Accumulation in the Region of Wilkes, Wilkes Land, Antarctica

Black, H. P.; Budd, W. F.

doi:10.1017/s0022143000028549

Cited by 84 publications

(87 citation statements)

References 3 publications

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“…The general pattern of accumulation-rates as reported by Black and Budd (1964) has been found to be representative. The nodes of the trilateration net, however, tended to be located near tops of undulations which on the average obtain lower accumulation-rates.…”

Section: Accumulation-ratessupporting

confidence: 59%

“…A remarkable feature of the surface is the dominance of undulations of the order of several times the ice thickness as described earlier in this area by Black and Budd ( 1964). These features were a major cause of irregularities in the trilateration net which needed intervisibility between the corners to be maintained.…”

Section: Elevation and Ice Thicknessmentioning

confidence: 56%

“…Fig. I Black and Budd (1964), Budd ( 1966Budd ( , 1969, Battye (unpublished), and Walker ( 1966, unpublished). The parameters measured included: snow accumulation, surface mean temperature, surface .…”

Section: Zusammenfassung Ergebnisse Der I Agp-stromlinienstudie mentioning

confidence: 91%

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Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica

Budd

Young

1979

J. Glaciol.

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ABSTRACT. In order to d etermine accurate velocitie~ of the ice sheet in the interior of Antarctica, approximately along a flow line, a d etailed trilateration net was established in 1973 from the summit of Law Dome (100 km inland) to about 250 km south near the 2000 m contour. The net consisted of a double line of markers approximately 10 km apart with all sides a nd diagonals of the quadrilaterals m easured with tellurometers . In a ddition, satellite doppler survey positions a nd astronomical azimuths were d etermined at about 50 km intervals to control the n et on the large scale. Other measurem ents carried out en route included: continuous barometric levelling, radio echo-sounding, gravimetry, accumulation, and surface sampling. The route was close to an earlier traverse route which reached Vostok in 1962 and along which other data, including snow-surface temp eratures and tempera ture-depth gradients, were determined.The trila teration net was r e-surveyed in 1975 allowing velocities a nd strain-rates to be determined. The results indicate that the ice sheet is close to bala nce in this region.Therefo re, the measured velocities were used together with "balance velocities", further inland, to carry out a modelling study of a flow line, to d erive particle traj ectories, ages, temperature profiles, and "dynamics velocities", from a flow law. The results provide further insight into the dynamics and flow properties of the ice sheet.

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Section: Accumulation-ratessupporting

confidence: 59%

Section: Elevation and Ice Thicknessmentioning

confidence: 56%

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Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica

Budd

Young

1979

J. Glaciol.

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“…Nye ( 1959) has shown that perturbations of the equilibrium profile for central Antarctica would disappear quite rapidly (0.005 to 10 years for features of wavelength 3 to 140 km ) and concludes that observed features must represent an equilibrium profile reflecting the subsurface topography. Black and Budd ( 1964) observed accumulation patterns over waves which would tend to cause them to migrate upslope. If indeed a wave does migrate upslope it then becomes a perturbation of the equilibrium profile and should dissipate with the time constants calculated by Weertman ( 1958) .…”

Section: Origin Of Wave Featu Resmentioning

confidence: 96%

“…Undulating and step features have been observed in Greenland (Bad er, 1961 ;Bourgoin, 1956) and Antarctica (Swithinbank, 1959;Black and Budd, 1964;Gowand Rowland, 1966) both near the coasts and in the interiors. Recent discussions have centered on the origin of these features; whether they are the result of accumulation variations or are a phenomenon associated with bed topography and flow.…”

