As I am not familiar with ECMWF data. I have obtained daily Climate Reanalysis data from ECMWF ERA-Interim. I have converted it to the text file and excel file format. The data obtained for various parameters are as follow;
Temperature, Min, Max Temp. Solar radiation, DewPoint Temp, SnowDepth (Time:12 Step: 03), Precipitation (Time: 00 & 12 Step: 12), Sunshine duration(Time: 00 & 12 Step: 09).
The required input file format of the model, for example, is as;
Year--day--Temp--Prec--SRD--Daylength
2011--01---
2011--02---
2011--03---
---
---
2011--365---
2012--1---
2012--2---
---
2012--365--- and so on.....
The data obtained is not on daily format rather is a lot of data on time basis.
Would anybody help how to process this data to get daily data from day 1 to day 365 per year for each parameter?
Your guidance/help in this regard will highly be appreciated.
Thank you and regards,
Dear Arshad Ali Shedayi,
I am not able to get your objective properly, but as per my understanding, I can guide you about ECMWF especially ERA-interim datasets.
First, you have to know about the entities involved in the ECMWF data.
ECMWF data contains both instantaneous as well as accumulated (flux) parameters.
Now when you use any instantaneous parameters like temperature, dew point temp etc. You will have the value of that parameter at selected time, but in flux parameter, you will have accumulated value from your forecast start. Additionally, for instantaneous parameter, you can start your forecast from four different times (0,6,12,18) and you can select any of the forecast step (0,3,6,9,12), but for accumulated parameter, you can start your forecast only for two-time (0 and 12) and you will have step options (3,6,9,12) but you can not able to get accumulated parameter on instantaneous time because accumulated means from some time to some time. It means from 0-hour to 3-hour, where instantaneous means at 0-hour or at 3-hour.
Example.
Temperature:-
Temp is instantaneous value so you will get this at any time
Precipitation:-
Prec. has accumulated means you will get accumulated value between two times.
Now when you select the temperature and start your forecast with 0-hour and 12-hour with forecast step-3 than actually, you are running your model with available measurements at 0-hour and 12-hour and you are forecasting for 3-hours and 15 hours. So you will have temperature value at 3-hour and 15-hour.
Whereas, when you select precipitation for 0-hour and 12-hour with step 3. It means same as above you start your model at 0-hour and 12-hour with available measurements but you are having accumulated values for 0 to 3 hours and 12 to 15 hours. it means you have three three hours accumulated values of precipitation and you can not simply compare this accumulated values with instantaneous values. It is not that simple to work with this.
Hope I am able to make sense about the ECMWF data.
Thank you
With Regards
Piyush Patel
please thoroughly go through the reanalysis website.
everything is given there.
Hi,
From the text in yr question, it seems that you have two data of precipitation and two data of sunshine duration (time 00 & 12).
In my opinion, daily precipitation should be the accumulation of those two data. So you need to sum those two data to get the daily value.
Not sure for sunshine duration.
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