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

Kunoki, Shiori; Manda, Atsuyoshi; Kodama, Y.; Iizuka, Satoshi; Sato, Kazutoshi; Fathrio, Ibnu; Mitsui, Taku; Seko, Hiromu; Moteki, Qoosaku; Minobe, Shoshiro; Tachibana, Yukio

doi:10.1002/2014jd022234

Cited by 20 publications

(15 citation statements)

References 42 publications

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“…The JOCPE data has assembled all available data obtained from satellites, ARGO floats, and ships in an ocean forecast system. This reanalysis data have horizontal high resolution of 1/12°, validated and applied in many researches with great performance [58,59]. Data of regional-averaged (in our research area) and monthly-averaged sea surface salinity (SSS) and sea surface temperature (SST) from the JOCPE data and our model results are compared (Figure 3a,b).…”

Section: Model Validationmentioning

confidence: 97%

Model-Based Evaluation of Hydroelectric Dam’s Impact on the Seasonal Variabilities of POC in Coastal Ocean: A Case Study of Three Gorges Project

Chen

Liu

et al. 2019

JMSE

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Particulate organic carbon (POC) plays an important role in the global carbon cycle. The POC in the Changjiang Estuary and adjacent coastal region of the East China Sea (ECS) is dominated by riverine input and marine production and is significantly influenced by the three gorges project (TGP). A coupled physical–biogeochemical model was used to evaluate TGP’s impact on POC. The results demonstrate that TGP regulates the area influenced by diluted water and POC through direct river and sediment discharge and affects the ecosystem. From the early to later TGP construction periods, the surface region with high-POC concentration (>40 μmol L−1) decreases by 20.5% in area and 11.5% in concentration. Meanwhile, POC in the whole water column decreases from 19.5 to 17.8 μmol L−1. By contrast, the concentrations of chlorophyll-a (Chl-a) and related nutrients increase. A three end-member mixing model based on quasi-conservative temperature and salinity is used to quantify relative contributions of different water sources to POC in our research area. We also estimate the biological POC production by the difference between the physical-biogeochemical model predicted POC and three end-member model mixing POC. The result demonstrate that under the regulation of TGP in the later period, the decrease of sediment load increases water transparency, which favors photosynthesis and oceanic biological produced POC. In addition, over 70% of the areas have C/Chl-a > 200 and high C/N ratios, which are circumstantial evidences that organic detritus and terrestrial input sources still dominate in the Changjiang Estuary and adjacent coastal ECS but are influenced by TGP’s regulation.

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Section: Model Validationmentioning

confidence: 97%

Model-Based Evaluation of Hydroelectric Dam’s Impact on the Seasonal Variabilities of POC in Coastal Ocean: A Case Study of Three Gorges Project

Chen

Liu

et al. 2019

JMSE

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“…of diabatic heating caused by changes in SST on the stationary linear convective system was not investigated in these studies, while previous studies pointed out the importance of SST (Tsuguti and Kato 2014a;Manda et al 2014;Kunoki et al 2015;Sato et al 2016), lower-tropospheric moisture (Peters et al 2017;Schumacher 2015;Schumacher and Peters 2017), and warm air advection (Peters and Schumacher 2015a, b) for such heavy rainfall events. The purpose of this study was to demonstrate the effect of accurate SST analysis on the analysis of the September 2015 Kanto-Tohoku heavy rainfall event that occurred in a stationary linear convective system over the Japanese archipelago between Kilo and the extratropical cyclone transited from Etau, particularly focusing on the stationary linear convective system across the Tochigi prefecture.…”

Section: Introductionmentioning

confidence: 95%

Air-Sea Coupled Data Assimilation Experiment for Typhoons Kilo, Etau and the September 2015 Kanto-Tohoku Heavy Rainfall with the Advanced Microwave Scanning Radiometer 2 Sea Surface Temperature

