H2O2 and HCHO in Polar Snow and Their Relation to Atmospheric Chemistry

摘要: Our ability to infer past atmospheric concentrations of hydrogen peroxide (H2O2) and formaldehyde (HCHO) from measured in. polar firn ice cores is limited by our lack understanding the atmosphere-snow transfer functions for two species. Continuous H2O2 records going back into last century have been obtained Dye 3 Summit in central Greenland Siple west Antarctica, with some measurements preserved glaciation. HCHO also extend glaciation these same cores. Surface-snow pit studies clearly show that snow change days weeks after deposited. It thought buried layers reflect seasonal average values, mediated amount pattern water accumulation temperature. Observed surface air at Summit, summer are about 3–4 times those predicted photochemical modeling; evaporation may explain discrepancy. Development process models phase exchange essential interpreting core terms trends oxidizing power atmosphere.