Summer Total Cloud Cover Weekly Variability over Europe: Sign of Aerosols’ Indirect Effect?

  • A. K. Georgoulias
  • K. A. Kourtidis
  • G. Alexandri
  • A. Sanchez-Lorenzo
Conference paper
Part of the Springer Atmospheric Sciences book series (SPRINGERATMO)

Abstract

The Day of Week (DoW) variability of total cloud cover (TCC) and aerosol optical depth (AOD550) and its statistical significance over six European regions is investigated using 10 years of summertime satellite observations from TERRA and AQUA MODIS. In general, positive (higher values during midweek) weekly cycles in both AOD550 and TCC appear over Central Europe (CE), while a strong negative weekly cycle appears over the Iberian Peninsula and NE Europe (NEE). A very similar TCC and AOD550 weekly variability appears over CE, SW Europe (SWE) and NEE and a rather similar one over Central Mediterranean (CM). Possible scenarios that could explain the common weekly variability of aerosols and cloud cover through the aerosol indirect effects are discussed. An effort is made to verify our results and the proposed aerosol-cloud interaction scenarios with the use of independent satellite TCC data from the ISCCP and ground-based precipitation data from the ECA&D project.

References

  1. Bäumer D, Rinke R, Vogel B (2008) Weekly periodicities of aerosol optical thickness over central Europe-evidence of an anthropogenic direct aerosol effect. Atmos Chem Phys 8:83–90. doi:10.5194/acp-8-83-2008 CrossRefGoogle Scholar
  2. Bell TL, Rosenfeld D, Kim K-M, Yoo J-M, Lee M-I, Hahnenberger M (2008) Midweek increase in US summer rain and storm heights suggests air pollution invigorates rainstorms. J Geophys Res 113:D02209. doi:10.1029/2007JD008623 CrossRefGoogle Scholar
  3. Georgoulias AK, Kourtidis KA (2011) On the aerosol weekly cycle spatiotemporal variability over Europe. Atmos Chem Phys 11:4611–4632. doi:10.5194/acp-11-4611-2011 CrossRefGoogle Scholar
  4. Quaas J, Boucher O, Jones A, Weedon GP, Kieser J, Joos H (2009) Exploiting the weekly cycle as observed over Europe to analyse aerosol indirect effects in two climate models. Atmos Chem Phys 9:8493–8501. doi:10.5194/acp-9-8493-2009 CrossRefGoogle Scholar
  5. Rosenfeld D et al (2008) Flood or drought: how do aerosols affect precipitation? Science 321(5894):1309–1313. doi:10.1126/science.1160606 CrossRefGoogle Scholar
  6. Sanchez-Lorenzo A et al. (2012) Assessing large large-scale weekly cycles in meteorological variables: a review. Atmos Chem Phys Discuss 12:1451-1491. doi:10.5194/acpd-12-1451-2012 Google Scholar
  7. Xia X, Eck TF, Holben BN, Phillippe G, Chen H (2008) Analysis of the weekly cycle of aerosol optical depth using AERONET and MODIS data. J Geophys Res 113:D14217. doi:10.1029/2007JD009604 CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • A. K. Georgoulias
    • 1
  • K. A. Kourtidis
    • 1
  • G. Alexandri
    • 2
  • A. Sanchez-Lorenzo
    • 3
  1. 1.Laboratory of Atmospheric Pollution and Pollution Control Engineering of Atmospheric Pollutants, Department of Environmental EngineeringDemocritus University of ThraceXanthiGreece
  2. 2.Laboratory of Atmospheric physicsAristotle University of ThessalonikiThessalonikiGreece
  3. 3.Institute for Atmospheric and Climate Science, ETH ZürichZürichSwitzerland

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