.47 billion) for humanitarian aid for Africa. A further £67 million has been requested for Central America, the Pacific region and northern South America, where a combination of intense rains and droughts has devastated crops.
The widespread El Nino effects are being felt in Latin America, as well as Indonesia and Papua New Guinea, where it has led to some of the worst forest fires in decades.
In Central America, one of the most severe droughts on record has led to 3.5 million people in Guatemala, Honduras and El Salvador needing food aid. The UN says that more than 2 million people have been affected in Peru and Ecuador.
The warm Pacific temperatures have also led to a record number of hurricanes and cyclones. According to the NOAA’s Earth Observatory, there were 18 named storms this year, including 13 hurricanes, nine of which were category 3 or higher. This is the greatest number on record since reliable measurements started in 1971.
DAMAGE TO CLIMATE
Each El Nino is different, but this year is being compared with 1997 and 1998, when 21,000 people died and US$36 billion of damage was caused.
Scientists say that El Ninos can add significantly to climate change. Because the phenomenon causes less rain to fall in many areas of the tropics, forests become especially vulnerable to manmade fires, which accelerate carbon dioxide buildup in the atmosphere and reduce air quality.
The tens of thousands of fires that engulfed much of Indonesia this year and led to serious air pollution across the region have been calculated to have emitted more greenhouse gases in one day than is generated from all US economic activity, according to the Washington-based World Resources Institute.
The 1997 fires in Indonesia also produced huge carbon emissions, estimated to be the equivalent of 13 to 40 percent of the world’s annual fossil fuel emissions.
We are nearing “peak El Nino.” The UN’s World Meteorological Organization said it expected the warming of equatorial waters in the Pacific to peak in a few weeks. However, the medium-term consequences are difficult to judge.
UNCHARTED TERRITORY
“This event is playing out in uncharted territory,” World Meteorological Organization Secretary-General Michel Jarraud said.
“Our planet has altered dramatically because of climate change. So this El Nino event and human-induced climate change may interact and modify each other in ways which we have never before experienced. El Nino is turning up the heat even further,” he said.
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