Near inertial motion excited by wind change in a margin of the Typhoon 9019

Maeda, Akio; Uejima, Kazuki; Yamashiro, Toru; Sakurai, Masahito; Ichikawa, Hiroshi; Chaen, Masaki; Taira, Keisuke; Mizuno, Shinjirou

doi:10.1007/bf02235931

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…Because the translation speed of most TCs is greater than the local first baroclinic wave speed (e.g. Zhang et al 2020b), we usually find a near-inertial current response after the TC passage (Pollard 1970;Maeda et al 1996;Firing et al 1997;Jarosz et al 2007;Xu et al 2019). The upper ocean near-inertial current response to a TC can be divided into mixed layer current and thermocline current (Price 1981;Price et al 1994;Zhang et al 2016aZhang et al , 2019.…”

Section: Current Responsementioning

confidence: 80%

Upper ocean response to tropical cyclones: a review

Zhang

et al. 2021

Geosci. Lett.

101

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Tropical cyclones (TCs) are strong natural hazards that are important for local and global air–sea interactions. This manuscript briefly reviews the knowledge about the upper ocean responses to TCs, including the current, surface wave, temperature, salinity and biological responses. TCs usually cause upper ocean near-inertial currents, increase strong surface waves, cool the surface ocean, warm subsurface ocean, increase sea surface salinity and decrease subsurface salinity, causing plankton blooms. The upper ocean response to TCs is controlled by TC-induced mixing, advection and surface flux, which usually bias to the right (left) side of the TC track in the Northern (Southern) Hemisphere. The upper ocean response usually recovers in several days to several weeks. The characteristics of the upper ocean response mainly depend on the TC parameters (e.g. TC intensity, translation speed and size) and environmental parameters (e.g. ocean stratification and eddies). In recent decades, our knowledge of the upper ocean response to TCs has improved because of the development of observation methods and numerical models. More processes of the upper ocean response to TCs can be studied by researchers in the future.

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Section: Current Responsementioning

confidence: 80%

Upper ocean response to tropical cyclones: a review

Zhang

et al. 2021

Geosci. Lett.

101

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“…The period from 20 to 22 September also included a slow cooling of the mixed layer, and a vertical spreading in the isotherms in the 25°-26°C range, i.e., a decrease in the thermal stratification in the upper portion of the thermocline. Similarly, Maeda et al [1996] documented the onset of prominent near-inertial oscillations with a sudden decrease in the winds associated with a typhoon.…”

Section: Evolution Of Upper Ocean Conditionsmentioning

confidence: 94%

Upper ocean response to Typhoon Choi-Wan as measured by the Kuroshio Extension Observatory mooring

et al. 2011

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The Kuroshio Extension Observatory (KEO) is a highly instrumented moored reference station located at 32.3°N, 144.5°E in the recirculation gyre south of the Kuroshio Extension. On 19 September 2009, the eye of Typhoon Choi‐Wan (International designation: 0914) passed ∼40 km to the southeast of the KEO surface mooring. Hourly meteorological and physical oceanographic measurements together with 3 hourly air‐sea carbon dioxide observations telemetered from KEO in near real time show the evolution of the upper ocean and its associated air‐sea fluxes during the passage of this storm and its aftermath. During the approach of the storm, the mixed layer freshened because of intense rainfall. This was followed by a large outgassing of CO2, rapid cooling, and an increase in salinity. Although these changes in mixed layer properties imply substantial entrainment, they were accompanied by upwelling and ultimately a temporary ∼20 m shoaling of the mixed layer. This upwelling, which was observed at all depths, including the deepest sensor near 500 m, was coincident with the onset of near‐inertial oscillations in the mixed layer currents. After the typhoon passed, inertial pumping caused ∼15–20 m amplitude vertical displacements throughout the top 500 m that continued for at least 6 days. A large oceanic response was observed in this case even though the eye of Choi‐Wan passed to the right of KEO, resulting in winds rotating cyclonically with time, in opposition to the anticyclonic‐rotating near‐inertial currents.

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“…The NIWs exist everywhere in the ocean except at the equator (Jeon et al, 2019). When wind with a high spatiotemporal variation acts on the upper ocean, it will generate a flow with a near-inertial period (Maeda et al, 1996;Guan et al, 2014). Therefore, one of the main dynamic responses of the ocean to tropical cyclones is the generation of NIWs (Price et al, 1994;Garrett, 2003;Yang and Hou, 2014).…”

Section: Introductionmentioning

confidence: 99%

Poleward Propagation of Typhoon-Induced Near-Inertial Waves in the Northern South China Sea

Ruhui

Xie

et al. 2021

Front. Mar. Sci.

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One of the main responses of the ocean to typhoons is the generation of near-inertial waves (NIWs), whose intrinsic frequency is close to the local inertial frequency. Based on the mooring observations, we carefully investigated the spatial–temporal variations in NIWs in the northern South China Sea (SCS) after Typhoon “Haima,” which passed through the northern SCS from October 20 to 21, 2016, with its track parallel to the mooring array on its northeast side. Moorings in different locations responded differently to this typhoon, with stronger NIWs found on the continental slope to the shelf break and relatively weak NIWs found on the shallow continental shelf. Strong NIWs appeared twice within a short period and showed different characteristics and frequencies. The first NIWs were generated locally with blue-shifted (super-inertial) frequencies. These initial NIWs were dominated by the first three baroclinic modes and rapidly weakened due to their propagation away and local dissipation. However, the second NIWs mainly consisted of higher baroclinic modes with red-shifted (sub-inertial) frequencies. The analysis of the mean background flow revealed that these red-shifted NIWs were excited at low latitudes, and subsequently advected by the poleward background flow to moorings whose latitudes were higher than their critical latitudes. Higher-mode (n > 3) NIWs were more easily carried away by mean background flow, and, at the same time, high-mode NIWs propagated downward to the subsurface layer, leading to the significant elevation of velocity shear therein. Given these findings, the mean background flow may provide an important route to redistributing the energy of the upper ocean imported from typhoons.

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Near inertial motion excited by wind change in a margin of the Typhoon 9019

Cited by 10 publications

References 9 publications

Upper ocean response to tropical cyclones: a review

Upper ocean response to tropical cyclones: a review

Upper ocean response to Typhoon Choi-Wan as measured by the Kuroshio Extension Observatory mooring

Poleward Propagation of Typhoon-Induced Near-Inertial Waves in the Northern South China Sea

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