Arctic Summer Cloud-Ocean Study
Meteorological model data
ERA-Interim is the to date latest reanalysis effort from the ECMWF (European Centre for Medium-Range Weather Forecasts) with an improved atmospheric model and assimilation system, replacing those used in ERA-40. Through systematic increases of computing power, 4-dimensional variational assimilation (4D-Var) became feasible and part of ECMWF operations since 1997, paving the way to ERA-Interim, rather than using the older 3D-Var concept. The resolution was also increased to T255 (nominally 0.703125 degrees) using the atmospheric model (IFS Cy31r1/2) taking advantage of improved model physics. ERA-interim retains the same 60 model levels used for ERA-40 with the highest level being 0.1 hPa. In addition, ERA-Interim also benefits from improved quality control using variational bias correction of satellite radiance data, and more extensive use of radiances with an improved fast radiative transfer model. The data stored here is a subset of data downloaded from the Research Data Archive (RDA) which is maintained by the Computational and Information Systems Laboratory (CISL) at the National Center for Atmospheric Research (NCAR); the original data are available from the RDA in dataset number ds627.0 (NCAR is sponsored by the National Science Foundation, NSF). There are two files included: ascos_ERAInt.nc are the ERA-Interim pressure level and surface analysis files interpolated to the Oden’s position. Ascos_ERAInt_other.nc are the ERA-Interim model forecast files interpolated to the Oden’s position. All interpolations are linear. Please note that several of the variables within the forecast files are not instantaneous values, but rather are accumulated over the simulation period.
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