@Article{PereiraSilMorChiCar:2017:ImPrSi,
author = "Pereira, Gabriel and Silva, Maria Elisa Siqueira and Moraes,
Elisabete Caria and Chiquetto, J{\'u}lio Barboza and Cardozo,
Francielle da Silva",
affiliation = "{Universidade Federal de S{\~a}o Jo{\~a}o Del Rei (UFSJ)} and
{Universidade de S{\~a}o Paulo (USP)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade de S{\~a}o Paulo
(USP)} and {Universidade Federal de S{\~a}o Jo{\~a}o Del Rei
(UFSJ)}",
title = "Improving precipitation simulation from updated surface
characteristics in South America",
journal = "Theoretical and Applied Climatology",
year = "2017",
volume = "129",
number = "1/2",
pages = "521--538",
month = "July",
abstract = "Land use and land cover maps and their physical-chemical and
biological properties are important variables in the numerical
modeling of Earth systems. In this context, the main objective of
this study is to analyze the improvements resulting from the land
use and land cover map update in numerical simulations performed
using the Regional Climate Model system version 4 (RegCM4), as
well as the seasonal variations of physical parameters used by the
Biosphere Atmosphere Transfer Scheme (BATS). In general, the
update of the South America 2007 land use and land cover map, used
by the BATS, improved the simulation of precipitation by 10 %,
increasing the mean temporal correlation coefficient, compared to
observed data, from 0.84 to 0.92 (significant at p < 0.05,
Student's t test). Correspondingly, the simulations performed with
adjustments in maximum fractional vegetation cover, in visible and
shortwave infrared reflectance, and in the leaf area index, showed
a good agreement for maximum and minimum temperature, with values
closer to observed data. The changes in physical parameters and
land use updating in BATS/RegCM4 reduced overestimation of
simulated precipitation from 19 to 7 % (significant at p < 0.05,
Student's t test). Regarding evapotranspiration and precipitation,
the most significant differences due to land use updating were
located (1) in the Amazon deforestation arc; (2) around the
Brazil-Bolivia border (in the Brazilian Pantanal wetlands); (3) in
the Northeast region of Brazil; (4) in northwestern Paraguay; and
(5) in the River Plate Basin, in Argentina. Moreover, the main
precipitation differences between sensitivity and control
experiments occurred during the rainy months in central-north
South America (October to March). These were associated with a
displacement in the South Atlantic convergence zone (SACZ)
positioning, presenting a spatial pattern of alternated areas with
higher and lower precipitation rates. These important differences
occur due to the replacement of tropical rainforest for pasture
and agriculture and the replacement of agricultural areas for
pasture, scrubland, and deciduous forest.",
doi = "10.1007/s00704-016-1800-3",
url = "http://dx.doi.org/10.1007/s00704-016-1800-3",
issn = "0177-798X",
language = "en",
targetfile = "pereira_improving.pdf",
urlaccessdate = "15 jun. 2024"
}