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>> 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> 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
>>>>> _______________________________________________
>>>>> CF-metadata mailing list
>>>>> CF-metadata at cgd.ucar.edu
>>>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>>> ------------------------------------
>>>> John Graybeal
>>>> Marine Data Manager
>>>>
>>>> M +1 408 675-5445
>>>> skype: graybealski
>>>> Marinexplore
>>>> 920 Stewart Drive
>>>> Sunnyvale 94085
>>>> California, USA
>>>> www.marinexplore.com
>>>>
>>>> _______________________________________________
>>>> CF-metadata mailing list
>>>> CF-metadata at cgd.ucar.edu
>>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>>
>>>
>>>
>>> _______________________________________________
>>> CF-metadata mailing list
>>> CF-metadata at cgd.ucar.edu <mailto:CF-metadata at cgd.ucar.edu>
>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
>> ------------------------------------
>> *John Graybeal*
>> Marine Data Manager
>>
>> M +1 408 675-5445
>> skype: graybealski
>> Marinexplore
>> 920 Stewart Drive
>> Sunnyvale 94085
>> California, USA
>> www.marinexplore.com <http://marinexplore.com>
>>
>>
>>
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>>
>
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Received on Fri May 23 2014 - 06:43:44 BST
