Relation of Na+ concentration and δ18O in winter precipitation with weather conditions

Details Relation of Na+ concentration and δ18O in winter precipitation with weather conditions Relation of Na+ concentration and δ18O in winter precipitation with weather conditions

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..591s&link_type=abstract

Geophysical Research Letters, Volume 22, Issue 5, p. 591-594

Physics

1

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Geochemical Cycles, Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere

Scientific paper

A chemical study of the winter precipitation was conducted in Tohkamachi, central Japan. The ratios of Ci-/Na+ and Mg2+/Na+ found in the winter precipitation samples are nearly equal to those of sea water. This result suggest that Na+/Mg2+, and Cl- found in the winter precipitation are originated from sea water. A relationship was determined between the Na+ concentration in the winter precipitation sample and the height of the convective mixing layer. Cloud droplets containing sea salt particles are believed to be captured by snow crystals through the rain-out process. The results indicate that the higher the convective mixing layer heights, the larger the amount of sea salt particles captured by the snow crystals. A relationship betwen the δ18O values in the winter precipitation and the air temperature at the top of convective mixing layer was determined for several synoptic weather conditions that produced winter precipitation. The δ18O values in samples collected under conditions of winter monsoon are larger than those under other weather conditions at the same temperature. A good relationship is observed between the temperatures at the top of convective mixing layer and the δ18O of samples of winter precipitation under conditions of the winter monsoon.

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