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Spatial, Temporal, And Human-Induced Variations In Suspended Sediment Concentration In The Surface Waters Of The Yangtze Estuary And Adjacent Coastal Areas, P Li, Sl Yang, Jd Milliman, Kh Xu, Wh Qin, Et Al.
Spatial, Temporal, And Human-Induced Variations In Suspended Sediment Concentration In The Surface Waters Of The Yangtze Estuary And Adjacent Coastal Areas, P Li, Sl Yang, Jd Milliman, Kh Xu, Wh Qin, Et Al.
VIMS Articles
To delineate temporal and spatial variations in suspended sediment concentration (SSC) in the Yangtze (Changjiang) Estuary and adjacent coastal waters, surface-water samples were taken twice daily from 10 stations over periods ranging from 2 to 12 years (total number of samples > 28,000). Synoptic measurements in 2009 showed an increase in surface SSC from 0.058 g/l in the upper sections of the estuary to similar to 0.6 g/l at the Yangtze River turbidity maximum at the river mouth, decreasing seaward to 0.057 g/l. Annual periodicities reflect variations in the Yangtze discharge, which affect the horizontal distribution and transport of SSC, and …
A Modeling Study On The Response Of Chesapeake Bay To Hurricane Events Of Floyd And Isabel, Kh Cho, Harry V. Wang, Jian Shen, A Valle-Levinson, Yc Teng
A Modeling Study On The Response Of Chesapeake Bay To Hurricane Events Of Floyd And Isabel, Kh Cho, Harry V. Wang, Jian Shen, A Valle-Levinson, Yc Teng
VIMS Articles
The response of Chesapeake Bay to forcing from two hurricanes is investigated using an unstructured-grid three-dimensional hydrodynamic model SELFE. The model domain includes Chesapeake Bay, its tributaries, and the extended continental shelf in the mid-Atlantic Bight. The hurricanes chosen for the study are Hurricane Floyd (1999) and Hurricane Isabel (2003), both of which made landfall within 100 km of the mouth of the Bay. The model results agree reasonably well with field observations of water level, velocity, and salinity. From the Bay's water level response to the hurricanes, it was found that the storm surge in the Bay has two …
Relative Role Of Wind Forcing And Riverine Nutrient Input On The Extent Of Hypoxia In The Northern Gulf Of Mexico, Y Feng, Sf Dimarco, Ga Jackson
Relative Role Of Wind Forcing And Riverine Nutrient Input On The Extent Of Hypoxia In The Northern Gulf Of Mexico, Y Feng, Sf Dimarco, Ga Jackson
VIMS Articles
Seasonal hypoxia of the northern Gulf of Mexico has been observed for more than 25 years. It is generally accepted that the variation in the areal extent of hypoxia is determined by changes in nutrient addition from the Mississippi River. In this study, we investigate the statistical relation between the hypoxic area and a new variable, the duration of west wind, using the available measurements for the period 1985-2010. Special consideration was paid to the 1993-2010 period, a time when a large shift in the seasonal hypoxia pattern has been reported. When excluding the years in which hurricanes directly impacted …
Assimilatory Nitrate Utilization By Bacteria On The West Florida Shelf As Determined By Stable Isotope Probing And Functional Microarray Analysis, B Wawrik, Wb Boling, Jd Van Nostrand, Jp Xie, Jz Zhou, Da Bronk
Assimilatory Nitrate Utilization By Bacteria On The West Florida Shelf As Determined By Stable Isotope Probing And Functional Microarray Analysis, B Wawrik, Wb Boling, Jd Van Nostrand, Jp Xie, Jz Zhou, Da Bronk
VIMS Articles
Dissolved inorganic nitrogen (DIN) uptake by marine heterotrophic bacteria has important implications for the global nitrogen (N) and carbon (C) cycles. Bacterial nitrate utilization is more prevalent in the marine environment than traditionally thought, but the taxonomic identity of bacteria that utilize nitrate is difficult to determine using traditional methodologies. 15N-based DNA stable isotope probing was applied to document direct use of nitrate by heterotrophic bacteria on the West Florida Shelf. Seawater was incubated in the presence of 2 mu M 15N ammonium or 15N nitrate. DNA was extracted, fractionated via CsCl ultracentrifugation, and each fraction was analyzed by terminal …