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Oceanography and Atmospheric Sciences and Meteorology

William & Mary

2009

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Articles 1 - 30 of 33

Full-Text Articles in Physical Sciences and Mathematics

Changes In Continental Freshwater Discharge From 1948 To 2004, Aiguo Dai, Taotao Qian, Kevin E. Trenberth, John D. Millliman May 2009

Changes In Continental Freshwater Discharge From 1948 To 2004, Aiguo Dai, Taotao Qian, Kevin E. Trenberth, John D. Millliman

VIMS Articles

A new dataset of historical monthly streamflow at the farthest downstream stations for the world’s 925 largest ocean-reaching rivers has been created for community use. Available new gauge records are added to a network of gauges that covers ∼80 × 106 km2 or ∼80% of global ocean-draining land areas and accounts for about 73% of global total runoff. For most of the large rivers, the record for 1948–2004 is fairly complete. Data gaps in the records are filled through linear regression using streamflow simulated by a land surface model [Community Land Model, version 3 (CLM3)] forced with observed …


York River Water Budget, Carl Hershner, Molly Mitchell, Donna Marie Bilkovic, Julie D. Herman, Center For Coastal Resources Management, Virginia Institute Of Marine Science Jan 2009

York River Water Budget, Carl Hershner, Molly Mitchell, Donna Marie Bilkovic, Julie D. Herman, Center For Coastal Resources Management, Virginia Institute Of Marine Science

Reports

No abstract provided.


2009 Chesapeake Bay Bridge Tunnel Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans Jan 2009

2009 Chesapeake Bay Bridge Tunnel Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans

Miscellaneous

These calendars are produced monthly using David Evans' Tidecal.


2009 Hampton Roads Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans Jan 2009

2009 Hampton Roads Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans

Miscellaneous

These calendars are produced monthly using David Evans' Tidecal.


2009 Gloucester Point Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans Jan 2009

2009 Gloucester Point Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans

Miscellaneous

These calendars are produced monthly using David Evans' Tidecal.


Andrews Hall And Seawater Research Laboratory Dedication, Virginia Institute Of Marine Science; College Of William And Mary Jan 2009

Andrews Hall And Seawater Research Laboratory Dedication, Virginia Institute Of Marine Science; College Of William And Mary

Miscellaneous

Dedication: April 16, 2009. Program of events.


2009 Wachapreague Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans Jan 2009

2009 Wachapreague Station Tide Prediction Calendars, Virginia Institute Of Marine Science, David A. Evans

Miscellaneous

These calendars are produced monthly using David Evans' Tidecal.


Vulnerability Of Shallow Tidal Water Habitats In Virginia To Climate Change, Donna Marie Bilkovic, Carl H. Herschner, Tamia Rudnicky, Karinna Nunez, Daniel E. Schatt, Sharon Kileen, Marcia Berman, Center For Coastal Resources Management, Virginia Institute Of Marine Science Jan 2009

Vulnerability Of Shallow Tidal Water Habitats In Virginia To Climate Change, Donna Marie Bilkovic, Carl H. Herschner, Tamia Rudnicky, Karinna Nunez, Daniel E. Schatt, Sharon Kileen, Marcia Berman, Center For Coastal Resources Management, Virginia Institute Of Marine Science

Reports

The principal objective of this study was to develop a characterization of current shallow-water habitat components in Virginia tidal waters and predict climate driven changes to these habitats. To project broad-scale climate change effects on the abundance and distribution of coastal habitats, an inundation model based on anticipated relative sea-level rise, temperature and salinity projections, and coastal development were integrated into a GIS modeling framework. Using this framework, simple models were constructed that forecast the distribution of key coastal habitat parameters within the next 50 to 100 years including: shallow-water areas, tidal wetlands, submerged aquatic vegetation and estuarine beaches. The …


Anthropogenic Causes Of Copepod Mortality And Bacterial Decomposition Of Copepod Carcasses, Samantha L. Bickel Jan 2009

Anthropogenic Causes Of Copepod Mortality And Bacterial Decomposition Of Copepod Carcasses, Samantha L. Bickel

