On the circulation of the western Gulf of Mexico with observations from April 1978

Merrell, William J.; Morrison, John M.

doi:10.1029/jc086ic05p04181

Cited by 65 publications

(42 citation statements)

References 5 publications

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“…When (32) and (33) are combined with (17)(18)(19)(20), (23) and (24), application of the remaining patch conditions results in eight homogeneous equations for the remaining eight azimuthal coefficients. The necessary condition that this system possesses a nontrivial solution for the coefficients is that the determinant of the associated eight by eight matrix vanish.…”

Section: ×8 Determinantmentioning

confidence: 99%

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Rotating modons over isolated topography in a two-layer ocean

Kirwan

Mied

Lipphardt

1997

Z. angew. Math. Phys.

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The nonlinear quasigeostrophic equations for two layers with finite scale topography in the lower layer are reduced to steady form by focusing on solutions that rotate at a constant rate and also decay monotonically outside the topography. The solutions, here called rotating baroclinic modons, are a composition of one radially dependent azimuthal component and a basic axisymmetric component. Smoothness conditions (global continuity of the streamfunction and its first derivatives), when applied to the azimuthal mode, result in a complicated eigenvalue problem. The consequence of this is a single azimuthal mode with arbitrary amplitude. When applied to the axisymmetric solution component, the smoothness conditions allow for a vortex of arbitrary amplitude, a rider, in each layer. These riders determine the rotation rate, which may be cyclonic or anticyclonic, as well as other modon parameters. Two special cases of the theory are discussed and numerical examples of the general solutions are given. The solutions exhibit a rich variety of behavior with a countable infinity of exact solution multipoles. The paper concludes with a comparison of the properties of rotating and rectilinear baroclinic modons and some speculations on applications of the theory.Mathematics Subject Classification (1991). 76C99 (Incompressible inviscid fluids, vorticity flows).

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Section: ×8 Determinantmentioning

confidence: 99%

“…We consider first the effect of the azimuthal and radial mode numbers. The azimuthal mode number is fixed by selecting n in (17)(18)(19)(20), (23), (24), (32), and (33). The radial modes are restricted to values of the β −1 i near saddle points.…”

Section: The General Problem: Mode Numbers Riders and Topographymentioning

confidence: 99%

Rotating modons over isolated topography in a two-layer ocean

Kirwan

Mied

Lipphardt

1997

Z. angew. Math. Phys.

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“…general circulation. Tidal effects have been Merrell and Morrison (1981) report a similar removed from the satellite data. Tides have paired eddy event ( Figure 25).…”

Section: On Using Ultra-low Lateralmentioning

confidence: 99%

On the Application and Evaluation of the Relocatable Diecast Ocean Circulation Model in Coastal and Semi-Enclosed Seas

