Revisiting ENSO impacts on the Indian Ocean SST based on a combined linear regression method

Zhang, Lianyi; Du, Yan; Tozuka, Tomoki; Kido, Shoichiro

doi:10.1007/s13131-021-1733-2

Cited by 9 publications

(5 citation statements)

References 91 publications

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“…These regions are known to influence Amazon hydrology (Foley et al 2002; Yoon and Zeng 2010; Barichivich et al 2018). We furthermore find a strong positive association with SSTs in the Indian Ocean, which is probably the result of teleconnections of this region with ENSO (Stuecker et al 2017;Zhang et al 2021). Associations were strongest with SST averaged over the first half of the year-i.e.…”

Section: Resultssupporting

confidence: 51%

Tree-ring oxygen isotopes record a decrease in Amazon dry season rainfall over the past 40 years

et al. 2021

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Extant climate observations suggest the dry season over large parts of the Amazon Basin has become longer and drier over recent decades. However, such possible intensification of the Amazon dry season and its underlying causes are still a matter of debate. Here we used oxygen isotope ratios in tree rings (δ18OTR) from six floodplain trees from the western Amazon to assess changes in past climate. Our analysis shows that δ18OTR of these trees is negatively related to inter-annual variability of precipitation during the dry season over large parts of the Amazon Basin, consistent with a Rayleigh rainout model. Furthermore δ18OTR increases by approximately 2‰ over the last four decades (~ 1970–2014) providing evidence of an Amazon drying trend independent from satellite and in situ rainfall observations. Using a Rayleigh rainout framework, we estimate basin-wide dry season rainfall to have decreased by up to 30%. The δ18OTR record further suggests such drying trend may not be unprecedented over the past 80 years. Analysis of δ18OTR with sea surface temperatures indicates a strong role of a warming Tropical North Atlantic Ocean in driving this long-term increase in δ18OTR and decrease in dry season rainfall.

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Section: Resultssupporting

confidence: 51%

Tree-ring oxygen isotopes record a decrease in Amazon dry season rainfall over the past 40 years

et al. 2021

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“…IOD, featuring an SST contrast along the equatorial Indian Ocean, is another major climate mode that can affect weather and climate over the surrounding regions and even the globe (Saji et al, 1999;Webster et al, 1999). The IOD is tied with the Indian Ocean summer monsoon evolution, featuring a significant seasonal phase lock (Yang et al, 2015;Zhang et al, 2021a). A typical IOD event tends to develop in boreal summer, peak in fall, and rapidly decay during winter.…”

Section: Iod Events Without Significant Enso Iod Characteristicsmentioning

confidence: 99%

Drivers and characteristics of the Indo-western Pacific Ocean capacitor

Chen²,

Xie³

et al. 2022

Front. Clim.

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Coherently coupled ocean-atmosphere variability of the tropical Indo-Pacific Oceans gives rise to the predictability of Asian summer climate. Recent advances in Indo-western Pacific Ocean capacitor (IPOC) theory and the relationship with El Niño-Southern Oscillation (ENSO) are reviewed. The IPOC features tropical Indian Ocean (TIO) warming and an anomalous anticyclonic circulation over the western North Pacific (WNPAAC), the latter driving water vapor transport to East Asia and causing extreme events, e.g., heavy rainfalls from central China to Japan during the boreal summer. IPOC events often occur in post-ENSO summers, but the significant TIO warming could sustain the WNPAAC without a strong El Niño, forced instead by a strong antecedent positive Indian Ocean Dipole (IOD). In latter cases, the Indian Ocean and WNP act as a self-sustaining system, independent of external forcings. El Niño or positive IOD induces the oceanic downwelling Rossby waves and thermocline warming in the southwest TIO, leading to SST warming and a “C-shaped” wind anomaly during winter and early spring. Furthermore, the southwest TIO downwelling Rossby waves reflect as oceanic Kelvin waves on the African coast. In the early summer, the resultant southeast TIO SST warming induces a second “C-shaped” wind anomaly. Both southwest and southeast TIO warming contribute to the WNPAAC. The WNPAAC modulates the water vapor pathways to East Asia in the late spring and summer, which mostly converge over the South China Sea and adjacent regions before flowing further to the north. More water vapor is transported from the western Pacific warm pool and less from the southern hemisphere and the Indian Ocean. The enhanced Asian Summer monsoon and moisture content lead to extreme rainfalls in central China and Japan during the boreal summer.

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“…El Niño-Southern Oscillation (ENSO) and IOD are important climate modes affecting the interannual SST variability in the Indian Ocean. ENSO is the dominant mode of interannual variability of global climate, dramatically impacting the global oceans (Cai et al, 2015;McPhaden & Yu, 1999;L. Zhang et al, 2021).…”

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confidence: 99%

Characteristics and Drivers of Marine Heatwaves in the Western Equatorial Indian Ocean

Zhang

et al. 2022

JGR Oceans

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In recent years, anthropogenic global warming has caused more frequent and more intense extreme weather and climate events (e.g., temperature extremes, heavy precipitation, and storms) (Seneviratne et al., 2021). Marine heatwave (MHW), a period of anomalously warm sea surface temperature (SST) event (Hobday et al., 2016), has attracted much attention due to its substantial ecological and socioeconomic impacts (

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Revisiting ENSO impacts on the Indian Ocean SST based on a combined linear regression method

Cited by 9 publications

References 91 publications

Tree-ring oxygen isotopes record a decrease in Amazon dry season rainfall over the past 40 years

Tree-ring oxygen isotopes record a decrease in Amazon dry season rainfall over the past 40 years

Drivers and characteristics of the Indo-western Pacific Ocean capacitor

Characteristics and Drivers of Marine Heatwaves in the Western Equatorial Indian Ocean

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