Figure 4.35 Contours of BrONO. abundance (pptv) for December. Values are from the Goddard two-dimensional climatological circulation model [731. Based on a model run to steady state using CFC and halon emission levels for 1990.

BrONO, to increase with altitude. In the upper half of the stratosphere the loss of BrONO, increases much faster than production, and Brv is no longer increasing with altitude, so the abundance of BrONO, decreases with altitude. Figure 4.36 shows a cross-section of the abundance of HOBr. As with BrONO-, the rapid increase in Br, with altitude causes the abundance of HOBr to increase with altitude. In the mid- and

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