Dietrich¹,

Ko²,

Yeske³

1993

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ADDENDUMThe cover shows a model output surface temperature sequence from a Gulf of Mexico run. The run is identical to Case B3 of Sections 3.1 and 5.3 except the lateral momentum diffusivity is ten times larger (200 m 2 /sec). The panels are 30 days apart. The run (with Prandtl number equal to 10) thus approximately emulates layered models, which generally have small or zero thermal diffusivity, while having finite momentum diffusivity. The increased lateral momentum diffusivity reduces the amplitude of paired cool core cyclonic recirculation eddies that are observed in the western Gulf of Mexico. Increasing lateral heat diffusivity to 200 m 2 /sec eliminates them. In such higher diffusivity cases, the old warm core western GOM eddies elongate along the shelfbreak as they dissipate. The substantial effects of Reynolds number on GOM dynamics is discussed further in this report. Color VHS animation of the Case B3 model results and model output data are available on request.All GOM runs in this report were done on a Silicon Graphics workstation using approximately 20 km lateral resolution with 20 layers (83 x 60 x 20 grid) and depths truncated at 3.5 km. In the South China Sea run (Section 6.1) with 1 10-element vectors, the model runs at over 205 megaflops on a single Cray YMP pipe. This is equivalent to less than 2 minutes per layer per model year with our GOM resolution (comparable to the fastest ocean models). The entire model vectorizes and over 99 percent of it compiles to parallel vectors. No modifications of the original SOMS model were required to achieve this full vectorization and parallelization by the Cray YMP compiler.The version of the model used here assumes constant horizontal grid increments while using the actual latitudinal Coriolis parameter distribution. The latitudinal increment is about 22 km, while the longitudinal is about 18 km. The latter is slightly less than the minimum (about 19 km) that would occur on a true sphere at the northern GOM boundary (based on 1/5 degree spacing of the bathymetry data used). This reduces the port separation between the Yucatan and Florida Straits by about 10 percent. A fully spherical version of our model is also available. 7 c 93-15471IllllhI!E~lii'y ABSTRACT To improve coastal and semi-enclosed seas modeling, a new ocean model called DieCAST (.Drtrich-Center for Air Sea Technology) has been developed. In application to the Gulf of Mexico (GOM), this model gives remarkably similar results to that obtained from the Sandia Ocean Model System (SOMS) and at a computational speed much faster than SOMS or other ocean models presently applicable using high coastal resolution.In this report, the effects of lateral diffusivity, resolution, and other parameters on SOMS and DieCAST modeled Gulf of Mexico eddies are explored. Results show: (1) that diffusivity on the order of 100 m 2 /sec or larger significantly decreases maximum velocity and frontal intensity, and greatly decreases the amplitudes of modeled paired eddies near the western GOM shelfbreak similar to th...

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“…Campeche state coastal water is affected by the current system of Yucatan/Lazo/Florida [30]. This region has a predominantly cyclonic circulation [31], caused by the wind effort [32], and by an upwelling on the north coast of the Yucatan Peninsula [33].…”

Section: Study Areamentioning

confidence: 99%

Identification of Phytoplankton Blooms under the Index of Inherent Optical Properties (IOP Index) in Optically Complex Waters

Aguilar-Maldonado

Santamaría-del-Ángel

González-Silvera

et al. 2018

Water

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Phytoplankton blooms are sporadic events in time and are isolated in space. This complex phenomenon is produced by a variety of both natural and anthropogenic causes. Early detection of this phenomenon, as well as the classification of a water body under conditions of bloom or non-bloom, remains an unresolved problem. This research proposes the use of Inherent Optical Properties (IOPs) in optically complex waters to detect the bloom or non-bloom state of the phytoplankton community. An IOP index is calculated from the absorption coefficients of the colored dissolved organic matter (CDOM), the phytoplankton (phy) and the detritus (d), using the wavelength (λ) 443 nm. The effectiveness of this index is tested in five bloom events in different places and with different characteristics from Mexican seas: 1. Dzilam (Caribbean Sea, Atlantic Ocean), a diatom bloom (Rhizosolenia hebetata); 2. Holbox (Caribbean Sea, Atlantic Ocean), a mixed bloom of dinoflagellates (Scrippsiella sp.) and diatoms (Chaetoceros sp.); 3. Campeche Bay in the Gulf of Mexico (Atlantic Ocean), a bloom of dinoflagellates (Karenia brevis); 4. Upper Gulf of California (UGC) (Pacific Ocean), a diatom bloom (Coscinodiscus and Pseudo-nitzschia) and 5. Todos Santos Bay, Ensenada (Pacific Ocean), a dinoflagellate bloom (Lingulodinium polyedrum). The diversity of sites show that the IOP index is a suitable method to determine the phytoplankton bloom conditions.

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On the circulation of the western Gulf of Mexico with observations from April 1978

Cited by 65 publications

References 5 publications

Rotating modons over isolated topography in a two-layer ocean

Rotating modons over isolated topography in a two-layer ocean

On the Application and Evaluation of the Relocatable Diecast Ocean Circulation Model in Coastal and Semi-Enclosed Seas

Identification of Phytoplankton Blooms under the Index of Inherent Optical Properties (IOP Index) in Optically Complex Waters

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