Observations on the Antarctic East Wind Drift using tabular icebergs tracked by satellite Nimbus F (1975–1977)

Tchernia, P.; Jeannin, Pierre

doi:10.1016/0198-0149(80)90056-4

Cited by 37 publications

(24 citation statements)

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“…Added to this is the effect of the permanent recurvature near long. 90 0 E. (Tchernia and Jeannin, 1980) where large numbers of icebergs moving westward over or near the edge ~~ l: Budd and others (1980) (0.1 m d-1 at +1 C) that melting alone, even if it were considerably higher than these estimates, could not account for the decreasing number of icebergs in larger size categories but could explain the disappearance of icebergs in the 10-50 m size category. If melting and calving were dramatically higher, and therefore able to account for the decreasing numbers of larger icebergs, one could expect to see a change in the shape of the frequency distribution for each longitude zone between long.…”

Section: Hamley and Budd: Antarctic Iceberg Distribution And Dissolutionmentioning

confidence: 81%

“…90 0 E. The concentration of icebergs shows a maximum near long. 90 0 E. just eastward of the KerguelenGaussberg Ridge, which also corresponds to an interconnection region between easterly and westerly flow studied by Tchernia and Jeannin (1980). The more northerly extent of icebergs in the regions long.…”

Section: Hamley Alld Budd: Antarctic Iceberg Distribution and Dissolumentioning

confidence: 99%

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Antarctic Iceberg Distribution and Dissolution

Hamley

Budd

1986

J. Glaciol.

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ABSTRACT. Shipboard observations (in accordance withNorsk Polar-Institutt guidelines) from 6 years of Australian National Antarctic Research Expeditions (ANARE) voyages have provided data giving a detailed knowledge of iceberg sizes and concentrations in the Southern Ocean between long. 60 0 and 140 0 E. The resulting size-frequency distributions are examined in conjunction with a knowledge of water movement along known drift tracks in a selected stud), area (between lat. 59 0 and 64 oS., and long. 90 0 and 120 E.) to determine iceberg-dissolution rates. The "median life" (before breaking) of icebergs less than 1000 m in horizontal dimension is estimated to be 0.2 a, which is significantly lower than was previously thought. The mean melt rate is estimated to be 0.12 m d-1 , which agrees broadly with previous laboratory studies. The relative contributions of melt, calving, and breakage, plus the enhancement effect of roll-over, are examined in estimating the natural dissolution rate. Breakage appears to be the dominant mechanism for larger icebergs with melt and calving able to explain the disappearance of icebergs in the smallest categories only (within the mean "median-life" period). Examination of the historical records of Captain Cook indicates that iceberg concentrations, as well as the northerly extent in this region 200 years ago, were compatible with the present data.

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Section: Hamley and Budd: Antarctic Iceberg Distribution And Dissolutionmentioning

confidence: 81%

Section: Hamley Alld Budd: Antarctic Iceberg Distribution and Dissolumentioning

confidence: 99%

Antarctic Iceberg Distribution and Dissolution

Hamley

Budd

1986

J. Glaciol.

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“…Smith et al (1984) observed icebergs off Princess Elizabeth Land moving southwest, while those calved from the Amery Ice Shelf normally follow the western periphery of Prydz Bay toward Cape Darnley. Observation of pack ice movement, iceberg tracks, and buoy trajectories near the Antarctic coast provide additional evidence of a westward coastal current (Swithinbank et al, 1977;Tchernia and Jeannin, 1980).…”

Section: Physical and Hydrographic Setting In The Region Of Prydz Baymentioning

confidence: 99%

Most Abundant Diatom Species in Water Column Assemblages from Five Leg 119 Sites in Prydz Bay, Antarctica: Distributional Patterns