Wada¹,

Tsuguti

Okamoto³

et al. 2019

Journal of the Meteorological Society of Japan

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The September 2015 Kanto-Tohoku heavy rainfall event occurred in a stationary linear convective system between Typhoons Kilo and Etau. We investigated the influence of sea surface temperature (SST) on the local heavy rainfall event using a regional air-sea strongly coupled data assimilation system based on the local ensemble transform Kalman filter (LETKF) and a nonhydrostatic atmosphere model (NHM) coupled with an oceansurface wave model and a multilayer ocean model with an Advanced Microwave Scanning Radiometer 2 (AMSR2) level 2 (L2) SST product. From the validation of SST analyzed by the coupled data assimilation system with the Japanese geostationary multi-functional transport satellite 2 hourly SST product and in-situ observations at a moored buoy, we demonstrated that the coupled system with the AMSR2 L2 SST led to an improvement in the SST analysis. Based on the verification using radiosonde observations and radar-rain gauge rainfall analysis, the analysis of the lower-atmospheric components was improved by the air-sea coupled NHM-LETKF. The local torrential rainfall event that occurred around 37°N in the Tochigi prefecture was embedded in a stationary linear convective system. The location of the linear convective system corresponded to the synoptic-scale convergence area between the cyclonic circulation associated with Etau and easterly lower-tropospheric winds. Strong southerly winds associated with Etau caused a periodic enhancement of local convection along the convergence area on the upwind side of the linear convective system and resulted in a wave-like train of the total water content around an altitude of 4-8 km on the leeward side. The improvement of SST analysis could not only change the transition of Etau to the extratropical cyclone but also the lower-tropospheric wind field and thereby

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“…대기-해양 상호작용은 대서양의 멕시코 만류 (Gulf stream)나 태평양의 쿠로시오 해류(Kuroshio current)와 같은 서안 경계류에서 특히 강하게 나타나 며 (Wallace and Hobbs, 2006), 서안 경계류는 엄청난 에너지를 저위도에서 고위도로 전달하고 대기에 강한 잠열 및 현열 플럭스를 전달한다 (Hsiung et al, 1985). 따라서 기상 및 기후 시스템의 이해와 정확한 예측을 위해서는 대기-해양 상호작용을 정확히 이해해야 한 다 (Liu et al, 1979;Oh and Ha, 2005;Oh et al, 2007Oh et al, , 2010de Szoeke et al, 2015;Kunoki et (Li et al, 2004;Tokinaga et al, 2009;Xu et al, 2011 (1)…”

Section: 서 론unclassified

Observation and Analysis of Turbulent Fluxes Observed at Ieodo Ocean Research Station in Autumn 2014

Yun

Oh²,

Ha³

2015

Atmosphere

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This study investigates the characteristics of turbulent fluxes observed at Ieodo Ocean Research Station (IORS) in autumn 2014. The 10 Hz IORS data is quality controlled and calculated to be the 30 minutes turbulent fluxes. The quality control consists of five steps: a weather check, Vickers and Mahrt (VM) sequential check, VM parallel check, flag check, and direction check. Since the IORS is an open-sea station with no orographic influence, there are no significant diurnal variations for the turbulent fluxes and 10 m wind speed. According to stabilities, the unstable and semi-unstable states appear more than 28% and 70% in autumn, respectively and they have strong winds of over 10 m s −1 . In addition, the turbulent fluxes increase with increasing wind speed. In particular, the latent heat flux and its deviations are clearly shown because the latent heat flux is influenced by the change of both the sea surface roughness and wave height induced by the wind. To demonstrate the changes of the turbulent fluxes before and after typhoon, Vongpong (1419), which is the most intense typhoon affecting the Korean Peninsula in 2014, is considered. The turbulent flux fluctuates in accordance with the location of Vongpong. The turbulent fluxes have a large (small) variation when Vongpong approaches (retreats) at the IORS. The overall results represent that the IORS data helps us understand physical processes related to air-sea interaction by providing the valuable and reliable observed data.

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

Cited by 20 publications

References 42 publications

Model-Based Evaluation of Hydroelectric Dam’s Impact on the Seasonal Variabilities of POC in Coastal Ocean: A Case Study of Three Gorges Project

Model-Based Evaluation of Hydroelectric Dam’s Impact on the Seasonal Variabilities of POC in Coastal Ocean: A Case Study of Three Gorges Project

Air-Sea Coupled Data Assimilation Experiment for Typhoons Kilo, Etau and the September 2015 Kanto-Tohoku Heavy Rainfall with the Advanced Microwave Scanning Radiometer 2 Sea Surface Temperature

Observation and Analysis of Turbulent Fluxes Observed at Ieodo Ocean Research Station in Autumn 2014

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