“….So what is driving
the bleak outlook for the next five years? An expected El Niño, on
top of the overall global warming trend, will likely push the global
temperature to record levels. Has the Paris Agreement already failed
if the global average temperature exceeds the 1.5℃ threshold in one
of the next five years? No, but it will be a stark warning of what’s
in store if we don’t quickly reduce emissions to net zero.”
[Dr
Andrew King,
Climate Extremes Research Fellow, School of Earth Sciences, Faculty
of Science, University of Melbourne, writing
in The
Conversation
on 17 May 2023]
World
Meteorological Organization (WMO),
media
release, 17 May 2023:
Global
temperatures set to reach new records in next five years
Geneva,
17 May 2023 (WMO) – Global temperatures are likely to surge to
record levels in the next five years, fuelled by heat-trapping
greenhouse gases and a naturally occurring El Niño event, according
to a new
update issued by the World Meteorological Organization (WMO).
There
is a 66% likelihood that the annual average near-surface global
temperature between 2023 and 2027 will be more than 1.5°C above
pre-industrial levels for at least one year. There is a 98%
likelihood that at least one of the next five years, and the
five-year period as a whole, will be the warmest on record.
“This
report does not mean that we will permanently exceed the 1.5°C level
specified in the Paris Agreement which refers to long-term warming
over many years. However, WMO is sounding the alarm that we will
breach the 1.5°C level on a temporary basis with increasing
frequency,” said WMO Secretary-General Prof. Petteri Taalas.
“A
warming El Niño is expected to develop in the coming months and this
will combine with human-induced climate change to push global
temperatures into uncharted territory,” he said. “This will have
far-reaching repercussions for health, food security, water
management and the environment. We need to be prepared,” said Prof.
Taalas.
There
is only a 32% chance that the five-year mean will exceed the 1.5°C
threshold, according to the Global Annual to Decadal Climate Update
produced by the United Kingdom’s Met Office, the WMO lead centre
for such predictions.
The
chance of temporarily exceeding 1.5°C has risen steadily since 2015,
when it was close to zero. For the years between 2017 and 2021,
there was a 10% chance of exceedance.
“Global
mean temperatures are predicted to continue increasing, moving us
away further and further away from the climate we are used to,”
said Dr Leon Hermanson, a Met Office expert scientist who led the
report.
Key
points
> The
average global temperature in 2022 was about 1.15°C above the
1850-1900 average. The cooling influence of La Niña conditions over
much of the past three years temporarily reined in the longer-term
warming trend. But La Niña ended in March 2023 and an El Niño is
forecast to develop in the coming months. Typically, El Niño
increases global temperatures in the year after it develops – in
this case this would be 2024.
> The
annual mean global near-surface temperature for each year between
2023 and 2027 is predicted to be between 1.1°C and 1.8°C higher
than the 1850-1900 average. This is used as a baseline because it was
before the emission of greenhouse gases from human and industrial
activities.
> There
is a 98% chance of at least one in the next five years beating the
temperature record set in 2016, when there was an exceptionally
strong El Niño.
> The
chance of the five-year mean for 2023-2027 being higher than the last
five years is also 98%.
> Arctic
warming is disproportionately high. Compared to the 1991-2020
average, the temperature anomaly is predicted to be more than three
times as large as the global mean anomaly when averaged over the next
five northern hemisphere extended winters.
> Predicted
precipitation patterns for the May to September 2023-2027 average,
compared to the 1991-2020 average, suggest increased rainfall in the
Sahel, northern Europe, Alaska and northern Siberia, and reduced
rainfall for this season over the Amazon and parts of Australia.
Paris
Agreement
In
addition to increasing global temperatures, human-induced greenhouse
gases are leading to more ocean heating and acidification, sea ice
and glacier melt, sea level rise and more extreme weather.
The
Paris Agreement sets long-term goals to guide all nations to
substantially reduce global greenhouse gas emissions to limit the
global temperature increase in this century to 2 °C while pursuing
efforts to limit the increase even further to 1.5 °C, to avoid or
reduce adverse impacts and related losses and damages.
