[NARCCAP-discuss] narccap-discuss Digest, Vol 18, Issue 3

[Gutowski, William J [GE AT]]

The NARCCAP surface fluxes, including latent heat and evaporation, should
all be 3-hourly values and not instantaneous.  Another factor may be
whether the evaporation is from frozen water or liquid water.

Bill
-- 
William J. Gutowski, Jr.

3021 Agronomy Hall
Dept. of Geological & Atmospheric Sciences
Dept. of Agronomy
Iowa State University
Ames, Iowa  50011-1010

Tel:  1-515-294-5632
Fax: 1-515-294-2619
http://www.ge-at.iastate.edu
http://rcmlab.agron.iastate.edu








On 1/31/13 3:19 PM, "Melissa Bukovsky" <bukovsky at ucar.edu> wrote:

>Hi Jonas,
>
>Are they identical over water?  They should be.  If they're not over
>land by that percentage or more, then one may include transpiration and
>one may not.  It's also possible that one is instantaneous (this may be
>latent heat) and one is a 3-hour average (evps should be this way).
>
>Cheers,
>Melissa
>
>On 1/31/13 12:00 PM, narccap-discuss-request at mailman.ucar.edu wrote:
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>> Today's Topics:
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>>     1. Evaporation Variables (Jonas Roberts)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Thu, 31 Jan 2013 12:25:54 -0330
>> From: Jonas Roberts <jonaspmr at gmail.com>
>> Subject: [NARCCAP-discuss] Evaporation Variables
>> To: Discussion of NARCCAP data - uses and questions
>> 	<narccap-discuss at mailman.ucar.edu>
>> Message-ID:
>> 	<CALyA44CTSi+WBV5c=-CM0TtXF-WcPw37FLtYdjsStg_ehynL0w at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> Hello,
>>
>> I was hoping you could clarify exactly what the variable EVPS is
>> representing. The data tables online say it is the "Surface Evaporation
>>of
>> Condensed Water." Does this include transpiration from plants (ie. does
>>ot
>> represent the total evapotranspiration rate)?
>>
>> When I convert HFLS (Surface Latent Heat Flux) to evaporation rate I get
>> similar results to EVPS, though they are not identical (off by 5-10%).
>>
>> Is EVPS derived from HFLS directly, in which case my conversion is
>>slightly
>> off, or is there an inherent difference?
>>
>> Thanks for your time,
>>
>> Jonas Roberts
>> PhD Candidate
>> Faculty of Engineering and Applied Science
>> Memorial University of Newfoundland
>> j.roberts at mun.ca
>>
>>
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>> End of narccap-discuss Digest, Vol 18, Issue 3
>> **********************************************
>
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