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Articles 11251 - 11280 of 15736
Full-Text Articles in Oceanography and Atmospheric Sciences and Meteorology
Final Report Regional Lake Management Planning For Tmdl Development, Mark Sytsma
Final Report Regional Lake Management Planning For Tmdl Development, Mark Sytsma
Center for Lakes and Reservoirs Publications and Presentations
Since the mid-1900’s, invasive aquatic weeds have been a significant problem in many of the lakes of the Clatsop Plains on the northern Oregon Coast. Weeds interfere with beneficial uses, such as boating, fishing and swimming, and have dramatically altered the chemical and biological features of the lakes. In 1994, the Oregon Department of Environmental Quality (ODEQ) added three of the lakes, Cullaby, Smith and Sunset, to the 303 (d) list of water quality impaired waters, due to the presence of the invasive aquatic weeds. ODEQ contracted with the Center for Lakes and Reservoirs and the Geology Department at PSU …
Circulation, Vol. 12, No. 2, Center For Coastal Physical Oceanography, Old Dominion University, Marjorie Friedrichs
Circulation, Vol. 12, No. 2, Center For Coastal Physical Oceanography, Old Dominion University, Marjorie Friedrichs
CCPO Circulation
Fall 2005 issue of CCPO Circulation featuring article "The Regional Ecosystem Modeling Testbed Project" by Dr. Marjorie Friedrichs
Fall 2005, Nsu Oceanographic Center
Alaska Aquatic Plant Survey Report 2005, Mary Pfauth, Mark Sytsma
Alaska Aquatic Plant Survey Report 2005, Mary Pfauth, Mark Sytsma
Center for Lakes and Reservoirs Publications and Presentations
Invasive, non-indigenous plants can degrade water quality and fish habitat when they invade lakes, ponds, and streams. Changes in plant community architecture in lakes due to invasion by canopy-forming invasive aquatic plants can result in loss of native plant biodiversity and reduction of the structural complexity of the underwater habitat.
Capacity Building In Ocean Bathymetry: The Nippon Foundation Gebco Training Programme At The University Of New Hampshire, Srinivas Karlipata, Dave Monahan, H M. Caceres, Taisei Morishita, Abubakar Mustapha, Walter Reynoso Peralta, Shereen Sharma, Clive Angwenyi
Capacity Building In Ocean Bathymetry: The Nippon Foundation Gebco Training Programme At The University Of New Hampshire, Srinivas Karlipata, Dave Monahan, H M. Caceres, Taisei Morishita, Abubakar Mustapha, Walter Reynoso Peralta, Shereen Sharma, Clive Angwenyi
Center for Coastal and Ocean Mapping
A successful Capacity Building project in hydrography is underway at the University of New Hampshire. Organised by the General Bathymetric Chart of the Oceans and sponsored by the Nippon Foundation, the programme trains hydrographers and other marine scientists in bathymetric mapping. Participants are formally prepared to produce bathymetric maps when they return to their home countries through a combination of graduate level courses and workshops, practical field training, participation in deep ocean research cruises, working visits to other laboratories and institutions, focused lectures from visiting experts, and the preparation of a bathymetry map of their area from public domain data. …
Characterization Of Pfiesteria Ichthyocidal Activity, Andrew S. Gordon, Harold G. Marshall, Sandra E. Shumway, Kathryn J. Coyne, Alan J. Lewitus, Michael A. Mallin, Parke A. Rublee
Characterization Of Pfiesteria Ichthyocidal Activity, Andrew S. Gordon, Harold G. Marshall, Sandra E. Shumway, Kathryn J. Coyne, Alan J. Lewitus, Michael A. Mallin, Parke A. Rublee
Biological Sciences Faculty Publications
Letter to the Editor regarding article: Drgon, T., et al. 2005. Characterization of ichthyocidal activity of Pfiesteria piscicida: Dependence on the dinospore cell density. Appl. Environ. Microbiol. 71:519–529
High-Resolution Sonar Surveying: Techniques And Strategies For Improved Micro-Bathymetic Mapping, Vicki Ferrini, D. Fornari, T. Shank, D. Kelley, M. Tivey, S. Carbotte, D. Glickson, C. Roman, A. Sterling
High-Resolution Sonar Surveying: Techniques And Strategies For Improved Micro-Bathymetic Mapping, Vicki Ferrini, D. Fornari, T. Shank, D. Kelley, M. Tivey, S. Carbotte, D. Glickson, C. Roman, A. Sterling
Christopher N. Roman
No abstract provided.
