The Impact of Dropsonde and Extra Radiosonde Observations during NAWDEX in Autumn 2016

Autor(en)
Matthias Schindler, Martin Weissmann, Andreas Schäfler, Gabor Radnoti
Abstrakt

Dropsonde observations from three research aircraft in the North Atlantic region, as well as several hundred additionally launched radiosondes over Canada and Europe, were collected during the international North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) in autumn 2016. In addition, over 1000 dropsondes were deployed during NOAA’s Sensing Hazards with Operational Unmanned Technology (SHOUT) and Reconnaissance missions in the west Atlantic basin, supplementing the conventional observing network for several intensive observation periods. This unique dataset was assimilated within the framework of cycled data denial experiments for a 1-month period performed with the global model of the ECMWF. Results show a slightly reduced mean forecast error (1%–3%) over the northern Atlantic and Europe by assimilating these additional observations, with the most prominent error reductions being linked to Tropical Storm Karl, Cyclones Matthew and Nicole, and their subsequent interaction with the midlatitude waveguide. The evaluation of Forecast Sensitivity to Observation Impact (FSOI) indicates that the largest impact is due to dropsondes near tropical storms and cyclones, followed by dropsondes over the northern Atlantic and additional Canadian radiosondes. Additional radiosondes over Europe showed a comparatively small beneficial impact.

Organisation(en)
Institut für Meteorologie und Geophysik
Externe Organisation(en)
Ludwig-Maximilians-Universität München, Hans Ertel Centre for Weather Research,, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), European Centre for Medium-Range Weather Forecasts (ECMWF)
Journal
Monthly Weather Review
Seiten
809-824
ISSN
0027-0644
DOI
https://doi.org/10.1175/MWR-D-19-0126.1
Publikationsdatum
02-2020
Peer-reviewed
Ja
ÖFOS 2012
Meteorologie
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/the-impact-of-dropsonde-and-extra-radiosonde-observations-during-nawdex-in-autumn-2016(6f5d8cac-fad4-4ba1-bdab-c7e50880d4d8).html