scholarly journals Observations and modelling of first-year ice growth and simultaneous second-year ice ablation in the Prydz Bay, East Antarctica

2017 ◽  
Vol 58 (75pt1) ◽  
pp. 59-67 ◽  
Author(s):  
Jiechen Zhao ◽  
Bin Cheng ◽  
Qinghua Yang ◽  
Timo Vihma ◽  
Lin Zhang
Keyword(s):  
Heat Flux ◽  
Temperature Gradient ◽  
East Antarctica ◽  
Prydz Bay ◽  
Large Temperature ◽  
First Year ◽  
Conductive Heat ◽  
Oceanic Heat Flux ◽  
Conductive Heat Flux ◽  
Second Year

ABSTRACT The seasonal cycle of fast ice thickness in Prydz Bay, East Antarctica, was observed between March and December 2012. In March, we observed a 0.16 m thickness gain of 0.22 m-thick first-year ice (FYI), while 1.16 m-thick second-year ice (SYI) nearby simultaneously ablated by 0.59 m. A 1-D thermodynamic sea-ice model was applied to identify the factors that led to the simultaneous growth of FYI and melt of SYI. The different evolutions were explained by the difference in the conductive heat flux between the FYI and SYI. As the FYI was thin, there was a large temperature gradient between the ice base and the colder ice surface. This generated an upward conductive heat flux, which was larger than the heat flux from the ocean to the ice base, yielding basal growth of ice. In the case of the thicker SYI the temperature gradient and, hence, the conductive heat flux were smaller, and not sufficient to balance the oceanic heat flux at the ice base, yielding basal ablation. Penetration of solar radiation affected the conductive heat flux in both cases, and the model results were sensitive to the initial ice temperature profile and the uncertainty of the oceanic heat flux.

scholarly journals An Isotopic Method of Estimating Conductive Heat Flux Through Antarctic First-Year Sea Ice

1990 ◽  
Vol 14 ◽  
pp. 270-272 ◽  
Author(s):  
R. Souchez ◽  
J. -L. Tison ◽  
J. Jouzel
Keyword(s):  
Heat Flux ◽  
Growth Rate ◽  
Sea Ice ◽  
Growth Period ◽  
Ice Cover ◽  
Rate Curve ◽  
First Year ◽  
Conductive Heat ◽  
Antarctic Sea Ice ◽  
Conductive Heat Flux

The deuterium concentration profile in a first-year Antarctic sea-ice cover is used to deduce a growth-rate curve, applying a previously published model. Time variations of the conductive heat flux throughout the growth period are then estimated from this growth-rate curve. Results indicate that the isotopic determination of sea ice growth rate can be considered as an alternate method for determining the conductive heat flux through a young sea-ice cover. However, there is need for a further test of the method by measuringin situtemperatures and growth rates during the formation of first-year sea ice, and by analyzing the isotopic composition of ice samples taken simultaneously along selected profiles during the growth period.

scholarly journals An Isotopic Method of Estimating Conductive Heat Flux Through Antarctic First-Year Sea Ice

1990 ◽  
Vol 14 ◽  
pp. 270-272
Author(s):  
R. Souchez ◽  
J. -L. Tison ◽  
J. Jouzel
Keyword(s):  
Heat Flux ◽  
Growth Rate ◽  
Sea Ice ◽  
Growth Period ◽  
Ice Cover ◽  
Rate Curve ◽  
First Year ◽  
Conductive Heat ◽  
Antarctic Sea Ice ◽  
Conductive Heat Flux

The deuterium concentration profile in a first-year Antarctic sea-ice cover is used to deduce a growth-rate curve, applying a previously published model. Time variations of the conductive heat flux throughout the growth period are then estimated from this growth-rate curve. Results indicate that the isotopic determination of sea ice growth rate can be considered as an alternate method for determining the conductive heat flux through a young sea-ice cover. However, there is need for a further test of the method by measuring in situ temperatures and growth rates during the formation of first-year sea ice, and by analyzing the isotopic composition of ice samples taken simultaneously along selected profiles during the growth period.

scholarly journals Reduced Sea Ice Production Due to Upwelled Oceanic Heat Flux in Prydz Bay, East Antarctica

2019 ◽  
Vol 46 (9) ◽  
pp. 4782-4789 ◽  
Author(s):  
Guijun Guo ◽  
Jiuxin Shi ◽  
Libao Gao ◽  
Takeshi Tamura ◽  
Guy D. Williams
Keyword(s):  
Heat Flux ◽  
Sea Ice ◽  
East Antarctica ◽  
Prydz Bay ◽  
Oceanic Heat Flux ◽  
Ice Production

scholarly journals Growth of first-year landfast Antarctic sea ice determined from winter temperature measurements

