Impact of land-surface processes on tropical climate
variability - WP1300
Partners involved: CNRM
(lead contractor), ICTP, MPI,
UB
PROMISE aims to
investigate the role of land surface processes and of anomalies in land
surface conditions in determining the predictability and variability of
monsoon climates.
Key achievements
so far:
-
sensitivity experiments have demonstrated the importance of land-surface
processes in influencing monsoon variability on daily to interannual
timecales. Global AGCM experiments confirm that realistic oil moisture
boundary conditions are necessary for simulating the mid-latitude
stationary waves with a significant impact on both extratropical and
tropical precipitation
-
an analysis of the relationship between Eurasian snow-depth anomalies
and indices of the Asian monsoon circulation has been carried out
using data from numerical simulations performed in the context ofthe
PRISM project
-
a selection of multi-linear regressors have been studied to demonstrate
their effectiveness in predicting Sahelian June-September rainfall.
It was found that April to June meridonal patterns of near surface
MSE content control the amplitude and the timing of the Sahelian July-to-September
rainy season. Wet Sahelian seasons are usually preceded by stronger
than normal MSE gradients during Boreal spring.
-
the necessity of modelling the dynamic vegetation processes for accurate
simulation of interdecadal changes in Sahelian rainfall has been demonstrated
using atmospheric GCMs coupled to a simple dynamic vegetation model
Publications related to this topic by PROMISE partners
Douville H. and J-F. Royer
(1996): Sensitivity of the Asian summer monsoon to an anomalous Eurasian
snow cover within the METEO-FRANCE GCM, Climate Dynamics, 12,
441-448
Douville H, Chauvin F (2000):
Relevance of soil moisture for seasonal climate predictions: a preliminary
study. Climate Dynamics 16, 719-736
Douville H, Chauvin F, Broqua
H (2001): Influence of soil moisture on the Asian and African monsoons.
Part I: Mean monsoon and daily precipitation. J Climate (in press)
Douville H (2001): Influence
of soil moisture on the Asian and African monsoons. Part II: interannual
variability. J Climate (submitted)
Ferranti, L. and F. Molteni,
1999: Ensemble simulations of Eurasian snow-depth anomalies and their
influence on the summer Asian monsoon. Quaterly Journal of the Meteorological
Society, 125, 2597-2610
Corti, S., F. Molteni and C. Brankovic, 2000: Predictability of snow-depth
anomalies over Eurasia and associated circulation patterns. Quaterly
Journal of the Meteorological Society, 126, 241-262
Further information
see:
Work package description in the proposal
Detailed
annual report (available to PROMISE partners or with the permission
of the lead contractor)
18 month progress reports submitted by the partners for this work package
or:
contact Emily Black (emily@met.reading.ac.uk)
|