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Author |
G. Picard, Q. Libois, L. Arnaud, G. Vérin, M. Dumont |
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Title |
Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series |
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Journal Article |
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Year |
2016 |
Publication  |
The Cryosphere |
Abbreviated Journal |
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Volume |
10 |
Issue |
3 |
Pages |
1297-1316 |
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Abstract |
Spectral albedo of the snow surface in the visible/near-infrared range has been measured for 3 years by an automatic spectral radiometer installed at Dome C (75°?S, 123°?E) in Antarctica in order to retrieve the specific surface area (SSA) of superficial snow. This study focuses on the uncertainties of the SSA retrieval due to instrumental and data processing limitations. We find that when the solar zenith angle is high, the main source of uncertainties is the imperfect angular response of the light collectors. This imperfection introduces a small spurious wavelength-dependent trend in the albedo spectra which greatly affects the SSA retrieval. By modeling this effect, we show that for typical snow and illumination conditions encountered at Dome C, retrieving SSA with an accuracy better than 15?% (our target) requires the difference of response between 400 and 1100?nm to not exceed 2?%. Such a small difference can be achieved only by (i) a careful design of the collectors, (ii) an ad hoc correction of the spectra using the actual measured angular response of the collectors, and (iii) for solar zenith angles less than 75°. The 3-year time series of retrieved SSA features a 3-fold decrease every summer which is significantly larger than the estimated uncertainties. This highlights the high dynamics of near-surface SSA at Dome C. |
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1110 |
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1994-0416 |
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yes |
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6427 |
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Author |
J. C. Stroeve, S. Jenouvrier, G. G. Campbell, C. Barbraud, K. Delord |
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Title |
Mapping and assessing variability in the Antarctic marginal ice zone, pack ice and coastal polynyas in two sea ice algorithms with implications on breeding success of snow petrels |
Type |
Journal |
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Year |
2016 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
10 |
Issue |
4 |
Pages |
1823-1843 |
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Abstract |
Sea ice variability within the marginal ice zone (MIZ) and polynyas plays an important role for phytoplankton productivity and krill abundance. Therefore, mapping their spatial extent as well as seasonal and interannual variability is essential for understanding how current and future changes in these biologically active regions may impact the Antarctic marine ecosystem. Knowledge of the distribution of MIZ, consolidated pack ice and coastal polynyas in the total Antarctic sea ice cover may also help to shed light on the factors contributing towards recent expansion of the Antarctic ice cover in some regions and contraction in others. The long-term passive microwave satellite data record provides the longest and most consistent record for assessing the proportion of the sea ice cover that is covered by each of these ice categories. However, estimates of the amount of MIZ, consolidated pack ice and polynyas depend strongly on which sea ice algorithm is used. This study uses two popular passive microwave sea ice algorithms, the NASA Team and Bootstrap, and applies the same thresholds to the sea ice concentrations to evaluate the distribution and variability in the MIZ, the consolidated pack ice and coastal polynyas. Results reveal that the seasonal cycle in the MIZ and pack ice is generally similar between both algorithms, yet the NASA Team algorithm has on average twice the MIZ and half the consolidated pack ice area as the Bootstrap algorithm. Trends also differ, with the Bootstrap algorithm suggesting statistically significant trends towards increased pack ice area and no statistically significant trends in the MIZ. The NASA Team algorithm on the other hand indicates statistically significant positive trends in the MIZ during spring. Potential coastal polynya area and amount of broken ice within the consolidated ice pack are also larger in the NASA Team algorithm. The timing of maximum polynya area may differ by as much as 5 months between algorithms. These differences lead to different relationships between sea ice characteristics and biological processes, as illustrated here with the breeding success of an Antarctic seabird. |
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109 |
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1994-0424 |
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1994-0424 |
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yes |
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6627 |
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2017 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
11 |
Issue |
1 |
Pages |
343-362 |
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411,414,1154 |
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Bachelor's thesis |
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1994-0424 |
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1994-0424 |
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yes |
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Call Number |
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Serial |
6672 |
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Author |
J. Grazioli, C. Genthon, B. Boudevillain, C. Duran-Alarcon, M. Del Guasta, J.-B. Madeleine, A. Berne |
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Type |
Journal |
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Year |
2017 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
11 |
Issue |
4 |
Pages |
1797-1811 |
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1143 |
