Weekly cycle in particulate matter versus weekly cycle in precipitation over Switzerland

Barmet, Peter; Kuster, Thomas; Muhlbauer, Andreas; Lohmann, Ulrike

doi:10.1029/2008jd011192

Cited by 48 publications

(72 citation statements)

References 22 publications

(33 reference statements)

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“…The statistical tests done did not support statistically significant differences in CCN-sized aerosol number concentrations between individual weekdays or between work-week and week-end. This result is different previous studies using particle mass or AOT as the aerosol tracer, where weekly variation was detected even in multi-year weekday means Barmet et al, 2009).…”

Section: Discussioncontrasting

confidence: 54%

Number size distributions and seasonality of submicron particles in Europe 2008–2009

et al. 2011

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Abstract.Two years of harmonized aerosol number size distribution data from 24 European field monitoring sites have been analysed. The results give a comprehensive overview of the European near surface aerosol particle number concentrations Correspondence to: A. Asmi (ari.asmi@helsinki.fi) and number size distributions between 30 and 500 nm of dry particle diameter. Spatial and temporal distribution of aerosols in the particle sizes most important for climate applications are presented. We also analyse the annual, weekly and diurnal cycles of the aerosol number concentrations, provide log-normal fitting parameters for median number size distributions, and give guidance notes for data users. Emphasis is placed on the usability of results within the aerosol modelling community.Published by Copernicus Publications on behalf of the European Geosciences Union. We also show that the aerosol number concentrations of Aitken and accumulation mode particles (with 100 nm dry diameter as a cut-off between modes) are related, although there is significant variation in the ratios of the modal number concentrations. Different aerosol and station types are distinguished from this data and this methodology has potential for further categorization of stations aerosol number size distribution types.The European submicron aerosol was divided into characteristic types: Central European aerosol, characterized by single mode median size distributions, unimodal number concentration histograms and low variability in CCN-sized aerosol number concentrations; Nordic aerosol with low number concentrations, although showing pronounced seasonal variation of especially Aitken mode particles; Mountain sites (altitude over 1000 m a.s.l.) with a strong seasonal cycle in aerosol number concentrations, high variability, and very low median number concentrations. Southern and Western European regions had fewer stations, which decreases the regional coverage of these results. Aerosol number concentrations over the Britain and Ireland had very high variance and there are indications of mixed air masses from several source regions; the Mediterranean aerosol exhibit high seasonality, and a strong accumulation mode in the summer. The greatest concentrations were observed at the Ispra station in Northern Italy with high accumulation mode number concentrations in the winter. The aerosol number concentrations at the Arctic station Zeppelin in Ny-Ålesund in Svalbard have also a strong seasonal cycle, with greater concentrations of accumulation mode particles in winter, and dominating summer Aitken mode indicating more recently formed particles. Observed particles did not show any statistically significant regional work-week or weekday related variation in number concentrations studied.Analysis products are made for open-access to the research community, available in a freely accessible internet site. The results give to the modelling community a reliable, easy-touse and freely available comparison dataset of aerosol size distributions.

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Section: Discussioncontrasting

confidence: 54%

Number size distributions and seasonality of submicron particles in Europe 2008–2009

et al. 2011

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“…On the other hand, no significant weekly differences are found in the rainfall series, which is in contradiction with the results of Bäumer and Vogel (2007). Barmet et al (2009) Quaas et al (2009) published a work trying to verify the possible WCs over a large area in Europe using, for the first time to our knowledge, two state-of-art global climate models (GCM). The different GCM simulations are compared against ground-based observations (2001-2006 period) and satellite data (2000-2008 period).…”

Section: Studies About Wcs For Asiacontrasting

confidence: 42%

“…Murphy et al, 2008), Europe (e.g. Barmet et al, 2009) and Asia (e.g. Gong et al, 2007;Choi et al, 2008a;Kim et al, 2009) suggesting lower values during weekends and higher values during workdays, which can be attributed to decreased industrial activity and traffic during weekends in urban and industrialised regions, as well as the ban on heavy-duty vehicle traffic on Sundays in some areas.…”

Section: Evidences Of Wcs In Pollution and Anthropogenic Aerosolsmentioning

confidence: 99%

“…Barmet et al, 2009;Hendricks Franssen et al, 2009;Quaas et al, 2009). The periodogram should show a clear distinct spectral peak at 1/7 d −1 .…”

Section: Weekly Cycles Dilemma: a Statistical Talementioning

confidence: 99%

“…Other authors used some alternative testing procedures with less restrictive assumptions for the analysis of WCs (Hendricks Franssen, 2008;Laux and Kunstmann, 2008;Barmet et al, 2009;Hendricks Franssen et al, 2009;Marani, 2010). Monte Carlo bootstrapping methods can deal with arbitrary probability distributions and dependencies between time series observed at different meteorological stations.…”

Section: Weekly Cycles Dilemma: a Statistical Talementioning

confidence: 99%

See 2 more Smart Citations

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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Weekly cycles of global fires—Associations with religion, wealth and culture, and insights into anthropogenic influences on global climate

Earl

Simmonds

Tapper

2015

Geophysical Research Letters

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One approach to quantifying anthropogenic influences on the environment and the consequences of those is to examine weekly cycles (WCs). No long‐term natural process occurs on a WC so any such signal can be considered anthropogenic. There is much ongoing scientific debate as to whether regional‐scale WCs exist above the statistical noise level, with most significant studies claiming that anthropogenic aerosols and their interaction with solar radiation and clouds (direct/indirect effect) is the controlling factor. A major source of anthropogenic aerosol, underrepresented in the literature, is active fire (AF) from anthropogenic burning for land clearance/management. WCs in AF have not been analyzed heretofore, and these can provide a mechanism for observed regional‐scale WCs in several meteorological variables. We show that WCs in AFs are highly pronounced for many parts of the world, strongly influenced by the working week and particularly the day(s) of rest, associated with religious practices.

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Weekly cycle in particulate matter versus weekly cycle in precipitation over Switzerland

Cited by 48 publications

References 22 publications

Number size distributions and seasonality of submicron particles in Europe 2008–2009

Number size distributions and seasonality of submicron particles in Europe 2008–2009

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

Weekly cycles of global fires—Associations with religion, wealth and culture, and insights into anthropogenic influences on global climate

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