Correction to “Tetrachloroethylene as an indicator of low Cl atom concentrations in the troposphere”

Abstract

This is correct for only a portion of the NH (90-30øN). For the entire NH this fraction is 98.7%. The anthropogenic C2C14 source distribution used in the model is resolved by 10 ø latitude bands, and corresponds to 91.9% (90-30øN), 6.8% (30-0øN), and 1.3% (0-90øS). All calculations in the paper are correct as reported.

Atmospheric Reaction of Cl with 4-Hydroxy-2-pentanone (4H2P): A Theoretical Study

“…The chemistry of Cl atoms plays an important role in the troposphere chemistry, particularly in the early morning in sea marsh, continental regions, and in the Arctic troposphere during springtime. Although the peak of Cl atom concentrations (10 3 to 10 4 atoms cm –3 ) is much lower than that of OH radicals (10 6 atoms cm –3 ), − the two reactions can compete with one another in areas where the chlorine atom concentration is sufficiently high because rate constants for the reactions of Cl with organics are generally 10 times higher than the corresponding OH rate constants …”

“…Despite the importance of HKs in atmospheric chemistry, very little information exists concerning their atmospheric fate, in particular, regarding their reaction with Cl atoms . Little information is available in the literature concerning the atmospheric fate of longer chain C4–C5 HKs. − Three experimental studies report rate constants for chemical reactions of C4–C5 HKs with atmospheric photooxidants − by using a relative rate technique …”