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Title |
Stable boundary?layer regimes at Dome C, Antarctica: observation and analysis |
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Journal |
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Year |
2017 |
Publication |
Quarterly journal of the royal meteorological society |
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143 |
Issue |
704 |
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1241-1253 |
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Keywords |
Antarctic atmosphere critical transition stable boundary layer wind?speed threshold |
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Abstract |
Investigation of meteorological measurements along a 45 m tower at Dome C on the high East Antarctic Plateau revealed two distinct stable boundary layer (SBL) regimes at this location. The first regime is characterized by strong winds and continuous turbulence. It results in full vertical coupling of temperature, wind magnitude and wind direction in the SBL. The second regime is characterized by weak winds, associated with weak turbulent activity and very strong temperature inversions reaching up to 25 K in the lowest 10 m. Vertical temperature profiles are generally exponentially shaped (convex) in the first regime and ?convex?concave?convex? in the second. The transition between the two regimes is particularly abrupt when looking at the near?surface temperature inversion and it can be identified by a 10 m wind?speed threshold. With winds under this threshold, the turbulent heat supply toward the surface becomes significantly lower than the net surface radiative cooling. The threshold value (including its range of uncertainty) appears to agree with recent theoretical predictions from the so?called ?minimum wind speed for sustainable turbulence? (MWST) theory. For the quasi?steady, clear?sky winter cases, the relation between the near?surface inversion amplitude and the wind speed takes a characteristic ?S? shape. Closer analysis suggests that this relation corresponds to a ?critical transition? between a steady turbulent and a steady ?radiative? regime, with a dynamically unstable branch in the transition zone. These fascinating characteristics of the Antarctic boundary layer challenge present and future numerical models to represent this region in a physically correct manner. |
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0035-9009 |
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0035-9009 |
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yes |
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6574 |
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Author |
Camille reverchon |
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Master 1 |
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2017 |
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1013 |
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6583 |
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Title |
Atmospheric moisture supersaturations in the near-surface atmosphere of Dome C, Antarctic Plateau |
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Conference - International - Communication |
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Year |
2017 |
Publication |
EGU 2017, 23-28 April, 2017 Vienna, Austria |
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1013 |
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Bachelor's thesis |
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6676 |
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Title |
The Ability of a General Circulation Model to represent the Atmospheric Boundary Layer over the Antarctic Plateau |
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Conference - International - Communication |
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2017 |
Publication |
EGU 2017, 23-28 April, 2017 Vienna, Austria |
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1013 |
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Bachelor's thesis |
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yes |
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6677 |
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Author |
Madeleine J.-b., C. Genthon, E. Vignon, F. Hourdin, F. Lemonnier, H. Gallée, And L. Piard |
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Title |
Measuring and Modeling Ice Supersaturation at Dome C |
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Communication |
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2017 |
Publication |
12th workshop on antarctic meteorlogy and climate, boulder, co, usa, 28-29 juin 2017 |
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1013 |
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yes |
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Serial |
6678 |
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Title |
Evaluation of CloudSat snowfall rate profiles by a comparison with in situ micro-rain radar observations in East Antarctica |
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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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6905 |
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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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2018 |
Publication |
The cryosphere |
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12 |
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Pages |
3775-3789 |
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1013 |
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ISSN |
1994-0416 |
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Approved |
yes |
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Call Number |
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Serial |
7405 |
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Title |
Modeling the Dynamics of the Atmospheric Boundary Layer Over the Antarctic Plateau With a General Circulation Model |
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Journal |
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Year |
2017 |
Publication |
Journal of Advances in Modeling Earth Systems |
Abbreviated Journal |
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Volume |
10 |
Issue |
1 |
Pages |
98-125 |
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Keywords |
Antarctic Plateau boundary-layer general circulation model LMDZ stable boundary-layer regimes |
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Abstract |
Abstract Observations evidence extremely stable boundary layers (SBL) over the Antarctic Plateau and sharp regime transitions between weakly and very stable conditions. Representing such features is a challenge for climate models. This study assesses the modeling of the dynamics of the boundary layer over the Antarctic Plateau in the LMDZ general circulation model. It uses 1 year simulations with a stretched-grid over Dome C. The model is nudged with reanalyses outside of the Dome C region such as simulations can be directly compared to in situ observations. We underline the critical role of the downward longwave radiation for modeling the surface temperature. LMDZ reasonably represents the near-surface seasonal profiles of wind and temperature but strong temperature inversions are degraded by enhanced turbulent mixing formulations. Unlike ERA-Interim reanalyses, LMDZ reproduces two SBL regimes and the regime transition, with a sudden increase in the near-surface inversion with decreasing wind speed. The sharpness of the transition depends on the stability function used for calculating the surface drag coefficient. Moreover, using a refined vertical grid leads to a better reversed ?S-shaped? relationship between the inversion and the wind. Sudden warming events associated to synoptic advections of warm and moist air are also well reproduced. Near-surface supersaturation with respect to ice is not allowed in LMDZ but the impact on the SBL structure is moderate. Finally, climate simulations with the free model show that the recommended configuration leads to stronger inversions and winds over the ice-sheet. However, the near-surface wind remains underestimated over the slopes of East-Antarctica. |
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1013 |
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1942-2466 |
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1942-2466 |
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yes |
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7195 |
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Title |
Antarctic boundary layer parametrization in a general circulation model: 1-D simulations facing summer observations at Dome C |
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2017 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
122 |
Issue |
13 |
Pages |
6818-6843 |
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Keywords |
Antarctic Plateau atmospheric boundary layer GABLS4 general circulation model physical parametrizations |
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1013 |
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2169-8996 |
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2169-8996 |
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7196 |
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Author |
Etienne Vignon |
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Title |
The extreme atmospheric boundary layer over the Antarctic Plateau and its representation in climate models |
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2017 |
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1013 |
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Bachelor's thesis |
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7930 |
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