lmd_Grandpeix2006.bib
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@article{2006ClDy...27..787H,
author = {{Hourdin}, F. and {Musat}, I. and {Bony}, S. and {Braconnot}, P. and
{Codron}, F. and {Dufresne}, J.-L. and {Fairhead}, L. and {Filiberti}, M.-A. and
{Friedlingstein}, P. and {Grandpeix}, J.-Y. and {Krinner}, G. and
{Levan}, P. and {Li}, Z.-X. and {Lott}, F.},
title = {{The LMDZ4 general circulation model: climate performance and sensitivity to parametrized physics with emphasis on tropical convection}},
journal = {Climate Dynamics},
year = 2006,
month = dec,
volume = 27,
pages = {787-813},
abstract = {{The LMDZ4 general circulation model is the atmospheric component of the
IPSL CM4 coupled model which has been used to perform climate change
simulations for the 4th IPCC assessment report. The main aspects of the
model climatology (forced by observed sea surface temperature) are
documented here, as well as the major improvements with respect to the
previous versions, which mainly come form the parametrization of
tropical convection. A methodology is proposed to help analyse the
sensitivity of the tropical Hadley Walker circulation to the
parametrization of cumulus convection and clouds. The tropical
circulation is characterized using scalar potentials associated with the
horizontal wind and horizontal transport of geopotential (the Laplacian
of which is proportional to the total vertical momentum in the
atmospheric column). The effect of parametrized physics is analysed in a
regime sorted framework using the vertical velocity at 500 hPa as a
proxy for large scale vertical motion. Compared to Tiedtke{\rsquo}s
convection scheme, used in previous versions, the Emanuel{\rsquo}s scheme
improves the representation of the Hadley Walker circulation, with a
relatively stronger and deeper large scale vertical ascent over tropical
continents, and suppresses the marked patterns of concentrated rainfall
over oceans. Thanks to the regime sorted analyses, these differences are
attributed to intrinsic differences in the vertical distribution of
convective heating, and to the lack of self-inhibition by precipitating
downdraughts in Tiedtke{\rsquo}s parametrization. Both the convection and
cloud schemes are shown to control the relative importance of large
scale convection over land and ocean, an important point for the
behaviour of the coupled model.
}},
doi = {10.1007/s00382-006-0158-0},
adsurl = {http://adsabs.harvard.edu/abs/2006ClDy...27..787H},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@article{2006MAP....94..145D,
author = {{Deb}, S.~K. and {Upadhyaya}, H.~C. and {Grandpeix}, J.~Y. and
{Sharma}, O.~P.},
title = {{On convective entrainment in a mass flux cumulus parameterization}},
journal = {Meteorology and Atmospheric Physics},
year = 2006,
month = nov,
volume = 94,
pages = {145-152},
abstract = {{A new entrainment/detrainment formulation in the Tiedtke{\rsquo}s mass
flux cumulus parameterization is discussed here. Apart from validating
it with observations both in one and three dimensional cases, it is also
evaluated in the light of the results from the original Tiedtke scheme
and another mass flux scheme due to Emanuel. The proposed analytical
profiles of entrainment and detrainment, easier to implement in any mass
flux scheme, give reasonable results in GCM experiments.
}},
doi = {10.1007/s00703-005-0175-2},
adsurl = {http://adsabs.harvard.edu/abs/2006MAP....94..145D},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@article{2006JAtS...63.1878H,
author = {{Hallegatte}, S. and {Lahellec}, A. and {Grandpeix}, J.-Y.},
title = {{An Elicitation of the Dynamic Nature of Water Vapor Feedback in Climate Change Using a 1D Model.}},
journal = {Journal of Atmospheric Sciences},
year = 2006,
month = jul,
volume = 63,
pages = {1878-1894},
abstract = {{The concept of feedback has been used by several authors in the field of
climate science to describe the behavior of models and to assess the
importance of the different mechanisms at stake. Here, a simple 1D model
of climate has been built to analyze the water vapor feedback. Beyond a
static quantification of the water feedback, a more general formal
definition of feedback gain based on the tangent linear system is
introduced. This definition reintroduces the dynamical aspect of the
system response to perturbation from Bode's original concept.In the
model here, it is found that, even though the water vapor static gain
proves consistent with results from GCMs, it turns out to be negative
for time scales below 4 yr and positive only for longer time scales.
These results suggest two conclusions: (i) that the water vapor feedback
may be fully active only in response to long-lived perturbations; and
(ii) that the water vapor feedback could reduce the natural variability
due to tropospheric temperature perturbations over short time scales,
while enhancing it over longer time scales. This second conclusion would
be consistent with studies investigating the influence of air sea
coupling on variability on different time scales.
{\lt}HR
ALIGN=''center'' WIDTH=''30\%''{\gt}
}},
doi = {10.1175/JAS3725.1},
adsurl = {http://adsabs.harvard.edu/abs/2006JAtS...63.1878H},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