2006 ◽  
Vol 44 ◽  
pp. 170-176 ◽  
Author(s):  
Craig R. Purdie ◽  
Patricia J. Langhorne ◽  
Greg H. Leonard ◽  
Tim G. Haskell
Keyword(s):  
Heat Flux ◽  
Sea Ice ◽  
Ice Cores ◽  
First Year ◽  
Conductive Heat ◽  
Ice Growth ◽  
Antarctic Sea Ice ◽  
Oceanic Heat Flux ◽  
Landfast Sea Ice ◽  
Platelet Ice

AbstractTemperature profiles of first-year landfast sea ice have been recorded continuously over the 2003 winter growth season at McMurdo Sound, Antarctica. The temperature gradients in the ice were used to calculate the growth rate due to conductive heat flux, which is shown to account for only part of the total ice growth. Remaining ice growth must be due to a negative oceanic heat flux. Significantly, this oceanic heat flux is shown to occur episodically, sometimes with sustained daily rates in excess of –30Wm–2. There is no direct correlation between oceanic heat flux and water temperature. Times of increased oceanic heat flux do coincide with the appearance of platelet ice in cores, and appear to account for the growth of 35% of the total platelet ice depth measured in ice cores.

scholarly journals Oceanic Heat Flux as a Component of the Heat Budget of Sea Ice

1985 ◽  
Vol 6 ◽  
pp. 171-173 ◽  
Author(s):  
M. P. Langleben
Keyword(s):  
Heat Flux ◽  
Sea Ice ◽  
Latent Heat ◽  
Heat Budget ◽  
Average Rate ◽  
Ice Cores ◽  
Ice Cover ◽  
Energy Balance Equation ◽  
Conductive Heat ◽  
Oceanic Heat Flux

Heat budget studies of the sea ice cover near Pond Inlet, NWT, were made using data obtained at two locations in Eclipse Sound, one about 0.5 km from shore and the other about 7.5 km from shore. The observations at intervals of one week included ice temperatures at 10 cm separation in vertical profile, salinities of adjacent 2.5 cm-thick slices from vertical ice cores, and ice thickness. The time series analysed extend from three to six months in the six data sets obtained for three winters of observations. Values of oceanic heat flux have been determined as residuals in the energy balance equation applied to the ice cover. The results show that in Eclipse Sound the oceanic heat flux is a significant component of the heat budget of the ice cover. Its value over the winter is typically about 6 W m-2about half as large as the average rate of release of the latent heat of freezing. There does not appear to be any systematic variation in value of the 4 week-average oceanic heat flux during the season. Nor is there any apparent correlation of oceanic heat flux with rate of release of latent heat (ie ice growth rate), or with the severity of the winter as measured by the magnitude of the conductive heat flux.

Close analogy between radiative and conductive heat flux in a finite slab

AIAA Journal ◽  
1964 ◽  
Vol 2 (12) ◽  
pp. 2180-2186 ◽  
Author(s):  
MAX A. HEASLET ◽  
BARRETT BALDWIN
Keyword(s):  
Heat Flux ◽  
Conductive Heat ◽  
Close Analogy ◽  
Finite Slab ◽  
Conductive Heat Flux

scholarly journals Variations of ablation, albedo and energy balance at the margin of the Greenland ice sheet, Kronprins Christian Land, eastern north Greenland

1995 ◽  
Vol 41 (137) ◽  
pp. 174-182 ◽  
Author(s):  
Thomas Konzelmann ◽  
Roger J. Braithwaite
Keyword(s):  
Heat Flux ◽  
Energy Balance ◽  
Latent Heat ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Small Scale ◽  
Conductive Heat ◽  
Net Radiation ◽  
Conductive Heat Flux ◽  
North Greenland

AbstractA meteorological and glaciological experiment was carried out in July 1993 at the margin of the Greenland ice sheet in Kronprins Christian Land, eastern north Greenland. Within a small area (about 100 m2) daily measurements were made on ten ablation stakes fixed in “light” and “dark” ice and were compared to each other. Simultaneously, the components of the energy balance, including net radiation, sensible-heat flux, latent-heat flux and conductive-heat flux in the ice were determined. Global radiation, longwave incoming radiation and albedo were measured, and longwave outgoing radiation was calculated by assuming that the glacier surface was melting. Sensible-and latent-heat fluxes were calculated from air temperature, humidity and wind speed. Conductive-heat flux in the ice was estimated by temperature-profile measurements in the uppermost ice layer. Net radiation is the major source of ablation energy, and turbulent fluxes are smaller energy sources by about three times, while heat flux into the ice is a substantial heat sink, reducing energy available for ice melt. Albedo varies from 0.42 to 0.56 within the experimental site and causes relatively large differences in ablation at stakes close to each other. Small-scale albedo variations should therefore be carefully sampled for large-scale energy-balance calculations.

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