Variation in airborne $^{137}$Cs peak levels with altitude from high-altitude locations across Europe after the arrival of Fukushima-labeled air masses - Archive ouverte HAL Access content directly
Conference Papers Year : 2015

## Variation in airborne $^{137}$Cs peak levels with altitude from high-altitude locations across Europe after the arrival of Fukushima-labeled air masses

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Olivier Masson
Axel Dalheimer
• Function : Author
Sybille Estier
• Function : Author
O. Evrard
Ilia Penev
• Function : Author
Wolfgang Ringer
• Function : Author
Thomas Steinkopff
• Function : Author
Laura Tositti
• Function : Author
Anne De Vismes-Ott
• Function : Author

#### Abstract

During the Fukushima Daiichi nuclear power plant (FDNPP) accident, a dozen of high-altitude aerosol sampling stations, located between 850 and 3,454 m above sea level (a.s.l.), provided airborne activity levels across Europe (Fig. 1). This represents at most 5% of the total number of aerosol sampling locations that delivered airborne activity levels (at least one result) in Europe, in connection with this nuclear accident. High altitude stations are typically equipped with a high volume sampler that collects aerosols on filters. The Fukushima-labeled air mass arrival and the peak of airborne cesium-137 (137Cs) activity levels were registered in Europe at different dates depending on the location, with differences up to a factor of six on a regional scale. Besides this statement related to lowland areas, we have compared the maximum airborne levels registered at high-altitude European locations (850 m < altitudes < 3450 m) with what was observed at the closest lowland location. The vertical distribution of 137Cs peak level was not uniform even after a long travel time/distance from Japan. This being true at least in the atmospheric boundary layer and in the lower free troposphere. Moreover the relation '137Csmax vs. altitude' shows a decreasing trend (Fig. 2).

### Dates and versions

cea-02641207 , version 1 (28-05-2020)

### Identifiers

• HAL Id : cea-02641207 , version 1

### Cite

Olivier Masson, Jacqueline Bieringer, Axel Dalheimer, Sybille Estier, O. Evrard, et al.. Variation in airborne $^{137}$Cs peak levels with altitude from high-altitude locations across Europe after the arrival of Fukushima-labeled air masses. EGU General Assembly 2015, Apr 2015, Vienne, Austria. pp.EGU2014-2050. ⟨cea-02641207⟩

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