Meridional transport and deposition of atmospheric 10 Be
10 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 stratospheric,...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus
2009
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-9-515-2009 |
id |
fteawag:oai:dora:eawag_5982 |
---|---|
record_format |
openpolar |
spelling |
fteawag:oai:dora:eawag_5982 2024-09-15T17:48:15+00:00 Meridional transport and deposition of atmospheric 10 Be Heikkilä, U. Beer, J. Feichter, J. 2009 https://doi.org/10.5194/acp-9-515-2009 eng eng Copernicus Atmospheric Chemistry and Physics--Atmos. Chem. Phys.--journals:265--1680-7316--1680-7324 eawag:5982 journal id: journals:265 issn: 1680-7316 e-issn: 1680-7324 ut: 000263325700011 local: 13446 scopus: 2-s2.0-76049101925 doi:10.5194/acp-9-515-2009 Text Journal Article 2009 fteawag https://doi.org/10.5194/acp-9-515-2009 2024-08-05T03:04:28Z 10 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 stratospheric, 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 geomagnetic minimum. The present 10 Be production rate is 4–5 times higher at high latitudes than in the tropics whereas during 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 confirmed by the fact that the contribution of 10 Be produced in the stratosphere is dominant (55%–70%) and relatively constant 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. Article in Journal/Newspaper Antarc* Antarctica Greenland DORA Eawag Atmospheric Chemistry and Physics 9 2 515 527 |
institution |
Open Polar |
collection |
DORA Eawag |
op_collection_id |
fteawag |
language |
English |
description |
10 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 stratospheric, 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 geomagnetic minimum. The present 10 Be production rate is 4–5 times higher at high latitudes than in the tropics whereas during 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 confirmed by the fact that the contribution of 10 Be produced in the stratosphere is dominant (55%–70%) and relatively constant 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. |
format |
Article in Journal/Newspaper |
author |
Heikkilä, U. Beer, J. Feichter, J. |
spellingShingle |
Heikkilä, U. Beer, J. Feichter, J. Meridional transport and deposition of atmospheric 10 Be |
author_facet |
Heikkilä, U. Beer, J. Feichter, J. |
author_sort |
Heikkilä, U. |
title |
Meridional transport and deposition of atmospheric 10 Be |
title_short |
Meridional transport and deposition of atmospheric 10 Be |
title_full |
Meridional transport and deposition of atmospheric 10 Be |
title_fullStr |
Meridional transport and deposition of atmospheric 10 Be |
title_full_unstemmed |
Meridional transport and deposition of atmospheric 10 Be |
title_sort |
meridional transport and deposition of atmospheric 10 be |
publisher |
Copernicus |
publishDate |
2009 |
url |
https://doi.org/10.5194/acp-9-515-2009 |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_relation |
Atmospheric Chemistry and Physics--Atmos. Chem. Phys.--journals:265--1680-7316--1680-7324 eawag:5982 journal id: journals:265 issn: 1680-7316 e-issn: 1680-7324 ut: 000263325700011 local: 13446 scopus: 2-s2.0-76049101925 doi:10.5194/acp-9-515-2009 |
op_doi |
https://doi.org/10.5194/acp-9-515-2009 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
9 |
container_issue |
2 |
container_start_page |
515 |
op_container_end_page |
527 |
_version_ |
1810289406609719296 |