Lake-Level Influences On Chironomid-Based Reconstructions Of Paleotemperature, Ann Dieffenbacher-Krall
Lake-Level Influences On Chironomid-Based Reconstructions Of Paleotemperature, Ann Dieffenbacher-Krall
University of Maine Office of Research Administration: Grant Reports
This award is for support of a study to determine the influence of lake-level changes on chironomid-based temperature estimates. A transect of cores from within each of two lakes in northern Maine will be examined for evidence of past water levels. Chironomid analysis will be performed on cores from both lakes. Geologic/chronologic evidence of Younger Dryas-age ice readvance in northern Maine will provide the data necessary to apply a well-developed glaciological model to determine the range of temperature and precipitation that could possibly have prevailed during this period. Chironomid estimates of temperature will be reconciled with the temperature range derived …
Nonlinear Dynamics In Ecosystem Response To Climatic Change: Case Studies And Policy Implications, Virginia R. Burkett, Douglas A. Wilcox, Wilcox Stottlemyer, Wylie Barrow, Dan Fagre, Jill Baron, Jeff Price, Jennifer L. Nielsen, Craig D. Allen, David L. Peterson, Greg Ruggerone, Thomas Doyle
Nonlinear Dynamics In Ecosystem Response To Climatic Change: Case Studies And Policy Implications, Virginia R. Burkett, Douglas A. Wilcox, Wilcox Stottlemyer, Wylie Barrow, Dan Fagre, Jill Baron, Jeff Price, Jennifer L. Nielsen, Craig D. Allen, David L. Peterson, Greg Ruggerone, Thomas Doyle
United States Geological Survey: Staff Publications
Many biological, hydrological, and geological processes are interactively linked in ecosystems. These ecological phenomena normally vary within bounded ranges, but rapid, nonlinear changes to markedly different conditions can be triggered by even small differences if threshold values are exceeded. Intrinsic and extrinsic ecological thresholds can lead to effects that cascade among systems, precluding accurate modeling and prediction of system response to climate change. Ten case studies from North America illustrate how changes in climate can lead to rapid, threshold-type responses within ecological communities; the case studies also highlight the role of human activities that alter the rate or direction of …
Catlett-Burruss Research And Education Laboratory Dedication Ceremony, College Of William And Mary, Virginia Institute Of Marine Science, Chesapeake Bay National Estuarine Research Reserve In Virginia
Catlett-Burruss Research And Education Laboratory Dedication Ceremony, College Of William And Mary, Virginia Institute Of Marine Science, Chesapeake Bay National Estuarine Research Reserve In Virginia
Miscellaneous
Brochure for Dedication: Program of events celebrating the dedication of the Catlett-Burruss Research and Education Laboratory and honoring Dr. William Reay with the NOAA Environmental Hero Award.
