One of the primary goals of the US Geological Survey (USGS) Laboratory in Lawrence, Kansas, is to develop analytical methods for the analysis of herbicide metabolites in surface and ground water that are vital to the study of herbicide fate and degradation pathways in the environment. Methods to measure metabolite concentrations from three major classes of herbicides--triazine, chloroacetanilid...

[1] Estimators of low-streamflow statistics are often required for water quality and quantity management at gauged and ungauged sites. Here the technique of baseflow correlation is investigated as an estimator of the 7-day, 10-year low-streamflow statistic at ungauged sites. This method uses an information transfer technique to estimate streamflow statistics at an ungauged site by correlating a...

In this short communication, we describe the shortcomings and pitfalls of a commonly used method to detect ground materials that relies on setting thresholds for normalized difference indices. We analyze critically present some experimental results USGS ECOSTRESS spectral libraries real Sentinel-2 Landsat-8 images. demonstrate risk commission errors provide suggestions reduce it.

First posted August 11, 2023 For additional information, contact: Western Ecological Research CenterU.S. Geological Survey3020 State University Drive EastSacramento, California 95819 A goal of U.S. Survey (USGS) research is to create actionable science for Department the Interior managers and partners. Properly managed released software tools can quickly, accurately, easily translate scientific...

First posted January 29, 2021 For additional information, contact: Earth System Processes DivisionWater Mission AreaU.S. Geological Survey12201 Sunrise Valley DriveReston, VA 20192Contact Pubs Warehouse This report and associated dataset provide tabular county-level estimates of kilograms nitrogen phosphorus generated from two sources: (a) fertilizer commercial sources (b) livestock-based manur...

First posted January 19, 2021 For additional information, contact: Send email to [email protected]. Geological Survey12201 Sunrise Valley DriveReston, VA 20192 Today’s Earth system challenges are far more complex and urgent than those that existed in 1879 when the USGS was established. Society’s greatest directly or indirectly linked major areas of science. Increased pressures on natural resource...

Deriving GIS data from historical maps will provide the ability to compare historical geographic patterns to more recent GIS-layers. In this example, USGS topographic maps, scanned at Western Michigan University's W.E.Upjohn Center for Global Change provide experimental sources for the feature extraction techniques. USGS topographic maps contain standardized symbols and uniform colors, and the ...

We recently reported the first multiple oxygen isotope composition of nitrate (NO3 ̄) in ice cores. Post-depositional photolysis and volatilization may alter the isotopic signatures of snowpack nitrate. Therefore, the precise assessment of the geochemical/atmospheric significance of O-isotopic signatures requires information on the relative rates of photolysis (λ > 300 nm) of NO3, NO2O ̄ and NO2O...

First posted August 15, 2023 For additional information, contact: Associate Director, Natural HazardsU.S. Geological Survey12201 Sunrise Valley Dr., Mail Stop 905Reston, VA 20192Contact Pubs Warehouse Every year in the United States, natural hazards threaten lives and livelihoods, resulting thousands of casualties billions dollars damage. The U.S. Survey (USGS) Hazards Mission Area works with m...

The Universal Soil Loss Equation (USLE) and its derivatives are widely used for identifying watersheds with a high potential for degrading stream water quality. We compared sediment yields estimated from regional application of the USLE, the automated revised RUSLE2, and five sediment delivery ratio algorithms to measured annual average sediment delivery in 78 catchments of the Chesapeake Bay w...