Backtrajectories from BCO for EUREC4A 20200116_00 to 20200220_21
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- calculated with LAGRANTO (Wernli and Davies, 1997, Sprenger and Wernli, 2015) 
- from the BCO (59.42875 deg W, 13.1626388 deg N)
- with 100 starting points between 1000 hPa and 200 hPa (i.e. 1 starting point every 8 hPa)
- 3D wind fields from the IFS analysis and 4Dvar outputs (3 hourly data)
- ECMWF IFS data on a horizontal grid of 0.2x0.2 deg
- to minimise data file size only 82 vertical levels out of 137 (from surface up to 80 hPa, cut out stratosphere) and a limited domain over the North Atlantic was downloaded (120 deg W to 20 deg E and 20 deg S to 70 deg N) -> fast trajectories might stagnate at the domain edges


Variables on files:
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lat in deg N
lon in deg E
p in hPa
BASEDATE at which the trajectory was started

We can interpolate many other available model variables along the trajectories, if interested, please contact us.

Contacts for questions:
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Franziska Aemisegger: franziska.aemisegger@env.ethz.ch
Leonie Villiger: leonie.villiger@env.ethz.ch

References:
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Wernli, H. and Davies, H. C.: A Lagrangian-based analysis of ex- tratropical cyclones. I: The method and some applications, Q. J. Roy. Meteor. Soc., 123, 467-489, 1997.

Sprenger, M. and Wernli, H.: The LAGRANTO Lagrangian analysis tool - version 2.0, Geosci. Model Dev., 8, 2569-2586, https://doi.org/10.5194/gmd-8-2569-2015, 2015.