Ge103 Lecture May 10 2005 Yuk Yung x6940; yly@gps.caltech.edu Trace Gases Ge103 Lecture May 10 2005 Yuk Yung x6940; yly@gps.caltech.edu

Dictionary Atmosphere = 1. 82x1020 moles = 5 Dictionary Atmosphere = 1.82x1020 moles = 5.27x1018 Kg 1 Tg yr-1 = 109 kg yr-1 = 3.4 x1010 moles yr-1 M = 29

Caltech/JPL 2-D model of the atmosphere January, 60˚ to 70˚ north CH4 Current H2 Model elevated H2 Data shown as * and + are SOLVE balloon measurements for H2 and CH4, respectively

Variations in H2 concentration with time and location

Familiar natural sources of H2 Fires Volcanoes Beasts Rocks

The global atmospheric H2 budget based on concentration records and inventory estimates

Stratospheric water vapor predicted for 2 ppm tropospheric H2 % increase over current Solid lines contour ppmv H2O vapor