The
Intergovernmental Panel on Climate Change says that climate-related
risks for natural and human systems are higher for global warming of
1.5 °C than at present, but lower than at 2 °C.
The
new report was released ahead of the World Meteorological Congress
(22 May to 2 June) which will discuss how to strengthen weather and
climate services to support climate change adaptation. Priorities for
discussion at Congress include the ongoing Early Warnings for All
initiative to protect people from increasingly extreme weather and a
new Greenhouse Gas Monitoring Infrastructure to inform climate
mitigation.
Ensemble
mean forecast 2023-2027
Notes
For Editors:
The
Global Annual to Decadal Update is one of a suite of WMO climate
products, including the flagship State of the Global Climate, which
seek to inform policy-makers. WMO will release its provisional
statement on the State of the Global Climate in 2023 at the UN
Climate Change Conference, COP28, in December.
The
UK’s Met Office acts as the WMO Lead Centre for Annual to DecadalClimate Prediction. This year there are 145 ensemble members
contributed by 11 different institutes to the predictions, which
start at the end of 2022. Retrospective forecasts, or hindcasts,
covering the period 1960-2018 are used to estimate forecast skill.
Confidence
in forecasts of global mean temperature is high since hindcasts show
very high skill in all measures.
The
forecasts shown here are intended as guidance for Regional Climate
Centres (RCCs), Regional Climate Outlook Forums (RCOFs) and National
Meteorological and Hydrological Services (NMHSs). It does not
constitute an official forecast for any region or nation, but RCCs,
RCOFs and NMHSs are encouraged to appropriately interpret and develop
value-added forecasts from this Climate Update.
The
World Meteorological Organization is the United Nations System’s
authoritative voice on Weather, Climate and Water
~~~~~~~~~~~~~~~~~
Excerpts
from WMO
Global Annual to Decadal Climate Update: Target years: 2023 and
2023-2027 specifically mentioning Australia:
the
1991-2020 average, suggest an increased chance of above average
rainfall in the Sahel, northern Europe, Alaska and northern Siberia,
and reduced rainfall for this
season over the Amazon and parts of Australia.
Near-surface
temperatures in 2023 are likely to be higher than the 1991-2020
average in almost all regions except for Alaska, South Africa, South
Asia and parts of Australia
(Figure 7). Parts of the South Pacific Ocean are likely to be cooler
than average. Skill is estimated from hindcasts to be medium or high
in most regions (Figure 8) giving medium to high confidence in the
forecast…..
This
section shows predictions for the average of the next five extended
seasons for May to September and
November to March.
For
the May to September average, predicted temperature patterns over the
years 2023-2027 show a high probability of temperatures above the
1991-2020 average almost everywhere, with enhanced warming over land
(Figure 9). Skill is very high in most regions, giving high
confidence in this prediction (Figure 10). For the same season,
sea-level pressure is predicted to be anomalously low over the
Mediterranean and surrounding countries, and high over the maritime
continent and surrounding countries.
There
is medium skill for most of these regions, giving medium confidence.
Predictions
of precipitation show wet anomalies in the Sahel, northern Europe,
Alaska and northern Siberia, and dry anomalies for this season over
the Amazon and western Australia. Skill is low to medium for these
regions, giving low to medium confidence.
For
the November to March average over the years 2023/24-2027/28 (Figure
11), the predictions show warm anomalies are likely almost
everywhere, with land temperatures showing larger anomalies than
those over the ocean. The Arctic (north of 60°N) near-surface
temperature anomaly is more than three times as large as the global
mean anomaly. The North Atlantic subpolar gyre shows negative
anomalies, the so-called warming hole, which has been liked to a
reduction in the AMOC. Skill is high in most regions apart from parts
of the North Pacific, some areas in Asia, Australia, and the Southern
Ocean (Figure 12), giving medium to high confidence…..
NOTE: My yellow highlighting throughout this post