Dissertations, Theses, and Masters Projects

Although zooplankton carcasses can be quite prevalent within aquatic systems, they have largely been overlooked in most zooplankton population studies. Anthropogenic stressors can potentially increase the overall abundance of carcasses on a local scale. Once a carcass is present within a system, the fate of its biomass is of considerable interest as it may be remineralized within the water column or transported to depth. Through the collection of field samples I assessed the possibility of an anthropogenic stressor (boat-generated turbulence) as a potential source of nonconsumptive mortality. I also conducted a series of laboratory experiments to monitor the decomposition of …


Development Of A Storm Surge Model Using A High-Resolution Unstructured Grid Over A Large Domain, Tao Shen Jan 2009

Development Of A Storm Surge Model Using A High-Resolution Unstructured Grid Over A Large Domain, Tao Shen

Dissertations, Theses, and Masters Projects

A quasi-3D storm surge modeling system was developed for forecasting the storm surge and inundation in the Chesapeake Bay. The system was constructed with one large unstructured grid covering the Atlantic Coast from Nova Scotia to Florida and a smaller, limited domain unstructured grid covering the Chesapeake Bay, Virginia Beach, Hampton Roads and the adjacent continental shelf regions. It was demonstrated that, with the large domain grid, the model could simulate the hurricane induced storm surge reasonably well using astronomical tide at the open boundary condition and in turn, provide boundary condition for the limited domain model. Since the difficulty …


Hydrography And Phytoplankton Distribution In The Amundsen And Ross Seas, Glaucia M. Fragoso Jan 2009

Hydrography And Phytoplankton Distribution In The Amundsen And Ross Seas, Glaucia M. Fragoso

Dissertations, Theses, and Masters Projects

The phytoplankton of the Ross Sea have been intensively studied during the last decade, as opposed to the Amundsen Sea, where virtually nothing is known about phytoplankton taxonomy and distribution. Blooms in the Ross Sea are usually composed of diatoms and the prymnesiophyte Phaeocystis antarctica; diatoms are often dominant in strongly stratified waters during the summer, whereas P. antarctica usually dominates in less stratified waters in the south-central polynya during spring. This study focused on understanding the environmental variables that influence the spatial patterns of phytoplankton assemblages during late summer and early fall, 2007, and late spring and early summer, …


Nutrient Loading And System Response In The Coastal Lagoons Of The Delmarva, Juliette Christina Poleto Giordano Jan 2009

Nutrient Loading And System Response In The Coastal Lagoons Of The Delmarva, Juliette Christina Poleto Giordano

Dissertations, Theses, and Masters Projects

No abstract provided.


Variability In Juvenile Growth, Mortality, Maturity, And Abundance Of American Shad And Blueback Herring In Virginia, Troy D. Tuckey Jan 2009

Variability In Juvenile Growth, Mortality, Maturity, And Abundance Of American Shad And Blueback Herring In Virginia, Troy D. Tuckey

Dissertations, Theses, and Masters Projects

Young-of-year (YOY) population dynamics of American shad and blueback herring in Virginia's rivers were examined with an emphasis on variability in growth and mortality rates. In addition, an analysis was conducted to relate juvenile abundance indices of American shad to adult indices to establish a stock-recruitment relationship. to accomplish the stock recruitment relationship, an additional study that examined maturation schedules and inter-annual variability in maturation schedules among stocks was performed. Results of population dynamics studies found that growth and mortality rates of American shad and blueback herring varied by river and year and that conspecific abundance was an important factor …


Numerical Modeling Of Eutrophication Dynamics In The Shallow Coastal Ecosystem: A Case Study In The Maryland And Virginia Coastal Bays, Taiping Wang Jan 2009

Numerical Modeling Of Eutrophication Dynamics In The Shallow Coastal Ecosystem: A Case Study In The Maryland And Virginia Coastal Bays, Taiping Wang

