Effects of Whole SST Anomaly in the Tropical Indian Ocean on Summer rainfall Over Central Asia

Meng, Lixia; Zhao, Yong; Li, Mingang

doi:10.3389/feart.2021.738066

Cited by 11 publications

(7 citation statements)

References 44 publications

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“…As displayed in Figures S1a and S1b in Supporting Information , the August precipitation in China is significantly and positively correlated with the tropical Indian Ocean and North Atlantic SST anomalies in July and August, which was also confirmed in previous studies (Meng et al., 2021; Zhao et al., 2020). In contrast, the SST anomalies related to the July and August sea ice indices are not significant neither in the tropical Indian Ocean and the North Atlantic (Figures S1c and S1d in Supporting Information ), indicating that the sea ice anomaly in the South Indian Ocean cannot affect August precipitation in China through the tropical Indian Ocean and North Atlantic SST.…”

Section: Observation Analysissupporting

confidence: 88%

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Xiao,

Duan,

et al. 2024

JGR Atmospheres

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Through observational analysis and atmospheric simulation experiments, the relationship between sea ice in the region of South Pole and August precipitation in China was determined. Results indicate that the leading mode of August precipitation in China is significantly correlated with July sea ice concentration (SIC) in South Pole, specifically in eastern Indian Ocean (EIO) region. Typically, the SIC growth is followed by positive rainfall anomalies in the middle and lower reaches of Yangtze River Basin (YRB) and Northeast China (NEC), while South China (SC) is under the control of negative rainfall anomalies. Precisely, owing to the temporal persistence of sea ice in the South Polar region from May to August, sea ice anomalies exert a strong influence on August atmospheric stability in EIO of Southern Hemisphere via regulating turbulent heat flux and air temperature anomalies. As SIC increases, the atmospheric circulation in horizontal exhibits the characteristics of the Antarctic Oscillation (AAO) positive phase, affecting the zonal wind anomalies. Subsequently, the anomalous circulation with a barotropic structure propagates to Australia and the East Asian via the strengthened vertical meridional cells and zonal winds. Moreover, numerical simulations confirm that due to the growth of South Polar sea ice in EIO, abnormal cyclone and anticyclone appear over North China and SC respectively, together with the moisture converging anomalies in the middle and lower reaches of YRB, and diverging anomalies in SC. Accordingly, these atmospheric circulation anomalies triggered by Antarctic sea ice conducive to a wet (dry) August in northern (southern) China.

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Section: Observation Analysissupporting

confidence: 88%

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Xiao,

Duan,

et al. 2024

JGR Atmospheres

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“…Previous studies have indicated that in recent decades, CAP has been dominated by interannual variation and is closely related to the first mode of Indian Ocean SST change, referred to as the IOBM (Meng et al., 2021; Y. Wei et al., 2023). However, the relationship between these two factors is unstable and exhibits significant interdecadal variations.…”

Section: Resultsmentioning

confidence: 99%

“…Reduced summer South Asian precipitation following the El Nino–Southern Oscillation (ENSO) can stimulate an anomalous west‐central Asian high, affecting precipitation in the region (Ding & Wang, 2005). Additionally, the Indian Ocean Basin Mode (IOBM), which is well‐recognized as the primary mode of SST interannual variability in the tropical Indian Ocean, can also affect summer precipitation in CA by altering water vapor transport (Meng et al., 2021; Y. Wei et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

The Interdecadal Weakening of the Relationship Between Indian Ocean Sea Surface Temperature and Summer Precipitation in Central Asia

Wei,

2024

Geophysical Research Letters

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The close relationship between the Indian Ocean Basin mode (IOBM) and summer precipitation in Central Asia (CA) has been documented in several studies. Nonetheless, this relationship has weakened since the 1990s and varies with the Atlantic Multi‐decadal Oscillation (AMO) phase transition. During the cold phase of the AMO (1970–1998), precipitation in CA was significantly positively correlated with the IOBM. Conversely, during the warm phase of the AMO (1999–2019), this correlation became insignificant. The decrease in the interannual variation in the IOBM resulted in the weakening of the atmospheric heat source variation over the North Indian continent and the south‐north movement of the subtropical westerly jet (SWJ). Along with the southerly SWJ, the IOBM exhibited only a weak positive correlation with precipitation in southern CA after the 1990s. This remarkable contrast in the impact of IOBM during different phases of the AMO offers intriguing possibilities for improving climate prediction in CA.

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“…Summer precipitation over Central Asia can be modulated by multiple atmospheric circulation systems, such as the South Asia high (Wei et al, 2017), westerly jet (Meng et al, 2021), the East Atlantic‐West Russia pattern (Ma et al, 2020), and North African subtropical high (Lu & Zhao, 2022). The anomalous circulation systems enhance anomalous water vapour transport into Central Asia or form an anomalous cyclone over Central Asia, eventually facilitating summer precipitation there (Chen et al, 2021; Lu & Zhao, 2022; Meng et al, 2021; Xie et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Precursory signals of summer precipitation over southern Central Asia: Combined effect of April soil moisture and sea surface temperature

Wei,

Liu,

Nan

et al. 2024

Intl Journal of Climatology

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This study investigates the interannual variability of summer precipitation over Central Asia and explores its precursory signals through soil moisture (SM) and sea surface temperature (SST) anomalies. The results reveal that southern Central Asia (SCA) is a crucial SM‐precipitation coupling region where summer precipitation is significantly linked to the preceding April SM in the Turan Plain, between the Caspian Sea and the Tibetan Plateau. The preceding Turan Plain SM (TPSM) anomaly can reflect the ensuing summer SM anomalies in the SCA region due to the persistence of SM. The higher TPSM can stimulate anomalous convective ascent and associated negative geopotential height anomalies over the SCA region, which is favourable for more SCA precipitation (SCAP) during summer. Additionally, Indian and Pacific Ocean SST (IPOS) anomalies can regulate the summer SCAP through ocean and land relay effects. The preceding April can reflect the subsequent summer SST anomalies across the northern Indian Ocean and South China Sea, which trigger a Matsuno‐Gill response and induce anomalous water vapour transport into the SCA region, providing favourable moisture conditions for more SCAP during summer. Apart from such an ocean relay effect, the preceding IPOS can modulate the April TPSM first and then affect the summer SCAP through the land relay effect caused by persistent SM anomalies from April to summer. The combined effect of the preceding TPSM and IPOS on the summer SCAP is more pronounced than the respective effect of either TPSM or IPOS. Incorporating the TPSM signal as a supplementary precursor can enhance the predictive skill of summer SCAP. These findings may provide valuable insights into the reasons and prediction of the variability of summer SCAP.

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Effects of Whole SST Anomaly in the Tropical Indian Ocean on Summer rainfall Over Central Asia

Cited by 11 publications

References 44 publications

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

The Interdecadal Weakening of the Relationship Between Indian Ocean Sea Surface Temperature and Summer Precipitation in Central Asia

Precursory signals of summer precipitation over southern Central Asia: Combined effect of April soil moisture and sea surface temperature

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