Uvsd: Software For Detection Of Color Underwater Features, Yuri Rzhanov, Anton Mamaenko, M Yoklavich
Uvsd: Software For Detection Of Color Underwater Features, Yuri Rzhanov, Anton Mamaenko, M Yoklavich
Center for Coastal and Ocean Mapping
Underwater Video Spot Detector (UVSD) is a software package designed to analyze underwater video for continuous spatial measurements (path traveled, distance to the bottom, roughness of the surface etc.) Laser beams of known geometry are often used in underwater imagery to estimate the distance to the bottom. This estimation is based on the manual detection of laser spots which is labor intensive and time consuming so usually only a few frames can be processed this way. This allows for spatial measurements on single frames (distance to the bottom, size of objects on the sea-bottom), but not for the whole video …
Final Report: Evaluation Of The Morphoedaphic Index And Sediment Diatoms For Inference Of Pre-European Settlement Total Phosphorus Concentration In Epa Region 10 Lakes, Rich Miller, Aaron Hook, Richard Petersen, Mark D. Sytsma
Final Report: Evaluation Of The Morphoedaphic Index And Sediment Diatoms For Inference Of Pre-European Settlement Total Phosphorus Concentration In Epa Region 10 Lakes, Rich Miller, Aaron Hook, Richard Petersen, Mark D. Sytsma
Center for Lakes and Reservoirs Publications and Presentations
Water quality in many Northwest lakes has declined over the past century due, in part, to increased anthropogenic nutrient loading (Edmonson and Lehman, 1981). Under the Clean Water Act, resource managers such as the Washington Department of Ecology, Oregon Department of Environmental Quality, and tribes are responsible for restoring and protecting the integrity of these waters. Targets for restoration or criteria for impairment are not well defined, however, and may naturally vary by geology, hydrology, morphometry, and climate.
One way to determine whether lakes are impaired and to identify restoration targets is to assess lake reference conditions (EPA 2000). Reference …
A New Pathway For Communicating The 11-Year Solar Cycle Signal To The Qbo, Eugene C. Cordero, Terrence R. Nathan
A New Pathway For Communicating The 11-Year Solar Cycle Signal To The Qbo, Eugene C. Cordero, Terrence R. Nathan
Faculty Publications, Meteorology and Climate Science
[1] The response of the equatorial quasi-biennial oscillation (QBO) to zonal-mean ozone perturbations consistent with the 11-year solar cycle is examined using a 2 1/2 dimensional model of the tropical stratosphere. Unique to this model are wave-ozone feedbacks, which provide a new, nonlinear pathway for communicating solar variability effects to the QBO. Model simulations show that for zonal-mean ozone perturbations representative of solar maximum (minimum), the diabatic heating due to the wave-ozone feedbacks is primarily responsible for driving a slightly stronger (weaker) QBO circulation and producing a slightly shorter (longer) QBO period. These results, which are explained via an analytical …
Seafloor Characterization Through The Application Of Avo Analysis To Multibeam Sonar Data, Luciano E. Fonseca, Larry A. Mayer, Barbara J. Kraft
Seafloor Characterization Through The Application Of Avo Analysis To Multibeam Sonar Data, Luciano E. Fonseca, Larry A. Mayer, Barbara J. Kraft
Center for Coastal and Ocean Mapping
In the seismic reflection method, it is well known that seismic amplitude varies with the offset between the seismic source and detector and that this variation is a key to the direct determination of lithology and pore fluid content of subsurface strata. Based on this fundamental property, amplitude-versus-offset (AVO) analysis has been used successfully in the oil industry for the exploration and characterization of subsurface reservoirs. Multibeam sonars acquire acoustic backscatter over a wide range of incidence angles and the variation of the backscatter with the angle of incidence is an intrinsic property of the seafloor. Building on this analogy, …
Measurement Of In Situ Acoustic Properties For The Onr Geoclutter Program, Annual Report, Geoclutter Program, Larry A. Mayer, Barbara J. Kraft, Luciano E. Fonseca
Measurement Of In Situ Acoustic Properties For The Onr Geoclutter Program, Annual Report, Geoclutter Program, Larry A. Mayer, Barbara J. Kraft, Luciano E. Fonseca
Center for Coastal and Ocean Mapping
No abstract provided.
