Distributional Differences and Population Similarities for Two Deep-Sea Crabs (Family Geryonidae) in the Northeastern Gulf of Mexico

1990 ◽  
Vol 47 (11) ◽  
pp. 2112-2122 ◽  
Author(s):  
F. D. Lockhart ◽  
W. J. Lindberg ◽  
N. J. Blake ◽  
R. B. Erdman ◽  
H. M. Perry ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Relative Abundance ◽  
Deep Sea ◽  
Seasonal Patterns ◽  
Florida Current ◽  
Loop Current ◽  
Male And Female ◽  
Northeastern Gulf Of Mexico ◽  
Current Circulation ◽  
Depth Zonation

For golden crab, Chaceon fenneri, and red crab, Chaceon quinquedens, numbers per trap, sex, and crab size were tested for broad bathymetric, geographic, and seasonal patterns on the upper continental slope, northeastern Gulf of Mexico. Red crab occupied only the deepest of three sampled depths (i.e. 677 m vs. 494 and 311 m) while golden crab predominated at the upper two. Golden crab occurred adjacent to peninsular Florida, but not along the northern Gulf slope, while red crab occurred across the geographic arc sampled. Relative abundance increased southward for golden crab and northwestward for red crab, while the proportion of females increased counter-clockwise within the sampled range of each species. Golden crab exhibited a Chaceon-typical bathymetric pattern of partial sex segregation and size inversely related to depth, but male and female bathymetric patterns shifted seasonally with lags between geographic areas. Interspecific competition cannot explain the species depth zonation, while geographic and seasonal patterns may relate to Loop Current–Florida Current circulation.

The influence of Gulf of Mexico Loop Current intrusion on the transport of the Florida Current

2010 ◽  
Vol 60 (5) ◽  
pp. 1075-1084 ◽  
Author(s):  
Yuehua Lin ◽  
Richard J. Greatbatch ◽  
Jinyu Sheng
Keyword(s):  
Gulf Of Mexico ◽  
Florida Current ◽  
Loop Current

scholarly journals SEASONAL VARIABILITY OF LIGHT ABSORPTION COEFFICIENT OF SURFACE WATER

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Bisman Nababan ◽  
Denny A. Wiguna ◽  
Risti E. Arhatin
Keyword(s):  
Gulf Of Mexico ◽  
Absorption Coefficient ◽  
Loop Current ◽  
Surface Absorption ◽  
Average Value ◽  
Run Off ◽  
Significant Difference ◽  
Coefficient Measurement ◽  
Northeastern Gulf Of Mexico ◽  
Offshore Region

Absorption coefficient measurement can be used in estimating water quality, optical characteristic of water column, and marine bio-optical models. The purposes of this research were to determine values and variability of sea surface absorption coefficient in the northeastern Gulf of Mexico (NEGOM) based on various seasons. The data were collected in spring, summer, and fall seasons in 1999-2000 with AC-9 instrument. The spatial distribution of absorption coefficient showed that relatively high values were generally found along the run off Missisippi, Mobile, Chochawati, Escambia, Apalachicola, and Suwannee rivers, as well as Tampa Bay. Meanwhile, relatively low values were found in offshore region. This pattern followed the distribution pattern of chlorophyll and CDOM. Based on the local region comparison of spectral average value of absorption coefficient, we found a significant difference (α = 95%) among regions with the highest value in the run off of the Mississippi and Mobile rivers, and the lowest value in the offshore region. Comparison of spectral average value of absorption coefficient among seasons at the three primary wavelengths (blue=440 nm, green=510 nm, and red=676 nm) also showed a significant difference (α = 95%) with the highest value during the summer 1999 (Su-99) and the lowest value during the spring of 2000 (Sp-00). Absorption coefficient values were influenced by oceanographic factors that varied in every season such as wind, surface currents, upwelling, the location and speed of the Loop Current, and the river discharge of fresh water into the NEGOM.Keywords: absorption coefficient, seasons, chlorophyll, CDOM, northeastern Gulf of Mexico

scholarly journals Transports through the Straits of Florida

2005 ◽  
Vol 35 (3) ◽  
pp. 308-322 ◽  
Author(s):  
Peter Hamilton ◽  
Jimmy C. Larsen ◽  
Kevin D. Leaman ◽  
Thomas N. Lee ◽  
Evans Waddell
Keyword(s):  
Gulf Of Mexico ◽  
North Atlantic Ocean ◽  
Florida Current ◽  
Loop Current ◽  
Straits Of Florida ◽  
Key West ◽  
The North ◽  
Side Channels ◽  
Yucatan Channel ◽  
Accurate Indicator

