Table of Contents
What is the objective of this page?
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To help users to improve S2S CMA MARS requests performance via the WebAPI.
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How is the S2S reforecast data organised in MARS?
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In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree:
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What would be the natural way to group requests?
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The idea is to request as much data as possible from the same tape file. The natural way to group requests would be:
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Best practise to iterate over all hindcastDates of several hindcastYears for CMA
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for hindcastYear in hindcastYears |
Web-API examples:
A CMA reforecast request for
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all the available hindcastDates
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Please note:
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#!/usr/bin/env python import calendar from ecmwfapi import ECMWFDataServer server = ECMWFDataServer() origin = "babj" modelVersionDate = "2014-05-01" def retrieve_cma_reforecast(): # This is""" the first model version for CMA (babj) hindcastDate = "2014-04-01" A #function Theto selecteddemonstrate hindcasthow date serverto = ECMWFDataServer() server.retrieve({ "class": "s2", iterate efficiently over all hindcastYears, hindcastMonths etc "dataset": "s2s", "date": modelVersionDate, for a "expver": "prod", particular cma_reforecast_request. "hdate": hindcastDate, "levtype": "sfc", Change the "origin": "babj", "param": "165/166", "step": "24/to/1440/by/24",variables below to adapt the iteration to your needs "stream": "enfh", "target": "data.pf.sfc", hindcastYearStart = 1994 hindcastYearEnd "time": "00", = 2014 hindcastMonthStart "number":= "1/2/3", hindcastMonthEnd "type": "pf", }) |
A CMA reforecast request for several hindcastDates
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#!/usr/bin/env python from ecmwfapi import ECMWFDataServer server = ECMWFDataServer() origin = "babj" modelVersionDate = "2014-05-01" def retrieve_data(hindcastDate,modelVersionDate,centre): target = "target_s2s_%s_%s.grb" % centre % hindcastDate server.retrieve({ = 12 for hindcastYear in list(range(hindcastYearStart, hindcastYearEnd + 1)): for hindcastMonth in list(range(hindcastMonthStart, hindcastMonthEnd + 1)): numberOfDays "class": "s2",= calendar.monthrange(hindcastYear, hindcastMonth)[1] "dataset": "s2s", for hindcastDay "date": modelVersionDate,in list(range(numberOfDays)): "expver": "prod", "hdate": hindcastDate, = '%04d%02d%02d' % ( "levtype": "sfc", "origin": centre, "param": "165", hindcastYear, hindcastMonth, hindcastDay + 1) "step": "0", "stream": "enfh", target = "target": target,%s%s.grb" % (origin, hindcastDate) "time": "00", "type": "cf", } cma_reforecast_request(hindcastDate, target) hindcastYearList = ["2012", "2013"] hindcastMonthList = ["08", "09"] hindcastDayList = ["01", "02"] for hindcastYear in hindcastYearList: for hindcastMonth in hindcastMonthList: for hindcastDay in hindcastDayList: hindcastDate = hindcastYear + hindcastMonth + hindcastDaydef cma_reforecast_request(hindcastDate, target): """ A CMA reforecast request. Change the keywords below to adapt it to your needs. """ server.retrieve({ "class": "s2", retrieve_data(hindcastDate) |
Some further help for setting the CMA hindcast dates
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for hindcastYear in"dataset": ["2012s2s", "2013date"]: modelVersionDate, for hindcastMonth in ["08expver",: "09prod"]: , "hdate": hindcastDate, if hindcastMonth in ["01levtype",: "03sfc", "05origin": origin, "07", "08param",: "10165/166", "12"]: hindcastDateEnd = "31" "step": "24/to/1440/by/24", if hindcastMonth in [ "04stream",: "06enfh", "09", "11"]: hindcastDateEnd = "30" "target": target, for hindcastDay in ["01" ... hindcastDateEnd ]: "time": "00", "number": "1/2/3", hindcastDate = hindcastYear+hindcastMonth+hindcastDay"type": "pf", }) if __name__ == '__main__': retrieve_cma_data(hindcastDate,"2014-05-01","babj") |
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reforecast() |
Useful links
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