A New Pathway For Communicating The 11-Year Solar Cycle Signal To The Qbo, Eugene C. Cordero, Terrence R. Nathan
A New Pathway For Communicating The 11-Year Solar Cycle Signal To The Qbo, Eugene C. Cordero, Terrence R. Nathan
Eugene C. Cordero
[1] The response of the equatorial quasi-biennial oscillation (QBO) to zonal-mean ozone perturbations consistent with the 11-year solar cycle is examined using a 2 1/2 dimensional model of the tropical stratosphere. Unique to this model are wave-ozone feedbacks, which provide a new, nonlinear pathway for communicating solar variability effects to the QBO. Model simulations show that for zonal-mean ozone perturbations representative of solar maximum (minimum), the diabatic heating due to the wave-ozone feedbacks is primarily responsible for driving a slightly stronger (weaker) QBO circulation and producing a slightly shorter (longer) QBO period. These results, which are explained via an analytical …
A Comparison Of Diets And Water Agitation Methods For Larval Culture Of The Edible Sea Urchin, Tripneustes Ventricosus (Echinodermata: Echinoidea), Ray Wolcott, Charles G. Messing
A Comparison Of Diets And Water Agitation Methods For Larval Culture Of The Edible Sea Urchin, Tripneustes Ventricosus (Echinodermata: Echinoidea), Ray Wolcott, Charles G. Messing
Marine & Environmental Sciences Faculty Articles
Tripneustes ventricosus (Lamarck, 1816) has been harvested for human consumption in the Caribbean for centuries, where harvest rates occasionally exceed sustainability. Historically a backreef and grass-bed urchin, the species has recently been observed on the forereef where it appears to control macroalgal growth in the absence of Diadema antillarum (Philippi, 1845) (Woodley and Gayle, 1999). Large-scale culturing has the potential to produce T. ventricosus in sufficient numbers for remediation of degraded coral reefs, restocking of nearshore habitats, and development of an aquaculture industry for one or more Caribbean islands. We report the first successful culturing of T. ventricosus from fertilization …
Aquaculture-Based Calibration Of The M.Edulis Isotope Paleothermometer, Karl J. Kreutz, Harold Borns, Douglas Introne, Bruce Barber, Sven Funder
Aquaculture-Based Calibration Of The M.Edulis Isotope Paleothermometer, Karl J. Kreutz, Harold Borns, Douglas Introne, Bruce Barber, Sven Funder
University of Maine Office of Research Administration: Grant Reports
Oxygen isotopic analysis of marine carbonate shells (δ18Oc) is a standard paleoceanographic technique used to document the chronology of seawater temperature change. Shell δ18Oc depends not only upon seawater temperature, but also upon the isotopic composition of the seawater (δ18Ow; related to salinity) and any species-specific fractionation that occurs during biomineralization. In the past, the interpretation of shell δ18Oc has been based upon theoretical studies of chemical equilibrium and kinetics, or laboratory experiments involving the inorganic precipitation of CaCO3 from solution. Other methods have employed …
The Open Navigation Surface Project, Brian R. Calder, Shannon Byrne, Bill Lamey, Rick T. Brennan, James D. Case, David Fabre, Barry Gallagher, R Wade Ladner, Friedhelm Moggert, Mark Paton
The Open Navigation Surface Project, Brian R. Calder, Shannon Byrne, Bill Lamey, Rick T. Brennan, James D. Case, David Fabre, Barry Gallagher, R Wade Ladner, Friedhelm Moggert, Mark Paton
Center for Coastal and Ocean Mapping
Many hydrographic and oceanographic agencies have moved or are moving towards gridded bathymetric products. However, there is no accepted format to allow these grids to be exchanged while maintaining data and metadata integrity. This paper describes the Open Navigation Surface (ONS) Project, which aims to fill this gap. The ONS Project is an open-source software project designed to provide a freely available, portable source-code library to encapsulate gridded bathymetric surfaces with associated uncertainty values. The data file format is called a Bathymetric Attributed Grid (BAG). The BAG is developed and maintained by the ONS Working Group (ONSWG), and the source …
