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Worth D. Nowlin Jr.
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Worth D. Nowlin Jr.
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Worth D. Nowlin Jr.
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Worth D. Nowlin Jr.

The status of the United States planning activities for the World Ocean Circulation Experiment (WOCE) for 1988 is presented at length in this article. The following six topics are emphasized: 1) Structure and general planning activities; 2) Summary of projected 1988 meetings; 3) Numerical modeling; 4) Data management; 5) Technology development; and 6) Observation and analysis components. Part 6 is divided into eight subsections that include: a) Satellite measurements; b) WOCE Hydrographic Program (WHP); c) Global Sea-Level Program; d) WOCE velocity measurements; e) Core Project 1 surface-layer studies; f) Global atmospheric-ocean exchanges; g) Core Project 3 studies; and h) analysis and interpretation projects.

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Worth D. Nowlin Jr.
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Arnold L. Gordon and Worth D. Nowlin Jr.

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Hydrographic data were obtained within the Bransfield Strait and adjacent waters during February and March 1975 by R/V Conrad and R/V Melville as part of FDRAKE 75. Within the Strait the circumpolar Deep Water is either missing or its influence is weak. The salinity maximum, oxygen minimum and silicate maximum present in the upper layers of the Strait attenuate toward the east, demonstrating the eastward decrease of Bellingshausen Sea influence. The Strait contains three basins separated from one another by sills less than 1500 m deep and from adjacent ocean areas by depth near or less than 500 m, except for a channel to the northeast of slightly over 1100 m depth. The deep and bottom waters of these basins, with depths to nearly 2600 m, are significantly colder, less saline, higher in oxygen and lower in nutrient concentrations than the deep exterior water adjacent to the Strait. These characteristics confirm Clowes' (1934) contention that the waters of these basins are renewed by local convection. Supportive evidence for post-bomb renewal is provided by tritium measurements from the easternmost basin of the Strait. Bottom (2566 m) tritum values are essentially the same as surface values, which are greater than expected for subsurface water which has not recently been in contact with the surface waters. Comparison of T-S relations suggests that one mixing component of near-surface water in the convective renewal of Bransfield bottom water is the same as that involved in Weddell Sea bottom water formation. The FDRAKE data set shows that the character of the deep and bottom waters is different within each of the three major basins, suggesting significant spatial (or temporal) variability of the convective events occurring in the Strait. Water mass distributions of the southern Drake Passage and the Weddell Sea are apparently not influenced by outflow of Bransfield basin water. Likewise, there seems to be no direct outflow of deep or bottom waters from the Bransfield basins into the Weddell-Scotia confluence Zone.

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Wensu Wang, Worth D. Nowlin Jr., and Robert O. Reid

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Hourly wind fields for the northwestern Gulf of Mexico (here called LATEX winds) were constructed from in situ measurements for the period April 1992 through November 1994 using statistical (optimal) interpolation. Here the LATEX winds are compared with the National Centers for Environmental Prediction (NCEP) and the European Remote Sensing Satellite (ERS-1) scatterometer winds for the same period and region. Comparisons show no significant bias between LATEX and ERS-1 wind speeds or directions. LATEX and ERS-1 wind fields nearly coincide except during extreme meteorological events when ERS-1 fields may show noncoherent patterns over distances for which coherence is expected; for those situations, LATEX winds appear more realistic. Although there is no significant bias between wind speeds, the direction bias is more than 10° between the LATEX and NCEP winds. The largest differences between LATEX and NCEP winds occurred near the coast. In summer, the NCEP and LATEX winds showed larger differences and smaller variance; for winter the reverse was true. The authors conclude from the comparisons that LATEX wind fields provided realistic and detailed surface winds that are appropriate for the study of mesoscale processes and forcing of numerical models over the Texas–Louisiana continental shelf.

