Wednesday, August 19, 2009

Northward Movement of IWVF

Below are plots of aggregated IWVF, blue line, for three different domains within the NAM for 1983. The red line on each plot is the daily 80th percentile value for the specific domain. Domains are as follow:

Southern Arizona: 31 to 33 N
Northern Arizona: 33 to 35.5 N
Southern Utah: 35.5 to 38 N

Some of the events do show a northward progression, e.g., Day 55. But, overall, most events appear to show up on all domains on the same day, e.g., Day 100 and 78. The later is the event that I have used most frequently for case studies because it was shown to be one of the most substantial northward surge events in our study domain. Here, it appears to all happen on the same day but with a lessening intensity further north. An event on roughly Day 28 seems to work the reverse to this in that it is stronger the further north you go. Since this event is in June it could possible be more synoptically influenced rather than monsoon related. These subtle differences might be a good way to further classify events as "Strong" or "Weak."

Will do work on NARR and OBS DWPT correlation next.

-jamie

1 comment:

  1. The 80% values should be constant over the season. In other words we are looking for 80% values over the moonsoon season, not allowing seasonality to play into this. The way you've defined things, an event could occur in June that is far weaker than a non-event in say July. Pretty simple fix. Also, it would be nice to see a lead-lag correlation plot of IWVF, dewpt, and IWV for these regions.

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