Some considerations on onset dates of the rainy season in Western‐Central Brazil with antisymmetric outgoing longwave radiation relative to the equator

Garcia, Sâmia Regina; Kayano, Mary Toshie

doi:10.1002/joc.3417

Cited by 18 publications

(29 citation statements)

References 20 publications

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“…In this analysis, we used the daily precipitation from the Climate Hazards Group InfraRed Precipitation with Station data (CHIRPS) [80], which has the advantage of incorporating 0.05 • resolution satellite imagery with in situ station data. The determination of the onset/demise dates and the length of the rainy season in the Amazon region and South America have already been investigated by different methods [7,77,78,[81][82][83][84][85]. However, the method used in our study was sufficient for our purpose.…”

Section: Identification Of the Onset And Demise Of The Rainy Seasonmentioning

confidence: 99%

The Atmospheric Branch of the Hydrological Cycle over the Negro and Madeira River Basins in the Amazon Region

Sorí

Marengo

Nieto

et al. 2018

Water

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Section: Identification Of the Onset And Demise Of The Rainy Seasonmentioning

confidence: 99%

The Atmospheric Branch of the Hydrological Cycle over the Negro and Madeira River Basins in the Amazon Region

Sorí

Marengo

Nieto

et al. 2018

Water

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“…Over South America, Garcia and Kayano () and Garcia and Kayano () used area averages of OLR anomalies as an index of the rainy season over the central Amazon and central Brazil regions. Changes in the signs of spatially averaged OLR anomalies indicate onset and demise of the rainy season.…”

Section: Defining Onset and End Datesmentioning

confidence: 99%

Detection, variability, and predictability of monsoon onset and withdrawal dates: A review

Bombardi

Moron

Goodnight

2019

Intl Journal of Climatology

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This article presents a review of the scientific literature on detection, sources of variability, and predictability of the timing of monsoons. The timing of monsoons is characterized by the beginning (commonly referred to as onset) and end (commonly referred to as demise, cessation, retreat, or withdrawal) dates of the summer monsoons. The main methods used to detect the timing of monsoons are divided into two categories: local‐scale methods and regional to large‐scale methods. The sources of variability of the timing of monsoons are also separated into two categories: local‐scale and large‐scale sources. Finally, the article presents a summary of the literature on the predictability of the timing of monsoons using both dynamical and statistical approaches. We show that all methods are parameterized in some way. A comparison between two different methods shows that while there might be large differences in the definition of onset and demise dates at the local level, spatial aggregation usually reduces the noise and enhances the regional monsoonal signal, which may be predictable.

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“…Bombardi et al (2020) provides a recent review of methods for objectively defining monsoon onset and retreat dates and highlighted the technical differences and purposes of each. Methods can be divided into those that aim to evaluate monsoon onset and retreat on a regional scale (e.g., Webster and Yang, 1992;Fasullo and Webster, 2003;Garcia and Kayano, 2013) or at a local or grid-box scale (e.g., Liebmann and Marengo, 2001;Cook and Buckley, 2009). Threshold methods are the most commonly used local-scale methods that typically diagnose onset and retreat from a precipitation time-series (Bombardi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the North American Monsoon occurs over a much shorter time than the South American Monsoon and is smaller geographically (Vera et al ., 2006). Within a given monsoon region, for example, in the South American Monsoon, several methods are used for different purposes depending on the temporal and spatial scales of interest (see, for example, Liebmann and Marengo, 2001; Marengo et al ., 2001; Nieto‐Ferreira and Rickenbach, 2011; Carvalho et al ., 2011; Garcia and Kayano, 2013). The differences between the characteristics of the datasets, for example, in horizontal resolution, relate to differences in the seasonal cycle of rainfall which means that the implementation of threshold methods in different datasets also requires normalization or statistical treatment of the threshold and persistence parameters.…”

Section: Introductionmentioning

confidence: 99%

A wavelet transform method to determine monsoon onset and retreat from precipitation time‐series

García‐Franco

Osprey

Gray

2021

Intl Journal of Climatology

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A new method to determine monsoon onset and retreat timings using wavelet transform methodology applied to precipitation time-series at the pentad scale is described. The principal advantage of this method is its portability, since it can be easily adapted for any region and dataset. The application of the method is illustrated for the North American Monsoon and the Indian Monsoon using four different precipitation datasets and climate model output. The method is shown to be robust across all the datasets and both monsoon regions. The mean onset and retreat dates agree well with previous methods. Spatial distributions of the precipitation and circulation anomalies identified around the onset and retreat dates are also consistent with previous work and illustrate that this method may be used at the grid-box scale, not just over large area-averaged regions. The method is also used to characterize the strength and timing of the Midsummer drought (MSD) in southern Mexico and Central America. A two peak structure is found to be a robust structure in only in 33% of the years, with other years showing only one peak or no signs of a bimodal distribution. The two-peak structure analysed at the grid-box scale is shown to be a significant signal in several regions of Central America and southern Mexico. The methodology is also applied to climate model output from the Met Office Hadley Centre UKESM1 and HadGEM3 CMIP6 experiments. The modelled onset and retreat dates agree well with observations in the North American Monsoon but not in the Indian Monsoon. The start and end of the modelled MSD in southern Mexico and Central America is delayed by one pentad and has a stronger bimodal signal than observed.

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Some considerations on onset dates of the rainy season in Western‐Central Brazil with antisymmetric outgoing longwave radiation relative to the equator

Cited by 18 publications

References 20 publications

The Atmospheric Branch of the Hydrological Cycle over the Negro and Madeira River Basins in the Amazon Region

The Atmospheric Branch of the Hydrological Cycle over the Negro and Madeira River Basins in the Amazon Region

Detection, variability, and predictability of monsoon onset and withdrawal dates: A review

A wavelet transform method to determine monsoon onset and retreat from precipitation time‐series

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