Analysis of the FGOALS Simulation on East Asian Westerly Jet in CMIP5 during the Meiyu Season

Yin, Dulin; Xie, Z.

doi:10.18178/ijesd.2017.8.4.967

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…Present-day observations reveal a close connection between the zonal position of the AWJ core and EASM precipitation at a decadal timescale during the past 60 years, which has also been found by previous studies at seasonal and interannual timescales (Du et al, 2009;Du & Xie, 2017;Lin et al, 2019;Xie et al, 2015). Our CESM and KCM simulations validate this connection at an orbital timescale by showing the eastward displacement of the AWJ core was associated with increased (decreased) summer precipitation in central (southern) China through the Holocene.…”

Section: Mechanisms Of the Awj-easm Connection During The Holocenesupporting

confidence: 87%

“…In addition to the meridional movement, the AWJ displays notable zonal variations at seasonal and interannual timescales, exerting significant influence on EASM precipitation (Du et al., 2009; Du & Xie, 2017; Lin et al., 2019; Xie et al., 2015). Over the Holocene, however, the zonal shift of the AWJ, its driving mechanisms, and its association with EASM precipitation remain poorly understood.…”

Section: Introductionmentioning

confidence: 99%

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Role of Asian Westerly Jet Core's Zonal Migration in Holocene East Asian Summer Monsoon Precipitation

et al. 2022

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Paleoclimatic records reveal spatially asynchronous changes of East Asian summer monsoon (EASM) precipitation during the Holocene, but the underlying mechanisms are not fully understood. This study explores the role of the zonal shift of the Asian westerly jet (AWJ) core on the spatial‐temporal variability of EASM precipitation based on Holocene climate simulations using the KCM and CESM forced by orbital variations. We analyzed the composite differences of summer precipitation and associated atmospheric circulations between the early (middle) and middle (late) Holocene. Simulations suggest a dipole pattern of summer precipitation with increasing (decreasing) precipitation in central (southern) China from the early to late Holocene, which was shaped by the eastward shift of the AWJ core. The eastward shift of the AWJ core and the accompanied eastward movement of the upper‐level convergence over the AWJ's right exit region weakened the low‐level downward motions over central China. Meanwhile, the low‐level upward motions over southern China were weakened by the concurrent eastward (westward) migration of the South Asian High (western Pacific subtropical High) during the Holocene. Consequently, summer precipitation increased (decreased) in central (southern) China from the early to late Holocene. The eastward shift of the AWJ core was primarily driven by amplified meridional insolation gradient at middle latitudes via strengthening upper‐level westerly intensity during the Holocene. In addition, land cover difference between East Asia and central Asia caused a greater enhancement of westerlies intensity in East Asia, further modulating the eastward movement of the AWJ core during the Holocene.

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Section: Mechanisms Of the Awj-easm Connection During The Holocenesupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Role of Asian Westerly Jet Core's Zonal Migration in Holocene East Asian Summer Monsoon Precipitation

et al. 2022

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“…Here based on the 200‐hPa zonal wind, the occurrences of the jet core are identified and counted, following methods in previous research (Du et al., 2009; Y. Zhang et al., 2006). This approach serves to quantitatively exhibit the positions of climatic westerly jets and imply the possible relations between SIC changes and westerly jet streams.…”

Section: Methodsmentioning

confidence: 99%

Strengthened Connections Between Arctic Sea Ice and Thermal Conditions Over the Tibetan Plateau in May After the 2000s

