TY  - JOUR
AB  - Heterogeneous ice freezing points of aqueous solutions containing various immersed solid dicarboxylic acids (oxalic, adipic, succinic, phthalic and fumaric) have been measured with a differential scanning calorimeter. The results show that only the dihydrate of oxalic acid (OAD) acts as a heterogeneous ice nucleus, with an increase in freezing temperature between 2 and 5 K depending on solution composition. In several field campaigns, oxalic acid enriched particles have been detected in the upper troposphere with single particle aerosol mass spectrometry. Simulations with a microphysical box model indicate that the presence of OAD may reduce the ice particle number density in cirrus clouds by up to ~50% when compared to exclusively homogeneous cirrus formation without OAD. Using the ECHAM4 climate model we estimate the global net radiative effect caused by this heterogeneous freezing to result in a cooling as high as −0.3 Wm−2.
DA  - 2006
DO  - 10.5194/acp-6-3115-2006
LA  - eng
IS  - 10
M2  - 3115
PY  - 2006
SN  - 1680-7316
SP  - 3115-3129
T2  - ATMOSPHERIC CHEMISTRY AND PHYSICS
TI  - Oxalic acid as a heterogeneous ice nucleus in the upper troposphere and its indirect aerosol effect
UR  - https://nbn-resolving.org/urn:nbn:de:0070-pub-15985020
Y2  - 2024-11-24T20:28:09
ER  -