[RegCNET] how to find out monthly mean precipitation....

[Syed Ahsan Ali]

RegCM output is 3-hourly mm/day so your need to multiply by b to get daily
precipitation in mm/day.

On Mon, Aug 27, 2012 at 2:50 PM, Kishore Babu <kishoreragi at gmail.com> wrote:

> Dear Syed Ahsan,
>
> ya.. I understood that my explanation is something wrong, but, solution is
> right because RegCM precipitation is x mm/day even though it is just for
> mm/3h only. If it is mm/day, for every values , it must be total/8days, not
> for per one day. To make to mm/day , we need to multiply with 1/8 and have
> to sum up all upto total vales of a month.
>
> Hence, solution is sum(tpr/8, t=1,t=240)
>
> Could you please reply?  I have been looking retrospectively. tpr/8 is
> giving reasonable value to climate observation.
>
> Thanking you,
>
> Kishore
>
>
> On Mon, Aug 27, 2012 at 11:47 AM, Syed Ahsan Ali <ahsanshah01 at gmail.com>wrote:
>
>> It should be sum(tpr*8,t=1, t=240)
>>
>>
>> On Mon, Aug 27, 2012 at 11:01 AM, Kishore Babu <kishoreragi at gmail.com>wrote:
>>
>>> Dear users,
>>>
>>> I am not so sure but, I am thinking that it might be the solution. RegCM
>>> will produce precipitation data for every 3hours, but the units are mm/day.
>>> I hope it should be mm/3h or must be made to mm/day. To make it mm/day, we
>>> have to multiply with 1/8, ie mm/3h *1/8 = mm/24h= mm/day.
>>>
>>> First 8 values of RegCM for example a mm/day+b mm/day +c mm/day + d
>>> mm/day + e mm/day + f mm/day +g mm/day h mm/day = (a+b+c+d+e+f+g+h) mm/day
>>>
>>> And the same is true for rest of every 8 values in the month. Hence, the
>>> solution for the mean monthly precipitation is sum(tpr,t=1, t=240)/8 . the
>>> number 240 may change depending on the number of days in a month.
>>>
>>> GrADS code might be the following for monthly mean precipitation
>>>
>>> 'define precip =sum(tpr, t=1,t=240)/8'
>>> 'd precip'
>>>
>>>
>>> Hope this might be the solution. Could anyone please let me confirm if
>>> it is right?
>>>
>>> Looking forward to getting reply.
>>>
>>>
>>> Best regards,
>>>
>>> Kishore
>>>
>>> PhD student
>>>
>>>
>>> On Sun, Aug 26, 2012 at 3:32 PM, Syed Ahsan Ali <ahsanshah01 at gmail.com>wrote:
>>>
>>>> You can do it using CDO, or just use grads avg function.
>>>>
>>>>  On Thu, Aug 23, 2012 at 4:59 PM, Kishore Babu <kishoreragi at gmail.com>wrote:
>>>>
>>>>>  Dear RegCM users,
>>>>>
>>>>> Could anyone please help me with the GrADS command to calculate
>>>>> monthly mean precipitation in mm/mn ?
>>>>>
>>>>> Thank you in advance,
>>>>>
>>>>> Sincerely,
>>>>>
>>>>> Kishore
>>>>>
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Syed Ahsan Ali Bokhari
>>>> Electronic Engineer (EE)
>>>>
>>>> Research & Development Division
>>>> Pakistan Meteorological Department H-8/4, Islamabad.
>>>> Phone # off  +92518358714
>>>> Cell # +923155145014
>>>>
>>>>
>>>
>>
>>
>> --
>> Syed Ahsan Ali Bokhari
>> Electronic Engineer (EE)
>>
>> Research & Development Division
>> Pakistan Meteorological Department H-8/4, Islamabad.
>> Phone # off  +92518358714
>> Cell # +923155145014
>>
>>
>


-- 
Syed Ahsan Ali Bokhari
Electronic Engineer (EE)

Research & Development Division
Pakistan Meteorological Department H-8/4, Islamabad.
Phone # off  +92518358714
Cell # +923155145014
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