10 Be measured in a GRIP snow pit and modeled using the ECHAM5-HAM general circulation model
International audience Be measured in a Greenland Ice Core Project (GRIP) snow pit (1986-1990) with a seasonal resolution is compared with the ECHAM5-HAM GCM run. The mean modeled 10 Be concentration in ice (1.0Á10 4 atoms/g) agrees well with the measured value (1.2Á10 4 atoms/g). The measured 10 Be...
Published in: | Geophysical Research Letters |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
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Subjects: | |
Online Access: | https://hal.science/hal-03108686 https://hal.science/hal-03108686/document https://hal.science/hal-03108686/file/2007GL033067.pdf https://doi.org/10.1029/2007GL033067 |
Summary: | International audience Be measured in a Greenland Ice Core Project (GRIP) snow pit (1986-1990) with a seasonal resolution is compared with the ECHAM5-HAM GCM run. The mean modeled 10 Be concentration in ice (1.0Á10 4 atoms/g) agrees well with the measured value (1.2Á10 4 atoms/g). The measured 10 Be deposition flux (88 atoms/m 2 /s) also agrees well with the modeled flux (69 atoms/m 2 /s) and the measured precipitation rate (0.67 mm/day) agrees with the modeled rate (0.61 mm/ day). The mean surface temperature of À31°C estimated from d 18 O is lower than the temperature measured at a nearby weather station (À29°C) and the modeled temperature (À26°C). During the 5-year period the concentrations and deposition fluxes, both measured and modeled, show a decreasing trend consistent with the increase in the solar activity. The variability of the measured and modeled concentrations and deposition fluxes is very similar suggesting that the variability is linked to a variability in production rather than the local meteorology. |
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