Abstract Transports were calculated for four sections of the Florida Current from Key West to Jupiter, Florida, using a moored current-meter array and voltages from cross-channel telephone cables at the western and northern ends of the Straits of Florida. In addition, moored arrays were used to estimate transport through the Northwest Providence, Santaren, and Old Bahama Channels that connect the Florida Current to the southwestern part of the North Atlantic Ocean. Transport measurements were obtained for an 11-month period from December 1990 to November 1991. Mean transports of ∼25 Sv (1 Sv ≡ 106 m3 s−1) for the flow across the western ends of the straits, which agree quite well with recent estimates of 23.8 ± 1 Sv entering the Gulf of Mexico through the Yucatan Channel, were obtained from both the Key West to Havana cable and the moored array. This estimate is about 5 Sv less than the generally accepted transport through the northern end of the straits at 27°N. This difference was partially accounted for by inflows through the side channels with more transport from the Old Bahama than the Northwest Providence Channel. The variability in the southern part of the straits was larger than at 27°N and included large diversions of the Florida Current south of the Cay Sal Bank and into the Santaren Channel that were caused by large meanders of the flow. The variability of transport in the side channels contributed to the variability of the Florida Current and reduces the correlations of the transports at the ends of the straits. Therefore, the well-measured transport at 27°N is not an accurate indicator of the transport of the Loop Current out of the Gulf of Mexico.

Nonlocal impacts of the Loop Current on cross-slope near-bottom flow in the northeastern Gulf of Mexico

2015 ◽  
Vol 42 (8) ◽  
pp. 2926-2933 ◽  
Author(s):  
Thanh-Tam Nguyen ◽  
Steven L. Morey ◽  
Dmitry S. Dukhovskoy ◽  
Eric P. Chassignet
Keyword(s):  
Gulf Of Mexico ◽  
Loop Current ◽  
Northeastern Gulf Of Mexico

Subinertial Slope-Trapped Waves in the Northeastern Gulf of Mexico

2009 ◽  
Vol 39 (6) ◽  
pp. 1475-1485 ◽  
Author(s):  
Z. R. Hallock ◽  
W. J. Teague ◽  
E. Jarosz
Keyword(s):  
Gulf Of Mexico ◽  
Current Velocity ◽  
Kelvin Waves ◽  
Loop Current ◽  
Mobile Bay ◽  
The West ◽  
Direct Forcing ◽  
Northeastern Gulf Of Mexico ◽  
The Waves ◽  
Acoustic Doppler Current Profilers

Abstract Current velocity from moored arrays of acoustic Doppler current profilers (ADCPs) deployed on the outer shelf and slope, south of Mobile Bay in the northeastern Gulf of Mexico, shows evidence of alongslope, generally westward-propagating subinertial baroclinic Kelvin waves with periods of about 16 and 21 days, amplitudes of 5–10 cm s−1, and wavelengths of about 500 km. The observed waves were highly coherent over the slope between about 200 and 500 m and accounted for a significant amount of the current variability below 200 m. The source of the waves could be attributed to effects of the Loop Current on the west Florida slope but is more likely due to direct forcing by Loop Current–generated eddies impacting the experimental area.

scholarly journals SEASONAL VARIABILITY OF LIGHT ABSORPTION COEFFICIENT OF SURFACE WATER

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Bisman Nababan ◽  
Denny A. Wiguna ◽  
Risti E. Arhatin
Keyword(s):  
Gulf Of Mexico ◽  
Absorption Coefficient ◽  
Loop Current ◽  
Surface Absorption ◽  
Average Value ◽  
Light Absorption Coefficient ◽  
Run Off ◽  
Significant Difference ◽  
Northeastern Gulf Of Mexico ◽  
Offshore Region

