Subject: Note from Rich Zurek re: theta surfaces

From: [email-masked] (David Winningham)
Date: Mon, 23 Nov 92 10:08:58 CST

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>From "UARS::ERICKSON"@PEM.space.swri.edu Mon Nov 23 10:04:32 1992
Date:    Mon, 23 Nov 1992 16:03:35 GMT
From: "UARS::ERICKSON"@PEM.space.swri.edu (Tom Erickson (301) 286-9202)
Subject: Note from Rich Zurek re: theta surfaces
To: [email-masked]
X-Vmsmail-To: @PI1$DISK:[REBER]PI1.DIS
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From:	SMTP%"[email-masked]" 18-NOV-1992 18:48:53.50
To:	[email-masked]
CC:	
Subj:	Isentropic (Theta) Levels for UARS Campaign/Workshop

Date: Wed, 18 Nov 92 10:47:28 PST
From: [email-masked] (R.W.Zurek)
Message-Id: <[email-masked]>
To: [email-masked]
Subject: Isentropic (Theta) Levels for UARS Campaign/Workshop
Cc: [email-masked]

Skip,

We would like to facilitate intercomparisons on potential temperature
surfaces for the upcoming "campaign" by reminding the teams of the list
of theta levels that were presented at the March, 1992, Science Team Meeting.
Would you please send the message included below out to the various PIs?
Also, could we get a copy of your PI.DIS list for reference?

Thanks,

Rich Zurek
Gloria Manney
Joe Waters

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Dear UARS Colleague,

In the upcoming "Campaign Mode" study, many investigators will 
be examining data on isentropic (constant potential temperature, 
theta) surfaces. We remind you that a set of theta surfaces 
corresponding to UARS pressure levels was presented to the UARS 
Science Team at the March, 1992 meeting (see Science Team Notes). 
These surfaces have been used at JPL since launch, both to 
intercompare conventional meteorological fields and associated 
derived products and to investigate chemical specie distributions
(e.g., ClO) obtained by MLS; these theta values are also used by 
other UARS teams.  

We have found this choice of theta surfaces to be very useful, and 
it will greatly facilitate comparisons if we use the same levels 
when working on common problems. Let us know which of these 
theta levels you feel are most appropriate to use for detailed 
presentation and intercomparison in your areas of investigation.  

A list of the theta surfaces follows, as well as a decription
of how they were defined, and the UARS pressure levels to which they 
correspond. (This material is the same as in the notes for the March 1992 
Science Team meeting.)

Rich Zurek	[MLSRAC::ZUREK]
Gloria Manney	[MLSRAC::MANNEY]
Joe Waters
_______________________________

	POTENTIAL TEMPERATURE LEVELS FOR UARS PRESSURE LEVELS

For each UARS pressure level, a corresponding constant potential 
temperature (theta) level is defined using climatological temperatures
(Fleming, et al.,1988). Values obtained from temperatures on 
the UARS pressure levels at 50N for January, 50S for July, 
50N for April, and 50S for October are averaged together. "Nice" 
values are obtained by rounding to three significant figures, 
with the last significant figure being either 0 or 5.   

           level #     pressure (mb)     theta (K)
           ________________________________________

             0           1000.             280
             1           681.3             290
             2           464.2             300
             3           316.2             315
             4           215.4             340
             5           146.8             375
             6           100.0             420
             7           68.13             465
             8           46.42             520
             9           31.62             585
            10           21.54             655
            11           14.68             740
            12           10.00             840
            13           6.813             960
            14           4.642            1100
            15           3.162            1300
            16           2.154            1450
            17           1.468            1700
            18           1.000            1900
            19          0.6813            2100
            20          0.4642            2300
            21          0.3162            2500
            22          0.2154            2700
            23          0.1468            2950
            24          0.1000            3250
            25          0.0681            3550
            26          0.0464            3950
            27          0.0316            4300
            28          0.0215            4700
            29          0.0147            5150
            30          0.0100            5650

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