A.J. Purdy

Postdoctoral Scholar | NASA Jet Propulsion Laboratory

Google Scholar

Hydrology - Water Resources - Ecosystems - Environment

California Adventuring



I look to better understand the global water cycle including its relation to human activity, the environment, and the earth system.

Check out the site and please reach out if you see an opportunity to collaborate or would like to talk about any previous or ongoing projects, publications , teaching, or adventures.

Hydrology - Water Resources - Ecohydrology

  • Hydrology - I use a satellite data-driven model to estimate ET globally. Recent work incorporates NASA's SMAP satellite to improve global estimates.
  • Water Resources - I am interested in how humans interact with the water cycle under a changing climate. Specifically, I look to quantify which fluxes human's impact the most or are most vulnerable to. I have collaborated on numerous projects to investigate water resource use from space in the Colorado River Basin, California, to Bangladesh. Additionally, I have worked on projects to develop better water use strategies through using satellite data to support on-farm irrigation.
  • Environment & Ecosystems - I use multiple satellite observations to track how the environment and ecosystems respond to perturbations and how these changes feed back on regional water cycle and the earth system.



Conference Presentations

  • Purdy, A.J., Fisher, J., Goulden, M.L., Randerson, J.S., Famiglietti, J.S., Water vs. Carbon: An evaluation of SMAP soil moisture, evapotranspiration, & OCO-2 solar induced fluorescence to characterize global plant stress. Poster Presentation AGU Fall 2017
  • Purdy, A.J., Fisher, J., Famiglietti, J.S., Potential for SMAP soil moisture observations to improve remote sensing of evapotranspiration algorithms. Oral Presentation AGU Fall 2016
  • Purdy, A.J., Fisher, J., Famiglietti, J.S., Ground Heat Flux: What’s the best approach. Oral Presentation AGU Fall 2015
  • Castle, S., Reager, J.T., Thomas, B.F.,Purdy, A.J., Lo, M. H., Rodell, M., Famiglietti, J.S., Assessing the impacts of water management on evapotranspiration in the Colorado River Basin. H34D-06 AGU Fall 2014
  • Purdy, A.J., Famiglietti, J.S. Remote sensing and modeling evapotranspiration: A high-resolution multi-method comparison at point and basin scales in California. Oral Presentation AGU Fall 2013
  • Melton, F.S. Lund, C., Johnson, L., Michaelis, A., Pierce, L., Guzman, A., Hiat, S., Purdy, A.J., Rosevelt, C., Brandt, W., Votava, P., Nemani, R., Satellite Mapping of Agricultural Water Requirements in California with the Terrestrial Observation and Prediction System. H21H-1272 AGU Fall 2012
  • Purdy, A.J., Lund, C.P., Pierce, L., Melton, F.S., Guzman, A., Harlen, I., Holloway, R., Johnson, L., Lee, C., Nemani, R.. Applications of wireless sensor networks, soil water balance modeling, and satellite data for crop evapotranspiration monitoring and irrigation management support. H21F-120: Poster AGU Fall 2011
  • Melton, F., Johnson, L., Lund, C., Michaelis, A., Pierce, L., Guzman, A., Hiat, S., Purdy, A.J., Lee, C., Rosevelt, C., Fletcher, N., Votava, P., Milesi, C., Hashimoto, H., Wang, W., Scheffner, E.J., Nemani, R., Satellite Monitoring and Management Support in California with the Terrestrial Observation and Prediction System H21F-1227 AGU Fall 2011

White Papers

Teaching Experience

I have been fortunate to be involved in teaching at many levels throuhgout my academic career. Below I detail the university level courses I have been involved with. In addition to the courses I have received formal tutoring training from the Cal State System and taken a course in curiculum development and engaged learning from the University of California.


Remote Sensing and Hydrology

CUAHSI 2016/2017

I helped plan a three day workshop at BIOSPHERE 2 in Tuscon, AZ and CUAHSI headquarters in Boston, MA to review current and future NASA earth observing satellites that focus on the hydrologic cycle. We provided in depth presentations on the history and application of GRACE, SMAP, and the upcoming SWOT missions. The workshops included advising group projects focused on one of the NASA satellites.


Terrestrial Hydrology

UCI 2016

An introduction to the terrestrial water cycle. I helped formulate new course exercises and gave guest lectures. I was able to update assignments to incorporate real observations of precipitation, snowpack, streamflow, reservoir storage, and groundwater from across California to use within assignments focused on hydrologic theory.


Data Analysis for Earth Sciences

UCI 2015

Analysis and interpretation of geophysical data, including functional fitting, probability density functions, and multidimensional time-series methods, with applications in atmospheric, oceanic, and biogeochemical sciences.


Fundamental Processes in Earth and Environmental Studies

UCI 2014

An introduction to the physical environment, biological systems, and human-environment interactions. Explores physical principles such as fluid transport and reaction rates using environmental examples as well as principles of populations, ecosystems, carrying capacity, and sustainable use of resources.


Local and Regional Environmental Issues

UCI 2014

An introduction to common environmental issues using case studies from Orange County and California. Studies natural hazards as well as human-caused problems with air quality, water quality, coastal pollution, ecosystem degradation, and urban climate.


On Thin Ice

UCI 2014

Climate Change and the Cryosphere: Introduction of the basic science that governs the cryosphere and its interaction with the climate system. Covers some of the significant economic, sociological, and political consequences of the recent melting of the cryosphere driven by anthropogenic climate change.


Physics I

CSUMB 2011

Physics 1 explores Newtonian mechanics (including rotational motion), work, energy, power, mechanical waves and sound, and circuits – in other words, fundamental physics concepts.


Physics II

CSUMB 2011

Physics 2 explores fluid statics and dynamics, thermodynamics with kinetic theory, PV diagrams and probability, electrostatics, electrical circuits with capacitors, magnetic fields, electromagnetism, physical and geometric optics, and quantum, atomic, and nuclear physics. Lab Instructor

About Me

Welcome to my site. I am currently a postdoctoral scholar in the Carbon and Ecosystems Group at the NASA Jet Propulsion Laboratory.


My contact information is listed at the top my CV. Contact me if you see an oportunity to colaborate or to chat science, education, or adventures.