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185099 results.

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Page 1916, results 47876 - 47900

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Modeling the effects of wave climate and sediment supply variability on large-scale shoreline change
Peter Ruggiero, Maarten C. Buijsman, George M. Kaminsky, Guy R. Gelfenbaum
2010, Marine Geology (273) 127-140
The application of an integrated data analysis and modeling scheme reveals that decadal-scale shoreline evolution along a U.S. Pacific Northwest littoral cell is highly dependent on both sediment supply and wave climate variability. In particular, accurate estimates of (Columbia River) sediment supply and sediment feeding from the lower shoreface are...
Utility of mesohabitat features for determining habitat associations of subadult sharks in Georgia’s estuaries
C.N. Belcher, Cecil A. Jennings
2010, Environmental Biology of Fishes (88) 349-359
We examined the affects of selected water quality variables on the presence of subadult sharks in six of nine Georgia estuaries. During 231 longline sets, we captured 415 individuals representing nine species. Atlantic sharpnose shark (Rhizoprionodon terranovae), bonnethead (Sphyrna tiburo), blacktip shark (Carcharhinus limbatus) and sandbar shark (C. plumbeus) comprised...
Historical evolution of the Columbia River littoral cell
George M Kaminsky, Ruggiero Peter, Maarten C. Buijsman, Diana McCandless, Guy R. Gelfenbaum
2010, Marine Geology (273) 96-126
This paper details the historical coastal evolution of the Columbia River littoral cell in the Pacific Northwest of the United States. Geological data from A.D. 1700 and records leading up to the late 1800s provide insights to the natural system dynamics prior to significant human intervention, most notably jetty construction...
Crater population and resurfacing of the Martian north polar layered deposits
Maria E. Banks, Shane Byrne, Kapil Galla, Alfred S. McEwen, Veronica J. Bray, Colin M. Dundas, Kathryn E. Fishbaugh, Kenneth E. Herkenhoff, Bruce C. Murray
2010, Journal of Geophysical Research E: Planets (115)
Present‐day accumulation in the north polar layered deposits (NPLD) is thought to occur via deposition on the north polar residual cap. Understanding current mass balance in relation to current climate would provide insight into the climatic record of the NPLD. To constrain processes and rates of NPLD resurfacing, a search...
2009 Data Summary USA-NPN Technical Series
Theresa Crimmins, Alyssa H. Rosemartin, Kathryn A. Thomas, R. Lee Marsh, Ellen G. Denny, Jake F. Weltzin
2010, USA-NPN Technical Series 2010-002
The USA National Phenology Network (USA-NPN) engages volunteer observers to collect phenology observations of plants and animals using consistent standards and to contribute to the USA-NPN National Phenology Database. In March 2009, the USA-NPN National Coordinating Office implemented an online monitoring program for 213 plant species. In this pilot year of...
Detecting Ecosystem Performance Anomalies for Land Management in the Upper Colorado River Basin Using Satellite Observations, Climate Data, and Ecosystem Models
Yingxin Gu, Bruce K. Wylie
2010, Remote Sensing (2) 1880-1891
This study identifies areas with ecosystem performance anomalies (EPA) within the Upper Colorado River Basin (UCRB) during 2005–2007 using satellite observations, climate data, and ecosystem models. The final EPA maps with 250-m spatial resolution were categorized as normal performance, underperformance, and overperformance (observed performance relative to weather-based predictions) at the...
2009 Spawning cisco investigations in the Canadian waters of Lake Superior
Daniel L. Yule, Gary A. Cholwek, Lori M. Evrard, E. Berglund, K.I. Cullis
2010, Report
We sampled with acoustics (AC) and midwater trawls (MT) to determine cisco abundance in Lake Superior’s Thunder and Black bays during 8-14 November, 2009. Total abundance of spawning-size (≥ 250 mm total length) ciscoes was estimated at 6.25 million in Thunder Bay and 1.12 million in Black Bay. Exploitation fractions...
Pier and contraction scour prediction in cohesive soils at selected bridges in Illinois
Timothy D. Straub, Thomas M. Over
2010, Report
This report presents the results of testing the Scour Rate In Cohesive Soils-Erosion Function Apparatus (SRICOS-EFA) method for estimating scour depth of cohesive soils at 15 bridges in Illinois. The SRICOS-EFA method for complex pier and contraction scour in cohesive soils has two primary components. The first component includes the...
Tolerance of nonindigenous cichlid fishes (Cichlasoma urophthalmus, Hemichromis letourneuxi) to low temperature: laboratory and field experiments in south Florida
Pamela J. Schofield, William F. Loftus, Robert M. Kobza, Mark I. Cook, Daniel H. Slone
2010, Biological Invasions (12) 2441-2457
The cold tolerance of two non-native cichlids (Hemichromis letourneuxi and Cichlasoma urophthalmus) that are established in south Florida was tested in the field and laboratory. In the laboratory, fishes were acclimated to two temperatures (24 and 28°C), and three salinities (0, 10, and 35 ppt). Two endpoints were identified: loss of equilibrium...
