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MARS stands for Meteorological Archive System. MARS is the ECMWF archival system which handles the requests that are submitted externally through the Web-API

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MARS stands for Meteorological Archive and Retrieval System. MARS is the ECMWF archival system which handles the requests that are submitted externally through the Web-API.
A MARS request is basically a request for retrieving data from MARS using a specific language
For more information about MARS you may visit the MARS user documentation.
An easy way to create your own MARS request is by using our Datasets Web Interface .by using the web interfaces: How to check the content of the archive - Web API FAQ
Make some selections and click on "View the MARS request". The system will automatically translate your selections to a MARS request.
This request can be used as a pilot to build your WebAPI Web API script.

In the case of ERA Interim an example could be:

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Code Block

language	py
title	era-interim.py

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer
   
server = ECMWFDataServer()
   
server.retrieve({
    'stream'    : "oper",
    'levtype'   : "sfc",
    'param'     : "165.128/41.128",
    'dataset'   : "interim",
    'step'      : "0",
    'grid'      : "0.75/0.75",
    'time'      : "00",
    'date'      : "2013-09-01/to/2013-09-30",
    'type'      : "an",
    'class'     : "ei",
    'target'    : "interim_2013-09-01to2013-09-30_00.grib"
})

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Code Block

title	era-interim.mars

retrieve,
   stream=oper,
   levtype=sfc,
   param=165.128/41.128,
   dataset=interim,
   step=0,
   grid=0.75/0.75,
   time=00,
   date=2013-09-01/to/2013-09-30,
   type=an,
   class="ei",
   target="interim_2013-09-01to2013-09-30_00.grib"

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