Roy,
No problems there. We are just using the slashes as shorthand for
x_wind_gust and y_wind_gust. (Saves a few characters.)
Jim
On 5/27/14, 10:30 AM, Lowry, Roy K. wrote:
>
> Hi Jim,
>
> Standard Names get built into URLs. I would therefore recommend that
> they do not include slashes!
>
> Cheers, Roy.
>
> Please note that I now work part-time from Tuesday to Thursday. E-mail
> response on other days is possible but not guaranteed!
>
> *From:*Jim Biard [mailto:jbiard at cicsnc.org]
> *Sent:* 27 May 2014 15:23
> *To:* cf-metadata at cgd.ucar.edu
> *Subject:* Re: [CF-metadata] Request for new standard-names: graupel,
> wind_gust, inland_water_area_fraction
>
> Heiko,
>
> I can see that. How about x/y_of_wind_gust? Wind of gust is a peculiar
> construction for English. I'd be in favor of either x/y_of_wind_gust
> or x/y_wind_gust.
>
> Jim
>
> On 5/26/14, 11:06 AM, Heiko Klein wrote:
>
> Hi Jim,
>
> while gust and wind gust are synonyms, wind gusts are immediately
> understood (and have 680.000 hits on google), while gust alone
> would leave me puzzled a while until I understand the context (and
> google will find a lot of people with the name Gust, but no wind).
>
> With the definition of wind from x_wind: "Wind is defined as a
> two-dimensional (horizontal) air velocity vector", I don't see so
> much redundancy in wind_of_gust. I'm quite ambivalent though about
> "x/y_wind_of_gust" or "x/y_wind_gust".
>
> Heiko
>
> On 2014-05-23 14:43, Jim Biard wrote:
>
> Hi.
>
> Wind_of_gust is weirdly redundant. How about x_gust and y_gust?
>
> Jim
>
> On 5/23/14, 5:15 AM, Heiko Klein wrote:
>
> Dear John, Jonathan and Karl,
>
> thank you for your feedback.
>
>
> x_wind_[speed_]of_gust
> I like best x_wind_of_gust, since x_wind is a vector-component of a
> velocity, so it is not a pure speed, and neither a pure direction. I
> think it should be as close to x_wind as possible - though I see the
> point of eventually changing x_wind in the future.
>
> In AROME, wind-gusts are parametrized in a different way than a pure
> statistical extraction, so cell_method: time: max would be wrong
> here.
>
>
> graupel_fall_amount
> That is fine with us.
>
>
> inland_water_area_fraction
> I like the definition of wikipedia for sea:
> "The sea is the connected body of salty water that covers over 70
> percent of the Earth's surface."
> The border between 'river-delta' and the sea might be very difficult
> to define, though. It might be an idea to add this definition to
> sea_area_fraction.
>
> We use the area_fraction + type for soil-types. Since we use already
> sea_area_fraction and land_area_fraction, inland_water_area_fraction
> feels like a logical continuation of the division in land and water.
>
>
> Best regards,
>
> Heiko
>
> On 2014-05-22 20:03, John Graybeal wrote:
>
> Karl,
>
> I've wondered about this 'gust' question myself, with respect to
> wind_speed_of_gust, and to many other names with statistical
> components
> (mean, st_dev, minimum, etc.). I've always assumed that this either
> reflected (a) convenience, or (b) the reality that many sensors
> return
> data that is already parameterized (?), and so the characteristics
> required for cell methods might not be readily captured.
>
> I would appreciate hearing further clarification of the CF
> principles in
> these cases. (Can be added to the FAQ!)
>
> John
>
>
> On May 22, 2014, at 09:48, Karl Taylor <taylor13 at llnl.gov
> <mailto:taylor13 at llnl.gov>
> <mailto:taylor13 at llnl.gov> <mailto:taylor13 at llnl.gov>> wrote:
>
>
> Hi Heiko et al.,
>
> I agree that if we include the "gust" name, it should include "speed"
> as in x_wind_speed_of_gust (for consistency with previous name).
