LONDON, March 9 (Thomson Reuters Foundation) - It’s a major
natural disaster that slowly grows in one place and then moves
across a region, gaining intensity and size. As it spreads, it
destroys land, ruins agriculture, tears apart communities, and
can kill people.
No, it’s not a hurricane. It’s a drought.
Researchers are just beginning to view droughts as this type
of dynamic force, and some hope that soon they will be monitored
similarly to hurricanes - with scientists able to predict their
development and forecast their paths, helping to protect those
living in their path.
Some 10 percent of droughts travel between 1,400 to 3,100
kilometres from where they begin, according to a recent study.
The study, which analysed 1,420 droughts between 1979 and
2009, identified “hotspots” around the world and common
directions in which droughts move.
Some droughts in the southwest United States, for example,
tend to move from south to north. In Argentina, they usually
migrate the opposite direction. In Central Africa, droughts tend
to go southeastern toward the coast.
“It can start somewhere, move throughout the continent, and
obviously cause harm throughout its way,” Julio Herrera-Estrada,
a PhD candidate at Princeton University and leader of the study,
said on Thursday.
Droughts that travel are usually the largest and most
disastrous, the scientists found.
They can cause a loss of agriculture, wildlife, wetlands and
human life, according to the National Drought Mitigation Center,
based in the United States.
They are also one of the most expensive natural disasters
that people face today, according to Herrera-Estrada, who
collaborated on the study with the International Institute for
Applied Systems Analysis in Vienna.
The most recent moving drought that Herrera-Estrada studied
began in 2008 in Ukraine and Russia, and moved 1,700 km
northeast, ending in northwest Russia and affecting parts of
Kazakhstan on the way. It lasted almost a year.
“People haven't really thought of droughts in this way,” he
told the Thomson Reuters Foundation.
Future research, Herrera-Estrada said, can shed a light on
exactly what mechanisms cause some droughts to move, and what
affects their paths.
This can only be done accurately, however, through
collaboration between national governments, he said.
“It’s important to have a global or a continental
understanding about how droughts are behaving,” he said.
Collaboration “benefits people on the ground, farmers,
cities that need water, power plants that need water".
"We need this cooperation at the international level,” he
The study was published last week in the journal Geophysical
(Reporting by J.D. Capelouto; Editing by Alex Whiting. (Please
credit the Thomson Reuters Foundation, the charitable arm of
Thomson Reuters, that covers humanitarian news, climate change,
resilience, women's rights, trafficking and property rights.