Stories

All OSI SAF Stories from the most recent to the oldest

  • In the context of the OSI SAF Visiting Scientist Program, Feixiong Huang from the Purdue University, West Lafayette, USA, worked on the assimilation of GNSS-R measurements into numerical weather prediction (NWP) models. This work took place in May 2019 to August 2019 and was supervised by Ad Stoffelen (KNMI) and James Garrison (Purdue).

    Introduction

  • CFOSAT-Windrad-simulation_OSISAF

    In the frame of the NWP SAF and of the OSI SAF, the scatterometer team at KNMI assessed the performance of CFOSAT and WindRad Rotating Fan-beam Scatterometer Simulation and Wind Retrieval.

    Here below, Zhen Li explains briefly what was done and what was found during this study.

    What did we do?

    • Built a simulation framework for all existing rotating-beam scatterometer types (rotating fan-beam and rotating pencil-beam).

  • Distribution of OE SST minus buoy SST differences against latitude for untuned and tuned OE

    In the context of the OSI SAF Visiting Scientist Program, Christopher Merchant from Univeristy of Reading worked at Météo-France in February 2019 on determining bias correction and covariance carameters for Optimal Estimation of Sea Surface Temperature.

  • Following the availability of the continuous and consistent extension of the latest OSI SAF sea ice concentration (SIC) climate data record (CDR), the plots on sea ice extent have been updated. They are now based on the second release of the CDR (OSI-450) and its ICDR (OSI-430-b). ICDR means Interim Climate Data Record.

  • In the context of the OSI SAF Visiting Scientist Program, Wenming Lin from the Institut de Ciències del Mar (ICM - CSIC) in Barcelona, Spain (now with the Nanjing University of Information, Science, and Technology, China), worked on the validation of the new Geophysical Model Function and on the improvement of the quality control for Ku-band rotating pencil-beam scatterometers. This work took place in 2017 - 2019 and was supervised by Marcos Portabella (ICM) and Ad Stoffelen (KNMI).

    Objectives and framework of the study:

  • In the context of the OSI SAF Visiting Scientist Program, Carolina Gabarro from the BEC/ Institut de Ciències del Mar (ICM - CSIC) in Barcelona, worked on the inter-comparison of high and low microwave frequency sea ice concentration algorithms during winter and autumn. This work took place in from November 2017 to October 2018 and was supervised by Rasmus T. Tonboe (DMI) and Thomas Lavergne (MetNO).

    Objectives and framework of the study:

  • Locations of the matches
    From end of 2014 to end of 2017, the OSI SAF teams participated to Sentinel-3 SST Cal/Val.
    This activity with EUMETSAT Secretariat included the following activities :
    • the building and delivery by Ifremer of a dedicated S3A/SLSTR Match-up database (MDB)
    • the provision by DMI of collocated ISAR and S3A/SLSTR skin SST measurements during the S3A/SLSTR cal/val phase, from DMI’s ISAR radiometer operated on a Royal Arctic Lines (RAL) ship, cruising regularly between Denmark and Greenland.
  • June 2010: on the left, nightime monthly mean SST from the MSG reprocessed data; on the right, monthly mean difference to a climatology of the OSTIA reanalysis from 1985 to 2007.

    A few months ago, the OSI SAF released a data record of Sea Surface Temperature (SST) on the full Earth disc seen by Meteosat in 0°.

    The data record covers eight years of data, from 2004 to 2012 and is derived from the SEVIRI imager on Meteosat Second Generation (MSG) satellites (Meteosat-8 and Meteosat-9).

  • In the context of the OSI SAF Visiting Scientist Program, Gregory King worked from the Institut de Ciències del Mar (ICM - CSIC) in Barcelona, Spain on Correlating extremes in wind and stress divergence with extremes in rain over the Tropical Atlantic. This work took place in 2016 - 2017 and was supervised by Marcos Portabella (ICM) and Ad Stoffelen (KNMI).
     
    Objectives and framework of the study :
  • In the frame of the OSI SAF Visiting Scientist Program, Lise Kilic from the "Observatoire de Paris" (LERMA) has worked at the Danish Meteorological Institute (DMI) on Improving the effective temperature estimation over sea ice using low frequency microwave radiometer data and Arctic buoys.
    This work took place in 2017 and was supervised by Rasmus Tonboe (DMI).
     
  • SST/DLI/SSI with Meteosat-8
    Sea Surface Temperature (SST) and radiative fluxes (Downward Long wave Irradiance DLI and Solar Surface Irradiance SSI) are processed over Indian Ocean using Meteosat-8 data as input data.
  • Click here to look at quicklooks : http://osisaf.met.no/p/ice_reproc_daily_twoimg.php

  • To answer to the climate community, OSI SAF re-process winds products to generate Thematic Climate Data Records.

    Continuous scatterometer data series exist since 1991 and are processed into climate data records, providing links to the ESA CCI or ERA-CLIM.

    The characteristics and data formats of the products are the same as their near-real time equivalent but the data records are processed with newest algorithms and with fully calibrated input data.

    Here are the first releases of the OSI SAF wind data records :

  • Forecasters and other users are usually interested in the winds near a storm, location or facility, but are faced with collecting information through many “clicks”. Recently, however, the OSI SAF winds team at KNMI has developed a new visualization tool which gives easy access to near-real time OSI SAF winds from all available instruments on one web page in a known meteorological context. Our goal was to create a fast, location-based access, rather than access based on instrument or product.

  • We are pleased to announce that the High Latitude Level 3 Global AMSR Sea Ice concentration product is operational since March 16th 2017.