View source for ASP lab response case: 23 June 2008

==Introduction==
Several data fields from a CSU-CHILL RHI scan through a thunderstorm are shown below. A few questions are listed below the polarimetric data field plots. Please submit your answers as an e-mail with a subject of "23 June 2008" sent to:

asp@chill.colostate.edu

NOTE: You may complete your responses and send the e-mail outside of the basic polarization lab period.

For general reference, here is the basic reflectivity (Zh) data from the storm: 
[[Image:23jun2008 rhi dbz.png]]
==Differential Reflectivity (Zdr)==
[[Image:23jun2008 zdr th anot.png]]
1.) Based on the reflectivity and differential reflectivity data, what is the dominant form of precipitation at the points marked in the Zdr plot?

1a:

1b:

1c:

2.) Consider the vertical profile of Zdr along the vertical line marked as point 2 in the Zdr image. What is the probable cause of the locally positive Zdr layer located near the 2 km AGL height line?

2: 
==Differential Propagation Phase (Phidp)==
[[Image:23jun2008 phi 5km.png|630px]]

3a.) Over what range interval does the greatest phidp change take place?

3a:

3b.) The presence of what hydrometeor type is causing this increasing lag between the H and V return signals?

3b:
==Co-polar Correlation between the H and V Returned Signals (RhoHV)==
[[Image:23jun2008 rhi rho anot.png]]

The correlation field has a local relative minimum of ~0.95 at the point marked.

4. What precpitation composition is probably responsible for this?

4: 
==Linear Depolarization Ratio (LDR)==
[[Image:23jun2008 ldr th anot.png]]
5a: A local maximum (~-23 dB) in linear depolarization is seen at point 5a. What hydrometeor type is responsible for this?

5a:

5b: There is also a general tendency for the LDR values to become large in the more didtant and/or weaker reflectivity portions of the echo. (Point 5b for example). Why should the LDR values tend to increase in these areas?

5b:


Remember: Submit your responses to questions 1 - 5b to [mailto:asp&#64;chill&#46;colostate&#46;edu?subject=23%20June%202008 asp@chill.colostate.edu] with the subject line "23 June 2008".