>
> Alternatively, I'm not sure wind_speed_of _gust should ever be used
> when referring to observations or in many models, since it's just the
> maximum wind speed occurring during an interval, and it's not a
> different quantity from wind speed itself. If the
> x_wind_speed_of_gust is some parameterized quantity and can't be
> obtained from the x_wind time series (sampled at model time-step),
> then there might be an argument for defining a new standard_name.
>
> best regards,
> Karl
>
>
> On 5/22/14, 9:27 AM, John Graybeal wrote:
>
> Hello Heiko, thanks for the requests.
>
> Re x|y_wind_gust, for consistency with existing names would
> x_wind_speed_of_gust and y_wind_speed_of_gust be OK, for
> consistency with the existing name wind_speed_of_gust?
>
> The description of graupel should be included in this definition.
> For example "Graupel is precipitation that forms when supercooled
> droplets of water are collected and freeze on a falling snowflake,
> forming a 2--5 mm (0.079--0.197 in) ball of rime." Stolen from
> wikipedia, you may have better/preferred language.
>
> Re the name graupelfall_amount, my web search found only uses that
> treat graupel as a separate word (except in German), so is
> graupel_fall_amount acceptable? I know it doesn't match the
> existing snowfall/rainfall etc., but those are common English words.
>
> For inland_water_area_fraction, I don't know how to interpret
> 'inland water ... is all water-surfaces which are not "sea" '. Are
> bays, fjords, etc. inland water? Is there a clear transition at the
> river delta of which part is inland and which is not? For CF this
> may not be essential, but if the answers are well known it would be
> helpful to state them. (And if not, maybe just say something like
> 'inland water does not include any ocean or sea'.)
>
> John
>
> On May 22, 2014, at 01:10, Heiko Klein<Heiko.Klein at met.no>
> <mailto:Heiko.Klein at met.no> wrote:
>
>
> Hi,
>
> we're currently converting the AROME model output to netcdf and
> have problems finding good standard_names for some of the
> parameters. Therefore, we would like to request the following new
> standard_names:
>
> x_wind_gust:
> definition: "x" indicates a vector component along the grid
> x-axis, positive with increasing x. Wind is defined as a
> two-dimensional (horizontal) air velocity vector, with no vertical
> component. (Vertical motion in the atmosphere has the standard
> name upward_air_velocity.)
> A gust is a sudden brief period of high wind speed. In an observed
> timeseries of wind speed, the gust wind speed can be indicated by
> a cell_methods of maximum for the time-interval. In an atmospheric
> model which has a parametrised calculation of gustiness, the gust
> wind speed may be separately diagnosed from the wind speed.
> units: m/s
>
> y_wind_gust:
> (see x_wind_gust. The definition is taken from the existing x_wind
> and wind_speed_of_gust)
>
>
>
> graupelfall_amount:
> definition: "Amount" means mass per unit area.
> units: kg m-2
>
>
> inland_water_area_fraction:
> definition: "X_area_fraction" means the fraction of horizontal
> area occupied by X. "X_area" means the horizontal area occupied by
> X within the grid cell. "inland_water" is water surrounded by
> land-masses like rivers and lakes, and is all water-surfaces which
> are not "sea".
>
>
> Best regards,
>
> Heiko
> (on behalf of the MET Norway Arome team)
>
>
>
> --
> Dr. Heiko Klein Tel. + 47 22 96 32 58
> Development Section / IT Department Fax. + 47 22 69 63 55
> Norwegian Meteorological Institutehttp://www.met.no
> P.O. Box 43 Blindern 0313 Oslo NORWAY
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>
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> ------------------------------------
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> Marine Data Manager
>
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> skype: graybealski
> Marinexplore
> 920 Stewart Drive
> Sunnyvale 94085
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Received on Tue May 27 2014 - 08:44:42 BST
