Objective detection of the Kunming quasi-stationary front

Zhao, Di; Yang, Ruowen; Yun, Tae-Jin; Zhang, Wei Kang; He, Xu‐Cheng

doi:10.1007/s00704-019-02894-w

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…From the residual phase results, owing to the spatial and temporal randomness of the turbulent mixing delay, none of the three tropospheric delay correction methods can accurately identify or attenuate this error. As shown in Figure 5, the interferogram phases and elevations were negatively correlated in both regions before the tropospheric delay correction, a phenomenon that may be due to the topographic relief or solar radiation variations caused by quasi−stationary frontal weather systems [34]. The absolute value of the Pearson correlation coefficient between the original phase and the elevation of the interferogram in Binchuan area is as high as 0.84, and the atmospheric delay phase is strongly correlated with the terrain.…”

Section: Binchuan and Eryuan In Springmentioning

confidence: 92%

Evaluation of InSAR Tropospheric Delay Correction Methods in the Plateau Monsoon Climate Region Considering Spatial–Temporal Variability

Yang,

Zuo,

Guo

et al. 2023

Sensors

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The tropospheric delay caused by the temporal and spatial variation of meteorological parameters is the main error source in interferometric synthetic aperture radar (InSAR) applications for geodesy. To minimize the impact of tropospheric delay errors, it is necessary to select the appropriate tropospheric delay correction method for different regions. In this study, the interferogram results of the InSAR, corrected for tropospheric delay using the Linear, Generic Atmospheric Correction Online Service for InSAR (GACOS) and ERA-5 atmospheric reanalysis dataset (ERA5) methods, are presented for the study area of the junction of the Hengduan Mountains and the Yunnan–Kweichow Plateau, which is significantly influenced by the plateau monsoon climate. Four representative regions, Eryuan, Binchuan, Dali, and Yangbi, are selected for the study and analysis. The phase standard deviation (STD), phase–height correlation, and global navigation satellite system (GNSS) data were used to evaluate the effect of tropospheric delay correction by integrating topographic, seasonal, and meteorological factors. The results show that all three methods can attenuate the tropospheric delay, but the correction effect varies with spatial and temporal characteristics.

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Section: Binchuan and Eryuan In Springmentioning

confidence: 92%

Evaluation of InSAR Tropospheric Delay Correction Methods in the Plateau Monsoon Climate Region Considering Spatial–Temporal Variability

Yang,

Zuo,

Guo

et al. 2023

Sensors

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show abstract

“…During the past decades, how to objectively identify fronts on the isobaric surface were widely discussed (Renard and Clarke 1965;Hewson, 1998;McCann and Whistler 2001;Hope et al 2014). Based on the thermodynamic method proposed by Hewson (1998), Zhao et al (2019) recognized three YGQSF events occurring at 850 hPa in early 2008. However, this single-isobaric-surface-based method is not applicable anymore when YGQSF moves westward to higher land.…”

Section: Introductionmentioning

confidence: 99%

A Climate Perspective of the Quasi-Stationary Front in Southwestern China: Structure, Variation and Impact

Cai

Yang

Tao

et al. 2021

Preprint

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Yunnan-Guizhou quasi-stationary front (YGQSF) is a unique weather phenomenon that frequently occurs during winter half year over the Yunnan-Guizhou Plateau in southwestern China. Most of previous studies analyzed it only with synoptic cases. This study investigates the structure, variation, and impact of YGQSF from a climate perspective, using long-term high-resolution atmospheric reanalysis and high-density station records for 1981-2016. An objective method quantifying YGQSF is proposed and three indexes are defined to measure the intensity, frequency, and location of YGQSF, respectively, with the horizontal gradient of air potential temperature at a terrain-following level of sigma 0.995. With these indexes, climatological structure, subseasonal variability as well as climatic impact of YGQSF are comprehensively examined. In climatology, YGQSF as a north-south-oriented low-level front is found to occur the most frequently during January-February-March (JFM), determined predominately by the coldness from the east of the front. The structure of YGQSF identified essentially reflects an obstruction of high-terrain Yunnan (the western part of the plateau) to the low-level cold air mass, which makes near-surface cold northeasterly winds cease westward intruding and veer upward over relatively low-terrain Guizhou, transporting moisture upward and forming low clouds. A sharp climate contrast is thus formed between two sides of YGQSF: cold, sunless, and continuously rainy Guizhou versus warm and sunny Yunnan. Furthermore, YGQSF features significant subseasonal variations with periods at around 30d and 60d largely in its intensity. Anomalously strong YGQSF events which are caused 75% by the cold anomaly from the east but less than 17% by the warm anomaly from the west yield different anomalous structures, but consistently amplify the sharp climate contrast between Yunnan and Guizhou.

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Interannual variability of the occurrence frequency of the stronger Kunming quasi‐stationary front in winter

Du,

Dai,

Cao

et al. 2024

Intl Journal of Climatology

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Using ERA5 reanalysis data, this study explores the interannual variability of the occurrence frequency of the stronger Kunming quasi‐stationary front during in winter over the period 1980–2021 and the main causes of the variability. The results indicate that the occurrence frequency is significantly modulated on interannual timescales by southwesterly anomalies over the warmer region west of 103° E and northeasterly anomalies over the colder region east of 106° E. When the stronger southwesterly anomalies over the warmer region are comparable with stronger northeasterly anomalies over the colder region, the inhomogeneities of horizontal convergence and diabatic heating are strengthened near the frontal zone. This anomalous circulation causes a higher‐than‐normal occurrence frequency of the stronger Kunming quasi‐stationary front in winter. The East Asian winter monsoon (EAWM) and circumglobal teleconnection (CGT) are the two most important controls on the interannual variability of the occurrence frequency of the stronger Kunming quasi‐stationary front. Both the CGT and EAWM modulate the inhomogeneities of horizontal convergence and diabatic heating on the west flank of the front, and the EAWM further regulates diabatic heating over the east flank of the front.

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Objective detection of the Kunming quasi-stationary front

Cited by 5 publications

References 19 publications

Evaluation of InSAR Tropospheric Delay Correction Methods in the Plateau Monsoon Climate Region Considering Spatial–Temporal Variability

Evaluation of InSAR Tropospheric Delay Correction Methods in the Plateau Monsoon Climate Region Considering Spatial–Temporal Variability

A Climate Perspective of the Quasi-Stationary Front in Southwestern China: Structure, Variation and Impact

Interannual variability of the occurrence frequency of the stronger Kunming quasi‐stationary front in winter

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