Summer 2005, Nsu Oceanographic Center
Mass Loading Measurements In Amargosa Valley, John C. Sagebiel, Alan W. Gertler, Amy J. Smiecinski, David Shafer
Mass Loading Measurements In Amargosa Valley, John C. Sagebiel, Alan W. Gertler, Amy J. Smiecinski, David Shafer
Publications (YM)
This work will be conducted under Task DRI-FI-001, “Mass Loading Measurements in Amargosa Valley.” The objective of this task is to measure, with known accuracy, the levels of atmospheric mass loading (mass concentration of suspended particulates) accompanying soil surface disturbing activities in Amargosa Valley. Mass loading is used in the biosphere model to calculate inhalation exposure for the human receptor, the maximally reasonably exposed individual (RMEI). The mass loading currently used in the biosphere model is based on literature data from the analog sites rather than on site-specific conditions. This work is subject to the Nevada System of Higher Education …
Applying The Test Of Appurtenance Globally: A New Inventory Of Wide Margin States From Public Domain Data, Dave Monahan, Robert Van De Poll, Sara Cockburn
Applying The Test Of Appurtenance Globally: A New Inventory Of Wide Margin States From Public Domain Data, Dave Monahan, Robert Van De Poll, Sara Cockburn
Center for Coastal and Ocean Mapping
No abstract provided.
U.S. Law Of The Sea Cruise To Map The Foot Of The Slope And 2500-M Isobath Of The Northeast U.S. Atlantic Continental Margin: Legs 4 And 5. Cruise Report, Doug Cartwright, James V. Gardner
U.S. Law Of The Sea Cruise To Map The Foot Of The Slope And 2500-M Isobath Of The Northeast U.S. Atlantic Continental Margin: Legs 4 And 5. Cruise Report, Doug Cartwright, James V. Gardner
Center for Coastal and Ocean Mapping
U.S. Law of the Sea cruise to map the foot of the slope and 2500-m isobath of the Northeast US Atlantic continental margin: Legs 4 and 5
CRUISES PF05-1 and 2
April 25 to June 30, 2005
Norfolk, VA to Port Canaveral, FL
Improved Vehicle Based Multibeam Bathymetry Using Sub-Maps And Slam, Christopher Roman, Hanumant Singh
Improved Vehicle Based Multibeam Bathymetry Using Sub-Maps And Slam, Christopher Roman, Hanumant Singh
Christopher N. Roman
This paper presents an algorithm to improve sub-sea acoustic multibeam bottom mapping based on the simultaneous mapping and localization (SLAM) methodology. Multibeam bathymetry from underwater water vehicles can yield valuable large scale terrain maps of the sea door, but the overall accuracy of these maps is typically limited by the accuracy of the vehicle position estimates. The solution presented here uses small bathymetric patches created over short time scales in a sub-mapping context. These patches are registered with respect to one another and assembled in a single coordinate frame to produce a more accurate terrain estimate and provide improved renavigation …
Glacial History Of The Amundsen Sea Shelf, Thomas B. Kellogg, Daniel Belknap, Davida Kellogg, Terence Hughes
Glacial History Of The Amundsen Sea Shelf, Thomas B. Kellogg, Daniel Belknap, Davida Kellogg, Terence Hughes
University of Maine Office of Research Administration: Grant Reports
This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a marine geological investigation of the Amundsen Sea region toward a better understanding of the deglaciation history of the West Antarctic Ice Sheet (WAIS). The WAIS may be inherently unstable because it is the last marine-based ice sheet in the world. Unlike other embayments in West Antarctica, major ice streams draining into the Amundsen Sea from the interior of the WAIS lack buttressing ice shelves. Mass balance data for the distal portions of these ice streams (Pine Island and Thwaites glaciers) appear to …
