Publications
Publications
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Evaluation of a satellite-based cyanobacteria bloom detection algorithm using field-measured microcystin data Evaluation of a satellite-based cyanobacteria bloom detection algorithm using field-measured microcystin data
Widespread occurrence of cyanobacterial harmful algal blooms (CyanoHABs) and the associated health effects from potential cyanotoxin exposure has led to a need for systematic and frequent screening and monitoring of lakes that are used as recreational and drinking water sources. Remote sensing-based methods are often used for synoptic and frequent monitoring of CyanoHABs. In this study...
Authors
Sachidananda Mishra, Richard P. Stumpf, Blake Schaeffer, P. Jeremy Werdell, Keith A. Loftin, Andrew Meredith
Multiple co-occurring and persistently detected cyanotoxins and associated cyanobacteria in adjacent California lakes Multiple co-occurring and persistently detected cyanotoxins and associated cyanobacteria in adjacent California lakes
The global proliferation of toxin producing cyanobacterial blooms has been attributed to a wide variety of environmental factors with nutrient pollution, increased temperatures, and drought being three of the most significant. The current study is the first formal assessment of cyanotoxins in two impaired lakes, Canyon Lake and Lake Elsinore, in southern California that have a history of
Authors
Meredith D. A. Howard, Raphael M. Kudela, Kendra Hayashi, Avery O. Tatters, David A. Caron, Susanna Theroux, Stuart Oehrle, Miranda Roethler, Ariel Donovan, Keith A. Loftin, Zachary R. Laughrey
Streamflow—Water year 2019 Streamflow—Water year 2019
The maps and graphs in this summary describe national streamflow conditions for water year 2019 (October 1, 2018, to September 30, 2019) in the context of streamflow ranks relative to the 90-year period of water years 1930–2019. Annual runoff in the Nation’s rivers and streams during water year 2019 (13.62 inches) was much higher than the long-term (1930–2019) mean annual runoff of 9.37...
Authors
Xiaodong Jian, David M. Wolock, Harry F. Lins, Steven J. Brady
Interpretation of hydrogeologic data to support groundwater management, Bazile Groundwater Management Area, northeast Nebraska, 2019—A case demonstration of the Nebraska Geocloud Interpretation of hydrogeologic data to support groundwater management, Bazile Groundwater Management Area, northeast Nebraska, 2019—A case demonstration of the Nebraska Geocloud
Nitrate, age tracer, and continuous groundwater-level data were interpreted in conjunction with airborne electromagnetic (AEM) survey data to understand the movement of nitrate within the Bazile Groundwater Management Area (BGMA) in northeastern Nebraska. Previously published age tracer data and nitrate data indicated vertical stratification of groundwater quality. Younger groundwater...
Authors
Christopher M. Hobza, Gregory V. Steele
Exploring the potential value of satellite remote sensing to monitor chlorophyll-a for U.S. lakes and reservoirs Exploring the potential value of satellite remote sensing to monitor chlorophyll-a for U.S. lakes and reservoirs
Assessment of chlorophyll-a, an algal pigment, typically measured by field and laboratory in situ analyses, is used to estimate algal abundance and trophic status in lakes and reservoirs. In situ-based monitoring programs can be expensive, may not be spatially, and temporally comprehensive and results may not be available in the timeframe needed to make some management decisions, but can...
Authors
Michael Papenfus, Blake Schaeffer, Amina Pollard, Keith A. Loftin
Ecological forecasting—21st century science for 21st century management Ecological forecasting—21st century science for 21st century management
Natural resource managers are coping with rapid changes in both environmental conditions and ecosystems. Enabled by recent advances in data collection and assimilation, short-term ecological forecasting may be a powerful tool to help resource managers anticipate impending near-term changes in ecosystem conditions or dynamics. Managers may use the information in forecasts to minimize the...
Authors
John B. Bradford, Jake Weltzin, Molly L. McCormick, Jill Baron, Zack Bowen, Sky Bristol, Daren M. Carlisle, Theresa Crimmins, Paul C. Cross, Joe DeVivo, Mike Dietze, Mary Freeman, Jason Goldberg, Mevin Hooten, Leslie Hsu, Karen Jenni, Jennifer L. Keisman, Jonathan G. Kennen, Kathy Lee, David P. Lesmes, Keith A. Loftin, Brian W. Miller, Peter S. Murdoch, Jana Newman, Karen L. Prentice, Imtiaz Rangwala, Jordan Read, Jennifer Sieracki, Helen Sofaer, Steve Thur, Gordon Toevs, Francisco Werner, C. LeAnn White, Timothy White, Mark T. Wiltermuth
By
Ecosystems Mission Area, Water Resources Mission Area, Science Synthesis, Analysis, and Research Program, Contaminant Biology, Environmental Health Program, Science Analytics and Synthesis (SAS), Central Plains Water Science Center, Eastern Ecological Science Center, Fort Collins Science Center, Maryland-Delaware-D.C. Water Science Center, National Wildlife Health Center, New Jersey Water Science Center, Pacific Island Ecosystems Research Center, Southwest Biological Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center
Brianna postcard Brianna postcard
Brianna is a hydrologist in the Hydrologic Investigations (Studies) Unit. She received a bachelor of science degree in chemical engineering and a master’s degree in civil engineering from the University of Kansas.
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Brad postcard Brad postcard
Brad is a hydrologist in the Surface Water Investigation Unit. He received his bachelor of science degree in natural sciences from Concordia University in Wisconsin and his master’s degree in freshwater sciences from the University of Wisconsin-Milwaukee.
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Hydrologic technician postcard Hydrologic technician postcard
Hydrologic technicians collect water data related to water quantity, quality, availability, and movement in surface-water and groundwater environments. For more information, visit https://www.usajobs.gov.
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Chantelle postcard Chantelle postcard
Chantelle is a hydrologist in the Surface Water Investigation Unit. She received her bachelor of science degree in environmental geology from the University of Kansas.
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Hydrologist postcard Hydrologist postcard
Hydrologists study the properties, distribution, and effects of water on the Earth’s surface, in the soil and underlying rocks, and in the atmosphere. For more information, visit https://www.usajobs.gov.
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Chemist postcard Chemist postcard
Chemists design analytical methods, analyze samples, and review instrument results to ensure high-quality, defensible data are provided to our Nation’s decision makers. For more information, visit https://www.usajobs.gov.
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