Navajo Nation Climate II

Navajo Nation Climate II

A Drought Monitoring Decision Support Tool for Customized Calculation of a Standardized Precipitation Index Value in the Navajo Nation

The Navajo Nation, a 65,700 km2 Native American territory located in the southwestern United States, has been increasingly impacted by severe drought events and changes in climate. These events are coupled with a lack of domestic water infrastructure and economic resources, leaving approximately one-third of the population without access to potable water in their homes. Current methods of monitoring drought are dependent on state-based monthly Standardized Precipitation Index value maps calculated by the Western Regional Climate Center. However, these maps do not provide the spatial resolution needed to illustrate differences in drought severity across the vast Nation. To better understand and monitor drought events and drought regime changes in the Navajo Nation, this project created a geodatabase of historical climate information specific to the area, and a decision support tool to calculate average Standardized Precipitation Index values for user-specified areas.

The tool and geodatabase use Tropical Rainfall Monitoring Mission (TRMM) and Global Precipitation Monitor (GPM) observed precipitation data and Parameter-elevation Relationships on Independent Slopes Model modeled historical precipitation data, as well as NASA’s modeled Land Data Assimilation Systems deep soil moisture, evaporation, and transpiration data products. The geodatabase and decision support tool will allow resource managers in the Navajo Nation to utilize current and future NASA Earth observation data for increased decision-making capacity regarding future climate change impact on water resources.

NASA Ames Research Center
Summer 2015
Navajo Nation Department of Water Resources (NNDWR), Water Management Branch, End-User, POC: Maurice Upshaw, Robert Kirk, Jason John, and Teresa Showa
Navajo Technical University, Geographic Information Science Lab, End-user, POC: Ramsey Seweingyawwa
NASA Earth Observations
TRMM, Precipitation Radar (PR)
Cheryl Cary (Project Lead)
Michael Gao
Vickie Ly
Anton Surunis
Sophie Turnbull-Appell
Dr. J. W. Skiles (NASA Ames Research Center)
Dr. Venkat Lakshmi (University of South Carolina)
Amber Brooks (DEVELOP National Program, Ames Research Center)

Project Video

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