<p><em>Absorption coefficient </em><em>measurement can </em><em>be </em><em>use</em><em>d</em><em> in</em><em> </em><em>estimat</em><em>ing</em><em> water quality, </em><em>op</em><em>t</em><em>ical </em><em>characteristic of water column, and </em><em>marine </em><em>bio-optical models. The purposes of this research were to determine values and variability of sea surface absorption coefficient in the northeastern Gulf of Mexico (NEGOM) based on various seasons. The data were collected </em><em>in</em><em> spring, summer, and fall seasons in 1999-2000 with AC-9 instrument. The spatial distribution of absorption coefficient showed that relatively high values </em><em>were </em><em>generally found along the run off Missisippi, Mobile, Chochawati, Escambia, Apalachicola, and Suwannee rivers, as well as Tampa Bay. Meanwhile, relatively low values were found in offshore region. </em><em>This pattern followed the</em><em> distribution pattern of chlorophyll and CDOM. Based on the local region comparison of spectral average value of absorption coefficient, we found a significant difference (α = 95%) among regions with the highest value in the run off of the Mississippi and Mobile rivers, and the lowest value in the offshore region. Comparison of spectral average value of absorption coefficient among seasons at the three primary wavelengths (blue=440 nm, green=510 nm, and red=676 nm) also showed a significant difference (α = 95%) with the highest value during the summer 1999 (Su-99) and the lowest value during the spring of 2000 (Sp-00). Absorption coefficient values were influenced by oceanographic factors that varied in every season such as wind, surface currents, upwelling, the location and speed of the Loop Current, and the river discharge of fresh water into the NEGOM.</em></p><strong><em>Keywords:</em></strong><em> absorption coefficient, seasons, chlorophyll, CDOM, northeastern Gulf of Mexico</em>

Turbulence Measurements in a Gulf of Mexico Warm-Core Ring

2007 ◽  
Author(s):  
Thomas M. Mitchell ◽  
Rolf G. Lueck ◽  
Michael J. Vogel ◽  
Robert E. Raye ◽  
George Z. Forristall
Keyword(s):  
Gulf Of Mexico ◽  
Gulf Stream ◽  
Noise Level ◽  
Acoustic Doppler Current Profiler ◽  
Florida Current ◽  
Depth Range ◽  
Loop Current ◽  
Environmental Signals ◽  
Warm Core ◽  
Warm Core Ring

Oceanographic measurements were made in a Loop Current Eddy in the Gulf of Mexico to characterize the turbulence associated with these eddies. Measurements were made within the eddy, and across the strong frontal boundary delineating the eddy from the surrounding waters. The survey was conducted August 23–30, 2003, from the R/V Pelican. The towed vehicle, the TOMI, was equipped with a special 300 kHz acoustic Doppler current profiler (Medusa ADCP) that had its four beams directed fore, port, starboard and down. The along-beam velocities resolved structures with wavelengths of 4 to 60 m. The vehicle also carried shear probes for measuring velocity fluctuations in the dissipation range (0.5 to 100 cycles per meter), and other environmental sensors for measuring temperature, salinity, depth and vehicle orientation. Ship equipment included a 75 and 300 kHz hull-mounted ADCP, CTD, and meteorological sensors. Tows were conducted at 25, 50, 100 and 150 m depths around the northern edge of the Loop Eddy in currents of up to 1.7 m s−1. Turbulence was detected with the shear probes, but mostly in the 130–150 m depth range around the local salinity maxima. The level of turbulence is weak and it is distributed intermittently in both space and time. The most energetic events of turbulence have eddy scales of at most 4 meters and velocity scales of only 1 cm s−1. The typical and average values are more than 10 times smaller. The concurrent measurements of velocity with the Medusa ADCP did not reveal any signals significantly larger than the noise level of this instrumentation, namely 2 cm s−1. Overlap averaging of the forward directed beam reduced the noise level to 0.5 cm s−1 but still failed to reveal real environmental signals. This “null-result” is consistent with the simultaneous measurements taken with the shear probe. These low levels of turbulence are also consistent with reports of measurements in the Gulf Stream, the Florida Current, and a Gulf Stream Warm-Core Ring. Funding was provided by the DeepStar oil industry research consortium. Complete details of the program are provided in Reference [6].