Hu,

Zhang,

Chen

et al. 2023

JGR Atmospheres

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The thermal conditions of the Tibetan Plateau (TP) during spring are significantly related to climate changes on regional and hemispheric scales. The surface skin temperature over the TP in May exhibits an increasing trend over the northern and central‐western regions since the 2000s. This heterogeneous distribution has a strengthened relationship with changes in Arctic sea‐ice concentration (SIC) over the Barents‐Kara Seas after 2001, showing a significant negative correlation. Along with the dramatic SIC variations after 2001, there is a mid‐latitude wave train akin to the Circumglobal Teleconnection (CGT), accompanied by an anomalous anticyclone around the TP. On the one hand, the high‐latitude energy associated with the SIC changes spreads through the Barents‐Kara Seas toward the southeast, causing intensified westerly winds over the West Siberian Plain. The anomalies imply a poleward subtropical jet, which affects the anticyclonic anomaly over the TP, situated south of the jet axis, through dynamic processes. On the other hand, the cyclonic anomalies at high latitudes, linked with reduced SIC, inhibit snow melting and bring lower soil moisture content. Consequently, increased meridional temperature gradients and background baroclinicity cover the West Siberian Plain and regions encompassing the Black Sea and the Mediterranean, demonstrating the impacts of SIC variations on mid‐latitude Rossby waves. Responses to the anomalous anticyclone over the TP, heightened downward motions favor enhanced adiabatic heating and result in reduced cloud cover, further causing decreased snow depth. Influenced by snow‐albedo and cloud‐radiation feedback, the net downward short‐wave radiation increases and leads to the TP warming after 2001.

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“…Many studies have highlighted the various atmospheric circulation systems affecting summer rainfall over East Asia, such as the South Asian high (SAH) (Liu et al, 2013; Ning et al, 2017; Wei et al, 2015; Zhang & Wu, 2001), western Pacific subtropical high (WPSH) (Li et al, 2016; Matsumura et al, 2015), high‐ and low‐level jet streams (Du et al, 2009; Du et al, 2022; Zhou et al, 2022), Philippine Sea anticyclone (Wang et al, 2000a; Wang & Zhang, 2002), and East Asian monsoon (EAM) (Ding & Chan, 2005; Li et al, 2019; Wang et al, 2005; Zhao & Zhou, 2009). These three‐dimensional atmospheric internal factors are coupled with external forcings, in particular the El Niño‐Southern Oscillation (ENSO), which is known to exert an evident influence on precipitation over SC (Hu et al, 2005; Wu et al, 2003; Zhang et al, 2016; Zheng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Improving seasonal prediction of summer rainfall over southern China using the BCC_CSM1.1m model‐circulation increment‐based dynamic statistical technique

Zhou,

Han,

Zhang

et al. 2023

Meteorological Applications

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A model‐circulation increment‐based dynamic statistical technique (MIDST) is proposed in this paper to improve the prediction of summer rainfall over southern China (SC) where quite low prediction skills have been found in the Beijing Climate Center Climate System Model version 1.1 with a moderate resolution (BCC_CSM1.1m). The results show that BCC_CSM1.1m can hardly represent the variability of the summer rainfall anomaly and its year‐to‐year increment over SC, and the skillful predictions are mostly confined over the middle reaches of the Yangtze River. Using the dynamic model output and statistical method, the MIDST is established to capture the coupled modes between the year‐to‐year increments of the summer rainfall anomaly and the associated simultaneous three‐dimensional coupled air‐sea circulation predictors. The cross‐validation indicates that the prediction skills of the MIDST are evidently improved for both the summer rainfall increment prediction and summer rainfall anomaly prediction compared with the direct BCC_CSM1.1m prediction. The skillful prediction can persist for long forecast leads over most regions except southwestern China. As the major predictability source of seasonal prediction, the intense response to changes in the circulation related to the El Niño‐Southern Oscillation (ENSO) is well captured, and thus, the performance improvement of the MIDST is primarily due to its more realistic representation of the incremental circulation related to the ENSO.

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Analysis of the FGOALS Simulation on East Asian Westerly Jet in CMIP5 during the Meiyu Season

Cited by 3 publications

References 15 publications

Role of Asian Westerly Jet Core's Zonal Migration in Holocene East Asian Summer Monsoon Precipitation

Role of Asian Westerly Jet Core's Zonal Migration in Holocene East Asian Summer Monsoon Precipitation

Strengthened Connections Between Arctic Sea Ice and Thermal Conditions Over the Tibetan Plateau in May After the 2000s

Improving seasonal prediction of summer rainfall over southern China using the BCC_CSM1.1m model‐circulation increment‐based dynamic statistical technique

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