Chemistry of polar ice (part II). S & N cycles from ice core studies Robert DELMAS . YESTERDAY. Chemical information is located in the ice matrix itself Basic features of glaciochemistry soluble vs insoluble ion balance Primary aerosol species
together with MSA
Continuous or sporadic
Tropospheric pathway (South America)
Antarctic volcanoesnssSULFATEORIGINS FOR CENTRAL ANTARCTICA
In glacial conditions:
an additional source
(e.g. gypsum: CaSO4)?
A tool to differentiate origins:
S & O isotope measurements
(investigated by O isotope measurements)
1 Heterogeneous phase:
SO2 + O3/H2O2 growth of existing aerosol particle, in particular sea salt
SO2 + OH new aerosol particle
Alexander, B., J. Savarino, N.I. Barkov, R.J. Delmas, and M.H. Thiemens, 2002
Alexander, B., M.H. Thiemens, J. Farquhar, A.J. Kaufman, J. Savarino, and R.J. Delmas,2003
10Be is attached to background aerosol
Tambora period (1800-1820)
1259 AD eruption: sulfate and fluoride
El Niño events ?
Are this data reliable?
Dronning Maud Land