Our directory of things of interest

University Directory

New web maps tell full story of climate change

New web maps tell full story of climate change
11 Apr
New interactive maps combine precipitation and temperature to show climate change in more detail and can be used to compare climates worldwide

Climate change maps usually fall into one of two categories: maps that show changes in precipitation, and maps that show changes in temperature. Unfortunately, focusing on one of these factors only tells half of the story. For example, a map of global temperature increase would show a warming Arctic, but it would not show the decrease in rainfall predicted to impact West Africa. Now, researchers at the University of Cincinnati have created a map that shows both.

‘Our goal was to create a web-based app that is relatively easy to use by everyone,’ says Tomasz Stepinski, geography and geospatial professor at the university. ‘When people think about climate change, they think about temperature – global warming. But climate has many components, including precipitation.’ The new map, called ClimateEx, combines precipitation and temperature from the WorldClim project. It shows how local climates have changed since the beginning of the Holocene (6,000 years ago) and how they are predicted to change until the year 2070.

Using the map in its most basic form shows how the impact of climate change is unequal across the planet. Brown and white colours show where most change will happen – such as the southern tip of Greenland, Central America and South East Asia. Meanwhile, the green hues across much of the northern hemisphere indicate less change in those regions.

Screen shot 2018 04 11 at 10.40.14Regions with white and brown colour show the most climate change between 2000 and 2070

When the user looks at specific locations, the map shows climates with circular illustrations. Each dot represents the monthly rainfall and temperature for the location (with green dots showing January, to mark a comparative starting point). The annual climates of different locations can be compared by testing the similarity of these shapes. For example, here is the predicted climate of Cardiff in 2070 compared to the very different climate of Lagos, Nigeria:



But if we search the entire globe, we can find Cardiff’s climate ‘twins’, such as locations in British Columbia, Canada, the eastern United States, areas of eastern Argentina, and parts of southeast Australia and New Zealand (displayed in brown):

cardiff worldAreas of the world with a similar climate to Cardiff in the year 2070

cardiff ozAreas of Australia and New Zealand showing a similar climate to Cardiff in 2070

Stepinski demonstrates how this can be used to search for specific climate types, such as those which are susceptible to tornadoes. ‘I know that Oklahoma is at the centre of the “Tornado Valley” region,’ he explains. ‘By doing a spatial search I may identify other regions in the world prone to tornadoes. The resulting map reveals that a region stretching across northern Argentina, Paraguay and southern Brazil is climatically similar. This region is indeed known to be prone to tornadoes.’

tornadosAreas probably prone to tornados, based on climate similarity with Oklahoma, US

Stepinski hopes the tool can be used to educate the public about how local climates are changing relative to each other, and that it is happening quickly. ‘The climate is always changing,’ he says. ‘But it usually changes on a geological timescale. It’s not surprising that the climate today is different from the climate a half-million years ago. But now we’re experiencing changes on a scale of 100 years. That’s a completely different thing.’

Before ClimateEx, Stepinski created new, high-detailed maps of the United States, which revealed persistent racial segregation in cities.


red line


Geographical Week

Get the best of Geographical delivered straight to your inbox by signing up to our free weekly newsletter!

red line

Related items

Geographical Week

Get the best of Geographical delivered straight to your inbox every Friday.

Subscribe to Geographical!

University of Winchester


Aberystwyth University University of Greenwich The University of Derby




Travel the Unknown


Like longer reads? Try our in-depth dossiers that provide a comprehensive view of each topic

  • The Human Game – Tackling football’s ‘slave trade’
    Few would argue with football’s position as the world’s number one sport. But as Mark Rowe discovers, this global popularity is masking a sinister...
    Essential oil?
    Palm oil is omnipresent in global consumption. But in many circles it is considered the scourge of the natural world, for the deforestation and habita...
    Hung out to dry
    Wetlands are vital storehouses of biodiversity and important bulwarks against the effects of climate change, while also providing livelihoods for mill...
    National Clean Air Day
    For National Clean Air Day, Geographical brings together stories about air pollution and the kind of solutions needed to tackle it ...
    REDD+ or Dead?
    The UN-backed REDD+ (Reducing Emissions from Deforestation and Forest Degradation) scheme, under which developing nations would be paid not to cut dow...


NEVER MISS A STORY - Follow Geographical on Social

Want to stay up to date with breaking Geographical stories? Join the thousands following us on Twitter, Facebook and Instagram and stay informed about the world.

More articles in PLACES...


Biosphere 2 was one of the most ambitious experiments in…


High-quality, affordable drones can revolutionise the way that landscape and…


Benjamin Hennig charts the impact of volcanoes on nearby human…


A volunteer-led digital mapping project is at the heart of…


As the planet urbanises, attention is turning towards the most…


Palm oil is omnipresent in global consumption. But in many…


A rising number of cruise ships and their ‘overlooked’ diesel…


Benjamin Hennig charts the growth and impact of the world’s…


Long-term studies reveal the Sahara desert has expanded substantially over…


South America’s wealthiest economy is at a crossroads between environmental…


The European Court of Justice finds the logging of a…


In this extract from his new book, Tides, mountain climber…


New data from the World Health Organization reveals that nine…


In the wake of the water crisis in Flint, Michigan,…


Benjamin Hennig maps out the global production and distribution levels…


Millions of Americans are living in areas at high-risk of…


New interactive maps combine precipitation and temperature to show climate…


Public transport in India could be on the verge of…


To retrace the route of the fur voyageurs on the waterways…


IPCC Cities and Climate Change Conference: Alberta host dresses non-renewable…