On the Presence of Tropical Vortices over the Southeast Asian Sea–Maritime Continent Region

Nguyen, Dang-Quang; Renwick, James; McGregor, James

doi:10.1175/jcli-d-14-00468.1

Cited by 12 publications

(11 citation statements)

References 25 publications

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“…Intriguingly, this result contradicts the explanation for interannual rainfall variability over the mountains in Java island, which assumes that ENSO‐related positive rainfall anomalies are caused by more frequent diurnal cycle (Moron, Robertson, & Qian, ; Qian, Robertson, & Moron, ). The synoptic‐scale disturbances tend to occur frequently near Borneo, whereas the migrations to the Java sea and other Indonesian islands are less frequent (Dang‐Quang et al ). The impact of the synoptic‐scale disturbances on rainfall anomalies can therefore be presumed to differ among the stations over the MC.…”

Section: Resultsmentioning

confidence: 99%

Interpretation of El Niño–Southern Oscillation‐related precipitation anomalies in north‐western Borneo using isotopic tracers

Kurita

Horikawa

Kanamori

et al. 2018

Hydrological Processes

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Section: Resultsmentioning

confidence: 99%

Interpretation of El Niño–Southern Oscillation‐related precipitation anomalies in north‐western Borneo using isotopic tracers

Kurita

Horikawa

Kanamori

et al. 2018

Hydrological Processes

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“…In order to quantify the degree to which the tier‐2 and flat patterns distinguish synoptic‐scale variability, we study the pattern‐conditioned probability of the occurrence of synoptic weather events known to impact weather in Southeast Asia. We consider cold surges (Chang et al ., 2005; Hattori et al ., 2011), tropical cyclones (Hodges et al ., 2017), the MJO (Wheeler and Hendon, 2004), the Borneo vortex (Chang et al ., 2005), the BSISO (Lee et al ., 2013), vortices in the South China Sea (Dang‐Quang et al ., 2016) and equatorial waves (Yang et al ., 2003), and use objective event definitions from previous studies. The following list describes the event definitions used to calculate the co‐occurrence between synoptic events and the weather patterns.…”

Section: Representation Of Modes Of Tropical Variabilitymentioning

confidence: 99%

Weather patterns in Southeast Asia: Relationship with tropical variability and heavy precipitation

Howard

Thomas

Frame

et al. 2021

Quart J Royal Meteoro Soc

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Two sets of weather patterns describing variability in 850 hPa winds in Southeast Asia are presented and compared. Patterns are calculated using EOF/k-means clustering with and without imposing a separation between planetary-scale and regional-scale circulation features. The former are labelled as tiered patterns while the latter are referred to as flat. The ability of the patterns to distinguish between known modes of tropical circulation variability is examined. This includes climate modes such as the seasonal monsoons, the El Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) as well as sub-seasonal modes including cold surges, phases of the MJO and Boreal summer intraseasonal oscillation (BSISO), tropical cyclones, Borneo vortices and equatorial waves. All these modes are well captured by the weather patterns except for the equatorial waves and the IOD. The tiered patterns are shown to better describe large-scale modes of variability, while the flat patterns better describe the synoptic variability. Both sets of weather patterns are then used to study the likelihood of heavy precipitation depending on synoptic circulation by considering the regime-conditioned probability of high-percentile precipitation using the satellite-derived Global Precipitation Measurement (GPM) dataset. It is shown that the pattern centroids explain up to 10% of the seasonally anomalous precipitation over land, and that a perfect weather pattern forecast would outperform a perfect MJO forecast. These weather patterns show promising potential in extending the useful forecast range for the risk of heavy precipitation, dependent on their forecastability.

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“…Hence, understanding their variability is not just important for disaster mitigation but also for the management of hydrological resources. Nguyen et al (2016) used the term Southeast Asian Sea-Maritime Continent vortices or SMVs to refer to these vortices within the Southeast Asia-Maritime Continent region (SEAMC; 10 S-25 N, 100 -120 E). They also quantified the rainfall induced by these SMVs and separated those induced by TCs and non-TCs over the SEAMC region.…”

Section: Introductionmentioning

confidence: 99%

The contribution of non‐tropical cyclone vortices to the rainfall of the Philippines

Olaguera

Matsumoto

Manalo

2022

Intl Journal of Climatology

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Weaker disturbances than tropical cyclones (TCs) such as tropical depressions and cold surges can significantly induce heavy rainfall and flooding events over the Philippines. However, the analysis of these disturbances including their rainfall contributions are often neglected in previous studies. As the first attempt to address this research gap, this study investigates the rainfall contribution of non‐TC vortices over the Philippines from 1979 to 2020. Only those rainfall‐producing non‐TC vortices that formed and appeared within a 500‐km radius from the Philippine coastline were examined in this study. A total of 7,686 non‐TC vortex days (50% of the total days during the analysis period) were identified. The mean rainfall contribution of these non‐TC vortices was found to be highest over the northeastern Mindanao Island (80–90% of the mean daily rainfall) and lowest over the central and western regions of Luzon Island (50–60%). Seasonal analysis of the occurrence frequency of these vortices shows that they are most frequent during the December–February (DJF) season. In this season, the rainfall contribution may increase to 50–80% of the mean daily rainfall over the whole country, while in the other seasons, the rainfall contribution may only increase to as much as 60%. Higher frequency of extreme rainfall days associated with these non‐TC vortices were also found during the DJF season. The frequency of occurrence and percentage rainfall contribution of these non‐TC vortices in relation to the different phases of the Boreal Summer Intraseasonal Oscillation (BSISO) during boreal summer (June–October) and the Madden–Julian Oscillation (MJO) during boreal winter (December–April) were also examined. Higher frequency and percentage rainfall contribution over the country were found during Phases 4–6 of both the BSISO and MJO, during which their respective active convections transition from the Maritime Continent to the western North Pacific.

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On the Presence of Tropical Vortices over the Southeast Asian Sea–Maritime Continent Region

Cited by 12 publications

References 25 publications

Interpretation of El Niño–Southern Oscillation‐related precipitation anomalies in north‐western Borneo using isotopic tracers

Interpretation of El Niño–Southern Oscillation‐related precipitation anomalies in north‐western Borneo using isotopic tracers

Weather patterns in Southeast Asia: Relationship with tropical variability and heavy precipitation

The contribution of non‐tropical cyclone vortices to the rainfall of the Philippines

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