Section: Origin Of Wave Featu Resmentioning

confidence: 99%

Snow Accumulation Studies on the Thule Peninsula, Greenland

Mock¹

1968

J. Glaciol.

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. D a ta from stake m easurements, m a rk er boa rds and pits a long a J 36 km trail cross ing th e Thule peninsu la sector of the Greenland ice sheet have been used to d etermin e bot h the region a l a nd loca l distribution of sn ow accumulati on . On a reg ion a l sca le trend surfaces of m ea n a nnu a l accumulat ion ca n b e a d equa tel y predi cted from a model usin g distance from m o isture so urce a nd elevation as ind ependent p a rameters. A seri es of step-or wave-like fea tures brea k the smooth pro fil e of the ice sheet a nd ca use profound cha nges in accumula tior. ra tes on a loca l sca le. Th e accumul at ion pattern over these features can be pred icted from surface slop e a nd departure from regional elevation. Profil es of surface and subs urface topograph y indi cate a d irect rel ationship between subsu rface hills and step·like featu res, but can n ot be quantitatively accounted for by ex isting ice-flow th eo ry. D eta il ed accum ul a ti on stud ies in conjunct ion with a program of sp irit level in g in th e vicinit y of Camp Cen tury has revea led the development a sha ll ow va ll ey-like fea ture. Within this featu re accu mulat ion rates have in creased ind icating that it is the result of flow ph enomena. RESUME. Etudes de l'acclIInulatiolZ sur la pbzilZsule de ThuU, GroelZLalld. D es donnees obt enues par obser vat ion de j a lons, ba lises repcres et puits pl aces le long d'une piste d e 136 km traversant la region d e la p eninsul e d e Thule sur l'indl a ndsis du Groen la nd ont ete utilisees pou r d etermin er les distributions loca les et regiona les de l 'accumulat ion. A l'echell e regiona le, les tendances superfi ciell es concern a nt I' acc umul a tion annue ll e moyenne peuvcnt ctre prev ues de ma ni ere satisfaisa nte en utili san t un modele faisant usage d e la distance it la sou rce d ' humidite et d e I'elt~vation en tant que parametres independa nts. U n e se ri e d'irregu la rites topographiqu es e n form e de marches ou de vagues rom pt le profil uniform e de l'indl a ndsis et ca use d e profonds ch a ngem ents d es ta ux d 'accumul ation it l' ec hell e loca le. L a distribution des accumu lations sur ces irregu larites peut et re prevue en utilisa n t la p ente d es surfaces et les deviations a partir d e I'elevation region a le. Les profils topograp hiqu es superficiels et sous-superfic iel s indiquent une re lat ion directe entre les callin es soussu perficielles et les irregul a rites en fo rm e de m a rc hes, mais jls n e p euvent pas ctre expliques de maniere quantita tive p a r la presente theorie d e l'ecoulement d e la g lace. D es etudes d eta ill ees d e I'accumul at ion effectuees en relat ion avec un proj et de nive ll ement a u vo jsin age du camp " Century" ont revde la fo rm at ion d'une irregul arite en forme d e va ll ee peu profonde. Au sein d e cette irreg ul a rite, les taux d'accumu lat ion ont a ugmen te montra nt qu 'ell e est ca usee par le phenomene d 'eco ul ement.ZUSAMMENFASSUNG. Schlleeatutragsstudiell mu der TlzuLe-HaL...

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Snow bedforms: A review, new data, and a formation model

2015

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Snow bedforms, like sand bedforms, consist of various shapes that form under the action of wind on mobile particles. Throughout a year, they can cover up to 11% of the Earth surface, concentrated toward the poles. These forms impact the local surface energy balance and the distribution of precipitation. Only a few studies have concentrated on their genesis. Their size ranges from 2 cm (ripple marks) to 2.5 m tall (whaleback dunes). We counted a total of seven forms that are widely recognized. Among them sastrugi, an erosional shape, is the most widespread. From laser scans, we compared scaling of snow versus sand barchan morphology. We found that both have proportionally the same footprint, but snow barchans are flatter. The key difference is that snow can sinter, immobilizing the bedform and creating an erodible material. Using a model, we investigated the effect of sintering on snow dune dynamics. We found that sintering limits their size because it progressively hardens the snow and requires an ever-increasing wind speed to maintain snow transport. From the literature and results from this model, we have reclassified snow bedforms based on two parameters: wind speed and snow surface conditions. The new data show that snow dune behavior mirrors that of sand dunes, with merging, calving, and collision. However, isolated snow barchans are rare, with most of the snow surfaces encountered in the field consisting of several superimposed bedforms formed sequentially during multiple weather events. Spatially variable snow properties and geometry can explain qualitatively these widespread compound snow surfaces.

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Accumulation in the Region of Wilkes, Wilkes Land, Antarctica

Cited by 84 publications

References 3 publications

Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica

Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica

Snow Accumulation Studies on the Thule Peninsula, Greenland

Snow bedforms: A review, new data, and a formation model

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