Movie: Hourly NE Ozone and Back Trajectories from 8/23-28, 1992

Description:

This is a comparison of measured ozone in the Northeast (left), with back-trajectories (right) during August 23-28, 1992. The bottom left time chart shows the ozone pattern at Albany, NY (solid line) and at Adams in northwestern Massachusetts. The model is the same as in 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 (left 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:

The ozone pattern in the Albany, NY time chart displays a strong diurnal cycle indicative of the influences from local sources. Adams, MA, is highly influenced by ozone being transported to this area as shown by the lack of a strong ozone diurnal cycle.

During the time period June 23 - 28, the maximum ozone concentrations along the New England coast often exceeded 120 ppb. The airmasses associated with these concentrations traveled over the Industrial Midwest, and the megalopolis extending from New York City to Washington DC. In the northern parts of New England, the ozone concentrations were low, generally <80 ppb, and these airmasses traveled north of the other airmasses generally passing through the Great Lake region and Canada.

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