While it is «likely» that anthropogenic influences are behind the changes in cold days and warm days, there is only «medium confidence» that they are behind
changes in extreme rainfall events, and «low confidence» in attributing any changes in tropical cyclone activity to greenhouse gas emissions or anything else humanity has done.
A group of researchers from Germany has taken to investigating the potential
changes in extreme rainfall patterns across the UK as a result of future global warming and has found that in some regions, the time of year when we see the heaviest rainfall is set to shift.
Not exact matches
Climate
change is «playing an increasing role
in the increasing frequency of some types of
extreme weather that lead to billion - dollar disasters, most notably the rise
in vulnerability to drought, lengthening wildfire seasons and the potential for extremely heavy
rainfall and inland flooding,» Smith said.
Growing scarcity
In addition to a growing scarcity of natural resources such as land, water and biodiversity «global agriculture will have to cope with the effects of climate
change, notably higher temperatures, greater
rainfall variability and more frequent
extreme weather events such as floods and droughts,» Diouf warned.
While the trends associated with climate
change — hotter days, heavier
rainfall and a greater number of
extreme weather events — are present
in the models, for many crops
in Africa and Asia it's not clear how extensive the effects will be.
New Zealand experienced an
extreme two - day
rainfall in December 2011; researchers said 1 to 5 percent more moisture was available for that event due to climate
change, which is increasing the amount of water vapor
in the atmosphere.
Climate
change caused by rising concentrations of greenhouse gases
in the atmosphere is causing more
extreme rainfall and snowfall — and floods
When
in January
rainfall was double the expected average over wide areas, many people made cautious links between such
extreme weather and global climate
change.
Loecke and co-author Amy Burgin, associate professor of environmental studies, said the
extreme flux between drought and
rainfall changes the storage of nutrients
in the agricultural landscape — nitrogen used
in fertilizing farms most importantly.
The indications of climate
change are all around us today but now researchers have revealed for the first time when and where the first clear signs of global warming appeared
in the temperature record and where those signals are likely to be clearly seen
in extreme rainfall events
in the near future.
Although it has been previously documented that overall monsoon
rainfall has lessened, few researchers have found
changes in extremes.
Overall, the chances of seeing a
rainfall event as intense as Harvey have roughly tripled - somewhere between 1.5 and five times more likely - since the 1900s and the intensity of such an event has increased between 8 percent and 19 percent, according to the new study by researchers with World Weather Attribution, an international coalition of scientists that objectively and quantitatively assesses the possible role of climate
change in individual
extreme weather events.
Dr Stephen Grimes of Plymouth University, who initiated the research project, highlighted the climate
changes that must have caused this increase
in sediment erosion and transport — «We have climate model simulations of the effect of warming on
rainfall during the PETM event, and they show some
changes in the average amounts of
rainfall, but the largest
change is how this
rainfall is packaged up — it's concentrated
in more rapid,
extreme events — larger and bigger storms.»
«Observing
rainfall in an El Niño year is especially interesting because the prevailing precipitation patterns
change, often
in extreme ways.
«When you take a very, very rare,
extreme rainfall event like Hurricane Harvey, and you shift the distribution of rain toward heavier amounts because of climate
change, you get really big
changes in the probability of those rare events,» Emanuel says.
«Snowfall
extremes still occur
in the same narrow temperature range with climate
change, and so they respond differently to climate
change compared to
rainfall extremes or average snowfall.»
Such trends mean scientists and policymakers will have to factor
in how synthetic climate forcers other than greenhouse gases will
change temperature,
rainfall and weather
extremes.
Under the Obama administration, climate
change has been on the Department of Defense's radar from how it affects national security to how military installations around the world should prepare for climate impacts, like sea level rise at naval bases, melting permafrost
in the Arctic and more
extreme rainfall events around the world.
Lead author Dr Nathalie Schaller of Oxford University's Department of Physics said: «We found that
extreme rainfall, as seen
in January 2014, is more likely to occur
in a
changing climate.
