Remote Thermodynamic Impact of the Kuroshio Current on a Developing Tropical Cyclone Over the Western North Pacific in Boreal Fall

Fujiwara, K.; Kawamura, Ryuichi; Kawano, Tetsuya

doi:10.1029/2019jd031356

Cited by 12 publications

(7 citation statements)

References 36 publications

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“…Recently, Fujiwara et al. (2020a, hereafter F20a, and 2020b, hereafter F20b) reported a new perspective on the relationship between the moisture influx from remote oceans and TC development. Their studies focused on a typical severe typhoon approaching Japan in October, Typhoon Chaba (2010).…”

Section: Introductionmentioning

confidence: 99%

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Fujiwara

Kawamura

2021

JGR Atmospheres

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This study examined the active role of sea surface temperature (SST) changes over the Kuroshio in the development of distant tropical cyclones (TCs) approaching Japan in October, using a cloud‐resolving model. We designed a real SST experiment and SST sensitivity runs by adding and subtracting SST anomalies equivalent to a spread of year‐to‐year October‐mean Kuroshio's SST changes. Under a synoptic environment that low‐level northeasterlies prevailed over the Kuroshio, systematic differences in TC intensity between the real and modified SST runs were simulated despite the developing TCs being far away from the modified SST areas. In the warm (cool) SST runs, active (inactive) moisture import from the Kuroshio increased (decreased) the equivalent potential temperature within the planetary boundary layer (PBL) in the inner core, thereby enhancing (weakening) the latent eyewall heating and the associated secondary circulation. The differences in the secondary circulation led to those in the inward advection of absolute angular momentum in the PBL, affecting a vortex spin‐up in the inner core. We also found that the surface heat and moisture supply from the Kuroshio facilitated the warming and moistening processes of midlatitude air parcels traveling over the underlying current, causing further reinforcement of the moisture import into the distant TC. These thermodynamic processes were more and less apparent in the warm and cool SST runs, respectively. Since the synoptic environment in this study often arises in boreal fall, the Kuroshio's SST warming in recent decades may influence the intensities of TCs approaching Japan in fall.

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Section: Introductionmentioning

confidence: 99%

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Fujiwara

Kawamura

2021

JGR Atmospheres

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“…Therefore, further observation-and simulation-based studies of typhoons are required to elucidate the relationship between oceanic heat flux and typhoon intensity, with more typhoon cases during the late summer and early autumn seasons. For instance, Fujiwara et al [45] performed sensitivity experiments for typhoon Chaba (2010) to investigate the remote contribution of the Kuroshio current to tropical cyclone development by controlling the LHF over the Kuroshio current region, and found the importance of moisture supply for typhoon intensification.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Satellite-Based Ocean Turbulent Heat Flux around the Korean Peninsula and Relationship with Changes in Typhoon Intensity

Kim

Lee

2020

Remote Sensing

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Ocean-atmosphere energy exchange is an important factor in the maintenance of oceanic and atmospheric circulation and the regulation of meteorological and climate systems. Oceanic sensible and latent heat fluxes around the Korean Peninsula were determined using satellite-based air-sea variables (wind speed, sea surface temperature, and atmospheric specific humidity and temperature) and the coupled ocean-atmosphere response experiment (COARE) 3.5 bulk algorithm for six years between 2014 and 2019. Seasonal characteristics of the marine heat flux and its short-term fluctuations during summer typhoons were also investigated. air-sea variables were produced through empirical relationships and verified with observational data from marine buoys around the Korean Peninsula. Satellite-derived wind speed, sea surface temperature, atmospheric specific humidity, and air temperature were strongly correlated with buoy data, with R2 values of 0.80, 0.97, 0.90, and 0.91, respectively. Satellite-based sensible and latent heat fluxes around the peninsula were also validated against fluxes calculated from marine buoy data, and displayed low values in summer and higher values in autumn and winter as the difference between air-sea temperature and specific humidity increased. Through analyses of spatio-temporal fluctuations in the oceanic turbulent heat flux and variations in intensities of typhoons, this study assessed the possibility of monitoring air-sea energy exchange using satellite-based ocean turbulent heat fluxes during high-impact weather.

