Intraseasonal Variability of Sea Level in the Western North Pacific

Liu, Haolang; Feng, Xiangbo; Tao, Aifeng; Zhang, Wei

doi:10.1029/2021jc017237

Cited by 4 publications

(4 citation statements)

References 51 publications

(106 reference statements)

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“…rain belt (Yang et al, 2015) may contribute to the pluvial-dominant regime toward Northeast China and the drought-dominant regime shifts toward Southeast China under a warming climate. The location of monsoon rain belt is regulated by many factors, including the Sea Surface Temperature (Liu et al, 2021), the western Pacific subtropical High (WPSH; Hsu et al, 2017;Zhang et al, 2016), the boreal summer intra-seasonal oscillation (Chen et al, 2017), and the El Niño-Southern Oscillation (Hao et al, 2019), which all may affect the shift pattern of SCDP events over Eastern China. and (b) the future period (2069-2098) relative to the baseline period , respectively.…”

Section: Potential Mechanisms Causing Scdp Eventsmentioning

confidence: 99%

Projected Changes in the Pattern of Spatially Compounding Drought and Pluvial Events Over Eastern China Under a Warming Climate

et al. 2023

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The simultaneous occurrence of droughts and floods in neighboring regions amplifies the threats posed by droughts and floods individually. Nonetheless, few studies have been conducted to investigate the simultaneous occurrence of drought and flood events. Here we explore the spatiotemporal characteristics and the shift pattern of droughts and pluvials over Eastern China from a three‐dimensional perspective, using the self‐calibrated Palmer Drought Severity Index and the Climate Research Unit data set as well as four regional climate model simulations. We find that Eastern China experienced droughts and pluvials simultaneously in different locations during boreal summer, and it is projected to simultaneously experience more frequent and more intense droughts and pluvials under a warming climate. Specifically, we investigate the pattern of more pluvials in Southeast China and more droughts in Northeast China for the historical period of 1975–2004. This pattern dynamically evolves under climate warming: the pluvial‐dominated regime shifts from Southeast to Northeast China, while the drought‐dominated regime shifts from Northeast to Southeast China. The weakening strength of the western Pacific subtropical high and a northward displacement of the monsoon rain belt may both contribute to the pattern of more pluvials in Northeast China and more droughts in Southeast China. These findings provide insights into the development of adaptation strategies and emergency response plans for enhancing society's resilience to the spatial co‐occurrence of dry and wet extremes.

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Section: Potential Mechanisms Causing Scdp Eventsmentioning

confidence: 99%

Projected Changes in the Pattern of Spatially Compounding Drought and Pluvial Events Over Eastern China Under a Warming Climate

et al. 2023

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“…This dependency might be complicated due to the interplay between the MJO and ENSO (e.g., Hendon et al, 2007;Liu et al, 2021;Tang & Yu, 2008). For instance, May MJO in the western Pacific leads El Niño conditions in the subsequent December (e.g., Hendon et al, 2007), while ENSO in turn impacts the MJO over the Maritime continent by shifting it south of the equator during eastern Pacific El Niño winters (Liu et al, 2021). To examine this ENSO-MJO-LMC interaction, we first remove the ENSO signal from the LMC.…”

Section: Appendix A: Role Of the Mjo In Affecting Lmc Variabilitymentioning

confidence: 99%

“…When performing the regression with the MJO alone, some 6%-7% of the LMC variance is explained for clusters C 2,3,4 , emphasizing the role of the MJO in setting the LMC patterns. This dependency might be complicated due to the interplay between the MJO and ENSO (e.g., Hendon et al, 2007;Liu et al, 2021;Tang & Yu, 2008). For instance, May MJO in the western Pacific leads El Niño conditions in the subsequent December (e.g., Hendon et al, 2007), while ENSO in turn impacts the MJO over the Maritime continent by shifting it south of the equator during eastern Pacific El Niño winters (Liu et al, 2021).…”