Dissertations, Theses, and Masters Projects

Shallow coastal bays and lagoons (mean depths <2-3 meters) are important buffer zones and links between terrestrial and deep marine ecosystems. They are inherently vulnerable to eutrophication, and are normally dominated by benthic primary producers such as seagrass, benthic micro- and macroalgae. There is an urgent need for quantitative models that are specifically designed for studying eutrophication dynamics in shallow coastal ecosystems. In this study, a hydrodynamic and water quality modeling system consisting of the hydrodynamic model UnTRIM and the water quality model CE-QUAL-ICM was applied to a representative shallow coastal bay ecosystem, the Maryland and Virginia Coastal Bays (MVCBs). A high-resolution unstructured model grid was generated to resolve the complex geometry. to address the important role played by benthic macroalgae, a benthic macroalgal module, which assimilated macroalgal kinetics from literature and recent laboratory studies, was incorporated into the water quality model framework. The module includes two representative macroalgal species, Ulva lactuca and Gracilaria vermiculophylla , common in the MVCBs, and employs the internal nutrient-limited growth kinetics proposed by Droop. The numerical modeling system has been calibrated against a comprehensive field monitoring data collected by the Maryland Department of Natural Resources in the MVCBs. The data include water level, current velocity, salinity, and major water quality variables, such as chlorophyll a, dissolved oxygen, and nutrients. The calibrated hydrodynamic model was used to calculate the physical transport time scales. The model estimated flushing time for the entire system is on the order of 2-3 months, which are much longer than typical time scales required by most biological processes. In addition, the local residence time is found to be extremely variable throughout the system. Depending on locations, the local residence time can vary from 0 to more than 200 days. The calculated transport time scales were further compared with spatial water quality distributions in the system. The comparisons demonstrate that physical circulations could substantially modulate biological processes in the system. By using the Droop equation, the benthic macroalgae's unique property, the so-called luxury uptake, was satisfactorily captured. Furthermore, the characteristic boom-and-bust life cycle of benthic macroalgae was qualitatively simulated using a box model. The expanded water quality model that includes the benthic macroalgal module reproduced both temporal and spatial distributions of observed benthic macroalgae and major water quality variables reasonably well in the MVCBs. The model results indicate that benthic macroalgae are highly important in regulating ecosystem metabolism in areas where they are abundant. Moreover, spring phytoplankton bloom was substantially suppressed when benthic macroalgae were present. The incorporation of a benthic macroalgal module also improved the model's predictive capability in simulating dissolved oxygen in shallow ecosystems affected by benthic macroalgae. In terms of nutrient budget, the model estimated that benthic macroalgae retain approximately 10% of annual nonpoint source nitrogen inputs from the watershed based on the simulation of year 2004. This is lower than that contributed by benthic microalgae reported in other shallow coastal bays such as the Lynnhaven Bay. It is suspected that the restricted distribution of benthic macroalgae in the MVCBs limited their role from the whole bay perspective. With the incorporation of a benthic macroalgae module, the overall water quality model prediction capability is improved.


Assessing Genetic Variation Within And Among Native Populations And Hatchery Stocks Of Crassostrea Ariakensis Using Microsatellite Markers, Jie Xiao Jan 2009

Assessing Genetic Variation Within And Among Native Populations And Hatchery Stocks Of Crassostrea Ariakensis Using Microsatellite Markers, Jie Xiao

Dissertations, Theses, and Masters Projects

Assessing genetic variation within and among native populations and hatchery stocks of Crassostrea ariakensis using microsatellite markers In response to the dramatic decline of eastern oyster (Crassostrea virginica) populations in the Chesapeake Bay, introduction of the non-native Asian oyster Crassostrea ariakensis has been proposed. Currently several hatchery stocks of C. ariakensis, derived from a few wild populations along the coast of Japan and China, are being maintained in U.S. hatcheries in the Pacific northwest and on the east coast. In recent years, as the risks of the proposed introduction are being assessed, these hatchery animals have been widely used for …


Continental Shelf Sediment Transport And Depositional Processes On An Energetic, Active Margin: The Waiapu River Shelf, New Zealand, Yanxia Ma Jan 2009

Continental Shelf Sediment Transport And Depositional Processes On An Energetic, Active Margin: The Waiapu River Shelf, New Zealand, Yanxia Ma

Dissertations, Theses, and Masters Projects

The Waiapu River drains a small mountainous basin, characterized by steep terrain, heavy rainfall, and unconsolidated soft Tertiary mudstone and siltstone. These factors, combined with heavy deforestation over the past 100 years have created one of the world's highest sediment yields. Water discharge of the Waiapu River is very episodic over both inter- and intra-annual timescales, and almost all of the discharge is associated with floods brought by cyclonic storms. The Waiapu River drains an active margin that has a narrow shelf and steep slope. Marine conditions on the Waiapu continental shelf are very energetic, with strong waves as well …


Mortality Of Diamondback Terrapins In Blue Crab Traps: Population Changes And Conservation In Southeastern Virginia, Megan Ann Rook Jan 2009

Mortality Of Diamondback Terrapins In Blue Crab Traps: Population Changes And Conservation In Southeastern Virginia, Megan Ann Rook

Dissertations, Theses, and Masters Projects

No abstract provided.


