Radon variability in borehole from Multi-Parametric Geophysical Observatory of NW Himalaya in relation to meteorological parameters

Diurnal pressure variations in the Garhwal Himalaya: atmospheric fluctuations associated with the solid Earth tide

“…The spectrum plot (Figure ) for the whole 7‐year dataset, obtained using the method described above, has two distinct peaks at one and two cycles per day, as previously reported for a part of this dataset by Kamra et al . (). Atmospheric pressure varies diurnally at Kopardhar by 2.3–2.4 hPa, with a standard deviation of ~0.7 hPa, while at Dhopardhar it varies by 2.7–2.9 hPa, with a standard deviation of ~0.8 hPa.…”

A complexity measure based method for studying the dependance of 222Rn concentration time series on indoor air temperature and humidity

“…Further, in the same paper it is underlined that concerning the radon daughters, the relative humidity indoors contributes to the aerosol density and keeps the radon daughters in the indoor air. Although, in the last decade a vast number of experimental evidence has been offered about this issue (Choubey et al, 2011;Barbosa et al, 2010;Kamra et al, 2013), we still have no enough knowledge about insights of the influence of the indoor air parameters on the 222 Rn concentration variability. One of the reasons for that is nonlinearity of these dependences, which can not be elaborated by the traditional mathematical methods (Seftelis et al, 2008).…”

Seasonal emanation of radon at Ghuttu, northwest Himalaya: Differentiation of atmospheric temperature and pressure influences

“…The time series of all parameters spanning 6 years, 2007-2012 are used. The measured time series of radon concentration at Ghuttu acquired with 15 min sampling exhibited complex temporal variability marked by short term (diurnal) and long (multi-day to seasonal) periods (Arora et al, 2012;Choubey et al, 2011;Kamra et al, 2013). With an objective to suppress the influence of strong diurnal variations measured radon counts were pre-processed by aggregating 15 min sample values to daily averages.…”

“…The radon sensor probe is placed at a depth of 10 m; recording radon counts from the air column above the water level at 15 min intervals. Furthermore, meteorological parameters including atmospheric temperature, pressure and rainfall were measured at the same site with the same temporal resolution (Kamra et al, 2013). In addition, the temperature inside the borehole at 10 m depth is also recorded which shows nearly a steady value at 19.4 70.3°C throughout all seasons of the year.…”

“…The early study by Choubey et al (2009) reported a bell-shaped transient anomaly, marked by the sharp negative-positive impulse, in association with an M 4.9 Kharsali earthquake of July 22, 2007. Later Choubey et al (2011), Arora et al (2012, and Kamra et al (2013) reported the season-dependant diurnal variations in radon, which were related with the saturation of the top soil layer and the temperature gradient in a borehole environment. There is growing evidence that emanation and transport of radon in the rock matrix is also affected by meteorological parameters like rainfall, soil moisture, pressure, temperature, both at transient and at seasonal time scales (Clements and Wilkening, 1974;Mogro-Campero and Fleischer, 1977;Ball et al, 1991;Pinault and Baubron, 1997;Muramatsu et al, 2002;Finkelstein et al, 2006;Adler and Perrier, 2009;Barbosa et al, 2010;Choubey et al, 2011;Gregorič et al, 2011;Zafrir et al, 2013).…”