311 research outputs found
A study for systematic errors of the GLA forecast model in tropical regions
From the sensitivity studies performed with the Goddard Laboratory for Atmospheres (GLA) analysis/forecast system, it was revealed that the forecast errors in the tropics affect the ability to forecast midlatitude weather in some cases. Apparently, the forecast errors occurring in the tropics can propagate to midlatitudes. Therefore, the systematic error analysis of the GLA forecast system becomes a necessary step in improving the model's forecast performance. The major effort of this study is to examine the possible impact of the hydrological-cycle forecast error on dynamical fields in the GLA forecast system
Research highlights of the global modeling and simulation branch for 1986-1987
This document provides a summary of the research conducted in the Global Modeling and Simulation Branch and highlights the most significant accomplishments in 1986 to 1987. The Branch has been the focal point for global weather and climate prediction research in the Laboratory for Atmospheres through the retrieval and use of satellite data, the development of global models and data assimilation techniques, the simulation of future observing systems, and the performance of atmospheric diagnostic studies
Documentation of the GLAS fourth order general circulation model. Volume 1: Model documentation
The volume 1, of a 3 volume technical memoranda which contains a documentation of the GLAS Fourth Order General Circulation Model is presented. Volume 1 contains the documentation, description of the stratospheric/tropospheric extension, user's guide, climatological boundary data, and some climate simulation studies
Documentation of the GLAS fourth order general circulation model. Volume 2: Scalar code
Volume 2, of a 3 volume technical memoranda contains a detailed documentation of the GLAS fourth order general circulation model. Volume 2 contains the CYBER 205 scalar and vector codes of the model, list of variables, and cross references. A variable name dictionary for the scalar code, and code listings are outlined
Documentation of the GLAS fourth order general calculation model. Volume 3: Vectorized code for the Cyber 205
Volume 3 of a 3-volume technical memoranda which contains documentation of the GLAS fourth order genera circulation model is presented. The volume contains the CYBER 205 scalar and vector codes of the model, list of variables, and cross references. A dictionary of FORTRAN variables used in the Scalar Version, and listings of the FORTRAN Code compiled with the C-option, are included. Cross reference maps of local variables are included for each subroutine
Folding and insertion thermodynamics of the transmembrane WALP peptide
The anchor of most integral membrane proteins consists of one or several
helices spanning the lipid bilayer. The WALP peptide, GWW(LA)(L)WWA, is a
common model helix to study the fundamentals of protein insertion and folding,
as well as helix-helix association in the membrane. Its structural properties
have been illuminated in a large number of experimental and simulation studies.
In this combined coarse-grained and atomistic simulation study, we probe the
thermodynamics of a single WALP peptide, focusing on both the insertion across
the water-membrane interface, as well as folding in both water and a membrane.
The potential of mean force characterizing the peptide's insertion into the
membrane shows qualitatively similar behavior across peptides and three force
fields. However, the Martini force field exhibits a pronounced secondary
minimum for an adsorbed interfacial state, which may even become the global
minimum---in contrast to both atomistic simulations and the alternative PLUM
force field. Even though the two coarse-grained models reproduce the free
energy of insertion of individual amino acids side chains, they both
underestimate its corresponding value for the full peptide (as compared with
atomistic simulations), hinting at cooperative physics beyond the residue
level. Folding of WALP in the two environments indicates the helix as the most
stable structure, though with different relative stabilities and chain-length
dependence.Comment: 12 pages, 5 figure
Stratospheric Data Analysis System (STRATAN)
A state of the art stratospheric analyses using a coupled stratosphere/troposphere data assimilation system is produced. These analyses can be applied to stratospheric studies of all types. Of importance to this effort is the application of the Stratospheric Data Analysis System (STRATAN) to constituent transport and chemistry problems
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