Be-10 measured in a GRIP snow pit and modeled using the ECHAM5-HAM general circulation model

• Published in: Geophysical Research Letters
• Main Authors: Heikkilä, U., Beer, J., Jouzel, J., Feichter, J., Kubik, P.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2008
• Subjects: Greenland; Greenland ice core; Greenland Ice core Project; GRIP; ice core
• Online Access: http://hdl.handle.net/11858/00-001M-0000-0011-F9EA-0; http://hdl.handle.net/21.11116/0000-0007-F7DB-C

Be-10 measured in a Greenland Ice Core Project (GRIP) snow pit (1986-1990) with a seasonal resolution is compared with the ECHAM5-HAMGCMrun. Themeanmodeled Be-10 concentration in ice (1.0.10(4) atoms/g) agrees well with the measured value (1.2.10(4) atoms/g). The measured Be-10 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 -31 degrees C estimated from delta O-18 is lower than the temperature measured at a near-by weather station (-29 degrees C) and the modeled temperature (-26 degrees 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.