Stratospheric versus pollution influences on ozone at Bermuda:

• Main Authors: Reconciling Past Analyses, Qinbin Li, Daniel J. Jacob, T. Duncan Fairlie, Hongyu Liu, All V. Martin, Robert M. Yantosca
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2002
• Subjects: North Atlantic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.58.3520; http://research.nianet.org/~hyl/./publications/Li_etal_Bermuda_O3.2002.pdf

l reproduce the previously reported subsidence associated with high-ozone events. Even in the free troposphere, we find that the stratosphere contributes less than 5 ppbv (<10%) to spring ozone over Bermuda. Positive O 3 - Be and negative O 3 - Pb correlations observed at Tenerife (28#N, 16#W, 2.4 km) in summer are reproduced by the model and are consistent with a middletropospheric source of ozone, not an upper tropospheric or stratospheric source as previously suggested. A regional budget for the North Atlantic in spring indicates that the stratosphere contributes less than 10 ppbv ozone (<5%) below 500 hPa, while the lower troposphere contributes 20 -- 40 ppbv ozone throughout the troposphere. INDEX TERMS: 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 0345 Atmospheric Composition and Structure: Pollution---urban and regional (0305); 0365 Atmospheric Composition and Structure: Troposphere---composition and chemistry; 0368 Atmospheric Comp