Control for aircraft data denial study

Title Control for aircraft data denial study
Description Control (i.e. all usual observation types assimilated) for aircraft Observing System Experiment (OSE) see Ingleby et al (2021), https://doi.org/10.1029/2020GL090699 . Experiment from 2019-01-28 to 2019-04-30, also used for 'atmospheric river' tests.
DOI 10.21957/d7xy-nh24
Experiment ID h4qi
Experiment class ECMWF Research Department
Examples

Forecast fields for u-wind @250 hPa, step gives forecast range in hours

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer

server = ECMWFDataServer()

server.retrieve({
    "anoffset": "9",
    "class": "rd",
    "dataset": "research",
    "date": "2019-01-30",
    "expver": "h4qi",
    "levelist": "250",
    "levtype": "pl",
    "param": "131",
    "step": "0/12/24/48",
    "stream": "lwda",
    "target": "output.grib",
    "time": "00:00:00",
    "type": "fc"
})

Analysis fields for u-wind and v-wind @250 hPa

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer

server = ECMWFDataServer()

server.retrieve({
    "anoffset": "9",
    "class": "rd",
    "dataset": "research",
    "date": "2019-01-28",
    "expver": "h4qi",
    "levelist": "250",
    "levtype": "pl",
    "param": "131/132",
    "stream": "lwda",
    "target": "analysis.bufr",
    "time": "00:00:00",
    "type": "an"
})