Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Physical Sciences Peer-Reviewed Articles (7)
- Biological Sciences Peer-Reviewed Articles (5)
- Antarctic · Global warming · Fe input · Phytoplankton community · Diatom · Phaeocystis · Pseudo-nitzschia (1)
- Aquatic Health Sciences Peer-Reviewed Articles (1)
- Arctic Ocean; biochemistry; concentration; data processing; digital simulation; ice; Mid-Arctic Ocean Ridge (1)
-
- Biological pump (1)
- Chesapeake Bay (1)
- Ecosystem restoration (1)
- Estuarine dynamics; numerical model; transport time; James River (1)
- Food quality (1)
- Habitat connectivity (1)
- Historical ecology (1)
- Land-use change (1)
- Ocean carbon cycling (1)
- Primary production (1)
- Sacramento–San Joaquin Delta (1)
- Salt marsh (1)
- Satellite remote sensing (1)
- Satellite remote sensing; field campain; science plan; ocean carbon cycling; biological pump (1)
- Summer hypoxia/anoxia; wind speeds and directions; prolonged unidirectional wind (1)
- Transport modeling; inverse modeling; bacterial loading estimation; traditional watershed modeling (1)
Articles 1 - 13 of 13
Full-Text Articles in Physical Sciences and Mathematics
Net Primary Productivity Estimates And Environmental Variables In The Arctic Ocean; An Assessment Of Coupled Physical-Biogeochemical Models, Younjoo J. Lee, Patrica A. Matrai, Marjorie A.M. Friedrichs, Et Al
Net Primary Productivity Estimates And Environmental Variables In The Arctic Ocean; An Assessment Of Coupled Physical-Biogeochemical Models, Younjoo J. Lee, Patrica A. Matrai, Marjorie A.M. Friedrichs, Et Al
VIMS Articles
The relative skill of 21 regional and global biogeochemical models was assessed in terms of how well the models reproduced observed net primary productivity (NPP) and environmental variables such as nitrate concentration (NO (sub 3) ), mixed layer depth (MLD), euphotic layer depth (Z (sub eu) ), and sea ice concentration, by comparing results against a newly updated, quality-controlled in situ NPP database for the Arctic Ocean (1959-2011). The models broadly captured the spatial features of integrated NPP (iNPP) on a pan-Arctic scale. Most models underestimated iNPP by varying degrees in spite of overestimating surface NO (sub 3) , MLD, …
Regression Or Significance Tests: What Other Choice Is There?—An Academic Perspective, Michael C. Newman, Marcos Krull
Regression Or Significance Tests: What Other Choice Is There?—An Academic Perspective, Michael C. Newman, Marcos Krull
VIMS Articles
Both the no-observed-effect concentration and its null hypothesis significance testing foundation have drawn steady criticism since their inceptions [1–5]. Many in our field reasonably advocate regression to avoid conventional null hypothesis significance testing shortcomings; however, regression is compromised under commonly encountered conditions (Green, present Perspective’s Challenge). As the debate to favor null hypothesis significance testing or regression methods continues into the 21st century, a sensible strategy might be to take a moment to ask, Are there now other choices? Our goal is to sketch out 1 such choice.
Sea Level Driven Marsh Expansion In A Coupled Model Of Marsh Erosion And Migration, Matthew L. Kirwan, Dc Walters, W. G. Reay, Ja Carr
Sea Level Driven Marsh Expansion In A Coupled Model Of Marsh Erosion And Migration, Matthew L. Kirwan, Dc Walters, W. G. Reay, Ja Carr
VIMS Articles
Coastal wetlands are among the most valuable ecosystems on Earth, where ecosystem services such as flood protection depend nonlinearly on wetland size and are threatened by sea level rise and coastal development. Here we propose a simple model of marsh migration into adjacent uplands and couple it with existing models of seaward edge erosion and vertical soil accretion to explore how ecosystem connectivity influences marsh size and response to sea level rise. We find that marsh loss is nearly inevitable where topographic and anthropogenic barriers limit migration. Where unconstrained by barriers, however, rates of marsh migration are much more sensitive …
Nitrogen Sources And Net Growth Efficiency Of Zooplankton In Three Amazon River Plume Food Webs, Natalie Loick-Wilde, Sarah C. Weber, Brandon J. Condon, Douglas G. Capone, Victoria J. Coles, Patricia M. Medeiros, Deborah K. Steinberg, Joseph P. Montoya
Nitrogen Sources And Net Growth Efficiency Of Zooplankton In Three Amazon River Plume Food Webs, Natalie Loick-Wilde, Sarah C. Weber, Brandon J. Condon, Douglas G. Capone, Victoria J. Coles, Patricia M. Medeiros, Deborah K. Steinberg, Joseph P. Montoya
VIMS Articles
