References of "Erpicum, Michel"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailLast century Greenland ice sheet surface mass balance projections from IPCC AR4 global models
Franco, Bruno ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

Poster (2008, April)

Results from atmosphere-ocean general circulation models (AOGCM's) for the IPCC 4th Assessment Report are used to investigate surface mass balance (SMB) future projections of the Greenland ice sheet (GrIS ... [more ▼]

Results from atmosphere-ocean general circulation models (AOGCM's) for the IPCC 4th Assessment Report are used to investigate surface mass balance (SMB) future projections of the Greenland ice sheet (GrIS). The most efficient models for the GrIS climate modeling are chosen by comparison between the 1970-1999 outputs (averages and trends) from the 20C3M Experiment outputs, and the reanalyses (ECMWF, NCEP) as well as climatologies. The SMB is estimated from the summer temperature (from which is deduced the run-off) and annual snowfall from the well-adapted AOGCM's. It is validated with 1970-1999 results from the regional climate model MAR by interpolating the AOGCM's outputs on the MAR grid. However, large uncertainties remain in these SMB projections due to the simplified physic and coarse AOGCM's resolution. High resolution simulations made with the MAR model (which simulates explicitly the SMB by taking into account the surface feedbacks) forced at its boundaries by a GrIS well-adapted AOGCM could bring more precise brief replies. [less ▲]

Detailed reference viewed: 21 (4 ULg)
Full Text
Peer Reviewed
See detailEstimation of the 1900-2100 Greenland ice sheet surface mass balance
Fettweis, Xavier ULg; Hanna, E.; Gallée, H. et al

Conference (2008, April)

Detailed reference viewed: 17 (3 ULg)
Full Text
Peer Reviewed
See detailAutomatic 1958-2007 daily weather pattern classification applied to an analysis of climatic conditions of wildfires in eastern Belgium
Erpicum, Michel ULg; Fettweis, Xavier ULg; Mabille, Georges ULg et al

Poster (2008, April)

The daily atmospheric circulation patterns classification is founded on a 100 km regular grid centred on Belgium. The geopotential heights of 500, 850 and 1000 hPa levels were extracted from the ERA-40 ... [more ▼]

The daily atmospheric circulation patterns classification is founded on a 100 km regular grid centred on Belgium. The geopotential heights of 500, 850 and 1000 hPa levels were extracted from the ERA-40 database on the period 1958-2002 and from ECMWF operational analysis until the end of year 2007. The classification was based on a similarity index calculated on the orientation of exaggerated slopes of different daily geopotential fields. Wildfire occurrences were analyzed in April and September (which are the two months with the most frequent wildfire-days in Belgium) together with monthly frequencies and persistences of daily atmospheric circulation pattern classes as well as with yearly variability of weather climate conditions. [less ▲]

Detailed reference viewed: 23 (0 ULg)
Full Text
Peer Reviewed
See detailEstimation of the Greenland ice sheet surface mass balance for the 20th and 21st centuries
Fettweis, Xavier ULg; Hanna, Edward; Gallée, Hubert et al

in The Cryosphere [=TC] (2008), 2

Results from a regional climate simulation (1970–2006) over the Greenland ice sheet (GrIS) reveals that more than 97% of the interannual variability of the modelled Surface Mass Balance (SMB) can be ... [more ▼]

Results from a regional climate simulation (1970–2006) over the Greenland ice sheet (GrIS) reveals that more than 97% of the interannual variability of the modelled Surface Mass Balance (SMB) can be explained by the GrIS summer temperature anomaly and the GrIS annual precipitation anomaly. This multiple regression is then used to empirically estimate the GrIS SMB since 1900 from climatological time series. The projected SMB changes in the 21st century are investigated with the set of simulations performed with atmosphere-ocean general circulation models (AOGCMs) of the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR4). These estimates show that the high surface mass loss rates of recent years are not unprecedented in the GrIS history of the last hundred years. The minimum SMB rate seems to have occurred earlier in the 1930s and corresponds to a zero SMB rate. The AOGCMs project that the SMB rate of the 1930s would be common at the end of 2100. The temperature would be higher than in the 1930s but the increase of accumulation in the 21st century would partly offset the acceleration of surface melt due to the temperature increase. However, these assumptions are based on an empirical multiple regression only validated for recent/current climatic conditions, and the accuracy and time homogeneity of the data sets and AOGCM results used in these estimations constitute a large uncertainty. [less ▲]