Characterizing the Deep Sea Benthic Foraminifera Impact and Response to the Deepwater Horizon Blowout in the Northeastern Gulf of Mexico

2014 ◽  
Vol 2014 (1) ◽  
pp. 299744 ◽  
Author(s):  
P.T. Schwing ◽  
I.C. Romero ◽  
G.R. Brooks ◽  
D.W. Hastings ◽  
R.A. Larson ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Benthic Foraminifera ◽  
Deep Sea ◽  
Accumulation Rate ◽  
Sediment Toxicity ◽  
Deepwater Horizon ◽  
Community Response ◽  
Specific Response ◽  
Long Term Effects ◽  
Northeastern Gulf Of Mexico

Sediment cores were collected from the northeastern Gulf of Mexico to assess changes in deep-sea benthic foraminifera related to the Deepwater Horizon blowout, which occurred from April to July of 2010. Short-lived radioisotope geochronology (210Pb and 234Th) and organic geochemical toxicity assessments were also made to relate changes in sediment accumulation rate and sediment toxicity levels with benthic foraminifera. Cores collected in December 2010 indicate a community-wide event characterized by a decrease in concentration and benthic foraminifera mass accumulation rate (BFMAR) in the surface 10 mm relative to the down-core mean in all benthic foraminifera. Cores collected in February 2011 document a site-specific response and possible community recovery. In the site closer to the wellhead (45 NM, NE) there is evidence of a recovery in the benthic foraminifera community in both the concentrations and BFMAR. However, the site farther afield (60 NM, NE) records a continued depletion event characterized by a further decrease in benthic foraminifera concentrations and BFMAR down to zero values. Among the many questions to address, [(1) the mechanism for the decline (anoxia, hydrocarbon toxicity, etc.), (2) the trophic implications and (3) the spatial extent of the decline] perhaps the most important is the determination of recovery time for the system. Further analysis of benthic foraminifera abundance from cores collected after February 2011 (September 2011 and August 2012) will address the pressing issue of how long it will take for the benthic communities to recover from an event such as the Deepwater Horizon blowout. The records of benthic foraminifera abundance coupled with short-lived radionuclide geochronology and organic geochemical toxicity has shown to be effective in documenting and quantifying the benthic community response and will continue to be a valuable tool in determining the long-term effects of the Deepwater Horizon oil blowout on a larger spatial scale.

scholarly journals From the deep ocean to the coasts and estuaries through the shelf: linking coastal response to a deep blow-out

2021 ◽  
Vol 2021 (1) ◽  
pp. 685087
Author(s):  
Vassiliki Kourafalou ◽  
Dubravko Justic ◽  
Yannis Androulidakis ◽  
Annalisa Bracco
Keyword(s):  
Gulf Of Mexico ◽  
Current System ◽  
Deep Ocean ◽  
Florida Keys ◽  
Transport Processes ◽  
Physical Factors ◽  
Florida Current ◽  
Loop Current ◽  
Deep Basin ◽  
New Findings

ABSTRACT # 685087 As a marginal sea connected to neighboring basins through straits, the Gulf of Mexico (GoM) is dynamically and topographically complex. Physical processes are strongly influenced by the interaction of circulation in the GoM deep basin interior and in the surrounding shelf areas of diverse morphologies that include deltas, estuaries, barrier islands and marshes. This was particularly evident during the 2010 Deepwater Horizon (DwH) incident, a deep blow-out close to the Northern GoM shelves, over an area strongly affected by the brackish river plume originated from the Mississippi River Delta. The specific physical conditions are revisited, to illustrate the synergy between the evolution of the Loop Current – Florida Current system and the rapidly changing shelf and coastal currents under the influence of river runoff and winds. Each of these physical factors had been studied prior to the DwH incident, but their combined effects on hydrocarbon pathways were not known. Examples are given on what has been learned through research under the Gulf of Mexico Research Initiative (GoMRI) in the last 10 years. The focus is on transport processes in the GoM along the ocean continuum from the deep basin interior to the coastal and wetland areas, and their relevance for oil transport and fate. Post-DwH studies have advanced regarding methodologies and tools. These include multi-platform observations and data analyses, in tandem with high-resolution, data assimilative models for past simulations and predictions. Important new findings include the connectivity between remote coastal regions, as deep oceanic currents can facilitate the cross-marginal transport of materials not only locally, but regionally. This creates a broader and more challenging view for the management of coastal marine resources that should be integrated for preparedness and response. Two examples are presented on connectivity processes. First, advances in the understanding of transport rates and pathways from the Mississippi Delta to the Florida Keys. Second, new findings on how coastal circulation near Cuba influences the evolution of the Loop Current system and the oil fate from a potential oil spill in Cuban waters. The synthesis of the above findings aims to demonstrate how knowledge acquired during GoMRI can advise future planning of scientific research to aid preparedness and response not only for the GoM, but for many offshore areas of oil exploration. The goal is to advance the understanding and predictability of oil slick trajectories over pathways from the deep to the coastal environment and vice versa.

Sign in / Sign up

Export Citation Format

Share Document