Summer to Winter Diurnal Variabilities of Temperature and Water Vapour in the Lowermost Troposphere as Observed by HAMSTRAD over Dome C, Antarctica

Ricaud, Philippe; Genthon, Christophe; Durand, Pierre; Attié, Jean-Luc; Carminati, Fabien; Canut, Guylaine; Vanacker, J.-F.; Moggio, L.; Courcoux, Yann; Pellegrini, A.; Rose, Thomas

doi:10.1007/s10546-011-9673-6

Cited by 23 publications

(76 citation statements)

References 24 publications

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“…14b shows the 5-day back trajectories at the five selected pressure levels on 5 April 2011 at 12:00 UTC, corresponding to the time of minimum temperature and absolute humidity of an air parcel issued from Dome C. We can note that all the calculated air masses are originated from the Antarctic Plateau whatever the pressure level considered. Consequently, as already studied in Ricaud et al (2012Ricaud et al ( , 2014c, we expect that both temperature and H 2 O tend to decrease on 5 April at 12:00 UTC compared to the surrounding periods because air masses with continental origins produce a cold and dry atmosphere above Dome C (as on 5 April 2011).…”

Section: Origin Of Air Massesmentioning

confidence: 66%

“…It has been running automatically since January 2010. Science and validation studies using HAMSTRAD data are detailed in Ricaud et al (2012Ricaud et al ( , 2013Ricaud et al ( , 2014aRicaud et al ( -c, 2015. All the HAM-STRAD data measured since 2009 are freely available at the following address: http://www.cnrm.meteo.fr/spip.php?…”

Section: The Hamstrad Radiometermentioning

confidence: 99%

“…Both the impact of the origin of air masses on the shortterm variability of H 2 O and temperature and the high correlation coefficient (greater than 0.90) between water vapour and temperature at Dome C over the entire year 2010 were presented in Ricaud et al (2012Ricaud et al ( , 2014c) based on 5-day backtrajectory calculations. We propose, in the present study, to use the same methodology to interpret the time evolution of the atmosphere during the two above-mentioned episodes.…”

Section: Origin Of Air Massesmentioning

confidence: 99%

“…At the Dome C station, numerous studies already focussed on the diurnal and seasonal variations of the atmospheric boundary layer (e.g. Ricaud et al, 2012).…”

mentioning

confidence: 99%

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Genesis of diamond dust, ice fog and thick cloud episodes observed and modelled above Dome C, Antarctica

Ricaud¹,

Bazile²,

Guasta³

et al. 2017

Atmos. Chem. Phys.

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Abstract. Episodes of thick cloud and diamond dust/ice fog were observed during 15 March to 8 April 2011 and 4 to 5 March 2013 in the atmosphere above Dome C (Concordia station, Antarctica; 75 • 06 S, 123 • 21 E; 3233 m a.m.s.l.). The objectives of the paper are mainly to investigate the processes that cause these episodes based on observations and to verify whether operational models can evaluate them. The measurements were obtained from the following instruments: (1) a ground-based microwave radiometer (HAM-STRAD, H 2 O Antarctica Microwave Stratospheric and Tropospheric Radiometers) installed at Dome C that provided vertical profiles of tropospheric temperature and absolute humidity every 7 min; (2) daily radiosoundings launched at 12:00 UTC at Dome C; (3) a tropospheric aerosol lidar that provides aerosol depolarization ratio along the vertical at Dome C; (4) down-and upward short-and long-wave radiations as provided by the Baseline Surface Radiation Network (BSRN) facilities; (5) an ICE-CAMERA to detect at an hourly rate the size of the ice crystal grains deposited at the surface of the camera; and (6) space-borne aerosol depolarization ratio from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) lidar aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) platform along orbits close to the Dome C station. The time evolution of the atmosphere has also been evaluated by considering the outputs from the mesoscale AROME and the global-scale ARPEGE meteorological models. Thick clouds are detected during the warm and wet periods (24-26 March 2011 and 4 March 2013) with high depolarization ratios (greater than 30 %) from the surface to 5-7 km above the ground associated with precipitation of ice particles and the presence of a supercooled liquid water (depolarization less than 10 %) clouds. Diamond dust and/or ice fog are detected during the cold and dry periods (5 April 2011 and 5 March 2013) with high depolarization ratios (greater than 30 %) in the planetary boundary layer to a maximum altitude of 100-300 m above the ground with little trace of precipitation. Considering 5-day back trajectories, we show that the thick cloud episodes are attributed to air masses with an oceanic origin whilst the diamond dust/ice fog episodes are attributed to air masses with continental origins. Although operational models can reproduce thick cloud episodes in the free troposphere, they cannot evaluate the diamond dust/ice fog episodes in the planetary boundary layer because they require to use more sophisticated cloud and aerosol microphysics schemes.

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Section: Origin Of Air Massesmentioning

confidence: 66%

Section: The Hamstrad Radiometermentioning

confidence: 99%

Section: Origin Of Air Massesmentioning

confidence: 99%

“…At the Dome C station, numerous studies already focussed on the diurnal and seasonal variations of the atmospheric boundary layer (e.g. Ricaud et al, 2012).…”

mentioning

confidence: 99%

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Genesis of diamond dust, ice fog and thick cloud episodes observed and modelled above Dome C, Antarctica

Ricaud¹,

Bazile²,

Guasta³

et al. 2017

Atmos. Chem. Phys.

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“…atmosphérique selon les saisons (Ricaud et al, 2012) et pour l'étude des tendances à long terme de la vapeur d'eau et de la température induite par l'évolution du climat, et réciproquement. En effet, le site est situé sur le plateau antarctique avec 24 heures de jour en été et 24 heures de nuit en hiver, une température climatologique de surface comprise entre -40 et -20°C en été et entre -80 et -60°C en hiver (Tomasi et al, 2006).…”

Section: Les Régions Polaires Et Le Changement Climatiqueunclassified

Variabilités de la vapeur d'eau et de la température troposphérique au Dôme C (station Concordia), Antarctique. Partie I : l'instrument Hamstrad

Ricaud¹

2014

Météorologie

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Modeling the Dynamics of the Atmospheric Boundary Layer Over the Antarctic Plateau With a General Circulation Model

Vignon

Hourdin

Genthon

et al. 2018

J Adv Model Earth Syst

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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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Summer to Winter Diurnal Variabilities of Temperature and Water Vapour in the Lowermost Troposphere as Observed by HAMSTRAD over Dome C, Antarctica

Cited by 23 publications

References 24 publications

Genesis of diamond dust, ice fog and thick cloud episodes observed and modelled above Dome C, Antarctica

Genesis of diamond dust, ice fog and thick cloud episodes observed and modelled above Dome C, Antarctica

Variabilités de la vapeur d'eau et de la température troposphérique au Dôme C (station Concordia), Antarctique. Partie I : l'instrument Hamstrad

Modeling the Dynamics of the Atmospheric Boundary Layer Over the Antarctic Plateau With a General Circulation Model

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