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Ticket | Owner | Reporter | Resolution | Summary |
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#816 | Done | VERY IMPORTANT: Reconciling GIT and SVN repositories | ||
Description |
The GIT repository was modified to include the correct information about SVN properties (URL, revision, and modification date) along with with the GIT properties for URL and commit hash. Both the SVN and GIT trunks are identical except for the makefile and ROMS/Version which have a couple of extra commands. For example, the ROMS standard output will include repository and revision information: GIT Root URL : https://www.myroms.org/git/src GIT Revision : 2f07d7f23c47cb2a2364ff8b653addd1ebd0c699 SVN Root URL : https://www.myroms.org/svn/src/trunk SVN Revision : 967 And the output NetCDF files global attributes will include: :git_url = "https://www.myroms.org/git/src" ; :git_rev = "2f07d7f23c47cb2a2364ff8b653addd1ebd0c699" ; :svn_url = "https://www.myroms.org/svn/src/trunk" ; :svn_rev = "967" ; Warning:
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#817 | Done | Analysis-Forecast Observation Impacts driver | ||
Description |
Added a new driver obs_sen_w4dpsas_forecast.h for computing observation impacts for the analysis-forecast cycle. It is activated with C-preprocessing option W4DPSAS_FCT_SENSITIVITY. It basically computes the impacts of each observation on the forecast error. Added the tangent linear (tl_rpcg_lanczos.F) and adjoint (ad_rpcg_lanczos.F) versions of the Restricted B-preconditioned Conjugate Gradient Lanczos algorithm (known as RBLanczos or RPCG) used the 4D-Var dual formulation. The following diagram is used to explain the forecast cycle observations impacts: For more information, check the following WikiROMS page. The red and blue curves show the typical configuration for the algorithm computing the analysis-forecast cycle observation impacts. The observation impacts can be forced at the model grid points, defining the desired metrics or at the observation locations when OBS_SPACE is activated additionally. WARNINGS: Both the roms.in and s4dvar.in scripts were modified to add new parameters needed in them analysis-forecast cycle observation impacts configuration:
References: Errico, R.M., 2007: Interpretations of an adjoint-derived observational impact measure, Tellus, 59A, 273-276. Gelaro, R., Y. Zhu, R.M. Errico, 2007: Examination of various-order adjoint-based approximations of observation impact, Meteorologische Zeitschrift, 16, 685-692. Langland, R.H. and N.Baker, 2004: Estimation of observation impact using the NRL atmospheric variational data assimilation adjoint system, Tellus, 56, 189-201. Many thanks to Andy Moore for his help coding and testing this complex algorithm. There are involved technical description that will be published in the near feature with realistic applications. |
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#818 | Fixed | Important: Corrected typo in prsgrd42.h and prsgrd44.h | ||
Description |
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