Temperature inversion in China seas

Hao, Jiajia; Chen, Yongli; Wang, Fan

doi:10.1029/2010jc006297

Cited by 32 publications

(31 citation statements)

References 21 publications

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“…Although temperature usually decreases with increasing depth, this normal temperature profile is not always maintained in the YS. Temperature inversion is a phenomenon where the temperature at deeper depths is higher than that at shallower depths, and this has been seen to frequently occur in two areas around the Shandong Peninsula and southwest of the Korean Peninsula [ Kim et al ., ; Hao et al ., ]. Recently, Lie et al .…”

Section: Introductionmentioning

confidence: 99%

Occurrence of large temperature inversion in the thermohaline frontal zone at the Yellow Sea entrance in winter and its relation to advection

2015

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Temperature inversion (higher temperature at a deeper depth) in winter and its relation to advection were investigated by analyzing both conductivity-temperature-depth data in the southern Yellow Sea (YS) and northwestern East China Sea during the winter of 2002-2003 and time series data of temperature, salinity, and currents at a buoy station at the YS entrance. Significant temperature inversions occur predominantly along the thermohaline front at the YS entrance where the Cheju Warm Current Water (CWCW) and the cold coastal waters meet. In February 2003, on the northern frontal zone along 34 N where isotherms and isohalines declined downward to the north, particularly large inversions with temperature differences of larger than 2.0 C were observed to occur more in troughs than in the crests of the wave-like frontal meander where the cold Korean coastal water (KCW) advances farther southward. The inversion persisted until mid-April at the buoy station in the frontal zone, and both temperature and salinity showed simultaneous variations in the same manner. During episodic occurrences of large inversions, temperature and salinity decreased sharply in the upper layer, but increased concurrently in the lower layer. These episodic inversions were found to be closely related to the westward advection of the KCW in the upper layer and the northward advection of the CWCW in the lower layer. It is considered that these advections may play an important role in maintaining baroclinicity in the northern frontal zone, which is responsible for driving the westward transversal flow across the YS entrance.

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Section: Introductionmentioning

confidence: 99%

Occurrence of large temperature inversion in the thermohaline frontal zone at the Yellow Sea entrance in winter and its relation to advection

2015

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“…Previous studies based on limited in situ hydrographic data showed that a temperature inversion is frequently observed in the thermohaline frontal area southwest of Korea during wintertime [ Kim et al ., ; Hao et al ., ; Lie et al ., ]. In this paper, we reveal how the temperature inversion evolves during wintertime when northerly winds prevail over the YS, and explain the dynamics associated with ocean circulations driven by surface wind forcing.…”

Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The presence of a temperature inversion can be a manifestation of the prevailing ocean circulation over a region, and therefore an understanding of the structure and mechanism causing temperature inversions is necessary to realistically explain physical processes in oceanic regions. A temperature inversion has been frequently observed during winter in the thermohaline frontal area southwest of Korea [Kim et al, 1982;Hao et al, 2010;Lie et al, 2015]. Based on a Korean serial hydrographic data set (1965)(1966)(1967)(1968)(1969)(1970)(1971)(1972)(1973)(1974)(1975)(1976)(1977)(1978)(1979), Kim et al [1982] reported high-frequency occurrences of this temperature inversion southwest of Korea during winter, and suggested that it is related to surface cooling and the southward advection of cold water.…”

Section: Introductionmentioning

confidence: 99%

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Modeling temperature inversion in southeastern Yellow Sea during winter 2016

et al. 2017

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A significant temperature inversion with temperature differences larger than 3°C was observed in the southeastern Yellow Sea (YS) during February 2016. By analyzing in situ hydrographic profiles and results from a regional ocean model for the YS, this study examines the spatiotemporal evolution of the temperature inversion and its connection with wind‐induced currents in winter. Observations reveal that in winter, when the northwesterly wind prevails over the YS, the temperature inversion occurs largely at the frontal zone southwest of Korea where warm/saline water of a Kuroshio origin meets cold/fresh coastal water. Our model successfully captures the temperature inversion observed in the winter of 2016 and suggests a close relation between northwesterly wind bursts and the occurrence of the large inversion. In this respect, the strong northwesterly wind drove cold coastal water southward in the upper layer via Ekman transport, which pushed the water mass southward and increased the sea level slope in the frontal zone in southeastern YS. The intensified sea level slope propagated northward away from the frontal zone as a shelf wave, causing a northward upwind flow response along the YS trough in the lower layer, thereby resulting in the large temperature inversion. Diagnostic analysis of the momentum balance shows that the westward pressure gradient, which developed with shelf wave propagation along the YS trough, was balanced with the Coriolis force in accordance with the northward upwind current in and around the inversion area.

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“…However, at some depths, the water temperature of the middle and lower layers sometimes rises above that of the upper layer, which is called a water temperature inversion (TI). The causes of this water temperature inversion layer (TIL) may be due to: (1) Near heat loss from the sea surface [1], (2) wind-driven current moving from a cold water area to a warm water area [2], and (3) mixing process in the front area [3]. A TIL mainly occurs in coastal upwelling areas [4] and in polar fronts [3], where different water masses meet, and complex marine physical characteristics, such as water temperature fronts, are found near the boundaries of these areas [5].…”

Section: Introductionmentioning

confidence: 99%

Study on the Behavior of the Water Temperature Inversion Layer in the Northern East China Sea

Kim

Choi

Kim

2020

JMSE

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To investigate the behavioral characteristics of the water temperature inversion layer (TIL), we used data (KODC) from areas in the Northern East China Sea from 1995 to 2016. Water temperature and salinity surveys were conducted 8820 casts over 22 years. Of these, 1589 water temperature inversion layers were found, and the probability of occurrence was 18.0%. In the Gageo island, probability of TIL occurrence in winter was 25 times higher than in summer. On the other hand, in the south of Jeju Island, summer values were 3.7 times higher than winter values. A T-S diagram analysis shows the components of the water temperature inversion layers. Yellow Sea Cold Water was mainly found in the winter, while Jeju Warm Currents and Tsushima Warm Currents were found in summer. The correlation between the probability of the occurrence of a monthly water temperature inversion layer and the amount of seawater volume transported into the study area was analyzed. The correlation coefficient was higher than r = 0.8 in parts of southern Jeju Island. On the other hand, the correlation coefficient was r = −0.6 in the Gageo Island. The spatial correlation index for the seawater volume transport and the water temperature inversion layer is presented.

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Temperature inversion in China seas

Cited by 32 publications

References 21 publications

Occurrence of large temperature inversion in the thermohaline frontal zone at the Yellow Sea entrance in winter and its relation to advection

Occurrence of large temperature inversion in the thermohaline frontal zone at the Yellow Sea entrance in winter and its relation to advection

Modeling temperature inversion in southeastern Yellow Sea during winter 2016

Study on the Behavior of the Water Temperature Inversion Layer in the Northern East China Sea

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