Section: Appendix A: Role Of the Mjo In Affecting Lmc Variabilitymentioning

confidence: 99%

Spatial Patterns of the Tropical Meridional Circulation: Drivers and Teleconnections

et al. 2022

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The Hadley circulation is a key element of the climate system (Hartmann, 1994), responsible for the energy and moisture transport from the equatorial region to the subtropics (e.g., Trenberth & Stepaniak, 2003). The circulation is commonly defined as the zonally averaged meridional circulation in the tropical region (Hartmann, 2016), and is usually calculated as an annual mean or as an average over specific months or seasons.The large longitudinal variations in the different elements involved in the Hadley circulation, such as the strength of the Inter Tropical Convergence Zone (ITCZ) and the location of the subtropical jets that mark the edges of the Hadley circulation, led to the need to calculate the contributions to the Hadley circulation at different longitudes. A method for calculating localized 2-D circulations from the 3-D wind field was first introduced by Keyser et al. (1989). Decomposing the wind field into a rotational and divergent components (Helmholtz decomposition), the longitudinally dependent circulation can be derived from the divergent part of the flow. This method was implemented in several studies for the analysis of the meridional and zonal circulations in specific longitudinal sectors. It was first used to define the horizontal velocity potential and divergent wind in the upper troposphere, in which both the meridional circulation and the zonal circulation are manifested. This definition enabled the investigation of the global monsoon system and its relation to the two circulations on seasonal to decadal time scales (Tanaka et al., 2004;Trenberth et al., 2000). The Helmholtz decomposition was also examined in comparison to a more general 3-D decomposition of global atmospheric circulation (Hu et al., 2017).Motivated by indications that the extent and strength of the Hadley circulation exhibit natural variability (e.g., Simpson, 2018), and might change in the coming century (e.g., Chemke & Polvani, 2019;Grise et al., 2019;Held & Soden, 2006), Helmholtz decomposition was also used to examine the natural variability and decadal change of the longitudinally dependent meridional circulation (LMC) extent, either for specific sectors of the world (Nguyen et al., 2018), or directly as function of longitude (Staten et al., 2019). More recently, Raiter et al. (2020) used the same method, combined with a Lagrangian tracking of air parcels, to examine in detail the mean tropical

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“…Therefore, large-scale ISV in surface circulation during the MISO season is closely associated with variability in wind fields. Small-scale structures are less homogenous in sea level ISV in the WNP and are likely due to the small features of ocean dynamics (e.g., eddies and coastal wind-driven currents) (Liu et al, 2021).…”

Section: Isv Induced By the Misomentioning

confidence: 99%

Intraseasonal Variability of Surface Circulation in the Indo‐Pacific Warm Pool Induced by Summer Monsoon Intraseasonal Oscillations

Song

Wang

et al. 2022

JGR Oceans

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The Indian summer monsoon intraseasonal oscillation (MISO) is the most influential mode of tropical atmospheric intraseasonal variability in boreal summer (May–October). This study investigates how the MISO drives the intraseasonal variability (ISV) of zonal currents (U) in the Indo‐Pacific warm pool (IPWP) region. An analysis of satellite observations confirms a close association between U ISV and the MISO, with MISO‐induced surface U anomalies reaching 16–19 cm s−1 near the equator and 4–5 cm s−1 in the Northern Hemisphere portion of the IPWP. These ISVs account for 15%–35% of the intensity changes in the major zonal currents. The spatial distribution of U ISV shows coherent enhancement and suppression of MISO convections with a lag of approximately 7 days as a delayed response to the tropical wind forcing. ISV anomalies show northward emanation following propagation of the MISO. Ocean model experiments confirm that large‐scale ISV in surface U is primarily caused by the wind forcing of the MISO. Owing to the convergence/divergence of MISO‐induced U ISV, significant warm water volume anomalies occur in the western‐to‐central equatorial Pacific.

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Intraseasonal Variability of Sea Level in the Western North Pacific

Cited by 4 publications

References 51 publications

Projected Changes in the Pattern of Spatially Compounding Drought and Pluvial Events Over Eastern China Under a Warming Climate

Projected Changes in the Pattern of Spatially Compounding Drought and Pluvial Events Over Eastern China Under a Warming Climate

Spatial Patterns of the Tropical Meridional Circulation: Drivers and Teleconnections

Intraseasonal Variability of Surface Circulation in the Indo‐Pacific Warm Pool Induced by Summer Monsoon Intraseasonal Oscillations

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