ER-2Earth Resources-2 Satellite
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When incorporated into computer models, such reactions lead to lower-than-expected levels of [NO.sub.x] and higher-than-expected levels of CIO -- the same relationship discovered by the ER-2.
ER-2 flights as far south as the Caribbean detected CIO in the range of 0.1 ppb -- five times the amount scientists expected.
The stratosphere also holds far less hydrochloric acid -- a safe form of chlorine -- than expected, ER-2 observations indicate.
Pinatubo last June spewed additional sulfur into the stratosphere and has enhanced ozone deterioration, this process went on before the eruption, according to ER-2 measurements made outside the volcanic debris.
The ER-2 flights also passed through thin horizontal sheets of enhanced CIO, which appeared over the temperate latitudes as far south as the Caribbean.
That's because both Daedalus and high-flying jet planes such as the ER-2 confront the same basic problem: not enough air.
Jet airplanes such as the ER-2 face different problems.
On many of its research missions, the single-engine ER-2 has ventured into remote and risky territory.
ER-2 expeditions to the Arctic have already detected some ozone loss during winter (SN: 3/24/90, p.183).
Because the ER-2 only gathered data on a few days, researchers remain unsure whether the chlorine monoxide elevations last for any length of time.
The ER-2 data leave researchers puzzling over the compound's origin.
In the same issue of GEOPHYSICAL RESEARCH LETTERS, she and her colleagues describe computer simulations suggesting that the ER-2's February flights passed through polar air enriched with chlorine monoxide.