Seasonal Migration of the Baiu Frontal Zone over the East China Sea: Sea Surface Temperature Effect

Moteki, Qoosaku; Manda, Atsuyoshi

doi:10.2151/sola.2013-005

Cited by 17 publications

(19 citation statements)

References 19 publications

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“…The positive precipitation moves to the northern part of the Korean Peninsula or farther northward around late July (20-29 July) and becomes weaker thereafter. This northward migration of positive precipitation occurring in the Korean Peninsula from the middle of June to late July is related to the changma front and is an important characteristic of early summer precipitation in this region (Lee and Seo 2013;Moteki and Manda 2013).…”

Section: B Bcm Frontmentioning

confidence: 92%

Changes of Early Summer Precipitation in the Korean Peninsula and Nearby Regions Based on RCP Simulations

Hong

Ahn

2015

Journal of Climate

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In this study, the projected regional precipitation changes over northeast Asia (NEA) during early summer [May–July (MJJ)] for the late twenty-first century (2071–2100) were investigated using a high-resolution regional climate model (WRF3.4) based on the representative concentration pathways (RCPs) induced by the global circulation model (HadGEM2-AO). The increased horizontal resolution of the regional model with a 12.5-km horizontal resolution enabled it to reproduce the terrain-following features reasonably well compared to low-resolution reanalysis and HadGEM2-AO model data. The results of a regionally downscaled historical (1981–2010) experiment (D_Historical) demonstrated the model’s ability to capture the spatial and temporal variations of rainband migrating meridionally during MJJ over NEA. According to the regional model projection, intensive precipitation will increase and the rainband will affect the Korean Peninsula approximately 10 days earlier than in the D_Historical cases in both RCP4.5 and RCP8.5 (2071–2100). The precipitation will also increase in most of the domain, particularly in the southern Korean Peninsula and Kyushu, Japan. These increases in precipitation are attributed to increases in the northward moist transport coming from the lower latitudes and moist static instability in the lower atmosphere. According to this study, the convective precipitation contributes mainly to the increase in total precipitation. On the other hand, the large-scale nonconvective precipitation related to the stationary front will not change significantly but even tends to decrease approximately from the middle of July. The extreme precipitation intensity is also projected to increase by at least 22% (38%) in RCP4.5 (RCP8.5).

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Section: B Bcm Frontmentioning

confidence: 92%

Changes of Early Summer Precipitation in the Korean Peninsula and Nearby Regions Based on RCP Simulations

Hong

Ahn

2015

Journal of Climate

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“…Recent studies have pointed out the effects of SST variation in the ECS on the Baiu front. Moteki and Manda [2013] revealed a close relationship between seasonal migrations of the BFZ and SST on both climatological and synoptic timescales, suggesting the importance of surface heat fluxes over the ECS in seasonal migrations of the Baiu front. Kuwano-Yoshida et al [2013] demonstrated that surface evaporation over the warm ocean current was important for maintenance of the quasi-stationary BFZ.…”

Section: Introductionmentioning

confidence: 83%

“…Although the Baiu front is depicted as a stationary front on operational weather charts, the BFZ has strong variations in space and time [e.g., Ninomiya, 1984;Ninomiya and Akiyama, 1992;Ninomiya and Shibagaki, 2007;Moteki et al, 2004aMoteki et al, , 2004bMoteki et al, , 2006Maeda et al, 2008;Moteki and Manda, 2013]. The SST field in the northeastern ECS also exhibits large spatiotemporal variations.…”

Section: Summary and Discussionmentioning

confidence: 99%

Oceanic influence on the Baiu frontal zone in the East China Sea

et al. 2015

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A high-resolution transect of atmospheric soundings across the Kuroshio Current in the East China Sea was conducted onboard a ship in June 2012 with the objective of analyzing the influence of the complex sea surface temperature (SST) distribution on the Baiu frontal zone (BFZ). Expendable bathythermograph castings and continuous surface meteorological observations were also examined. Two distinct mesoscale atmospheric fronts, characterized by changes of wind direction in the lower troposphere and surface air temperature, were found in the BFZ. One (northern) atmospheric front was observed around the SST front in relation to a warm water tongue extending from the Kuroshio. A high SST region around the northern atmospheric front enhances unstable near surface stratification and intensifies turbulent heat flux. They help modify the marine atmospheric boundary layer in the BFZ. The other (southern) atmospheric front was at the southern end of the BFZ. Intense evaporation over the Kuroshio and moisture transport by southerly winds were important in forming the conditionally unstable air masses in the lower troposphere of the BFZ.

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“…A recent study further discussed an anchoring effect of the SST front on low‐level storm tracks and eddy‐driven polar front jets [ Ogawa et al ., ]. Several regional studies have also shown that the seawater temperature field strongly affects meteorological disturbances [e.g., Yamamoto and Hirose , ; Moteki and Manda , ]. The importance of the frontal SST gradient has also been demonstrated in many studies [e.g., Nonaka et al ., ; Sampe et al ., ].…”

Section: Introductionmentioning

confidence: 93%

Frontogenesis and frontolysis of the subpolar front in the surface mixed layer of the Japan Sea

2014

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The frontogenesis and frontolysis processes of the subpolar front (SPF) in the surface mixed layer of the Japan Sea are investigated using state-of-the-art oceanic reanalysis data. The SPF experiences a 9 month weakening period from January to September, which shifts to a strengthening period in October. Our analysis shows that horizontal advection consistently contributes to the intensification of the SPF. After September, as the weakening effect of surface heat flux diminishes, horizontal advection becomes the dominant factor that contributes to changes in the SPF strength. Thus, the SPF enters a 3 month strengthening period. The geostrophic component of horizontal advection provides the most important contribution to strengthening the SPF, acting to intensify the SPF year-round. Ekman advection also promotes SPF strengthening with a smaller but still important contribution. During the weakening period, SPF strength is largely controlled by heat flux. The heat flux, especially the shortwave radiation component, is the primary cause of the surface front disappearance in the summer.

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Seasonal Migration of the Baiu Frontal Zone over the East China Sea: Sea Surface Temperature Effect

Cited by 17 publications

References 19 publications

Changes of Early Summer Precipitation in the Korean Peninsula and Nearby Regions Based on RCP Simulations

Changes of Early Summer Precipitation in the Korean Peninsula and Nearby Regions Based on RCP Simulations

Oceanic influence on the Baiu frontal zone in the East China Sea

Frontogenesis and frontolysis of the subpolar front in the surface mixed layer of the Japan Sea

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