Solar and meteorological influences on seasonal atmospheric 7Be in Europe for 1975 to 2018

Research output: Contribution to journalArticle

Abstract

Assessing the transport of natural radionuclides in the atmosphere provides a powerful tool to study air mass circulation. Here, we investigated the seasonal atmospheric distribution of the naturally produced 7Be in surface air over Europe between 40° N and 68° N during the period 1975–2018. The results suggest that the inter-annual variability of 7Be reflects production rates of the radionuclide induced by solar modulation of cosmic rays. Further analysis of the meteorological influences indicates that the meteorological influences on 7Be concentrations are geographically and seasonally dependent. We found that, in general, the tropopause pressure plays an important factor influencing 7Be activity for winter and spring seasons while the sea level pressure and temperature are more dominant during summer and autumn seasons. The combination of tropospheric production rates and meteorological parameters explains 24%–79% variances of the seasonal 7Be activity. We further applied a three-box model to study the influence of stratosphere-troposphere exchanges on 7Be concentrations. The simulation supports that the seasonal cycle of 7Be in Europe is controlled by two main factors: the changing height of the troposphere (seasonality of the tropopause height) and seasonal variations of the stratosphere-troposphere exchanges.

Details

Authors
Organisations
External organisations
  • Alfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven
  • University of Bremen
  • United Arab Emirates University
  • Uppsala University
  • Nanjing University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Meteorology and Atmospheric Sciences

Keywords

  • Beryllium-7, Meteorological influences, Solar modulation, Stepwise regression, Stratospheric intrusion, Three-box model
Original languageEnglish
Article number128318
JournalChemosphere
Volume263
Publication statusPublished - 2021
Publication categoryResearch
Peer-reviewedYes