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1994-0424 |
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1994-0424 |
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yes |
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Serial |
6673 |
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Year |
2014 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
8 |
Issue |
6 |
Pages |
2275-2291 |
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Programme |
1053 |
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1994-0424 |
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1994-0424 |
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yes |
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Serial |
6792 |
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Title |
Evaluation of CloudSat snowfall rate profiles by a comparison with in situ micro-rain radar observations in East Antarctica |
Type |
Journal |
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Year |
2019 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
13 |
Issue |
3 |
Pages |
943-954 |
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Programme |
1013 |
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1994-0416 |
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1994-0416 |
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yes |
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Serial |
6905 |
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Author |
F. Domine, M. Barrere, D. Sarrazin |
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Title |
Seasonal evolution of the effective thermal conductivity of the snow and the soil in high Arctic herb tundra at Bylot Island, Canada |
Type |
Journal |
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Year |
2016 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
10 |
Issue |
6 |
Pages |
2573-2588 |
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Programme |
1042 |
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1994-0424 |
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1994-0424 |
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yes |
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Serial |
6907 |
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Author |
Souverijns, N., A. Gossart, S. Lhermitte, I. V. Gorodetskaya, J. Grazioli, A. Berne, C. Durán-alarcón, B. Boudevillain, C. Genthon, C. Scarchilli, And N. P. M. Van Lipzig |
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Title |
Evaluation of the CloudSat surface snowfall product over Antarctica using ground-based precipitation radars |
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Journal |
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Year |
2018 |
Publication |
The cryosphere |
Abbreviated Journal |
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Volume |
12 |
Issue |
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Pages |
3775-3789 |
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1013 |
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1994-0416 |
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yes |
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Serial |
7405 |
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Author |
Alison F. Banwell, Rajashree Tri Datta, Rebecca L. Dell, Mahsa Moussavi, Ludovic Brucker, Ghislain Picard, Christopher A. Shuman, Laura A. Stevens |
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Title |
The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula |
Type |
Journal |
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Year |
2021 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
15 |
Issue |
2 |
Pages |
909-925 |
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Abstract |
In the 2019/2020 austral summer, the surface melt duration and extent on the northern George VI Ice Shelf (GVIIS) was exceptional compared to the 31 previous summers of distinctly lower melt. This finding is based on analysis of near-continuous 41-year satellite microwave radiometer and scatterometer data, which are sensitive to meltwater on the ice shelf surface and in the near-surface snow. Using optical satellite imagery from Landsat 8 (2013 to 2020) and Sentinel-2 (2017 to 2020), record volumes of surface meltwater ponding were also observed on the northern GVIIS in 2019/2020, with 23 % of the surface area covered by 0.62 km3 of ponded meltwater on 19 January. These exceptional melt and surface ponding conditions in 2019/2020 were driven by sustained air temperatures ?0 ?C for anomalously long periods (55 to 90 h) from late November onwards, which limited meltwater refreezing. The sustained warm periods were likely driven by warm, low-speed (?7.5 m s?1) northwesterly and northeasterly winds and not by foehn wind conditions, which were only present for 9 h total in the 2019/2020 melt season. Increased surface ponding on ice shelves may threaten their stability through increased potential for hydrofracture initiation; a risk that may increase due to firn air content depletion in response to near-surface melting. |
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1110 |
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1994-0416 |
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yes |
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Serial |
7654 |
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Author |
Detlev Helmig, Daniel Liptzin, Jacques Hueber, Joel Savarino |
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Title |
Impact of exhaust emissions on chemical snowpack composition at Concordia Station, Antarctica |
Type |
Journal |
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Year |
2020 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
14 |
Issue |
1 |
Pages |
199-209 |
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Programme |
1177 |
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Bachelor's thesis |
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1994-0416 |
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yes |
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Call Number |
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Serial |
7853 |
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