Kang¹,

Fryxell²

1991

Proceedings of the Ocean Drilling Program

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Austral summer surface and subsurface sampling of the water column was conducted at five drill sites (Sites 739-743) and included 14 stations in Prydz Bay, East Antarctica, from 66°S to 68°S approximately along 75°E, from 18 January through 3 February 1988. The samples were taken from seven depths at each station, between the surface and 200 m, to gain quantitative information on the composition, abundance, and distribution of the diatoms in water column assemblages in Prydz Bay.Over 40 , in the order of average abundance, respectively, and also as a time series in the short growing season.Two different distributional patterns were observed. Small pennate diatom species (< 20 µm), Nitzschia cylindrus, Nitzschia closterium, and Nitzschia curta, dominated at all drill sites and were distributed ubiquitously along the transect of sampling sites, while larger-celled (>20 µm) diatom species, Chaetoceros dichaeta, Chaetoceros neglectus, and Corethron criophilum, were concentrated in the inner part of Prydz Bay. The smaller-celled diatom species influenced the total diatom cell density and showed similar patterns of distribution to the totals, whereas profiles of the largercelled diatom species showed similar patterns to the chlorophyll a concentration. The larger-celled diatom species with their large cell volumes may affect the chlorophyll a distribution pattern and represent a significant biomass source inshore.Cluster analysis revealed different relationships depending on which variables were used for the analysis. When only larger-celled diatom species were included in the analysis, stations were separated clearly into those from the inner part of Prydz Bay (Sites 740 and 741) and those from the outer part of Prydz Bay (Sites 739, 742, and 743). But when only smaller-celled diatom species were used for analysis, the stations from inner and outer Prydz Bay intermingled and were not separated clearly.Diatom cell maxima were located slightly above the seasonal thermocline while chlorophyll a maxima were located in the thermocline, slightly below the diatom cell maxima. Vertical diatom distributions mirrored the physical structure in the bay. Principal component analysis (PCA) using diatom cell density (cells/L) and chlorophyll a concentration (µg /L) from discrete water samples (seven depths) as variables revealed that the samples from the Prydz Bay drill sites not only separated based on depth (above thermocline vs. below thermocline), but they also separated based on station.

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“…North of the divergence (circumpolar current), the surface water flows towards the east, while to the south it flows in the opposite direction (Antarctic coastal current). As indicated by Deacon (1979) and Tchernia & Janin (1980), the Antarctic divergence is not a well-localized front and produces multiple medium scale gyres. Data on temperature and salinity recorded during FIBEX showed doming isolines below 200 m along the 63" and 64" S transects centred on Stn 5, this was also the case at Stn 10 at 64" S and at Stns 17 and 13 at 63" S, suggesting the possibility of 2 gyre systems (Simon 1983(Simon , 1986.…”

Section: St9amentioning

confidence: 99%

Changes in lipid composition of the Antarctic krill Euphausia superba in the Indian sector of the Antarctic Ocean:influence of geographical location, sexual maturity stage and distribution among organs

Mayzaud¹,

Albessard²,

Cuzin-Roudy³

1998

Mar. Ecol. Prog. Ser.

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ABSTRACT-Lipid content and lipid class composition of Euphausia superba were studied at different levels for populations and individuals sampled in the Indian sector of the Antarctic Ocean. Strong siteto-site var~ability was recorded whlch could only partially be related to sex or development stage differences. Three groups of stations could be d~fferentiated. Northern stations were characterized by 'high lipid-high triglyceride' content, western and eastern locations by 'high lipid-high phosphatidyl choline' content and southern areas by 'low lipid-high phosphatidyl ethanolamine/glycolipid' content. Such variability was likely related to advected populations h a v~n g spent variable lengths of time in the area studled. Lipid content and class among organs were studied in 5 body fractions: abdomen, stomach, digestive gland, gonad and fat body. In absolute terms, the hi.ghest concentrations were observed in the ovaries of mature females and the abdomens of the other stages. In relative terms ("'0 dry weight), the digestive gland displayed the highest level, except in mature females. Distribution varied with stages, with low triglyceride levels in abdomen tissues of most stages and in the fat body and stomach fractions of subadults. H~g h triglyceride levels were recorded In the other fractions for post spawning females and males, as well as in the fat body fraction for mature females and in subadult gonads. A reverse pattern was observed for the relative content of phosphatidyl choline. Phosphatidyl ethanolamine showed maximum values in the abdomen and the gonad. Glycolipid percentages were maximum in the abdomen, suggesting a structural role. The roles of the different lipid classes are discussed w~t h respect to the function of the organ.

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Observations on the Antarctic East Wind Drift using tabular icebergs tracked by satellite Nimbus F (1975–1977)

Cited by 37 publications

References 0 publications

Antarctic Iceberg Distribution and Dissolution

Antarctic Iceberg Distribution and Dissolution

Most Abundant Diatom Species in Water Column Assemblages from Five Leg 119 Sites in Prydz Bay, Antarctica: Distributional Patterns

Changes in lipid composition of the Antarctic krill Euphausia superba in the Indian sector of the Antarctic Ocean:influence of geographical location, sexual maturity stage and distribution among organs

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