Co-author Dr Alison Kay from the Centre for Ecology & Hydrology said: «Our hydrological modelling suggests that the increased likelihood of
extreme rainfall arising from human - made climate
change gives a more modest increase
in extreme flows
in the River Thames.
Various studies predict an average 30 percent reduction
in farm incomes due to climate
change impacts, including greater
extremes in temperatures and
rainfall (floods, droughts) and the emergence of new pest and disease strains.
In Canada, an
extreme rainfall event, made worse by a stalled weather system likely powered by an unstable Arctic and climate
change, has closed down the country's oil trading capital.
NASA
in America, hardly a radical source, confirms we can expect more
extreme rainfall events due to climate
change.
For example, the
extreme drought that gripped Indonesia during summer and fall (leading to an intense wildfire season) was caused by a dearth of
rainfall linked to El Niño and higher temperatures linked to climate
change, one study
in the report found.
In 2014, Climate Central helped create the World Weather Attribution (WWA) initiative, a groundbreaking international effort to analyze and communicate the possible influence of climate
change on
extreme weather events such as storms,
extreme rainfall, heat waves, cold spells, and droughts.
«The recent study suggests that the
extreme rainfall component of Hurricane Harvey was made 15 % more intense due to climate
change, which is broadly
in agreement with the atmospheric theory that has been developed
in this area.
«Harvey was not caused by climate
change, yet its impacts — the storm surge, and especially the
extreme rainfall — very likely worsened due to human - caused global warming,» said Stefan Rahmstorf, a researcher with the Potsdam Institute for Climate Impact Research,
in a statement.
Climate
change could mean England is in for more such extreme rainfall events because of increasing moisture in the atmosphere and changes in atmospheric weather patterns, a new study detailed online Monday in the journal Nature Climate Change
change could mean England is
in for more such
extreme rainfall events because of increasing moisture
in the atmosphere and
changes in atmospheric weather patterns, a new study detailed online Monday
in the journal Nature Climate
Change Change finds.
However, simple statistical reasoning indicates that substantial
changes in the frequency of
extreme events (and
in the maximum feasible
extreme, e.g., the maximum possible 24 - hour
rainfall at a specific location) can result from a relatively small shift of the distribution of a weather or climate variable.
The pattern of
rainfall in the spring is characteristic of La Niña although the
extreme nature of the
changes is not.
Dean, Sam M., Suzanne Rosier, Trevor Carey - Smith and Peter A. Stott, 2013: The role of climate
change in the two - day
extreme rainfall in Golden Bay, New Zealand, December 2011 [
in «Explaining
Extreme Events of 2012 from a Climate Perspective»].
The role of climate
change in causing
extreme heat waves, drastic
rainfall, negative impacts on human health and threatened food security have received more attention recently than megadrought.
It's difficult to say for certain that a particular
extreme event for the monsoon is attributable to anthropogenic climate
change — like the Pakistan floods of 2010 — but we do know that with a warming climate more moisture can be held
in the atmosphere, leading to heavier
rainfall when it does occur.
For example, let's say that evidence convinced me (
in a way that I wasn't convinced previously) that all recent
changes in land surface temperatures and sea surface temperatures and atmospheric temperatures and deep sea temperatures and sea ice extent and sea ice volume and sea ice density and moisture content
in the air and cloud coverage and
rainfall and measures of
extreme weather were all directly tied to internal natural variability, and that I can now see that as the result of a statistical modeling of the trends as associated with natural phenomena.
The relationship between SSTs and spatial gradients
in changes in (
extreme) precipitation is an important finding for analysing necessary measures to anticipate future
changes in the spatial and temporal distribution of
rainfall in the country.
People are already experiencing the impacts of climate
change through slow onset
changes, for example sea level rise and greater variability
in the seasonality of
rainfall, and through
extreme weather events, particularly
extremes of heat,
rainfall and coastal storm surges.
