James S. (Jay) Famiglietti is the former director of the Global Institute for Water Security at the University of Saskatchewan in Saskatoon, Canada. Prior to that he was the Senior Water Scientist at NASA Jet Propulsion Laboratory in Pasadena, CA [1] and a professor of Earth System Science at the University of California, Irvine. He is a leading expert in global water issues and in raising awareness about the global water crisis and in particular, about global groundwater depletion. [2]
Famiglietti received his B.S. in Geology from Tufts University in 1982 and his M.S. in Hydrology from the University of Arizona in 1986. [3] He continued his graduate studies at Princeton University, where he earned both his M.A. and Ph.D. in Civil Engineering. [4] Formerly an Assistant and Associate Professor in the Department of Geological Sciences at the University of Texas at Austin, and the founding Associate Director of the University of Texas at Austin's Environmental Science Institute, Famiglietti was also the founding director of the UC Center for Hydrologic Modeling (UCCHM) at UC Irvine. [5]
Famiglietti is known for his research using satellites and developing computer models to track changing freshwater availability around the globe. His work, his commentary and efforts in science communication were featured in the Participant Media water documentary Last Call at the Oasis, [6] in 60 Minutes, [7] on Real Time with Bill Maher . [8]
Famiglietti's research centers around “the role of hydrology in the coupled Earth system” and evaluating “global change impacts on water availability.” [9] He has long been a proponent of advancing the capabilities of hydrological models in the United States. While chair of the board of the Consortium of Universities for the Advancement of Hydrologic Science (CUAHSI), he led the Community Hydrologic Modeling Platform (CHyMP) effort to accelerate the development of hydrological models for use in addressing global issues related to water, food, economic, climate, and global security. He continued those efforts at the UCCHM and at NASA JPL, where he leads the Western States Water Mission. [10]
Famiglietti conducts research using NASA’s Gravity Recovery and Climate Experiment (GRACE) to monitor how humans and global change are impacting freshwater availability. His team pioneered the use of GRACE for remote sensing of groundwater storage changes. [11] Their work has revealed unsustainable groundwater use and the rapid rates of groundwater depletion [2] [12] [13] [14] [15] in the world's major aquifers. [16] [17] This research is also recognized by NASA as the primary justification for the selection of the GRACE Follow-On (GRACE-FO) as a climate continuation mission. [18]
Famiglietti is a Fellow of the American Geophysical Union (AGU) [19] and of the Geological Society of America (GSA). [20] In 2012 he was selected as the GSA's Birdsall-Dreiss Distinguished Lecturer. [21] During that year he delivered over 50 lectures in the United States and internationally on the topics of water cycle change and on the need to advance hydrological modelling capabilities. [22] He was also selected as one of two 2014 David Keith Todd Lecturers of the Groundwater Resources Association of California. [23] In 2010, Famiglietti was the recipient of the Shimizu Visiting Professorship at Stanford University in Civil and Environmental Engineering. Other notable honors include being awarded the Outstanding Contributions to Undergraduate Education honor in 2005 by UC Irvine, and the NASA New Investigator Award in 1996. [9]
Famiglietti has published a number of academic research reports and articles, on topics ranging from soil moisture, to the remote sensing of groundwater availability and the effects of climate change on water balance. Notable publications include Satellite-Based Estimates of Groundwater Depletion in India, [12] Satellites Measure Recent Rates of Groundwater Depletion in California’s Central Valley (2011), [13] The Global Groundwater Crisis (2014), [24] Quantifying Renewable Groundwater Stress with GRACE [17] and Emerging trends in global freshwater availability [25]
Beyond academia, Famiglietti has published a number of op-eds in major national newspapers including the Los Angeles Times, [26] [27] [28] and the San Francisco Chronicle. [29] Among these, his March 12, 2015 LA Times op-ed went viral and attracted major media and public attention [30] [31] [32] [33] He has also been a regular contributor to the National Geographic Water Currents blog [34] and to Huffington Post. [35]
The water cycle, is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time. However, the partitioning of the water into the major reservoirs of ice, fresh water, salt water and atmospheric water is variable and depends on climatic variables. The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere. The processes that drive these movements are evaporation, transpiration, condensation, precipitation, sublimation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapor. The ocean plays a key role in the water cycle as it is the source of 86% of global evaporation.
Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the water table. Groundwater is recharged from the surface; it may discharge from the surface naturally at springs and seeps, and can form oases or wetlands. Groundwater is also often withdrawn for agricultural, municipal, and industrial use by constructing and operating extraction wells. The study of the distribution and movement of groundwater is hydrogeology, also called groundwater hydrology.
The Gravity Recovery and Climate Experiment (GRACE) was a joint mission of NASA and the German Aerospace Center (DLR). Twin satellites took detailed measurements of Earth's gravity field anomalies from its launch in March 2002 to the end of its science mission in October 2017. The two satellites were sometimes called Tom and Jerry, a nod to the famous cartoon. The GRACE Follow-On (GRACE-FO) is a continuation of the mission on near-identical hardware, launched in May 2018. On March 19, 2024, NASA announced that the successor to GRACE-FO would be Gravity Recovery and Climate Experiment-Continuity (GRACE-C), to be launched in or after 2028.
Rafael Luis Bras is a Puerto Rican civil engineer best known for his contributions in surface hydrology and hydrometeorology, including his work in soil-vegetation-atmosphere system modeling.
Groundwater recharge or deep drainage or deep percolation is a hydrologic process, where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table surface. Groundwater recharge also encompasses water moving away from the water table farther into the saturated zone. Recharge occurs both naturally and through anthropogenic processes, where rainwater and/or reclaimed water is routed to the subsurface.
