Soil Water Content (m3 m-3), October 2011 - May 2017

Author(s): Zareda M

Dataset Information

Site ID: XX-PTr

Site Name: Pantropical site

Variables: Soil water content (saturation)

Date Range: Oct. 1, 2011 - May 31, 2017

Description: The 2015–2016 El Niño event ranks as one of the most severe on record in terms of the magnitude and extent of sea surface temperature (SST) anomalies generated in the tropical Pacific Ocean. This data was used to investigate changes in soil moisture to better understand how it is impacted by climate anomalies during an El Niño event. This dataset contains soil water content hourly data processed to monthly from October 2011 to May 2017 in a single CSV file. Data was collected from Cosmic Neutron Probes at variable depth averaging 15 cm that was interpolated to near-surface (0-10 cm). Site is located at latitude 0.28 deg N, longitude 36.87 deg E. Data was downloaded from the The COsmic-ray Soil Moisture Observing System (COSMOS) soil moisture data network and is publicly available at Data from this site is referenced as Kenya in Table 1 and Figure 4 of Solander et al.: The pantropical response of soil moisture to El Niño, Hydrol. Earth Syst. Sci., 24, 2303–2322,, 2020.


Methods Description: The stationary cosmic-ray soil moisture probe measures the neutrons that are generated by cosmic rays within air and soil and other materials, moderated by mainly hydrogen atoms located primarily in soil water, and emitted to the atmosphere where they mix instantaneously at a scale of hundreds of meters and whose density is inversely correlated with soil moisture. For more information about COSMOS and data collection methods, please see the publication: Zreda, M., Shuttleworth, W. J., Zeng, X., Zweck, C., Desilets, D., Franz, T., and Rosolem, R.: COSMOS: the COsmic-ray Soil Moisture Observing System, Hydrol. Earth Syst. Sci., 16, 4079–4099,, 2012.

Access Level: Public

Originating Institution(s): University of Arizona

Sponsor Organization(s): National Science Foundation (grants EAR-01-26241 and EAR-06-36110), the ArmyResearch Office (grant 43857-EV), and the David and Lucile PackardFoundation (Fellowship for Science and Engineering 95-1832)

Contact: Solander, Kurt - Los Alamos National Laboratory (

Data Download

Version: 1.0

Dataset Citation: Zareda M (2020): Soil Water Content (m3 m-3), October 2011 - May 2017. 1.0. NGEE Tropics Data Collection. (dataset).

Acknowledgement: None

Data Link: Download Dataset

NGEE Tropics data policy.


Zreda, M., D. Desilets, T.P.A. Ferre and R.L. Scott, 2008, Measuring soil moisture content non-invasively at intermediate spatial scale using cosmic-ray neutrons. Geophysical Research Letters 35, L21402, doi:10.1029/2008GL035655.

Köhli, M., Schrön, M. , Zreda, M., Schmidt, U., Dietrich, P., and Zacharias, S., Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons, Water Resour. Res., 51, 5772-5790, 2017, doi: 10.1002/ 2015WR017169

Solander et al.: The pantropical response of soil moisture to El Niño, Hydrol. Earth Syst. Sci., 24, 2303–2322,, 2020.