@Article{WuZoAlMaSaMa:2020:UnEpIn,
author = "Wu, Huanyu and Zou, Yong and Alves, Lincoln Muniz and Macau,
Elbert Einstein Nehrer and Sampaio, Gilvan and Marengo, Jos{\'e}
A.",
affiliation = "{East China Normal University} and {East China Normal University}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Centro Nacional de
Monitoramento e Alertas de Desastres Naturais (CEMADEN)}",
title = "Uncovering episodic influence of oceans on extreme drought events
in Northeast Brazil by ordinal partition network approaches",
journal = "Chaos",
year = "2020",
volume = "30",
number = "5",
month = "May",
abstract = "Since 2012, the semiarid region of Northeast Brazil (NEB) has been
experiencing a continuous dry condition imposing significant
social impacts and economic losses. Characterizing the recent
extreme drought events and uncovering the influence from the
surrounding oceans remain to be big challenges. The physical
mechanisms of extreme drought events in the NEB are due to varying
interacting time scales from the surrounding tropical oceans
(Pacific and Atlantic). From time series observations, we propose
a three-step strategy to establish the episodic coupling
directions on intraseasonal time scales from the ocean to the
precipitation patterns in the NEB, focusing on the distinctive
roles of the oceans during the recent extreme drought events of
2012-2013 and 2015-2016. Our algorithm involves the following: (i)
computing drought period length from daily precipitation anomalies
to capture extreme drought events; (ii) characterizing the
episodic coupling delays from the surrounding oceans to the
precipitation by applying the Kullback-Leibler divergence (KLD) of
complexity measure, which is based on ordinal partition transition
network representation of time series; and (iii) calculating the
ratio of high temperature in the ocean during the extreme drought
events with proper time lags that are identified by KLD measures.
From the viewpoint of climatology, our analysis provides
data-based evidence of showing significant influence from the
North Atlantic in 2012-2013 to the NEB, but in 2015-2016, the
Pacific played a dominant role than that of the Atlantic. The
episodic intraseasonal time scale properties are potential for
monitoring and forecasting droughts in the NEB in order to propose
strategies for drought impacts reduction.",
doi = "10.1063/5.0004348",
url = "http://dx.doi.org/10.1063/5.0004348",
issn = "1054-1500",
language = "en",
targetfile = "wu_uncovering.pdf",
urlaccessdate = "28 abr. 2024"
}