A groundbreaking study has found that rainfall in the Arabian Peninsula was five times more extreme just 400 years ago, underscoring the urgent need for climate preparedness as rapid urbanization reshapes the region.
Published in Science Advances, the study titled “A 1,600-Year Record of Extreme Rainfall in Northern Arabia,” suggests that the region was far wetter over the past two millennia. Once a thriving savannah teeming with lions, leopards, and wolves, Arabia’s landscape was a stark contrast to the arid desert we know today.
“As major development projects like NEOM in Saudi Arabia continue to transform the region, these findings highlight the critical need for stronger climate resilience and disaster preparedness,” said lead author Sam Purkis, professor and chair of the Department of Marine Geosciences at the University of Miami Rosenstiel School.
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To reconstruct Arabia’s climate past, researchers deployed a remotely operated vehicle (ROV) from the research vessel OceanXplorer to extract sediment cores from a deep-sea brine pool in the Gulf of Aqaba, an extension of the northern Red Sea. The brine’s unique chemistry preserved undisturbed sediment layers, offering an exceptionally accurate record of rainfall patterns dating back to the Late Holocene.
“Leveraging the technology aboard OceanXplorer, along with multidisciplinary expertise in ocean and climate science, allows us to better understand how ocean systems influence long-term weather and climate trends—helping at-risk regions prepare for the future,” said Mattie Rodrigue, science program director at OceanX.
The study revealed that the region was not only wetter 2,000 years ago but also saw twice as much rainfall just 200 years ago compared to today.
“Our deep-sea records show that past rainfall levels were more than double what they are today. Historical accounts also suggest a much wetter Arabia in ancient times,” wrote authors in their paper, citing the following records.
In 167 BC, Agatharchides of Cnidus traveled along the Saudi coast of the Red Sea. In what is now the NEOM region, he described an area rich in wildlife, including lions, leopards, and wolves, as well as towering lotus plants. The presence of large carnivores suggests that the region must have had abundant vegetation, as lions depend on large herbivores for food.
Revealing four wet periods, the authors said, “Our sediment cores provide climate data from 500 CE onward — the beginning and end of the Medieval Warm Period and the start and mid-point of the Little Ice Age.” The wettest of these was the onset of the Little Ice Age, between 1400 and 1550 CE. During this time, flash floods were five times more frequent than today, annual rainfall was four to five times higher, and the accumulation of land-derived mud increased tenfold, asserted the research team.
“This research fills a critical gap in the history of Middle Eastern climate,” said Amy Clement, professor in the Department of Atmospheric Sciences at the University of Miami Rosenstiel School. “It clearly demonstrates that both average conditions and extreme weather patterns can shift dramatically, making the assumption of climate stability in future development a risky one.”
The April 2024 Floods: A Wake-Up Call
Ironic but the study’s findings come as the Middle East grapples with increasingly erratic weather. The catastrophic floods that struck the Arabian Peninsula in April 2024—when more than a year’s worth of rain fell in a single day—remain fresh in memory.
The torrential downpour submerged highways and airport runways in Dubai, killing 21 people across the UAE and Oman. Initially, the event was blamed on cloud seeding, a weather modification technique used to enhance rainfall. However, experts quickly dismissed this theory, pointing instead to an alarming shift in climate patterns.
“Don’t blame Dubai’s freak rain on cloud seeding—the storm was far too big to be human-made,” said Richard Washington, professor of climate science at the University of Oxford. While the UAE has been conducting cloud seeding experiments for years, Washington clarified that the storm system on April 16 was far too massive to have been artificially induced.
“So could seeding have built a storm system the size of France? That would be like a breeze stopping a speeding train,” he explained. “And no seeding flights had even taken place that day. The deep, large-scale clouds that formed on April 16 are not the target of such experiments.”
Region at Crossroads of Climate Change
The 2024 floods were a stark reminder of how unpredictable weather patterns are becoming. Now, the revelation that Arabia’s climate was far wetter centuries ago raises new questions about its long-term stability.
The Arabian Desert, spanning most of Saudi Arabia and parts of Iraq, Jordan, Qatar, the UAE, Oman, and Yemen, remains highly vulnerable to both extreme rainfall and prolonged droughts. Today, most of the region receives just 100 millimeters (3.9 inches) of annual rainfall, though some areas see as little as 30 to 40 millimeters (1.6 inches).
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With sunshine dominating up to 77.6% of daylight hours and visibility often reduced by dust and humidity, the region remains one of the most arid on Earth. Yet, the past suggests that its climate has not always been this dry—and may not remain so in the future.
As Arab cities expand and megaprojects rise, understanding past climate variability is no longer just an academic pursuit.