The plasticity of nitrogen specific net growth efficiency (NGE) in marine mesozooplankton is currently unresolved, with discordant lines of evidence suggesting that NGE is constant, or that it varies with nitrogen source, food availability, and food quality in marine ecosystems. Specifically, the fate of nitrogen from nitrogen fixation is poorly known. We use 15N : 14N ratios in plankton in combination with hydrological data, nutrient profiles, and nitrogen fixation rate measurements to investigate the relationship between new nitrogen sources and the nitrogen specific NGE in three plankton communities along the outer Amazon River plume. The NGE of small …
Influence Of Reservoir Infill On Coastal Deep Water Hypoxia, Lewis C. Linker, Richard A. Batiuk, Carl F. Cerco, Gary W. Shenk, Richard Tian, Ping Wang, Guido Yactayo
Influence Of Reservoir Infill On Coastal Deep Water Hypoxia, Lewis C. Linker, Richard A. Batiuk, Carl F. Cerco, Gary W. Shenk, Richard Tian, Ping Wang, Guido Yactayo
VIMS Articles
Ecological restoration of the Chesapeake through the Chesapeake Bay total maximum daily load (TMDL) requires the reduction of nitrogen, phosphorus, and sediment loads in the Chesapeake watershed because of the tidal water quality impairments and damage to living resources they cause. Within the Chesapeake watershed, the Conowingo Reservoir has been filling in with sediment for almost a century and is now in a state of near‐full capacity called dynamic equilibrium. The development of the Chesapeake TMDL in 2010 was with the assumption that the Conowingo Reservoir was still effectively trapping sediment and nutrients. This is now known not to …
Primary Production In The Delta: Then And Now, James E. Cloern, April Robinson, (...), Elizabeth A. Canuel, Et Al
Primary Production In The Delta: Then And Now, James E. Cloern, April Robinson, (...), Elizabeth A. Canuel, Et Al
VIMS Articles
To evaluate the role of restoration in the recovery of the Delta ecosystem, we need to have clear targets and performance measures that directly assess ecosystem function. Primary production is a crucial ecosystem process, which directly limits the quality and quantity of food available for secondary consumers such as invertebrates and fish. The Delta has a low rate of primary production, but it is unclear whether this was always the case. Recent analyses from the Historical Ecology Team and Delta Landscapes Project provide quantitative comparisons of the areal extent of 14 habitat types in the modern Delta versus the historical …
Combining Inverse And Transport Modeling To Estimate Bacterial Loading And Transport In A Tidal Embayment, Mac Sisson, Jian Shen, Anne Schlegel
Combining Inverse And Transport Modeling To Estimate Bacterial Loading And Transport In A Tidal Embayment, Mac Sisson, Jian Shen, Anne Schlegel
VIMS Articles
Poquoson River is a tidal coastal embayment located along the Western Shore of the Chesapeake Bay about 4 km south of the York River mouth in the City of Poquoson and in York County, Virginia. Its drainage area has diversified land uses, including high densities of residence, agricultural, salt marsh land uses, as well as a National Wildlife Refuge. This embayment experiences elevated bacterial concentration due to excess bacterial inputs from storm water runoff, nonpoint sources, and wash off from marshes due to tide and wind-induced set-up and set-down. Bacteria can also grow in the marsh and small tributaries. It …
Why Biodiversity Is Important To The Functioning Of Real-World Ecosystems, Da Siegel, Ko Buessler, Et Al, Deborah K. Steinberg
Why Biodiversity Is Important To The Functioning Of Real-World Ecosystems, Da Siegel, Ko Buessler, Et Al, Deborah K. Steinberg
VIMS Articles
Ocean ecosystems play a critical role in the Earth's carbon cycle and the quantification of their impacts for both present conditions and for predictions into the future remains one of the greatest challenges in oceanography. The goal of the EXport Processes in the Ocean from Remote Sensing (EXPORTS) Science Plan is to develop a predictive understanding of the export and fate of global ocean net primary production (NPP) and its implications for present and future climates. The achievement of this goal requires a quantification of the mechanisms that control the export of carbon from the euphotic zone as well as …
Development Of The Hydrodynamic Model For Long-Term Simulation Of Water Quality Processes Of The Tidal James River, Virginia, Jian Shen, Ya Wang, Mac Sisson
Development Of The Hydrodynamic Model For Long-Term Simulation Of Water Quality Processes Of The Tidal James River, Virginia, Jian Shen, Ya Wang, Mac Sisson
VIMS Articles
