scholarly journals The Spring 1998 Northeastern Gulf of Mexico (NEGOM) Cold Water Event: Remote Sensing Evidence for Upwelling and for Eastward Advection of Mississippi Water (or: How an Errant Loop Current Anticyclone Took the NEGOM for a Spin)

2000 ◽  
Vol 18 (1) ◽  
Author(s):  
Frank E. Muller-Karger
Keyword(s):  
Remote Sensing ◽  
Gulf Of Mexico ◽  
Cold Water ◽  
Loop Current ◽  
Northeastern Gulf Of Mexico

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 Culture-Independent Characterization of Bacterial Communities Associated with the Cold-Water Coral Lophelia pertusa in the Northeastern Gulf of Mexico

2009 ◽  
Vol 75 (8) ◽  
pp. 2294-2303 ◽  
Author(s):  
Christina A. Kellogg ◽  
John T. Lisle ◽  
Julia P. Galkiewicz
Keyword(s):  
Gulf Of Mexico ◽  
Shallow Water ◽  
Bacterial Communities ◽  
Cold Water ◽  
Environmental Gradients ◽  
Rrna Gene ◽  
Lophelia Pertusa ◽  
Culture Independent ◽  
Northeastern Gulf Of Mexico ◽  
Study Sites

ABSTRACT Bacteria are recognized as an important part of the total biology of shallow-water corals. Studies of shallow-water corals suggest that associated bacteria may benefit the corals by cycling carbon, fixing nitrogen, chelating iron, and producing antibiotics that protect the coral from other microbes. Cold-water or deep-sea corals have a fundamentally different ecology due to their adaptation to cold, dark, high-pressure environments and as such have novel microbiota. The goal of this study was to characterize the microbial associates of Lophelia pertusa in the northeastern Gulf of Mexico. This is the first study to collect the coral samples in individual insulated containers and to preserve coral samples at depth in an effort to minimize thermal shock and evaluate the effects of environmental gradients on the microbial diversity of samples. Molecular analysis of bacterial diversity showed a marked difference between the two study sites, Viosca Knoll 906/862 (VK906/862) and Viosca Knoll 826 (VK826). The bacterial communities from VK826 were dominated by a variety of unknown mycoplasmal members of the Tenericutes and Bacteroidetes, whereas the libraries from VK906/862 were dominated by members of the Proteobacteria. In addition to novel sequences, the 16S rRNA gene clone libraries revealed many bacterial sequences in common between Gulf of Mexico Lophelia corals and Norwegian fjord Lophelia corals, as well as shallow-water corals. Two Lophelia-specific bacterial groups were identified: a cluster of gammaproteobacteria related to sulfide-oxidizing gill symbionts of seep clams and a group of Mycoplasma spp. The presence of these groups in both Gulf and Norwegian Lophelia corals indicates that in spite of the geographic heterogeneity observed in Lophelia-associated bacterial communities, there are Lophelia-specific microbes.

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.

Tracing offshore low-salinity plumes in the Northeastern Gulf of Mexico during the summer season by use of multispectral remote-sensing data

2012 ◽  
Vol 68 (5) ◽  
pp. 743-760 ◽  
Author(s):  
Young Baek Son ◽  
Wilford D. Gardner ◽  
Mary Jo Richardson ◽  
Joji Ishizaka ◽  
Joo-Hyung Ryu ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Gulf Of Mexico ◽  
Remote Sensing Data ◽  
Summer Season ◽  
Sensing Data ◽  
Low Salinity ◽  
Multispectral Remote Sensing ◽  
Northeastern Gulf Of Mexico

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>

Climatology of Ocean Features in the Gulf of Mexico Using Satellite Remote Sensing Data

2007 ◽  
Vol 37 (3) ◽  
pp. 689-707 ◽  
Author(s):  
Fred M. Vukovich
Keyword(s):  
Remote Sensing ◽  
Gulf Of Mexico ◽  
Satellite Remote Sensing ◽  
Remote Sensing Data ◽  
Loop Current ◽  
In Situ Data ◽  
Water Region ◽  
Current Water ◽  
Current Ring ◽  
Cold Core

Abstract A climatology of various ocean features in the Gulf of Mexico (GOM) was developed using the combination of satellite remote sensing and in situ data that spanned periods as long as 32 years. Twelve separate statistics were created, some of which described characteristics of the Loop Current, while others are involved with warm core rings that separate from the Loop Current and cold core rings. These statistics examined the frequency with which the Loop Current was found in the GOM, the orientation of the Loop Current, the frequency of intrusion of Loop Current water onto the west Florida shelf and into the GOM common water region, ring separation period from the Loop Current, ring dissipation, ring speed, ring path, frequency of ring water in the western GOM, and the frequency of warm and cold core rings (WCRs and CCRs, respectively) in the GOM. The results indicate that CCRs were principally responsible for mass and heat redistribution in the eastern GOM (EGOM) and WCRs are responsible for mass and heat redistribution in the western GOM (WGOM). The average period for WCR separation from the Loop Current was 11 months and the range from 5 to 19 months. WCRs moved through the WGOM most often using the central path (i.e., their trajectory was found between 24° and 26°N latitude) and they decreased to about 55% of their initial size when they reach the western wall of the GOM. CCRs were most often found in the EGOM, and their frequency of occurrence in the EGOM surpassed that of WCRs anywhere in the GOM.

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.

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