Possible weekly variations in the thunderstorm activity

Mullayarov, V. A.; Karimov, R. R.; Kozlov, V. I.; Poddelsky, Igor

doi:10.1016/j.jastp.2004.11.006

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…Finally, Mullayarov et al (2005) observed a WC in thunderstorm activity variations in East Siberia which they suggested to be related to the industrial activities. Ashworth (1929) claimed, for the first time, a possible decrease of rainfall on Sundays in some English cities.…”

Section: Studies About Wcs For Asiamentioning

confidence: 93%

Assessing large-scale weekly cycles in meteorological variables: a review

Sánchez-Lorenzo¹,

Laux

Franssen³

et al. 2012

Atmos. Chem. Phys.

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Abstract. Several studies have claimed to have found significant weekly cycles of meteorological variables appearing over large domains, which can hardly be related to urban effects exclusively. Nevertheless, there is still an ongoing scientific debate whether these large-scale weekly cycles exist or not, and some other studies fail to reproduce them with statistical significance. In addition to the lack of the positive proof for the existence of these cycles, their possible physical explanations have been controversially discussed during the last years. In this work we review the main results about this topic published during the recent two decades, including a summary of the existence or non-existence of significant weekly weather cycles across different regions of the world, mainly over the US, Europe and Asia. In addition, some shortcomings of common statistical methods for analyzing weekly cycles are listed. Finally, a brief summary of supposed causes of the weekly cycles, focusing on the aerosol-cloud-radiation interactions and their impact on meteorological variables as a result of the weekly cycles of anthropogenic activities, and possible directions for future research, is presented.

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Section: Studies About Wcs For Asiamentioning

confidence: 93%

Assessing large-scale weekly cycles in meteorological variables: a review

Sánchez-Lorenzo¹,

Laux

Franssen³

et al. 2012

Atmos. Chem. Phys.

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“…Within the meteorological community the debate continues as to whether patterns exist and if they do, whether they are sufficiently well established to provide the physical basis for weather forecasting. An increasing number of studies have been devoted to the cycles of meteorological variables over large areas [1][2][3][4][5][6]. Most of these studies focus on the examination of mean values of meteorological variables in order to show weekly cycles or weekly effects.…”

Section: Introductionmentioning

confidence: 99%

Diurnal and annual mean weather cycles over Nsukka, Nigeria during 2010/2011

Onyenucheya¹,

Nnamchi²

2018

Nig. J. Tech.

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This study analyzed the mean diurnal and annual cycles of weather elements over Nsukka using the data for 2010 and 2011. It is found that diurnally the peak/trough values occur as follows: temperature (15/06 hrs), relative humidity (06/15 hrs), atmospheric pressure (10/17 hrs), and wind speed (16/19 hrs). The occurrence of the maximum in temperature prior that of wind speed suggests that the dominant winds over Nsukka may be thermally driven. The mean annual peaks/troughs are viz; temperature (March/August), wind speed (December/October), relative humidity (August/January), rainfall (September/December and January) and atmospheric pressure (July/April). A roughly curvilinear fit is found between the annual rainfall and relative humidity: while rainfall appears insensitive to humidity changes during the drier months, its response tends to be linear during the rainy season.

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“…Such variations serve, in effect, as repeated experiments on the consequences of pollution. Weekly variations in temperature, pressure, cloud characteristics, hail and lightning are observed in many areas [ Lawrence , 1971; Fujibe , 1987; Gordon , 1994; Cerveny and Balling , 1998; Dessens et al , 2001; Marr and Harley , 2002; de F. Forster and Solomon , 2003; Mullayarov et al , 2005; Jin et al , 2005; Gong et al , 2006; Bäumer and Vogel , 2007]. Searches for a weekly cycle in urban precipitation, however, have yielded mixed results [ Cehak , 1982; Simmonds and Kaval , 1986; Simmonds and Keay , 1997; DeLisi et al , 2001; Jin et al , 2005; Gong et al , 2006].…”

Section: Introductionmentioning

confidence: 99%

Midweek increase in U.S. summer rain and storm heights suggests air pollution invigorates rainstorms

et al. 2008

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[1] Tropical Rainfall Measuring Mission (TRMM) satellite estimates of summertime rainfall over the southeast U.S. are found on average to be significantly higher during the middle of the work week than on weekends, attributable to a midweek intensification of afternoon storms and an increase in area with detectable rain. TRMM radar data show a significant midweek increase in the echo-top heights reached by afternoon storms. Weekly variations in model-reanalysis wind patterns over the region are consistent with changes in convection implied by the satellite data. Weekly variations in rain gauge averages are also consistent with the satellite estimates, though possibly smaller in amplitude. A midweek decrease of rainfall over the nearby Atlantic is also seen. EPA measurements of surface particulate concentrations show a midweek peak over much of the U.S. These observations are consistent with the theory that anthropogenic air pollution suppresses cloud-drop coalescence and early rainout during the growth of thunderstorms over land, allowing more water to be carried above the 0°C isotherm, where freezing yields additional latent heat, invigorating the storms and producing large ice hydrometeors. The enhanced convection induces regional convergence, uplifting and an overall increase of rainfall. Compensating downward air motion suppresses convection over the adjacent ocean areas. Pre-TRMM-era data suggest that the weekly cycle only became strong enough to be detectable beginning in the 1980's. Rain-gauge data also suggest that a weekly cycle may have been detectable in the 1940's, but with peak rainfall on Sunday or Monday, possibly explained by the difference in composition of aerosol pollution at that time. This ''weekend effect'' may thus offer climate researchers an opportunity to study the regional climate-scale impact of aerosols on storm development and monsoon-like circulation.

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Possible weekly variations in the thunderstorm activity

Cited by 8 publications

References 16 publications

Assessing large-scale weekly cycles in meteorological variables: a review

Assessing large-scale weekly cycles in meteorological variables: a review

Diurnal and annual mean weather cycles over Nsukka, Nigeria during 2010/2011

Midweek increase in U.S. summer rain and storm heights suggests air pollution invigorates rainstorms

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