Synergistic Effects Of Iron And Temperature On Antarctic Phytoplankton And Microzooplankton Assemblages, J. M. Rose, Y. Feng, Et Al, Walker O. Smith Jr., B. Sigist, S. Tozzi, Et Al Jan 2009

Synergistic Effects Of Iron And Temperature On Antarctic Phytoplankton And Microzooplankton Assemblages, J. M. Rose, Y. Feng, Et Al, Walker O. Smith Jr., B. Sigist, S. Tozzi, Et Al

VIMS Articles

Iron availability and temperature are important limiting factors for the biota in many areas of the world ocean, and both have been predicted to change in future climate scenarios. However, the impacts of combined changes in these two key factors on microbial trophic dynamics and nutrient cycling are unknown. We examined the relative effects of iron addition (+1 nM) and increased temperature (+4 degrees C) on plankton assemblages of the Ross Sea, Antarctica, a region characterized by annual algal blooms and an active microbial community. Increased iron and temperature individually had consistently significant but relatively minor positive effects on total …


Vims Response To Climate Change 2009, United Nations Environmental Programme : Responding To Climate Change In The Coastal Zone, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research Jan 2009

Vims Response To Climate Change 2009, United Nations Environmental Programme : Responding To Climate Change In The Coastal Zone, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research

Reports

VIMS Response to Climate Change 2009 United Nations Environmental Program Responding to climate change in the coastal zone


Marine Plankton Food Webs And Climate Change, Walker O. Smith Jr., Deborah K. Steinberg, Deborah A. Bronk, Kam W. Tang, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research Jan 2009

Marine Plankton Food Webs And Climate Change, Walker O. Smith Jr., Deborah K. Steinberg, Deborah A. Bronk, Kam W. Tang, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research

Reports

VIMS climate change white papers: Marine plankton food webs and climate change


Land-Coast Connections And Climate Change : Carbon Cycling In Chesapeake Bay And Its Watershed, Elizabeth A. Canuel, James E. Bauer, Virginia Institute Of Marine Science, Initiative For Coastal Climate Change Research Jan 2009

Land-Coast Connections And Climate Change : Carbon Cycling In Chesapeake Bay And Its Watershed, Elizabeth A. Canuel, James E. Bauer, Virginia Institute Of Marine Science, Initiative For Coastal Climate Change Research

Reports

VIMS climate change white paper: Land-coast connections and climate change : carbon cycling in Chesapeake Bay and its watershed


Vanishing And Emerging Ecosystems Of Coastal Virginia : Climate Change Impacts And Adaptation, Emmett J. Duffy, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research Jan 2009

Vanishing And Emerging Ecosystems Of Coastal Virginia : Climate Change Impacts And Adaptation, Emmett J. Duffy, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research

Reports

VIMS climate change white papers: Vanishing and emerging ecosystems of coastal Virginia : climate change impacts and adaptation


The Effects Of Sea Level Rise On Tidal Wetlands In The Lynnhaven River Watershed, Marcia Berman, Harry Berquist, Center For Coastal Resources Management, Virginia Institute Of Marine Science Jan 2009

The Effects Of Sea Level Rise On Tidal Wetlands In The Lynnhaven River Watershed, Marcia Berman, Harry Berquist, Center For Coastal Resources Management, Virginia Institute Of Marine Science

Reports

This study classified tidal wetlands for the Lynnhaven Watershed using remote sensing techniques and high resolution imagery from 2007. This updated delineation of wetlands, was used in conjunction with a simplistic geospatial elevation model to quantify the potential loss of wetlands under various sea level rise scenarios.The study revealed that using conservative estimates of sea level rise, nearly all wetlands would be lost by the year 2100. Projecting sea level rise into the future can be considered speculative, nevertheless such predictions are necessary to begin managing for and planning for climate change impacts. Evidence from this study suggests that upland …


Extreme Storm Events Increase The Risk For Chemical Contamination Of Coastal Waters, Michael A. Unger, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research Jan 2009

Extreme Storm Events Increase The Risk For Chemical Contamination Of Coastal Waters, Michael A. Unger, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research

Reports

Sea-level rise and an increase in the severity of coastal storms are probable outcomes for the Chesapeake Bay due to global climate change. A consequent ecological and economic risk for tidewater Virginia and other low-lying coastal zones is the contamination of coastal waters by industrial and agricultural chemicals released by accidental spills during severe storm events. . . .


