Et rekordvarmt år i 2014 blev ledsaget af tydelige tegn på klimaforandringer verden over. Dette betyder, at vi fremover skal forberede os på nye klimascenarier. Det skriver Verdens Meteorologiske Organisation, WMO, i en status over 2014.
GENEVA, 3. december 2014 (WMO): The year 2014 is on track to be one of the hottest, if not the hottest, on record, according to preliminary estimates by the World Meteorological Organization (WMO).
This is largely due to record high global sea surface temperatures, which will very likely remain above normal until the end of the year.
High sea temperatures, together with other factors, contributed to exceptionally heavy rainfall and floods in many countries and extreme drought in others.
Stigende temperaturer
WMO’s provisional statement on the Status of the Global Climate in 2014 indicated that the global average air temperature over land and sea surface for January to October was about 0.57°C above the average of 14.00°C for the 1961-1990 reference period, and 0.09°C above the average for the past ten years (2004-2013).
If November and December maintain the same tendency, then 2014 will likely be the hottest on record, ahead of 2010, 2005 and 1998. This confirms the underlying long-term warming trend.
It is important to note that differences in the rankings of the warmest years are a matter of only a few hundredths of a degree, and that different data sets show slightly different rankings.
The high January to October temperatures occurred in the absence of a full El Niño-Southern Oscillation (ENSO).
ENSO occurs when warmer than average sea-surface temperatures in the eastern tropical Pacific combine, in a self-reinforcing loop, with atmospheric pressure systems, thus affecting weather patterns globally.
During the year, sea surface temperatures increased nearly to El Niño thresholds but this was not coupled with an atmospheric response. However, many weather and climate patterns normally associated with El Niño/Southern Oscillation (ENSO) were observed in many parts of the world.
Klare tegn på klimaforandringer
“The provisional information for 2014 means that fourteen of the fifteen warmest years on record have all occurred in the 21st century,” said WMO Secretary-General Michel Jarraud. “There is no standstill in global warming,” he said.
“What we saw in 2014 is consistent with what we expect from a changing climate. Record-breaking heat combined with torrential rainfall and floods destroyed livelihoods and ruined lives. What is particularly unusual and alarming this year are the high temperatures of vast areas of the ocean surface, including in the northern hemisphere,” he said.
“Record-high greenhouse gas emissions and associated atmospheric concentrations are committing the planet to a much more uncertain and inhospitable future. WMO and its Members will continue to improve forecasts and services to help people cope with more frequent and damaging extreme weather and climate conditions,” said Mr Jarraud.
The provisional statement was published to inform the annual climate change negotiations taking place in Lima, Peru.
WMO also updated its acclaimed Weather Reports for the Future series, with scenarios for the weather in 2050 based on the Fifth Assessment report from the Intergovernmental Panel for Climate Change, which is co-sponsored by WMO and the UNEP.
Nye klimascenarier
Newly added reports are for Peru, France, Viet Nam, Spain, Canada and Norway, painting a compelling picture of what life could be like on a warmer planet.
Christiana Figueres, Executive Secretary UN Framework Convention on Climate Change (UNFCCC), said: “Our climate is changing and every year the risks of extreme weather events and impacts on humanity rise.”
“Fortunately our political climate is changing too with evidence that governments, supported by investors, business and cities are moving towards a meaningful, universal climate agreement in Paris 2015 — an agreement that keeps a global temperature rise below 2 degrees C by putting in place the pathways to a deep de-carbonisation of the world’s economy and climate neutrality or ‘net zero’ in the second half of the century,” said Ms. Figueres.
Læs den fulde nyhed på WMO’s hjemmeside her
Læs DMI’s rapport om 2014-vejret i Danmark “Rekordvarmt 2014 bekræfter klimaændringer i Danmark”