Overdrafting is the process of extracting groundwater beyond the equilibrium yield of an aquifer. Groundwater is one of the largest sources of fresh water and is found underground. The primary cause of groundwater depletion is the excessive pumping of groundwater up from underground aquifers. Insufficient recharge can lead to depletion, reducing the usefulness of the aquifer for humans. Depletion can also have impacts on the environment around the aquifer, such as soil compression and land subsidence, local climatic change, soil chemistry changes, and other deterioration of the local environment.
Soil Moisture Active Passive (SMAP) is a NASA environmental monitoring satellite that measures soil moisture across the planet. It is designed to collect a global 'snapshot' of soil moisture every 2 to 3 days. With this frequency, changes from specific storms can be measured while also assessing impacts across seasons of the year. SMAP was launched on 31 January 2015. It was one of the first Earth observation satellites developed by NASA in response to the National Research Council's Decadal Survey.
The University of California Center for Hydrologic Modeling (UCCHM) is a campus-wide hydrologic modeling research center, located at the University of California, Irvine. The models and modeling frameworks developed at the center address the urgent environmental and health issues related to water availability, such as how water availability will change in response to external factors like global climate change, how water availability will change with diminishing snow and ice, and how the frequency of hydrologic extremes will affect the state of California. The UCCHM team, made up of faculty, researchers and students, is working towards creating a state-of-the-art integrated model of California water resources that can influence and inform leaders of local, state and regional governments when making water management decisions.
The global freshwater model WaterGAP calculates flows and storages of water on all continents of the globe, taking into account the human influence on the natural freshwater system by water abstractions and dams. It supports understanding the freshwater situation across the world's river basins during the 20th and the 21st centuries, and is applied to assess water scarcity, droughts and floods and to quantify the impact of human actions on e.g. groundwater, wetlands, streamflow and sea-level rise. Modelling results of WaterGAP have contributed to international assessment of the global environmental situation including the UN World Water Development Reports, the Millennium Ecosystem Assessment, the UN Global Environmental Outlooks as well as to reports of the Intergovernmental Panel on Climate Change. WaterGAP contributes to the Intersectoral Impact Model Intercomparison Project ISIMIP, where consistent ensembles of model runs by a number of global hydrological models are generated to assess the impact of climate change and other anthropogenic stressors on freshwater resources world-wide.
Soroosh Sorooshian is an Iranian-born American civil engineer, and educator. He is a distinguished professor of civil and environmental engineering at the University of California, Irvine and currently serving as the Director of the Center for Hydrometeorology and Remote Sensing.
In summer 1965, the first close-up images from Mars showed a cratered desert with no signs of water. However, over the decades, as more parts of the planet were imaged with better cameras on more sophisticated satellites, Mars showed evidence of past river valleys, lakes and present ice in glaciers and in the ground. It was discovered that the climate of Mars displays huge changes over geologic time because its axis is not stabilized by a large moon, as Earth's is. Also, some researchers maintain that surface liquid water could have existed for periods of time due to geothermal effects, chemical composition, or asteroid impacts. This article describes some of the places that could have held large lakes.
The Arabian Aquifer System is primarily located in Saudi Arabia but also in Jordan, Syria, Iraq, Kuwait, Bahrain, Qatar, United Arab Emirates, Oman, and Yemen.
Amy Townsend-Small is the director of the Environmental Studies Program as well as an associate professor in the Department of Geology and Geography at the University of Cincinnati.
Petra Döll is a German hydrologist whose research focuses on global water resources and methods for transdisciplinary knowledge integration. She is a professor of hydrology at the Institute of Physical Geography, Goethe University Frankfurt.
Bridget R. Scanlon is an Irish and American hydrogeologist known for her work on groundwater depletion and groundwater recharging, and of the effects of climate change and land usage patterns on groundwater. She is a senior research scientist in the Bureau of Economic Geology at the University of Texas at Austin, where she is head of the Sustainable Water Resources Program. Her research has included the use of GRACE satellite data to compare drought conditions in Texas and California.
Amir AghaKouchak is an Iranian American civil engineer, academic and researcher. He is a Professor of Civil Engineering, Environmental Engineering, and Earth System Science at University of California, Irvine.
Moustafa T. Chahine was an atmospheric scientist and an international leader in atmospheric remote sensing using satellite observations. He was the Science Team Leader for the Atmospheric Infrared Sounder on NASA's Earth Observing System Aqua satellite, and the Chairman of the Global Energy and Water Exchanges (GEWEX) Science Steering Group of the World Climate Research Program (WCRP).
The effects of climate change on the water cycle are profound and have been described as an intensification or a strengthening of the water cycle. This effect has been observed since at least 1980. One example is when heavy rain events become even stronger. The effects of climate change on the water cycle have important negative effects on the availability of freshwater resources, as well as other water reservoirs such as oceans, ice sheets, the atmosphere and soil moisture. The water cycle is essential to life on Earth and plays a large role in the global climate system and ocean circulation. The warming of our planet is expected to be accompanied by changes in the water cycle for various reasons. For example, a warmer atmosphere can contain more water vapor which has effects on evaporation and rainfall.
Isabella Velicogna is a geoscientist known for her work using gravity measurements from space to study changes in the polar ice sheets and water storage on Earth.
The Indus basin is the part of Asia drained by the Indus River and its tributaries. The basin covers an area of 1,120,000 km2 (430,000 sq mi) traversing four countries: Afghanistan, China, India and Pakistan, with most of the area lying predominantly in the latter two countries.