So despite adding CCNs into the air with high humidity, we didn't make fog. We went back to the drawing board to see what else can help us figure out fog, especially since we have some really insightful questions on the DQB...like
"How do CCNs get into the air?"
AND
"How does water actually condense on a CCN?"
We don't really know where to go, but one factor that has been looming in the background is related to temperature.
"How do CCNs get into the air?"
AND
"How does water actually condense on a CCN?"
We don't really know where to go, but one factor that has been looming in the background is related to temperature.
We know that for water to "clump" together it has to get cooler like it did as it got farther away from the humidifier. We also wanted to see if we saw any temperature changes with each of the cities we investigated early on that experienced fog. And for every city, a trend began to appear that before the fog appeared, the temperature began to drop. In some cities, there was a BIG drop in temperature, like by more than 10 degrees Fahrenheit. In other cities there was a much SMALLER drop, but it was still a drop by like 2 degrees Farenheit. We also saw that when the fog disappeared, we saw an increase in temperature (again, but varying amounts, but still an increase).
We've got some questions about temperature's role with fog (especially since we don't think there's an "ideal" temperature for fog since it appears in cities with VERY different average temperatures (think Ashland, WI and Orlando, FL). So we decided our next steps should be to investigate what happens to substances when they are heated and cooled, and we'd start with water since that's obviously needed for fog.
M
We've got some questions about temperature's role with fog (especially since we don't think there's an "ideal" temperature for fog since it appears in cities with VERY different average temperatures (think Ashland, WI and Orlando, FL). So we decided our next steps should be to investigate what happens to substances when they are heated and cooled, and we'd start with water since that's obviously needed for fog.
M