Observed impact of the Arctic Oscillation in boreal spring on the Indian Ocean Dipole in the following autumn and possible physical processes

Cheng, Xin; Chen, Shangfeng; Chen, Wen; Hu, Peng

doi:10.1007/s00382-022-06616-3

Cited by 17 publications

(5 citation statements)

References 93 publications

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“…Wu et al (2013) suggested that the winter sea‐ice anomalies west of Greenland have a significant influence on summer rainfall anomalies over EAMH via a spring tripole pattern of SST anomalies in the North Atlantic. In addition, studies have also suggested that Arctic sea ice anomalies and the Arctic Oscillation could significantly influence SST anomalies in the tropical Pacific (Chen et al, 2014, 2020; Cheng et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

Relative importance of global warming, the IPO, and the AMO in surface air temperature and terrestrial precipitation

Xu,

Tao,

Rong

et al. 2024

Intl Journal of Climatology

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The relative importance of oceanic modes to global surface air temperature (SAT) and terrestrial precipitation during 1934–2020 was investigated using a variety of statistical and dynamical system methods. Through singular spectrum analysis, we present the distribution of decadal (10–20‐year), multidecadal (20–50‐year), and secular (>50‐year) variabilities of global SAT and terrestrial precipitation anomalies. Three sea surface temperature modes were identified by singular value decomposition that affect the low‐frequency variabilities of global SAT and terrestrial precipitation anomalies—namely, global warming (GW), the Interdecadal Pacific Oscillation (IPO), and the Atlantic Multidecadal Oscillation (AMO). The relative importance GW, the IPO, and the AMO in SAT and terrestrial precipitation was obtained through a normalized multivariate information flow analysis. Besides a high information flow percentage (60%) from GW to global SAT, especially over the northern Indian Ocean and tropical West Pacific, information flow from the AMO to the northwestern Pacific was also found. In terms of terrestrial precipitation, a large area with a wet trend was found over Eurasia at mid‐to‐high latitudes, and this trend was especially remarkable in the boreal winter half‐year (November–April), as compared with that in the boreal summer half‐year (May–October). By employing artificial neutral networks with a self‐organized map to cluster the key patterns of vertically integrated water vapour flux, we found that the synoptic circulation related to the wet trend is characterized by westerly flow that transports water vapour from the northeastern Atlantic to Eurasia, which is favourable for precipitation there both in the boreal winter and summer half‐year.

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Section: Discussionmentioning

confidence: 99%

Relative importance of global warming, the IPO, and the AMO in surface air temperature and terrestrial precipitation

Xu,

Tao,

Rong

et al. 2024

Intl Journal of Climatology

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“…Thus, it is proposed that the IOD underwent an interdecadal change around the 1980s, significantly impacting the IO climate. The warm (cool) SST anomalies in the western (eastern) region of the Indian Ocean and in autumn after the mid-1980s have been identified as conducive to the development of the Indian Ocean Dipole (IOD) via the Walker circulation (Zhang et al 2022;Cheng et al 2023;Zheng et al 2023). Therefore, we illustrate cross-section of vertical velocity averaged over 10 o S -10 o N over the Indian Ocean during autumn, regressed by the IOD index (Fig.…”

Section: The Possible Mechanism For the Intensified Relationshipmentioning

confidence: 99%

Enhanced Influence of Indian Ocean Dipole on Sri Lanka Rainfall in Recent Decades

Kajakokulan,

Jayawardena,

Attada

2024

Preprint

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The Indian Ocean Dipole (IOD) represents a significant driver of ocean-atmosphere coupled phenomena over the equatorial Indian Ocean (IO), exerting a strong influence on the inter-annual rainfall variability of Sri Lanka. However, the nature of the relationship between the IOD and Sri Lanka rainfall has undergone secular fluctuations over the past decades. Consequently, our study provides an in-depth analysis of the evolving relationship between the IOD and rainfall over the wet zone of Sri Lanka during the IOD peak fall, utilising reanalysis datasets from 1940 to 2020. It has been demonstrated that there is a weak and insignificant correlation between the IOD and rainfall over the wet zone of Sri Lanka during the pre-1980s. On the other hand, a strong and significant correlation was observed during the post-1980s. Furthermore, we found that positive IOD warming was higher in the post-1980s compared to the pre-1980s. This was attributed to strong walker circulation and, as a result, strong moisture convergence and convection over the western IO, which led to an enhanced relationship between rainfall over the wet zone of Sri Lanka and IOD. Thus, this study highlights how ocean-atmosphere changes in the tropical IO have contributed to strengthening the IOD- Sri Lanka rainfall relationship over recent decades and could be valuable for seasonal prediction in Sri Lanka.

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“…These Rossby wave trains change the precipitation patterns in Australia (Cai et al., 2011), as well as Peru and Brazil (Bazo et al., 2013; R. Chan et al., 2008; S. C. Chan et al., 2008). Simultaneously, extratropical variability can impact ENSO and IOD (e.g., Chen et al., 2023; Cheng et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

“…C. Chan et al, 2008). Simultaneously, extratropical variability can impact ENSO and IOD (e.g., Cheng et al, 2023).…”

mentioning

confidence: 99%

Springtime Southern Hemisphere Quasi‐Stationary Planetary Wave Activities Associated With ENSO/IOD

Kim,

Song,

Chun

et al. 2024

JGR Atmospheres

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The tropical climate variabilities, such as Indian Ocean Dipole (IOD) and El Niño Southern Oscillation (ENSO), are accompanied by changes in the tropical deep convection which can influence the atmospheric circulation in the Southern Hemisphere (SH). To investigate each role of IOD and ENSO in the September‐November (SON) circulation, we examine teleconnection patterns associated with IOD and ENSO events using the ERA5 monthly averaged data from 1979 to 2020. Our approach is to calculate the power spectral density (PSD) of the sea level pressure (SLP) and meridional wind and geopotential height at 300 hPa that are decomposed by zonal wave numbers (ZWNs), and to compute their correlations with IOD and ENSO at each latitudinal band. The main results are that IOD (ENSO) is negatively (positively) correlated with PSDs of ZWN2 and ZWN3 (ZWN1) at 300 hPa in the SH middle latitudes. Considering the Rossby wave train, IOD (ENSO) considerably affects the variability of the ZWN3 (ZWN1) pattern, which influences the meridional exchange of momentum. Additionally, the relationship between IOD and ZWN3 has become tighter in recent years, which is not seen in that with ENSO. The IOD and ENSO events also modify the SLP patterns and meridional surface winds, modulating the sea ice extent in the Southern Ocean. During the highly positive 2019 IOD event, the variability of the middle latitudes atmospheric circulation was considerably larger than climatology, suggesting a higher chance of more extreme weather patterns associated with more frequent intense IOD events in the warming climate.

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Observed impact of the Arctic Oscillation in boreal spring on the Indian Ocean Dipole in the following autumn and possible physical processes

Cited by 17 publications

References 93 publications

Relative importance of global warming, the IPO, and the AMO in surface air temperature and terrestrial precipitation

Relative importance of global warming, the IPO, and the AMO in surface air temperature and terrestrial precipitation

Enhanced Influence of Indian Ocean Dipole on Sri Lanka Rainfall in Recent Decades

Springtime Southern Hemisphere Quasi‐Stationary Planetary Wave Activities Associated With ENSO/IOD

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