Air and wet bulb temperature lapse rates and their impact on snowmaking in a Pyrenean ski resort

• Published in: Theoretical and applied climatology Vol. 135; no. 3-4; pp. 1361 - 1373
• Main Authors: López-Moreno, Juan Ignacio, Navarro-Serrano, F., Azorín-Molina, C., Sánchez-Navarrete, P., Alonso-González, E., Rico, I., Morán-Tejeda, E., Buisan, S., Revuelto, J., Pons, M., Vicente-Serrano, S.M.
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01-02-2019; Springer; Springer Nature B.V
• Subjects: Advection (Earth sciences); Air temperature; Analysis; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Atmospheric Sciences; catchment; Climate science; climate-change; Climatology; Cyclonic circulation; Dependent variables; Dynamics; Earth and Environmental Science; Earth and Related Environmental Sciences; Earth Sciences; events; Geovetenskap och miljövetenskap; Humidity; Hygrometers; Insurance premiums; Inversions; Lapse rate; Long term care insurance; Low humidity; Meteorology & Atmospheric Sciences; mountains; Original Paper; regression; Relative humidity; Sensors; Ski resorts; Skiing; Slope; Slopes; spanish pyrenees; Surface temperature; Surface-air temperature relationships; Temperature effects; Temporal variability; Temporal variations; tourism; valley; variability; Waste Water Technology; Water Management; Water Pollution Control; Weather; Weather types; Wind speed
• ISSN: 0177-798X; 1434-4483
• DOI: 10.1007/s00704-018-2448-y

A set of 17 air temperature and relative humidity sensors were used to analyze the temporal variability of surface air temperature (Tair), wet bulb temperature (Twb), and daily snowmaking hours (SM, number of hours per day with Twb < − 2 °C), lapse rates, and the occurrence of thermal inversions at the Formigal ski resort (Spanish Pyrenees) from December to March during three consecutive ski seasons (2012–2013, 2013–2014, and 2014–2015). The Tair and Twb lapse rates showed strong hourly and daily variability, with both exhibiting almost identical temporal fluctuations.
The Twb exhibited average lapse rates that were slightly steeper (− 5.2 °C/km) than those observed for Tair (− 4.9 °C/km). The less steep lapse rates and most thermal inversions were observed in December. Days having less (more) steep Tair and Twb lapse rates were observed under low (high) wind speeds and high (low) relative humidity and air pressure. The temporal dynamics of the SM lapse rates was more complex, as this involved consideration of the average Tair in the ski resort, in addition to the driving factors of the spatio-temporal variability of Twb. Thus, on a number of cold (warm) days, snowmaking was feasible at all elevations at the ski resort, independently of the slopes of the lapse rates. The SM exhibited an average daily lapse rate of 8.2 h/km, with a progressive trend of increase from December to March.
Weather types over the Iberian Peninsula tightly control the driving factors of the Tair, Twb, and SM lapse rates (wind speed, relative humidity, and Tair), so the slopes of the lapse rates and the frequency of inversions in relation to elevation for the three variables are very dependent on the occurrence of specific weather types. The less steep lapse rates occurred associated with advections from the southeast, although low lapse rates also occurred during advections from the east and south, and under anticyclonic conditions. The steepest Tair and Twb lapse rates were observed during north and northwest advections, while the steepest rates for SM were observed during days of cyclonic circulation and advections from the northeast.