Continuously measured 222Rn activity concentrations (daily means) in near surface air at Neumayer Station in the period 1995 through 2011

We report on continuously measured 222Rn activity concentrations in near-surface air at Neumayer Station in the period 1995-2011. This 17-year record showed no long-term trend and has overall mean ± standard deviation of (0.019 ± 0.012) Bq/m**3. A distinct and persistent seasonality could be disting...

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Bibliographic Details
Main Authors: Weller, Rolf, Levin, Ingeborg, Schmithüsen, Dominik, Nachbar, Mario, Asseng, Jölund, Wagenbach, Dietmar
Format: Dataset
Language:English
Published: PANGAEA 2013
Subjects:
Air chemistry observatory
Atmospheric Chemistry @ AWI
AWI_AC
AWI_stations
AWI Antarctic Land Expedition
DATE/TIME
Date/time end
Dronning Maud Land
Antarctica
Duration
number of days
HEIGHT above ground
Neumayer_SPUSO
Radon-222 activity
SPUSO
Antarctic
The Antarctic
Neumayer
Neumayer Station
Antarc*
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.822027
https://doi.org/10.1594/PANGAEA.822027
Description
Summary:We report on continuously measured 222Rn activity concentrations in near-surface air at Neumayer Station in the period 1995-2011. This 17-year record showed no long-term trend and has overall mean ± standard deviation of (0.019 ± 0.012) Bq/m**3. A distinct and persistent seasonality could be distinguished with maximum values of (0.028 ± 0.013) Bq/m**3 from January to March and minimum values of (0.015 ± 0.009) Bq/m**3 from May to October. Elevated 222Rn activity concentrations were typically associated with air mass transport from the Antarctic Plateau. Our results do not support a relation between enhanced 222Rn activity concentrations at Neumayer and cyclonic activity or long-range transport from South America. The impact of oceanic 222Rn emissions could not be properly assessed but we tentatively identified regional sea ice extent (SIE) variability as a significant driver of the annual 222Rn cycle.

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