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“…The above results are supported by observations: reduced THF in the cold wakes and enhanced THF over the Kuroshio can be seen in reanalysis data (Figures 11 and 13), despite the magnitude smaller than the simulation. Previous studies have demonstrated the role of the latent heat flux in the Kuroshio region in typhoon intensification: for instance, the rapid intensification of typhoon Man-yi (2013) over the Kuroshio (Wada, 2015) and the development of typhoon Chaba (2010) in the south of the Kuroshio by about 500 km (Fujiwara et al, 2020a(Fujiwara et al, , 2020b have been attributed to the latent heat flux in the Kuroshio region. These findings suggest that the sustained high SST in the Kuroshio region during the passages of SOULIK and CIMARON could potentially influence JEBI through the release of latent heat, although in the case of JEBI, no impact on the typhoon intensity was identified (see Section 4.2).…”

Section: Atmospheric Response Around Jebi To the Sst Field Behind Sou...mentioning

confidence: 99%

“…The findings of these studies suggest that it is plausible that feedback from the ocean surface layer to typhoons over the Kuroshio and KE differs from that in other subtropical regions. In fact, significant intensification of typhoons over or near the Kuroshio has been reported (Wada, 2015;Wada et al, 2013;Fujiwara et al, 2020aFujiwara et al, , 2020b. However, because such typhoon responses to the Kuroshio are rare, more case studies are needed to advance our knowledge of ocean-typhoon interactions in the Kuroshio and KE region.…”

mentioning

confidence: 99%

Interactions Between Ocean and Successive Typhoons in the Kuroshio Region in 2018 in Atmosphere–Ocean Coupled Model Simulations

Kawakami¹,

Nakano²,

Urakawa³

et al. 2022

JGR Oceans

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Typhoons decrease sea surface temperature (SST) along their wakes through upwelling of subsurface water, vertical mixing in the upper ocean, and heat release from the sea surface, and these cold wakes can influence subsequent typhoons. In this study, we investigated interactions between the upper ocean and typhoons in the North Pacific subtropical gyre with focuses on Kuroshio's response and feedback using atmosphere–ocean coupled model simulations. In late August and early September 2018, typhoons SOULIK, CIMARON, and JEBI passed through the northwestern subtropical gyre. During the passages of SOULIK and CIMARON, SST decreased along their paths due to vertical mixing except in the Kuroshio region. We quantitatively revealed that the Kuroshio stayed warm because the deep mixed layer along its path and small vertical temperature gradient around the mixed layer base, which are unfavorable conditions for cooling by vertical mixing, limited the cooling effects. After SOULIK and CIMARON had passed, SST recovered through horizontal Kuroshio heat transport and radiative heating. The possibility that the SST field after SOULIK and CIMARON passages influences JEBI was also discussed. Although impacts on JEBI intensity were not identified, it is implied that the turbulent heat flux (THF; sum of the sensible and latent heat fluxes) around JEBI was modulated by the SST field: heat release from the ocean was reduced in the region with decreased SST and enhanced over the sustained high SST of the Kuroshio. Furthermore, the large THF over the Kuroshio may have caused an increase of JEBI‐associated precipitation around Japan.

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Remote Thermodynamic Impact of the Kuroshio Current on a Developing Tropical Cyclone Over the Western North Pacific in Boreal Fall

Cited by 12 publications

References 36 publications

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Characteristics of Satellite-Based Ocean Turbulent Heat Flux around the Korean Peninsula and Relationship with Changes in Typhoon Intensity

Interactions Between Ocean and Successive Typhoons in the Kuroshio Region in 2018 in Atmosphere–Ocean Coupled Model Simulations

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