According to a study published
in the latest Bulletin of the American Meteorological Society (BAMS) special issue on attribution, climate
change did not contribute to the
extreme five - day
rainfall event that caused the floods.
Worldwide there will likely be an average increase
in the maximum wind speed of tropical cyclones (hurricanes and typhoons) of 2 to 11 %.6 Because of the way
extremes respond to
changes such as these, Category 4 and 5 hurricanes are expected to nearly double
in number by the end of the century.7 The rate of
rainfall associated with tropical cyclones, an important factor
in flooding, is expected to increase approximately 20 % within 100 km of the center of these storms.8
«The CCR - II report correctly explains that most of the reports on global warming and its impacts on sea - level rise, ice melts, glacial retreats, impact on crop production,
extreme weather events,
rainfall changes, etc. have not properly considered factors such as physical impacts of human activities, natural variability
in climate, lopsided models used
in the prediction of production estimates, etc..
Also,
changes in the frequency of other, smaller scale weather
extremes, notably droughts, heat waves, wildfires, and
extreme rainfall, although they have not been specifically assessed here, can occur.
Their work, published
in the journal Reviews of Geophysics, summarizes current research on the analysis of future
changes to the intensity, duration and frequency of short - duration
extreme rainfall.
«Snowfall
extremes still occur
in the same narrow temperature range with climate
change, and so they respond differently to climate
change compared to
rainfall extremes or average snowfall.»
Rigorous scientific analysis has found that the
extreme rainfall that caused a Texas flooding
in May of 2015, for example, was caused by a fairly typical
rainfall pattern associated with that year's El Niño, a naturally occurring climate cycle, which had been supercharged by human - made climate
change.
Publishing
in the Reviews of Geophysics, Westra et al (2014) summarize the current state of research
in the analysis of future
changes to the intensity, frequency and duration of
extreme rainfall.
In the first decade of the new millennium, extreme rainfall events combined with changes in land use have resulted in an increase in floods and an increase in annual average flood losses from $ 6 billion to $ 10 billion despite the billions of dollars invested in flood contro
In the first decade of the new millennium,
extreme rainfall events combined with
changes in land use have resulted in an increase in floods and an increase in annual average flood losses from $ 6 billion to $ 10 billion despite the billions of dollars invested in flood contro
in land use have resulted
in an increase in floods and an increase in annual average flood losses from $ 6 billion to $ 10 billion despite the billions of dollars invested in flood contro
in an increase
in floods and an increase in annual average flood losses from $ 6 billion to $ 10 billion despite the billions of dollars invested in flood contro
in floods and an increase
in annual average flood losses from $ 6 billion to $ 10 billion despite the billions of dollars invested in flood contro
in annual average flood losses from $ 6 billion to $ 10 billion despite the billions of dollars invested
in flood contro
in flood control.
A pronounced shift can be seen
in extreme rainfall events, heat waves and wind storms and the underlying reason is climate
change, says Muir - Wood, driven by rising greenhouse gas emissions.
Meanwhile, there was just «medium confidence» that man is responsible for
extreme rainfall changes and «low confidence» that variations
in tropical cyclones could be attributed to humanity's relatively insignificant carbon emissions.
The Agriculture Department will have to deal with droughts and
changing rainfall patterns, but its employees have been barred from even discussing the problem openly, as leadership has instructed them to use «weather
extremes» instead of «climate
change»
in reports.
Shows that the
changes in discharge
extremes are related to the regional pluriannual
rainfall variability and the associated atmospheric circulation as well as to tropical large - scale climatic indicators
The map (above) shows predicted
changes in the annual number of days of
extreme rainfall (defined as
rainfall totals
in excess of the historic 98th percentile) across the United States by 2041 - 2070 as compared to 1971 - 2000 if greenhouse gases continue to increase at a high rate (A2 scenario).