Global land evaporation increased by 10 percent from 2003 to 2019

By comparison, rainfall increased by 3% and discharge decreased by 6% over the same period, relative to their long-term average, the study said.

Ground Report | New Delhi: A recent research has shown that between 2003 and 2019, the rate of evapotranspiration has increased by 10 percent globally. For this, scientists are taking the responsibility of increasing the temperature globally. It has a direct impact on the water cycle of the Earth, because evaporation is one of its major components. NASA’s Jet Propulsion Laboratory and lead researcher Madeleine Pascolini-Campbell have reported that since 2003, evaporation has increased by about 10 percent, much higher than previously estimated, and behind it. The reason for this is the increasing temperature of the Earth. He hoped that this information about the water cycle could help in the development and validation of climate models.

Warming land

Plants and land surfaces release moisture through evaporation and evaporation in the air, these processes are jointly called evaporation-evaporation. It is important to note that when moisture from the soil, land and water surface turns into vapor, it is called evaporation. At the same time, the process of removing unnecessary water of plants in the form of vapor is called evaporation.

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The authors find a “statistically significant” increase in evaporation of 2.3 mm per year compared to 2003–19 – corresponding to an increase of about 10% over the long-term average. According to the study, these findings “are consistent with the hypothesis that warmer climate should increase global evaporation.”

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Study published in Nature have found that the change is primarily driven by the warming of the world’s land surface. This confirms a long-standing theory that, as the climate warms up in the future, the water cycle will receive energy and “accelerate”. By comparison, rainfall increased by 3% and discharge decreased by 6% over the same period, relative to their long-term average, the study said.

For the past several years, scientists have been predicting that our planet is heating up due to the increase in global temperature, which is also having an impact on the Earth’s water cycle and it is consuming more amount of energy but it is not. This is easy to prove, because there is no reliable way to measure evaporation.

In this recent research, scientists have calculated growth using observations and data from GRACE (Gravity Recovery and Climate Experiment) and Grace FO satellites. By assessing the large-scale changes of water between oceans and continents, researchers have found that this rate of increase in evepo-transpiration is two times higher than previous estimates.

Water gravity

Since water has mass, it contributes to the Earth’s gravitational signals. Grace satellites are highly sensitive to the movement of water around the world, due to which they measure changes in ice sheets, changes in water stored on land and also the mass of the ocean.

By calculating on this basis, scientists have found that while the evaporation in 2003 was 405 millimeters (about 16 inches), in 2019 it increased to 444 millimeters (about 17.5 inches). That is, it is growing at a rate of 2.3 millimeters (about 17.5 inches). 0.1 in) per year, which represents an increase of 10 percent overall.

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“Over the years, we’ve been looking for a way to measure gross changes in the global water cycle, and we’ve finally found it,” said Rieger. “The rise of evaporation really surprised us: it’s a big sign that shows that our planet’s water cycle is changing.”

The study, titled: “A 10% increase in global land evaporation from 2003 to 2019,” was published May 26 in Nature. In addition to JPL, NASA’s Goddard Space Flight Center in Greenbelt, Maryland contributed to this research.

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  • Wahid Bhat

    Wahid Bhat is an environmental journalist with a passion for covering climate change and environmental issues. He holds a degree in English Journalism (EJ) from the Indian Institute of Mass Communication and has received Media Fellow for NFI India (National Foundation for India) and Thomson Reuters Foundation. Wahid's reporting has been published in a range of respected outlets including Earth Journalism, Global Village Space, The Quint, Youth Ki Awaaz, and Devdiscourse

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