Planning For Sea Level Rise And Coastal Flooding, John D. Boon, Harry V. Wang, Jian Shen, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research Jan 2009

Planning For Sea Level Rise And Coastal Flooding, John D. Boon, Harry V. Wang, Jian Shen, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research

Reports

VIMS climate change white papers: Planning for sea level rise and coastal flooding


Observing And Modeling Global Warming Impacts In Virginia, Mark R. Patterson, Mark Brush, Marjorie A.M. Friedrichs, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research Jan 2009

Observing And Modeling Global Warming Impacts In Virginia, Mark R. Patterson, Mark Brush, Marjorie A.M. Friedrichs, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research

Reports

VIMS climate change white paper: Observing and modeling global warming impacts in Virginia


Workshop On Environmental Research Needs In Support Of Potential Virginia Offshore Oil And Gas Activities, Robert J. Diaz, Richard Brill, Linda C. Schaffner, Kenneth W. Able, Larry Atkinson, Diane Austin, Scott Kraus, Douglas Lipton, United States. Minerals Management Service Jan 2009

Workshop On Environmental Research Needs In Support Of Potential Virginia Offshore Oil And Gas Activities, Robert J. Diaz, Richard Brill, Linda C. Schaffner, Kenneth W. Able, Larry Atkinson, Diane Austin, Scott Kraus, Douglas Lipton, United States. Minerals Management Service

Reports

The MMS, a bureau within the Department of the Interior, sponsored a workshop on the environmental research needs in support of potential Virginia offshore oil and gas activities 3 and 4 December 2008, in Williamsburg, Virginia. The focus of the workshop was to assess the existing scientific knowledgebase along the Virginia Coast and the information gaps that need to 2 be addressed should a lease sale for oil and gas activities be held for the Virginia outer continental shelf. This report summarizes the outcome of the workshop.


Climate Change And Submerged Aquatic Vegetation In Virginia, Kenneth A. Moore, Robert J. Orth, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research Jan 2009

Climate Change And Submerged Aquatic Vegetation In Virginia, Kenneth A. Moore, Robert J. Orth, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Research

Reports

VIMS climate change white paper: Climate change and submerged aquatic vegetation in Virginia


Climate Change And Aquatic Animal Health In Virginia : Effects And Responses, Wolfgang K. Vogelbein, Eugene M. Burreson, Ryan Carnegie, Jeffrey D. Shields, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Reseach Jan 2009

Climate Change And Aquatic Animal Health In Virginia : Effects And Responses, Wolfgang K. Vogelbein, Eugene M. Burreson, Ryan Carnegie, Jeffrey D. Shields, Virginia Institute Of Marine Science. Initiative For Coastal Climate Change Reseach

Reports

Climate change, with concomitant increases in sea level, temperature, greenhouse gases and alterations in precipitation, is a major environmental challenge for the future management of Virginia’s valuable marine resources.


A Numerical Modeling Study On Barotropic And Baroclinic Responses Of The Chesapeake Bay To Hurricane Events, Kyoung-Ho Cho Jan 2009

A Numerical Modeling Study On Barotropic And Baroclinic Responses Of The Chesapeake Bay To Hurricane Events, Kyoung-Ho Cho

Dissertations, Theses, and Masters Projects

The barotropic and baroclinic responses of the Chesapeake Bay to forcings from two hurricanes were investigated by using unstructured-grid three-dimensional hydrodynamic models. The model domain includes Chesapeake Bay proper, the tributaries, and its extended continental shelf in the mid-Atlantic Bight. Two hurricanes were studied: Hurricane Floyd of September, 1999 and Hurricane Isabel of September, 2003, both of which made landfall within 100 km of the Chesapeake Bay mouth. Hurricane Floyd in 1999 passed through the entrance of the Bay from southwest to northeast along the coastlines of Virginia as a Category 1 storm, whereas Hurricane Isabel in 2003 made landfall …