scholarly journals Description of sediment data collected by the U.S. Geological Survey in small watersheds in coal-mining areas of the eastern United States, 1980-84

1986 ◽  
pp. 1-15
Author(s):  
L.D. Arihood
Keyword(s):  
United States ◽  
Coal Mining ◽  
Geological Survey ◽  
Eastern United States ◽  
Mining Areas ◽  
Small Watersheds ◽  
Sediment Data ◽  
The U.S

scholarly journals Diagnosis of Anomalous Winter Temperatures over the Eastern United States during the 2002/03 El Niño

2006 ◽  
Vol 19 (21) ◽  
pp. 5624-5636 ◽  
Author(s):  
Lisa Goddard ◽  
Arun Kumar ◽  
Martin P. Hoerling ◽  
Anthony G. Barnston
Keyword(s):  
United States ◽  
El Niño ◽  
El Nino ◽  
Winter Season ◽  
Temperature Pattern ◽  
Eastern United States ◽  
Seasonal Forecasts ◽  
Temperature Anomalies ◽  
Winter Temperatures ◽  
The U.S

Abstract The eastern United States experienced an unusually cold winter season during the 2002/03 El Niño event. The U.S. seasonal forecasts did not suggest an enhanced likelihood for below-normal temperatures over the eastern United States in that season. A postmortem analysis examining the observed temperatures and the associated forecast is motivated by two fundamental questions: what are these temperature anomalies attributable to, and to what extent were these temperature anomalies predictable? The results suggest that the extreme seasonal temperatures experienced in the eastern United States during December–February (DJF) 2002/03 can be attributed to a combination of several constructively interfering factors that include El Niño conditions in the tropical Pacific, a persistent positive Pacific–North American (PNA) mode, a persistent negative North Atlantic Oscillation (NAO) mode, and persistent snow cover over the northeastern United States. According to the simulations and predictions from several dynamical atmospheric models, which were not rigorously included in the U.S. forecast, much of the observed temperature pattern was potentially predictable.

scholarly journals Using Genomics to Link Populations of an Invasive Species to Its Potential Sources

2021 ◽  
Vol 9 ◽  
Author(s):  
Carlee A. Resh ◽  
Matthew P. Galaska ◽  
Kasey C. Benesh ◽  
Jonathan P. A. Gardner ◽  
Kai-Jian Wei ◽  
...  
Keyword(s):  
United States ◽  
River Basin ◽  
Yangtze River ◽  
Yangtze River Basin ◽  
Hudson River ◽  
The United States ◽  
Eastern United States ◽  
Native Range ◽  
The Yangtze River Basin ◽  
The U.S

The introduction and subsequent range expansion of the Northern snakehead (Channa argus: Channidae, Anabantiformes) is one of a growing number of problematic biological invasions in the United States. This harmful aquatic invasive species is a predatory freshwater fish native to northeastern Asia that, following deliberate introduction, has established itself in multiple water basins in the eastern United States, as well as expanding its range into the Midwest. Previous work assessed the population structure and estimated the long-term effective population sizes of the populations present in the United States, but the source of the initial introduction(s) to the U.S. remains unidentified. Building on earlier work, we used whole genome scans (2b-RAD genomic sequencing) to analyze single nucleotide polymorphisms (SNPs) from C. argus to screen the genomes of these invasive fish from United States waters and from three sites in their native range in China. We recovered 2,822 SNP loci from genomic DNA extracted from 164 fish sampled from the eastern United States and Arkansas (Mississippi River basin), plus 30 fish sampled from three regions of the Yangtze River basin in China (n = 10 individuals per basin). Our results provide evidence supporting the Yangtze River basin in China, specifically the Bohu and/or Liangzi lakes, is a likely source of the C. argus introductions in multiple regions of the U.S., including the Lower Hudson River basin, Upper Hudson River basin and Philadelphia (Lower Delaware River basin). This information, in conjunction with additional sampling from the native range, will help to determine the source(s) of introduction for the other U.S. populations. Additionally, this work will provide valuable information for management to help prevent and manage future introductions into United States waterways, as well as aid in the development of more targeted strategies to regulate established populations and inhibit further spread.

scholarly journals Spatial Distribution and Evolution of Extratropical Cyclone Errors over North America and its Adjacent Oceans in the NCEP Global Forecast System Model

2011 ◽  
Vol 26 (2) ◽  
pp. 129-149 ◽  
Author(s):  
Brian A. Colle ◽  
Michael E. Charles
Keyword(s):  
United States ◽  
North America ◽  
East Coast ◽  
Eastern Pacific ◽  
Central Pressure ◽  
Global Forecast System ◽  
Eastern United States ◽  
Forecast System ◽  
Western Atlantic ◽  
The U.S

Abstract Short- to medium-range (1–5 day) forecasts of extratropical cyclones around North America and its adjacent oceans are verified within the Global Forecast System (GFS) model at the National Centers for Environmental Prediction (NCEP) during the 2002–07 cool seasons (October–March). Cyclones in the immediate lee of the Rockies and U.S. Great Plains have 25%–50% smaller pressure errors than other regions after hour 36. The central pressure and displacement errors are largest over the central and eastern Pacific for the 42–72-h forecast, while the western and central Atlantic pressure errors for 96–120 h are similar to the central and eastern Pacific. For relatively strong cyclones, the western Atlantic and central/eastern Canada pressure errors are larger than those for the Pacific by 108–120 h. There are large spatial variations in the central pressure biases at 72–120 h, with overdeepened GFS cyclones (negative errors) extending from the northern Pacific and Bering Strait eastward to western Canada, while underdeepened GFS cyclones (positive errors) occur across northeast Canada and just east of the U.S. east coast. GFS cyclone tracks and spatial composites using the daily NCEP reanalysis are used to illustrate flow patterns and source regions for some of the large GFS cyclone errors and biases. Relatively large central pressure errors over the central Pacific early in the forecast (30 h) spread eastward over Canada by 66 h and the eastern United States by 84 h. The underdeepened GFS cyclone errors (>1.5 standard deviations) at day 4 over the western Atlantic are associated with an anomalous ridge over the western United States and trough over the eastern United States, and most of the underdeepening occurs with cyclones tracking east-northeastward across the Gulf Stream. Many of the overdeepened cyclones have tracks more parallel to the U.S. east coast. The underdeepened cyclones over the central and eastern Pacific tend to occur farther south (35°–45°N) than the overdeepened events.

Sign in / Sign up

Export Citation Format

Share Document