Scenario-building for the Deepwater Horizon oil spill
Gary Machlis, Marcia K. McNutt
2010, Science (329) 1018-1019
In May 2010, the U.S. Department of the Interior (DOI) established a Strategic Sciences Working Group (SSWG) to assess how the Deepwater Horizon (DH) oil spill may impact the ecology, economy, and people of the Gulf of Mexico (GOM). It included scientists from diverse disciplines and federal, academic, and nongovernmental...
Ecological models supporting environmental decision making: A strategy for the future
Amelie Schmolke, Pernille Thorbek, Donald L. DeAngelis, Volker Grimm
2010, Trends in Ecology and Evolution (25) 479-486
Ecological models are important for environmental decision support because they allow the consequences of alternative policies and management scenarios to be explored. However, current modeling practice is unsatisfactory. A literature review shows that the elements of good modeling practice have long been identified but are widely ignored. The reasons for...
The thermal signature of volcanic eruptions on Io and Earth,
Ashley G. Davies, Laszlo P. Keszthelyi, Andrew J. L. Harris
2010, Journal of Volcanology and Geothermal Research (194) 75-99
We investigate a spectrum-based technique to identify the style of active volcanic eruptions on Jupiter's moon Io. Thermal remote sensing of Io has had to rely primarily on low-spatial-resolution data, similar to low-spatial-resolution satellite data applied to detecting and charting the temporal evolution of terrestrial hot spots. These terrestrial analyses use data from...
Seismic characterization of the fall 2007 eruptive sequence at Bezymianny Volcano, Russia
Weston A. Thelen, Michael West, Sergey Senyukov
2010, Journal of Volcanology and Geothermal Research (194) 201-213
We examine an eruptive sequence in late 2007 at Bezymianny Volcano to characterize the magmatic plumbing system and eruption-related seismicity. Earthquake locations reveal seismicity below and offset to the north of the volcano along a tectonic fault. Based on historical seismicity, the magma chamber is postulated to have a top...
Global climate changes recorded in coastal wetland sediments: Empirical observations linked to theoretical predictions
Alexander S. Kolker, Matthew L. Kirwan, Steven L. Goodbred, J. Kirk Cochran
2010, Geophysical Research Letters (37)
Whether coastal areas are experiencing, and responding to, an accelerated rate of global sea-level rise (GSLR) is critically important for the ∼2 billion people living near Earth's oceans. Accretion rates from a suite of physiographically diverse coastal wetlands surrounding Long Island, NY accelerated during the 20th century at 2.3 ±...
The use of the Sonoran Desert as a pseudo-invariant site for optical sensor cross-calibration and long-term stability monitoring
A. Angal, Gyanesh Chander, Taeyoung Choi, Aisheng Wu, Xiaoxiong Xiong
2010, Conference Paper, Geoscience and Remote Sensing Symposium (IGARSS), 2010 IEEE International
The Sonoran Desert is a large, flat, pseudo-invariant site near the United States-Mexico border. It is one of the largest and hottest deserts in North America, with an area of 311,000 square km. This site is particularly suitable for calibration purposes because of its high spatial and spectral uniformity and...
Use of EO-1 Hyperion data to calculate spectral band adjustment factors (SBAF) between the L7 ETM+ and Terra MODIS sensors
Gyanesh Chander, N. Mishra, Dennis L. Helder, David Aaron, T. Choi, A. Angal, X. Xiong
2010, Conference Paper, IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2010 : 25 - 30 July 2010, Honolulu, Hawaii, USA
Different applications and technology developments in Earth observations necessarily require different spectral coverage. Thus, even for the spectral bands designed to look at the same region of the electromagnetic spectrum, the relative spectral responses (RSR) of different sensors may be different. In this study, spectral band adjustment factors (SBAF) are...
Operational calibration and validation of landsat data continuity mission (LDCM) sensors using the image assessment system (IAS)
Esad Micijevic, Ron Morfitt
2010, Conference Paper, Geoscience and Remote Sensing Symposium (IGARSS), 2010 IEEE International
Systematic characterization and calibration of the Landsat sensors and the assessment of image data quality are performed using the Image Assessment System (IAS). The IAS was first introduced as an element of the Landsat 7 (L7) Enhanced Thematic Mapper Plus (ETM+) ground segment and recently extended to Landsat 4 (L4)...
An overview of the web-based Google Earth coincident imaging tool
Gyanesh Chander, B. Kilough, S. Gowda
2010, Conference Paper, Geoscience and Remote Sensing Symposium (IGARSS), 2010 IEEE International
The Committee on Earth Observing Satellites (CEOS) Visualization Environment (COVE) tool is a browser-based application that leverages Google Earth web to display satellite sensor coverage areas. The analysis tool can also be used to identify near simultaneous surface observation locations for two or more satellites. The National Aeronautics and Space...
Limiting factors of four rare plant species in `Ōla`A Forest of Hawai'i Volcanoes National Park
Joshua R. VanDeMark, Linda W. Pratt, Melody Euaparadorn
2010, Technical Report HCSU-018
Three endangered or candidate endangered plant species native to `Ōla`a Forest (Cyrtandra giffardii, ha`iwale; Phyllostegia floribunda, a mint with no common name; and Sicyos alba, `ānunu) were studied for more than 2 years to determine their stand structures, short-term mortality rates, patterns of reproductive phenology, success of fruit production, seed...