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Satellites Observe Amazon Basin Water Storage And Runoff

Date:
May 31, 2009
Source:
American Geophysical Union
Summary:
Scientists would like to better understand the physical processes in Amazon hydrological systems. To explore the water storage and dynamics in the Amazon basin, researchers have used data from the two Gravity Recovery and Climate Experiment (GRACE) satellites, which measure mass distribution on Earth's surface through instantaneous measurements of the changes in the distance between the satellites.
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Scientists would like to better understand the physical processes in Amazon hydrological systems.

To explore the water storage and dynamics in the Amazon basin, a team of researchers used four years of data from the two Gravity Recovery and Climate Experiment (GRACE) satellites, which measure mass distribution on Earth's surface through instantaneous measurements of the changes in the distance between the satellites. Water stored in the Amazon basin affects mass distribution and thus can be monitored by the GRACE satellites.

Reporting in a recent issue of Geophysical Research Letters, the authors (Han et al.) found that soil water explains about half of the observed changes in intersatellite distance; surface and subsurface runoff explains the rest. By comparing river runoff routing simulations with GRACE data for the Amazon region, the authors found that the overall effective runoff velocity for the entire Amazon basin was about 30 centimeters per second (about one foot per second), with significant seasonal variation.

They conclude that incorporating GRACE data can help improve routing schemes in large-scale land surface models.

The team included scientists from NASA's Goddard Space Flight Center, the University of Maryland, the University of Tokyo, the Korea Polar Research Institute, and Ohio State University.


Story Source:

The above post is reprinted from materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. Han, S.-C., H. Kim, I.-Y. Yeo, P. Yeh, T. Oki, K.-W. Seo, D. Alsdorf, and S. B. Luthcke. Dynamics of surface water storage in the Amazon inferred from measurements of inter-satellite distance change. Geophysical Research Letters, 2009; 36 (9): L09403 DOI: 10.1029/2009GL037910

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American Geophysical Union. "Satellites Observe Amazon Basin Water Storage And Runoff." ScienceDaily. ScienceDaily, 31 May 2009. <www.sciencedaily.com/releases/2009/05/090529135720.htm>.
American Geophysical Union. (2009, May 31). Satellites Observe Amazon Basin Water Storage And Runoff. ScienceDaily. Retrieved August 28, 2015 from www.sciencedaily.com/releases/2009/05/090529135720.htm
American Geophysical Union. "Satellites Observe Amazon Basin Water Storage And Runoff." ScienceDaily. www.sciencedaily.com/releases/2009/05/090529135720.htm (accessed August 28, 2015).

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