Detailed reference viewed: 186 (17 ULg)
Full Text
Peer Reviewed
See detailCirculations atmosphériques et anomalies de fonte à la surface de la calotte glaciaire du Groenland
Fettweis, Xavier ULg; Mabille, Georges ULg; Erpicum, Michel ULg

in Bulletin de la Société Géographique de Liège (2008), 51

With the aim to study the impact of the 500hPa general circulation on the Greenland ice sheet surface melt simulated by the regional climate model MAR, we developed a new Circulation Type Classification ... [more ▼]

With the aim to study the impact of the 500hPa general circulation on the Greenland ice sheet surface melt simulated by the regional climate model MAR, we developed a new Circulation Type Classification (CTC) based on the 500hPa geopotential height from the ECMWF (re)analysis over the period 1958-2007. This CTC shows that the dominant mode of the regional atmospheric variability around the Greenland is linked to the North Atlantic Oscillation (NAO) and that the surface anomalies are highly correlated to the general circulation. It explains also why a record surface melt was observed during the summer 2007. The 27th August of 2003, where the temperature was 10°C higher than the normal, is the consequence of an almost unique 500 hPa circulation in the 50 last years. [less ▲]

Detailed reference viewed: 88 (18 ULg)
See detailClimatologie - Topoclimatologie
Erpicum, Michel ULg

Book (2008)

Detailed reference viewed: 44 (16 ULg)
Full Text
See detailContribution à l'étude du climat de trois cavités souterraines belges
Piron, Julie; Erpicum, Michel ULg; Ek, Camille ULg et al

in Bulletin de la Société Royale Belge d'Etudes Géologiques et Archéologiques (2007), XLVI

Some temperature and CO2 measures have been made for one year in the cave of Ramioul and in the cave of Comblain-au-Pont, and for six months in the underground quarry of Petit-Lanaye inférieure ... [more ▼]

Some temperature and CO2 measures have been made for one year in the cave of Ramioul and in the cave of Comblain-au-Pont, and for six months in the underground quarry of Petit-Lanaye inférieure. Temperature has been measured by dataloggers. These measures and the comparison between the different caves contributed to a better understanding of their climates. In the cave of Ramioul, closed by non insulated doors, the air movements are relatively low but there are some heat exchanges between the outside and inside air by conduction through the doors. The cave can be divided into two parts each with a different climatic behaviour. High and dangerous CO2 rates have already been measured in this cave. Rates fluctuate in an irregular way and without any connection with the natural seasonal cycle, and the CO2 origins stay uncertain. The cave of Comblain-au-Pont can be divided into two major parts: one enclosed and the other ventilated. The ventilated region is a “wind tube” during the winter, but it doesn’t reverse in the summer. On a larger scale, this region can be considered as a cold air trap despite its two exits, since it has a descendant morphology. <br />In the underground carry of Petit-Lanaye inférieure, the low number of data doesn’t allow a complete diagnosis of the climate organisation, but can give a first idea for the summer period. We can already distinguish some parts that are more or less influenced by the outside temperature fluctuations, probably in relation with some air movements which organised <br />themselves in a complex way in the labyrinthic galleries network. [less ▲]

Detailed reference viewed: 81 (31 ULg)
Full Text
Peer Reviewed
See detailHistory and clinical features of atypical myopathy in horses in Belgium (2000-2005)
Votion, D. M.; Linden, Annick ULg; Saegerman, Claude ULg et al

in Journal of Veterinary Internal Medicine (2007), 21(6, Nov-Dec), 1380-1391

Background: The emergent nature of atypical myopathy or atypical myoglobinuria (AM) necessitates precise description of its clinical and epidemiologic features. Purpose: To define key features of AM to ... [more ▼]

Background: The emergent nature of atypical myopathy or atypical myoglobinuria (AM) necessitates precise description of its clinical and epidemiologic features. Purpose: To define key features of AM to help practitioners recognize the disease and to advise owners to take preventive measures. Animals: Belgian cases of AM confirmed by histology (CC horses; n = 57) from autumn 2000 to spring 2005 were included in the study. Co-grazing horses (Co-G horses; n = 77) that remained free of any abnormal clinical signs constituted a control croup. Methods: History, environmental characteristics, clinical signs, and laboratory results associated with AM were determined by a retrospective case series study. Results: Young horses in poor or normal body condition were found to be at risk for AM. Pastures were characterized by poor natural drainage and vegetation of low nutritional value. Features of AM were seasonal occurrence, apparent link with weather conditions fie, lack of solar radiation with no heavy frost and an excess of precipitation or relative humidity), sudden onset of clinical signs, and rapid death. Evaluation of serum creatine kinase activity indicated severe muscle destruction in CC horses and subclinical disease in a few Co-G horses. Conclusions: The association of AM with specific environmental conditions and individual animals suggests that young horses should not be pastured on bare premises subject to humidity when the weather has been very wet and cold for several days. Management of AM outbreaks should include control of Co-G horses who are apparently healthy. [less ▲]