Harmful algal blooms (HABs) have frequently occurred in the James River. The State has convened a Scientific Advisory Panel (SAP) to review the James River chlorophyll-a standards. The SAP will conduct a scientific study to review the basis for setting the chlorophyll-a standards. To support the SAP study of chlorophyll-a standards, the State of Virginia has decided to develop a numerical modeling system that is capable of simulating phytoplankton and HABs. The modeling system includes a watershed model, a three-dimensional hydrodynamic model and water quality models. The focus of this study will be on the development and verification of the …
A Comparative Study Of Iron And Temperature Interactive Effects On Diatoms And Phaeocystis Antarctica From The Ross Sea, Antarctica, Zhi Zhu, Kai Xu, Feixue Fu, Jenna L. Spackeen, Deborah A. Bronk, David A. Hutchins
A Comparative Study Of Iron And Temperature Interactive Effects On Diatoms And Phaeocystis Antarctica From The Ross Sea, Antarctica, Zhi Zhu, Kai Xu, Feixue Fu, Jenna L. Spackeen, Deborah A. Bronk, David A. Hutchins
VIMS Articles
In the future, temperature and iron availability are predicted to change in the coastal polynyas of Antarctica, which are the most biologically productive regions of the Southern Ocean. We examined the individual and combined effects of iron addition (+500 nM) and temperature increase (4°C) on Phaeocystis antarctica and several dominant diatom species isolated from the McMurdo Sound sector of the Ross Sea. Iron addition increased growth, carbon fixation, iron uptake rates, cellular carbon quota, and cell size of almost all tested species, while temperature increase only affected certain species. Concurrent increases in temperature and iron synergistically stimulated the growth rates …
Prediction Of The Export And Fate Of Global Ocean Net Primary Production: The Exports Science Plan, Da Siegel, Ko Buesseler, Et Al, Deborah K. Steinberg
Prediction Of The Export And Fate Of Global Ocean Net Primary Production: The Exports Science Plan, Da Siegel, Ko Buesseler, Et Al, Deborah K. Steinberg
VIMS Articles
Ocean ecosystems play a critical role in the Earth's carbon cycle and the quantification of their impacts for both present conditions and for predictions into the future remains one of the greatest challenges in oceanography. The goal of the EXport Processes in the Ocean from Remote Sensing (EXPORTS) Science Plan is to develop a predictive understanding of the export and fate of global ocean net primary production (NPP) and its implications for present and future climates. The achievement of this goal requires a quantification of the mechanisms that control the export of carbon from the euphotic zone as well as …
A Carbon Budget For The Amundsen Sea Polynya, Antarctica: Estimating Net Community Production And Export In A Highly Productive Polar Ecosystem, Pl Yager, Rm Sherrell, Et Al, Rachel E. Sipler, Et Al
A Carbon Budget For The Amundsen Sea Polynya, Antarctica: Estimating Net Community Production And Export In A Highly Productive Polar Ecosystem, Pl Yager, Rm Sherrell, Et Al, Rachel E. Sipler, Et Al
VIMS Articles
Polynyas, or recurring areas of seasonally open water surrounded by sea ice, are foci for energy and material transfer between the atmosphere and the polar ocean. They are also climate sensitive, with both sea ice extent and glacial melt influencing their productivity. The Amundsen Sea Polynya (ASP) is the greenest polynya in the Southern Ocean, with summertime chlorophyll a concentrations exceeding 20 μg L−1. During the Amundsen Sea Polynya International Research Expedition (ASPIRE) in austral summer 2010–11, we aimed to determine the fate of this high algal productivity. We collected water column profiles for total dissolved inorganic carbon (DIC) and …
Influence Of Wind Strength And Duration On Relative Hypoxia Reductions By Opposite Wind Directions In An Estuary With An Asymmetric Channel, Ping Wang, Harry V. Wang, Lewis Linker, Kyle Hinson
Influence Of Wind Strength And Duration On Relative Hypoxia Reductions By Opposite Wind Directions In An Estuary With An Asymmetric Channel, Ping Wang, Harry V. Wang, Lewis Linker, Kyle Hinson
VIMS Articles
Computer model experiments are applied to analyze hypoxia reductions for opposing wind directions under various speeds and durations in the north–south oriented, two-layer-circulated Chesapeake estuary. Wind’s role in destratification is the main mechanism in short-term reduction of hypoxia. Hypoxia can also be reduced by wind-enhanced estuarine circulation associated with winds that have down-estuary straining components that promote bottom-returned oxygen-rich seawater intrusion. The up-bay-ward along-channel component of straining by the southerly or easterly wind induces greater destratification than the down-bay-ward straining by the opposite wind direction, i.e., northerly or westerly winds. While under the modulation of the west-skewed asymmetric cross-channel bathymetry …