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

[Jonas Roberts]

Thanks Melissa and Bill, you have been most helpful.

Cheers,
Jonas


On Fri, Feb 1, 2013 at 4:41 PM, Gutowski, William J [GE AT] <
gutowski at iastate.edu> wrote:

> 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
>
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> http://www.ge-at.iastate.edu
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>
>
>
>
>
>
>
>
> 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:
> >>
> >>     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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