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Soil Moisture US October 2021 Anotated
Science & Technology

“Extreme” Drought Affecting Agricultural Lands in the Northern Great Plains

October 1 – 12, 2021

Heat and dry situations proceed to have an effect on agricultural lands in the U.S. Northern Plains and the Canadian Prairies.

A long time of drought across the U.S. Southwest has led some scientists to categorise the intense, extended dryness as a “megadrought.” However drought in North America took a special form in 2021, affecting areas that don’t face long-term or intense drought as typically. The northern Great Plains has been dealing with drought for months.

In keeping with the U.S. and Canadian drought screens, “excessive” drought first took maintain in North Dakota and Manitoba in mid-March 2021. By summer time, excessive and “distinctive” drought (the worst classification) had unfold to components of Montana, Minnesota, Alberta, and Saskatchewan. Current autumn rainfall has lessened the affect in some areas, however for the most half soils stay parched.

Drought in the northern Great Plains can have an effect on the manufacturing of crops, in addition to forage for livestock. When assessing drought and its potential to have an effect on agriculture, scientists take a look at a wide range of indicators equivalent to precipitation, temperature, evapotranspiration, and the way a lot moisture is held in the soil.

“Earth statement information can inform us quite a bit about environmental situations that affect agricultural manufacturing pretty early in the rising season, and naturally all through,” mentioned Mary Mitkish, assistant supervisor for NASA Harvest, an utilized sciences program advancing the use of Earth observations for agriculture and meals safety. “By combining satellite tv for pc information with climate and different datasets, we will completely monitor crop situations and anticipate anticipated impacts on manufacturing.”

A type of indicators—soil moisture—is proven in the map above. Particularly, the map reveals soil moisture anomalies; that’s, how the water content material in the high meter (3 ft) of soil from October 1-12, 2021, in comparison with regular situations for the time of 12 months. This layer of soil, known as the “root zone,” is the most related layer for agriculture. Too little water right here can stop seed germination or stunt plant progress.

The measurements had been derived from information collected by the Soil Moisture Energetic Passive (SMAP) mission, the first NASA satellite tv for pc devoted to measuring the water content material of soils. SMAP’s radiometer can detect water in the high 5 centimeters (2 inches) of the floor. Scientists use that floor layer information in a hydrologic mannequin to estimate how a lot water is current in the root zone.

The second map beneath reveals shallow groundwater storage, as measured by the Gravity Restoration and Local weather Experiment Comply with On (GRACE-FO) satellites on October 11, 2021. In comparison with water in the root zone, which may react comparatively shortly to rainfall occasions, groundwater is a deeper useful resource and replenishes slowly. This deeper supply of water is used for crop irrigation, consuming water, and may maintain streams throughout dry spells.

October 11, 2021

The Canadian Drought Monitor reported that by the finish of September, 67 p.c of Alberta was in reasonable to extreme drought, together with 97 p.c of the province’s agricultural land. Sixty-four p.c of Saskatchewan and 43 p.c of Manitoba had been in reasonable to distinctive drought, encompassing one hundred pc of the agricultural land in each provinces. Excessive temperatures and a scarcity of rain all through the summer time led to low yields of crops, particularly wheat. Diminished feed for livestock has led some ranchers in the Canadian Prairies to cull their herds.

In the United States, drought all through the summer time additionally hit exhausting in areas rising spring wheat, which is harvested from late summer time to early fall. USDA crop reports point out that in mid-August—round the most crucial time for spring wheat—crop situations had been largely honest to very poor in the Dakotas, Montana, and Minnesota.

Soils in components of Iowa and Wisconsin additionally seemed to be unusually dry. Nonetheless, in early autumn, the condition of corn crops was largely good to honest.

It stays to be seen how the ongoing drought will have an effect on yields of winter wheat, which is planted in autumn and harvested in spring. Coming into autumn, virtually half of the winter wheat crops grown in the U.S. had been nonetheless dealing with drought.

NASA Earth Observatory pictures by Lauren Dauphin, utilizing soil moisture information courtesy of JPL and the SMAP Science Workforce and GRACE information from the Nationwide Drought Mitigation Heart. Story by Kathryn Hansen with data supplied by Mary Mitkish, Keelin Haynes, and Estefania Puricelli/NASA Harvest. NASA Harvest is an utilized sciences program with the mission of enabling and advancing the adoption of satellite tv for pc Earth observations by private and non-private organizations to profit meals safety, agriculture, and human and environmental resiliency in the U.S. and worldwide. This consortium of scientists and agricultural stakeholders is led by the College of Maryland.

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