@Article{GarciaKaya:2015:MuVaMo,
author = "Garcia, S{\^a}mia R. and Kayano, Mary Toshie",
affiliation = "{Universidade Federal de Itajub{\'a} (UNIFEI)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Multidecadal variability of moisture and heat budgets of the South
American monsoon system",
journal = "Theoretical and Applied Climatology",
year = "2015",
volume = "121",
number = "3/4",
pages = "557--570",
month = "Aug.",
abstract = "The variability of sources or sinks of moisture and heat for the
South American monsoon system (SAMS) region is investigated for
the 19581995 period. So, moisture and heat budget equations are
applied to data from the National Centers for Environmental
Prediction (NCEP) reanalysis project. Sources or sinks of moisture
and heat are the equation residues and are referred to as residue
and diabatic terms, respectively. Using empirical orthogonal
function (EOF) analysis, the dominant variability modes of these
terms are obtained for the study period, with the monthly
anomalies of the residue and diabatic terms employed. For residue
EOF01, negative (positive) principal component (PC01) values
correspond to positive (negative) residue anomalies over tropical
South America (TSAM), which indicate a moisture source (sink)
before (after) 1976, cold (warm) phase of the Pacific Decadal
Oscillation (PDO). For the EOF01 of the diabatic term, negative
(positive) PC01 values correspond to negative (positive) diabatic
anomalies over TSAM, indicating a heat sink (source) before
(after) 1976. Thus, a moisture source (sink) and a heat sink
(source) occur over TSAM before (after) 1976. These findings are
corroborated by composite analysis of the anomalies of
precipitable water, 850 hPa air temperature, 500 hPa vertical
pressure velocity, vertically integrated moisture flux (VIMF),
VIMF divergence, and precipitation. In terms of system
thermodynamics, these composites are indicative of SAMS weakening
(strengthening) before (after) 1976, cold (warm) PDO phase.",
doi = "10.1007/s00704-014-1265-1",
url = "http://dx.doi.org/10.1007/s00704-014-1265-1",
issn = "0177-798X",
label = "self-archiving-INPE-MCTI-GOV-BR",
language = "en",
targetfile = "garcia_multidecadal.pdf",
urlaccessdate = "27 abr. 2024"
}