Detailed reference viewed: 226 (28 ULg)
Full Text
Peer Reviewed
See detailModélisation de la distribution spatiale des précipitations en Sicile.
Cornet, Yves ULg; Fitschy, C.; Gobbato, O. et al

in Bulletin de la Société Géographique de Liège (2005), 46

Detailed reference viewed: 46 (23 ULg)
Full Text
Peer Reviewed
See detailBrouillards et mauvaises visibilités en Belgique : Analyse menée à partir des observations météorologiques effectuées dans les aéroports civils
Erpicum, Michel ULg; De Swert; Nyssen, Thierry et al

in Publications de l'Association Internationale de Climatologie (2005), 18

Detailed reference viewed: 19 (10 ULg)
Full Text
Peer Reviewed
See detailVariabilité spatio-temporelle de l’albédo. Analyse menée à la résolution métrique
Van Durme, G.; Erpicum, Michel ULg

in Bulletin de la Société Géographique de Liège (2005), 46

Albedo is a climatic factor that has been barely studied and thus is badly understood. However, it has a certain influence on our climate. This influence is especially visible in case of land use changes ... [more ▼]

Albedo is a climatic factor that has been barely studied and thus is badly understood. However, it has a certain influence on our climate. This influence is especially visible in case of land use changes, such as deforestation. The aim of the study presented in this paper is to increase the current knowledge on albedo and the factors that influence it. To achieve this, a field survey was conducted. Not all factors could be studied during the field campaign; among those that were effectively observed, the most important ones – those that were responsible for the biggest changes in albedo – were the development of vegetation, the presence of snow and the daily variation of the height of the sun. [less ▲]

Detailed reference viewed: 109 (14 ULg)
Full Text
Peer Reviewed
See detailThe Sahelian drought may have ended during the 1990s
Ozer, Pierre ULg; Erpicum, Michel ULg; Demarée, Gaston et al

in Hydrological Sciences Journal = Journal des Sciences Hydrologiques (2003), 48(3), 489-492

The severe drought that affects the Sahel since the late 1960s has been very closely studied and monitored during the last three decades. Recently, after several wet years, it was questioned from a ... [more ▼]

The severe drought that affects the Sahel since the late 1960s has been very closely studied and monitored during the last three decades. Recently, after several wet years, it was questioned from a statistical point of view whether the drought was over. The conclusions of a recent study were that the rainfall deficit was not over at the end of 2000 and that the drought continues. The analysis of the change points in the station rainfall time series suggests differentiating these findings. There is now growing evidence that there is a potential shift towards a more humid state. However, the present analysis shows that the assumption that a significant increase in rainfall may have occurred around the early 1990s could only be verified at the customary confidence level in about 10 years from now. [less ▲]

Detailed reference viewed: 47 (12 ULg)
Full Text
Peer Reviewed
See detailLa géographie appliquée à l’université de Liège
Binard, Marc ULg; Devillet, Guénaël ULg; Erpicum, Michel ULg

in Bulletin de la Société Géographique de Liège (2003), 43

Historic of the applied geography within the various units of the Geographic Department of the University of Liège (Belgium)

Detailed reference viewed: 78 (22 ULg)
Full Text
Peer Reviewed
See detailQuel est le "noyau dur" de la formation en géographie? Le point de vue d'un géographe climatologue.
Erpicum, Michel ULg

in Géographes associés , AFDG , Université Lyon II (2003), 27

Which geograpry to teach tomorrow at university? The point of view of a geographer working in climatology and topoclimatology.

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailLa climatologie
Erpicum, Michel ULg; Alexandre, Jean ULg

in Bulletin de la Société Géographique de Liège (2003), 43(2003), 79-88

Detailed reference viewed: 28 (6 ULg)
Full Text
Peer Reviewed
See detailConditions radiatives nocturnes hivernales et température de la chaussée : l’exemple de la station météoroutière de Berloz (Belgique)
Erpicum, Michel ULg; Alexandre, Jean ULg; Etienne, Hugues et al

in Publications de l'Association Internationale de Climatologie (2000), 13

Detailed reference viewed: 19 (6 ULg)
See detailClimat - Klimaat
Alexandre, Jean ULg; Erpicum, Michel ULg; Vandiepenbeeck, Marc

Cartographic material (1999)

Detailed reference viewed: 32 (7 ULg)