ECMWF plans to start assimilating GPS radio occultation measurements with a two dimensional (2D) bending angle operator in 2014. We will describe the new operator, and explain how it has been implemented on the parallel computing system. Issues relating to the computational cost of the operator will be discussed, and a new hybrid approach using a 2D operator in the 4D-Var outer-loop and a 1D op...

Comparison of GOME tropospheric NO2 columns with NO2 profiles deduced from ground-based in situ measurements D. Schaub, K. F. Boersma, J. W. Kaiser, A. K. Weiss, D. Folini, H. J. Eskes, and B. Buchmann Swiss Federal Institute for Materials Science and Technology (Empa), Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE...

Abstract Correcting the forecast bias of numerical weather prediction models is important for severe warnings. The refined grid requires direct correction on gridded products, as opposed to correcting data only at individual stations. In this study, a deep learning method called CU-net proposed correct forecasts four variables from European Centre Medium-Range Weather Forecast Integrated Foreca...

The first Chinese operational Ku-band scatterometer on board Haiyang-2A (HY-2A), launched in August 2011, is designed for monitoring the global ocean surface wind. This study estimates the quality of the near-real-time (NRT) retrieval wind speed and wind direction from the HY-2A scatterometer for 36 months from 2012 to 2014. We employed three types of sea-surface wind data from oceanic moored b...

The radiative transfer models developed at AER are being used extensively for a wide range of applications in the atmospheric sciences. This communication is intended to provide a coherent summary of the various radiative transfer models and associated databases publicly available from AER (http:// www.rtweb.aer.com). Among the communities using the models are the remote sensing community (e.g....

Aircraft observations of wind and temperature are very important for upper air meteorology. In this article, the quality of the meteorological information of an Automatic Dependent Surveillance-Contract (ADS-C) message is assessed. The ADS-C messages broadcast by the aircraft are received at air traffic control centres for surveillance and airline control centres for general aircraft and dispat...