Movie: Hourly NE Ozone and Back Trajectories on 6/13/92

Description:

This is a comparison of measured ozone in the Northeast (right), with back-trajectories (left) during June 13-15, 1992. The monitoring data were extracted from the AIRS database, and the back trajectories were created using the CAPITA Monte Carlo.

Purpose:

The goal of the multi-view animation is to simultaneously present ozone and airmass history data during an ozone episode in New England. The airmass histories are to provide meteorological context to the interpretation of the ozone data.

Method:

The ozone data (right figure) were taken from the hourly ozone data stored in the AIRS database. The back trajectories were calculated using the CAPITA Monte Carlo model, and the Eulerian wind fields generated from the National Meteorological Centers Nested Grid Model, with 180 km resolution. Ten particles were released from each site at two hour time increments and tracked backwards for five days.

Interpretation:

During June 13, the ozone values could exceed 120 ppb in Connecticut and Massachusetts. The airmasses associated with these ozone values came from Canada, but stagnated over western Pennsylvania and northern Virginia. During June 14, the ozone concentrations in Connecticut and Massachusetts were again above 120 ppb, and the airmasses had traveled over the industrial Midwest and northern Virginia. The ozone concentrations in northern New York and Vermont were low, < 80 ppb. The air over this region is associated with a fast moving Canadian airmass.

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