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Worth D. Nowlin Jr., Thomas Whitworth III, and R. Dale Pillsbury

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Three-week average speeds from an array of current meter moorings which spanned Drake Passage were used in conjunction with geostrophic calculations to estimate the short-term transport of the Antarctic Circumpolar Current. Closely spaced hydrographic stations show that the current consists of three vertically coherent bands of relatively high speed within the generally eastward flow. These bands separate four water mass regimes which have distinct T-S relationships at depths above the core of the Circumpolar Deep Water. The geostrophic transport relative to 3000 db averaged 95×106 m3 s−1 for five transects of the Passage and is consistent with previous measurements. Referencing the geostrophic transport to the current meter measurements gives an adjusted transport of 124×106 m3 s−1 to the east. This estimate is about midway between values obtained in the two previous attempts to adjust relative transport through Drake Passage to observed velocities. The previous estimates are reconsidered and compared with this latest estimate.

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Wensu Wang, Worth D. Nowlin Jr., and Robert O. Reid

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The primary objective of this work is to formulate surface meteorological fields over the northwestern Gulf of Mexico for the period from April 1992 through November 1994 useful for the study of mesoscale processes and for model forcing of the near-coastal circulation. Observations were adjusted to standard heights, and a method of statistical interpolation was applied to time series of in situ observations to produce the required surface fields. Resulting monthly and seasonal mean fields show two principal patterns over the Texas-Louisiana shelf region—for summer and nonsummer. From June through August, surface winds are relatively constant, with alongshore wind components generally directed upcoast (from Mexico toward the Mississippi Delta). In other (nonsummer) months, surface winds are much more variable with alongshore wind components generally directed downcoast. The relatively large interannual variability is illustrated. Using these meteorological fields together with rather complete oceanographic data available from the same period, the effects of episodic atmospheric events on the circulation and properties of the Texas-Louisiana shelf may be examined. As examples, two extreme atmospheric events are characterized in terms of wind, surface air temperature, SST, and sensible heat flux fields: a cold air outbreak in November 1992 and a cyclone generated in March 1993 known as the “Storm of the Century.”

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Joseph L. Reid, Worth D. Nowlin Jr., and William C. Patzert

Abstract

The waters found within the southwestern Atlantic Ocean extend into it as separate lavers with markedly different characteristics. Along the western boundary the deeper waters, derived from the North Atlantic, are warm, highly saline, oxygen-rich and nutrient-poor. This North Atlantic Deep Water (NADW) lies within the density range of the Circumpolar Water (CPW) from the south, which is cooler, lower in salinity, very low in oxygen and very high in nutrients. Where the NADW and CPW meet in the southwestern Atlantic, the NADW separates the CPW into two layers above and below the NADW—each less saline, richer in nutrients and lower in oxygen than the NADW.

Above the upper branch of the CPW lies the Subantarctic Intermediate Water, which is lowest in salinity of all the layers. Beneath the lower branch of the CPW lies an abyssal layer derived from the mid-depths of the Weddell Sea. It is colder, less saline, lower in nutrients and higher in oxygen than the Circumpolar Water.

These layers appear to be separated vertically by density gradients which tend to be sharper at the interface than in the layers themselves. These maxima in stability, which result from the interleaving of water masses from different sources, extend over hundreds of kilometers: apparently vertical exchange processes are not strong enough to dissipate them.

Within the Argentine Basin the circulation of all except the abyssal layer appears to be anticyclonic and so tightly compressed against the western boundary that equatorward flow is observed just offshore of the poleward flow at the boundary. Waters from the north (within the Brazil current near the surface and from the North Atlantic at greater depths) flow southward along the western boundary and turn eastward near 40°S, part returning around the anticyclonic gyre and part joining the Antarctic Circumpolar Current. Likewise the Circumpolar Waters, which have entered from the Pacific, flow northward along the western boundary to about 40°S and then turn eastward, both above and below the NADW. The abyssal waters are derived from the Weddell Sea. Within the Argentine Basin they flow northward along the western boundary and turn eastward south of the Rio Grande Rise, and then southward on the western flank of the Mid-Atlantic Ridge; the abyssal flow is cyclonic beneath the anticyclonic upper circulation.

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