Phytoplankton Development Within Tidal Freshwater Regions Of Two Virginia Rivers, Harold G. Marshall, Lubomira Burchardt
Phytoplankton Development Within Tidal Freshwater Regions Of Two Virginia Rivers, Harold G. Marshall, Lubomira Burchardt
Virginia Journal of Science
Phytoplankton composition and the range of seasonal patterns of abundance are presented for the tidal freshwater regions in two Virginia rivers based on data accumulated monthly from 1986 through 1999. Diatoms dominated the flora during spring, summer, and fall, whereas, other taxonomic categories were more representative when the river flow rates decreased, allowing for a more stable water system and increased residency time within this tidal region during summer and early fall. This summer/fall period was associated with increased water temperatures, higher productivity rates and chlorophyll levels, increased total phytoplankton abundance and species diversity. The major components of the summer …
The 2004 Vaca Pateau Geoarcheology Expedition - Belize, Lee J. Florea, Beth Fratesi, Philip Reeder, Amber Yuellig
The 2004 Vaca Pateau Geoarcheology Expedition - Belize, Lee J. Florea, Beth Fratesi, Philip Reeder, Amber Yuellig
Lee J Florea, PhD, P.G.
No abstract provided.
A Sensor Fusion Approach To Coastal Mapping, Maryellen Sault, Christopher Parrish, Stephen A. White, Jon Sellars, Jason Woolard
A Sensor Fusion Approach To Coastal Mapping, Maryellen Sault, Christopher Parrish, Stephen A. White, Jon Sellars, Jason Woolard
Center for Coastal and Ocean Mapping
NOAA’s National Geodetic Survey (NGS) is responsible for mapping the national shoreline. This shoreline provides the critical baseline for demarcating the United States’ marine territorial limits, including its Exclusive Economic Zone; and is used in updating NOAA nautical charts and management of coastal resourses. NGS conducted a data fusion research project in collaboration with the Joint Airborne Lidar Bathymetric Technical Center of Expertise (JALBTCX) and other NOAA partners. In March and April of 2004, hyperspectral imagery, topographic lidar data, and highresolution digital color imagery were collected simultaneously aboard the NOAA Citation for coastal project areas in Florida and California. The …
The Use Of Multi-Beam Sonars To Image Bubbly Ship Wakes, R Lee Culver, Thomas C. Weber, David L. Bradley
The Use Of Multi-Beam Sonars To Image Bubbly Ship Wakes, R Lee Culver, Thomas C. Weber, David L. Bradley
Center for Coastal and Ocean Mapping
During the past five years, researchers at Penn State University (PSU) have used upward-looking multi-beam (MB) sonar to image the bubbly wakes of surface ships. In 2000, a 19-beam, 5° beam width, 120° sector, 250 kHz MB sonar integrated into an autonomous vehicle was used to obtain a first-of-a-kind look at the three-dimensional variability of bubbles in a large ship wake. In 2001 we acquired a Reson 8101 MB sonar, which operates at 240 kHz and features 101-1.5º beams spanning a 150º sector. In July 2002, the Reson sonar was deployed looking upward from a 1.4 m diameter buoy moored …
Interannual Variation Of Stratification In Lower Chesapeake Bay, Christopher S. Katzenmiller
Interannual Variation Of Stratification In Lower Chesapeake Bay, Christopher S. Katzenmiller
OES Theses and Dissertations
Stratification in the water column can prove to be an important indicator to the state of the water column and ecosystem. The focus of this research is to evaluate trends in stratification in the Lower Chesapeake Bay. Detailed analysis was performed on a 14 year data set to study interannual variation in the region of study. Potential energy anomaly was used to quantify stratification. Potential energy anomaly is the amount of energy required to mix a water column. It is determined from the vertical density structure of density. Potential energy anomaly is the departure of potential energy from climate conditions. …