GSIbec: Extracts the background error covariance (BEC) model capabilities from the Gridpoint Statistical Interpolation (GSI) atmospheric analysis system into a library of its own.
The main objective of this library is to aid JEDI and make the GSI BEC available for applications of interest in that context.
Strong dependencies: MPI Weak dependecies: SP (spectral lib from NCEP)
This package should be renamed lower-case gsibec after cloning.
At this stage, two c-tests serve as demo for the use of the code. These can be executed from the build/gsibec/test as follows:
ctest -V -R gsibec_test_tier1_geos
ctest -V -R gsibec_test_tier1_gfs
as the names indicate they tests provide examples on use of B in the grid of GEOS (lat-lon) or GFS (Gaussian). The namelists driving both tests are found in the testinput directory of gsibec/test. Familiarity with GSI tells that the driving namelist is much similar to some of the nameslists in GSI, as well as the so-called anavinfo file. However, let the user not be fooled, not all variables from GSI are meanningful in the context of GSIbec, and to a large extent are not available here.
The c-tests above are not quite the typical JEDI c-test. Instead of comparing numbers and text files, the tests produce grads files (and corresponding control tables) with the result of the test. The test is set to apply B to a vector field set as multiple Dirac-like functions placed randomly on the globe. The default c-test uses on 6 processors to run; the user can re-run the examples by hand with other choices of number of processors. Notice that by construction, and for simplicity, a changes in the number of PEs changes the number of Dirac-functions placed on the globe.