57 research outputs found
Precision predictions for supersymmetric dark matter
The dark matter relic density has been measured by Planck and its
predecessors with an accuracy of about 2%. We present theoretical calculations
with the numerical program DM@NLO in next-to-leading order SUSY QCD and beyond,
which allow to reach this precision for gaugino and squark (co-)annihilations,
and use them to scan the phenomenological MSSM for viable regions, applying
also low-energy, electroweak and hadron collider constraints.Comment: 6 pages, 1 table, 8 figures, proceedings of ICHEP 201
Variational analysis of drifter positions and model outputs for the reconstruction of surface currents in the central Adriatic during fall 2002
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 113 (2008): C04004, doi:10.1029/2007JC004148.In this paper we present an application of a variational method for the reconstruction of the velocity field in a coastal flow in the central Adriatic Sea, using in situ data from surface drifters and outputs from the ROMS circulation model. The variational approach, previously developed and tested for mesoscale open ocean flows, has been improved and adapted to account for inhomogeneities on boundary current dynamics over complex bathymetry and coastline and for weak Lagrangian persistence in coastal flows. The velocity reconstruction is performed using nine drifter trajectories over 45 d, and a hierarchy of indirect tests is introduced to evaluate the results as the real ocean state is not known. For internal consistency and impact of the analysis, three diagnostics characterizing the particle prediction and transport, in terms of residence times in various zones and export rates from the boundary current toward the interior, show that the reconstruction is quite effective. A qualitative comparison with sea color data from the MODIS satellite images shows that the reconstruction significantly improves the description of the boundary current with respect to the ROMS model first guess, capturing its main features and its exchanges with the interior when sampled by the drifters.Four of the authors are supported by the
Office of Naval Research, V.T. and A.G. under grants N00014-05-1-0094
and N00014-05-1-0095, P.M.P. under grant N00014-03-1-0291, and S.C.
under grant N00014-05-1-0730. CNR-ISMAR
activity was partially supported by P.O.R. ââCAINOââ (Regione Puglia),
VECTOR (Italian MIUR) project, and ECOOP (EU project)
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A comparison of two identification and tracking methods for polar lows
In this study, we compare two different cyclone-tracking algorithms to detect North Atlantic polar lows, which
are very intense mesoscale cyclones. Both approaches include spatial filtering, detection, tracking and
constraints specific to polar lows. The first method uses digital bandpass-filtered mean sea level pressure
(MSLP) fieldsin the spatial range of 200ïżœ600 km and is especially designed for polar lows. The second method
also uses a bandpass filter but is based on the discrete cosine transforms (DCT) and can be applied to MSLP
and vorticity fields. The latter was originally designed for cyclones in general and has been adapted to polar
lows for this study. Both algorithms are applied to the same regional climate model output fields from October
1993 to September 1995 produced from dynamical downscaling of the NCEP/NCAR reanalysis data.
Comparisons between these two methods show that different filters lead to different numbers and locations of
tracks. The DCT is more precise in scale separation than the digital filter and the results of this study suggest
that it is more suited for the bandpass filtering of MSLP fields. The detection and tracking parts also influence
the numbers of tracks although less critically. After a selection process that applies criteria to identify tracks of
potential polar lows, differences between both methods are still visible though the major systems are identified
in both
Impact of soil moistureâatmosphere coupling on European climate extremes and trends in a regional climate model
An inter-comparison of regional climate models for Europe: model performance in present-day climate
How well can a convection-permitting climate model reproduce decadal statistics of precipitation, temperature and cloud characteristics?
A simple model of the mutual interaction of parallel flow and cellular motion in a shear layer applied to the finite amplitude instability of plane Couette flow
HLI, A Direct Method Suitable for Partial and Fully Implicit Time Integration of Primitive Equation Meteorological Models
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