Meridional transport and deposition of atmospheric 10 Be
By U. Heikkilä, J. Beer, Johann Feichter. 2008
154 citations recorded by the source corpus.
Be concentrations measured in ice cores exhibit larger temporal variability than expected based on theoretical production calculations. To investigate whether this is due to atmospheric transport a general circulation model study is performed with the 10 Be production divided into strato- spheric, tropospheric tropical, tropospheric subtropical and tropospheric polar sources. A control run with present day 10 Be production rate is compared with a run during a geo- magnetic minimum. The present 10 Be production rate is 4-5 times higher at high latitudes than in the tropics whereas dur- ing a period of no geomagnetic dipole field it is constant at all latitudes. The 10 Be deposition fluxes, however, show a very similar latitudinal distribution in both the present day and the geomagnetic minimum run indicating that 10 Be is well mixed in the atmosphere before its deposition. This is also con- firmed by the fact that the contribution of 10 Be produced in the stratosphere is dominant (55%-70%) and relatively con- stant at all latitudes. The contribution of stratospheric 10 Be is approximately 70% in Greenland and 60% in Antarctica reflecting the weaker stratosphere-troposphere air exchange in the Southern Hemisphere.
Subfields: Astronomy and Astrophysics, Atmospheric Science, Radiological and Ultrasound Technology
View Paper: https://www.semanticscholar.org/paper/2f01613d030823aca79830f4fc247707becfc3fb
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In Astronomy and Astrophysics
In Atmospheric Science
- C. Hoose
- Ulrike Lohmann
- P. Stier
- Johann Feichter
- Sylvaine Ferrachat
- A. Donkelaar
- E. Bard
- Randall V. Martin
Citations in the corpus
- Influences of in-cloud aerosol scavenging parameterizations on aerosol concentrations and wet deposition in ECHAM5-HAM (2009, background): “Table 5 summarizes the global and annual mean number burdens of the seven standard modes of the ECHAM5-HAM.”
- An Antarctic view of Beryllium-10 and solar activity for the past millennium (2011, background): “Still, some differences are obvious between the South Pole and the Dome Fuji (10)Be concentration records, which may be partly due to dating bias. The chronology of the South Pole core is based on 20 eruptions (red triangles on Fig. 1), but only 4 of these eruptions are used for the initial chronolo”
- SOLAR INFLUENCES ON CLIMATE (2010, unknown): “However, comparison between Greenland and Antarctic records, as well as modeling, shows that these effects are relatively small for production changes on decadal and longer time scales [Heikkilä et al., 2009] but become increasingly more serious for annual resolution.”