INVESTIGADORES
RUIZ Juan Jose
congresos y reuniones científicas
Título:
Sensitivity to changes in soil moisture and land use over the Gran Chaco Region
Autor/es:
PATRICIA, BLATTER; JUAN J. RUIZ; MANUEL PULIDO
Lugar:
Denver
Reunión:
Congreso; WCRP Open Science Conference; 2011
Institución organizadora:
World Meteorological Organization
Resumen:
The feedback between soil moisture and regional climate in the Gran
Chaco region (a region that covers the Northeast of Argentina,
East of Bolivia, most of Paraguay and a small part of Brazil)is
examined using the WRF mesoscale model which includes NOAH
module as land model. The initial and boundary conditions are taken
from The National Centers for Environmental Prediction (NCEP) Global Data
Assimilation System (GDAS) analysis. Sensitivity experiments with
different initial soil moisture conditions and land uses were
conducted for several 15-day period during the spring-summer season
of 2009-2010.
Five experiments were performed, a control run, an increasing and
decreasing soil mosture run by 50 % over the studied region, an
evergreen broad leaf run (from the USGS classification) and a
grassland run. All these changes were made in the rectangle
representing the Gran Chaco region.
A strong sensitivity of the precipitation to land use changes and initial
soil moisture conditions is found. The precipitation decreases over
the Gran Chaco Region for the grassland simulation compared to the evergreen broad
leaf simulation . The mean precipitation differences between the
evergreen broad leaf and the grassland case show a dipolar pattern
with a positive response, i. e. an increase of precipitation for the
evergreen broad leaf case, located to the north of the forcing region.
This difference in the precipitation is stronger when the
low level jet is a Chaco Jet event. One explanation for this response
is that the increase of the convection in the forcing region produces
an increase of the subsidence which explains the dipolar pattern in the precipitation
differences.