Study tracks 'memory' of soil moisture

January 16, 2017, Massachusetts Institute of Technology
A composite image of the Western hemisphere of the Earth. Credit: NASA

The top 2 inches of topsoil on all of Earth's landmasses contains an infinitesimal fraction of the planet's water—less than one-thousandth of a percent. Yet because of its position at the interface between the land and the atmosphere, that tiny amount plays a crucial role in everything from agriculture to weather and climate, and even the spread of disease.

The behavior and dynamics of this reservoir of moisture have been very hard to quantify and analyze, however, because measurements have been slow and laborious to make.

That situation changed with the launch in 2015 of a NASA satellite called SMAP (Soil Moisture Active Passive), designed to provide globally comprehensive and frequent measurements of the moisture in that top layer of . SMAP's first year of observational data has now been analyzed and is providing some significant surprises that will help in the modeling of climate, forecasting of weather, and monitoring of agriculture around the world.

These new results are reported in the journal Nature Geoscience, in a paper by SMAP Science Team leader Dara Entekhabi, recent MIT graduate Kaighin McColl PhD '16, and four others. Entekhabi is a professor in the Ralph M. Parsons Laboratory for Environmental Science and Engineering in MIT's Department of Civil and Environmental Engineering.

The SMAP observations are providing an unprecedented level of detailed, worldwide information on the amount of water in those top 2 inches (5 centimeters) of soil, collected globally every two to three days. Entekhabi says this is important because this thin layer is a key part of the global water cycle over the continents, and also a key factor in the global energy and carbon cycles.

Precipitation on land, and the evaporation of that moisture from the land, "transfers large amounts of energy" between the continents and the atmosphere, Entekhabi says, and the Earth's climate would be drastically different without this element. The oceans, containing 97 percent of Earth's water, provide a major role in storing and releasing heat, but over land that role is provided by the moisture in the topmost layer of the soil, albeit through different mechanisms. That moisture "is a tiny, tiny fraction of the water budget, but it's sitting at a very critical zone at the surface of the land, and plays a disproportionately critical role in the cycling of water," he says. "It plays a significant role in moderating climate, on seasonal and annual timescales."

Understanding these cycles better, thanks to the , could help make weather predictions more accurate over longer timescales, which could be an important boon for agriculture. Several federal agencies have already begun using the SMAP data, Entekhabi says, for example, to help make forecasting of drought and flood conditions more accurate.

"The satellite is providing an extraordinary quality of surface soil moisture information that makes this analysis possible," he says. The satellite's primary mission of three years is about halfway over, he says, but the team is working on applying for an extended mission that could last as much as a decade.

One of the big surprises from the new data is that this top level of soil preserves a "memory" for weather anomalies, more so than had been predicted from theory and earlier, sparser measurements. Memory refers to the persistence of effects from unusually high or low amounts of rainfall. Contrary to most researchers' expectations, it turns out that these effects persist for a matter of days, rather than just a few hours. On average, about one-seventh of the amount of rain that falls is still present in that topmost layer of soil three days after it falls—and this persistence is greatest in the driest regions.

The data also show a significant feedback effect that can amplify the effects of both droughts and floods, Entekhabi says. When moisture evaporates from wet soil, it cools the soil in the process, but when the soil gets too dry that cooling diminishes, which can lead to hotter weather and heat waves that extend and deepen drought conditions. Such effects "had been speculated," he says, "but hadn't been observed directly."

The ongoing SMAP mission also provides educational opportunities that help to verify and calibrate the satellite data. With minimal equipment, students can participate in hands-on lessons in data collection, using measurement methods that are considered the gold standard. For example, they can gather a sample of soil in a fixed volume such as a tuna can, and weigh it before and after drying it out. The difference between the two weights gives a precise measure of the soil's moisture content in that volume, which can be compared with the satellite's measurement.

Even young students "can carry out 'gold standard' measurements, and all it takes is a kitchen scale and an oven," Entekhabi says. "But it's very labor-intensive. So we have engaged with schools around the world to do these measurements."

Explore further: SMAP will track a tiny cog that keeps cycles spinning

More information: The global distribution and dynamics of surface soil moisture, Nature Geoscience, nature.com/articles/doi:10.1038/ngeo2868

Related Stories

SMAP will track a tiny cog that keeps cycles spinning

January 27, 2015

When you open the back of a fine watch, you see layer upon layer of spinning wheels linked by interlocking cogs, screws and wires. Some of the cogs are so tiny they're barely visible. Size doesn't matter—what's important ...

Helping satellites be right as rain

June 8, 2016

As you read this paragraph, a NASA satellite orbits around planet Earth, gathering data on—of all things—soil moisture. Moisture in the soil acts like a thermostat for the planet. Along with affecting agricultural production, ...

SMAP team investigating radar instrument anomaly

July 13, 2015

Mission managers at NASA's Jet Propulsion Laboratory, Pasadena, California, are assessing an anomaly with the radar instrument on NASA's Soil Moisture Active Passive (SMAP) satellite observatory. The radar is one of two science ...

Recommended for you

Sahara dust may make you cough, but it's a storm killer

July 20, 2018

The bad news: Dust from the Sahara Desert in Africa—totaling a staggering 2 to 9 trillion pounds worldwide—has been almost a biblical plague on Texas and much of the Southern United States in recent weeks. The good news: ...

Human influence detected in changing seasons

July 20, 2018

For the first time, scientists from Lawrence Livermore National Laboratory (LLNL) and five other organizations have shown that human influences significantly impact the size of the seasonal cycle of temperature in the lowest ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.