Climatology of hot events in the western equatorial Pacific

Wirasatriya, Anindya; Kawamura, Hiroshi; Shimada, Tatsuya; Hosoda, Kohtaro

doi:10.1007/s10872-014-0263-3

Cited by 11 publications

(50 citation statements)

References 28 publications

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“…The result of this analysis is then compared to the analysis of the mean state of HE provided in Figure 7 of Wirasatriya et al . [] and used for case study selection. Case study was conducted to obtain the detail of the atmospheric variation during the development and decay stages of HE.…”

Section: Data Set and Methodsmentioning

confidence: 99%

“…Wirasatriya et al . [] elaborated on the climatology of HEs in the western equatorial Pacific using SST data set derived from satellite microwave sensors. Instead of using constant SST threshold of 30°C for HE identification by Qin et al .…”

Section: Introductionmentioning

confidence: 99%

“…[], Wirasatriya et al . [] used the SST threshold changing temporally according to daily mean SST inside the area of 27°C. Throughout 9 years observation (2003–2011), they showed that HEs frequently occur along the northern coast of the New Guinea Island and the Solomon Islands extending eastward up to 160°W (Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…Wirasatriya et al . [] also emphasized that the occurrences of high solar radiation and low wind speed are much more common during the development stage and less common during the decay stage.…”

Section: Introductionmentioning

confidence: 99%

“…Our focus on the atmospheric process of HE is independent from El Niño–Southern Oscillation since our HE detection method has excluded the seasonal and interannual effect as explained in Wirasatriya et al . [].…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric structure favoring high sea surface temperatures in the western equatorial Pacific

et al. 2016

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We investigated the atmospheric processes over high sea surface temperature called Hot Event (HE) in the western equatorial Pacific from climatological analysis and a case study of the HE which began on 28 May 2003 (hereafter, HE030528). Climatological analysis shows that during the development stage of HE, solar radiation inside the HE area is higher than its climatology and wind speed is lower than the decay stage. During the decay stage, strong westerly wind often occurs inside HE area. The case study of HE030528 shows that the suppressed convection above high SST area resulted from the deep convection from the northern and southern areas outside HE. The suppressed convection created a band‐shaped structure of low cloud cover along HE area increasing solar radiation during the development stage. Thus, the theory of “remote convection” was supported for the HE030528 formation mechanisms. The large sea level pressure gradient magnitude between the southern side of the terrain gap and the northern coast of the Solomon Islands, through which strong wind blew, indicated the role of land topography for the increase of wind speed during the decay of HE030528. Moreover, surface wind had an important role to influence the variability of solar radiation during the occurrence of HE030528 by controlling the water vapor supply in the upper troposphere through surface evaporation and surface convergence variation. Thus, surface wind was the key factor for HE030528 occurrence. The representativeness of HE030528 and the possible relation between HE and Madden‐Julian Oscillation are also discussed.

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Section: Data Set and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Atmospheric structure favoring high sea surface temperatures in the western equatorial Pacific

et al. 2016

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Thermal structure of hot events and their possible role in maintaining the warm isothermal layer in the Western Pacific warm pool

et al. 2020

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The short-lived events of high SST are called hot events (HEs) and can only be generated under the conditions of large daily heat gain due to strong solar radiation and weak wind. We investigated the thermal structure below HEs in the western equatorial Pacific by using in situ data obtained from TAO/TRITON buoys. We found that the occurrence of HEs can be identified by the typical vertical thermal structure within the isothermal layer. During the development stage of a HE, heat is accumulated in the surface layer due to strong solar radiation and weak wind, increasing temperature and creating strong stratification in the upper layer. During the decay stage, strong westerly winds induce current convergence which transports the heat from the upper layer to the deeper layer. Thus, temperature decreases at the surface and increases in the deeper layer. Furthermore, this mechanism indicates the important role of HEs in maintaining the warm isothermal layer in the western Pacific warm pool. The more HEs occur, the more heat in the surface layer gained from solar radiation is transported to the deeper layer. This process makes areas of frequent HE occurrences coincident with areas of warm pool. Since surface winds control the heat accumulation and heat transport in the isothermal layer by influencing current divergence and latent heat flux, surface winds become the key factor for the occurrence of HEs and the formation of the thermal structure in the Pacific warm pool.

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Satellite-borne detection of high diurnal amplitude of sea surface temperature in the seas west of the Tsugaru Strait, Japan, during Yamase wind season

et al. 2018

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Climatology of hot events in the western equatorial Pacific

Cited by 11 publications

References 28 publications

Atmospheric structure favoring high sea surface temperatures in the western equatorial Pacific

Atmospheric structure favoring high sea surface temperatures in the western equatorial Pacific

Thermal structure of hot events and their possible role in maintaining the warm isothermal layer in the Western Pacific warm pool

Satellite-borne detection of high diurnal amplitude of sea surface temperature in the seas west of the Tsugaru Strait, Japan, during Yamase wind season

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