Impacts of tropical Indian Ocean SST on the meridional displacement of East Asian jet in boreal summer

Qü, Xia; Huang, Gang

doi:10.1002/joc.2378

Cited by 76 publications

(25 citation statements)

References 36 publications

(54 reference statements)

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“…The first leading mode of the interannual Indian Ocean SST variability features a basin‐wide warming or cooling, called as IOBM (Indian Ocean Basin Mode; Yulaeva and Wallace, ; Klein et al ., ; Alexander et al ., ; Chowdary and Gnanaseelan, ; Du et al ., ; Schott et al ., ; Chakravorty et al ., ; Tao et al ., ). When IOBM is in the warming state, warm tropospheric Kelvin wave is triggered, which can contribute to the development of an anomalous anticyclone over the Northwest Pacific (NWP) via the ‘capacitor effect’ (Xie et al ., ), the meridional displacement of the East Asian jet (EAJ) (Qu and Huang, ) and the intensity of the South Asia high (SAH; Huang et al ., ; Qu and Huang, ), and thus affect the East Asian climate, including summer rainfall (Xie et al ., ), typhoon (Du et al ., ), high temperature extremes (Hu et al ., 2011, 2012a, 2012b) and so on.…”

Section: Introductionmentioning

confidence: 86%

Interdecadal modulation of ENSO teleconnections to the Indian Ocean Basin Mode and their relationship under global warming in CMIP5 models

Tao

Huang

et al. 2014

Intl Journal of Climatology

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On the basis of Coupled Model Intercomparison Project phase 5 (CMIP5) models, this study have examined the ability of models to capture the El Niño/Southern Oscillation (ENSO)-Indian Ocean Basin Mode (IOBM) relationship, and investigated the characteristics of interdecadal change of ENSO-IOBM relationship as well as the response of the ENSO-IOBM relationship to the global warming. Among 23 CMIP5 models, the capability of models in representing the IOBM depends largely on the simulation of ENSO. Moreover, half of the models can reproduce the unstable ENSO-IOBM relationship. Considering the simulations of ENSO, ENSO-IOBM relationship and interdecadal change, 6 of 23 CMIP5 models are chosen for further investigation. The interdecadal change of ENSO-IOBM relationship is relative to the three ENSO-related processes. During the high correlation (HC) period, the tropospheric temperature (TT) mechanism, oceanic Rossby waves and antisymmetric wind pattern are strong, prolonging the persistence of IOBM. In comparison, during the low correlation (LC) period, the three processes are weak. The results show that the shallow thermocline in the southwestern Indian Ocean (SWIO), increased interannual variability and prolonged periodicity of ENSO are all responsible for the interdecadal change.Furthermore, the possible changes of ENSO-IOBM relationship in the future are investigated. The ENSO-related tropical Indian Ocean (TIO) warming is strengthened under global warming. Despite the deepened thermocline over SWIO and unchanged ENSO activity, the ENSO-related TIO warming is strengthened by the enhanced TT mechanism, which is caused by the increased saturated specific humidity. The results reveal that there is more downward net heat flux (NHF) over the TIO, which is conducive to the TIO warming, and the latent heat flux (LHF) change makes a great contribution to the NHF change. The weakened upward or strengthened downward LHF is possibly due to the decreased anomalous sea-air temperature difference by strengthened TT mechanism.

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Section: Introductionmentioning

confidence: 86%

Interdecadal modulation of ENSO teleconnections to the Indian Ocean Basin Mode and their relationship under global warming in CMIP5 models

Tao

Huang

et al. 2014

Intl Journal of Climatology

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“…16, when the Indian Ocean SST increases (decreases), positive (negative) westerly anomalies are located over the subtropics, implying a southward (northward) displaced EAJ. Based on observational data, Qu and Huang (2012) also addressed the relationship between the Indian Ocean SST and EAJ, and pointed out one possible mechanism as follows: the anomalously warm SSTs over the Indian Ocean heat the overlying tropospheric air and lead to anomalous convection, which forces a Kelvin wave wedge penetrating into the equatorial western North Pacific . Combined with the climatological easterly shear over the subtropical western North Pacific, the East Asia-Pacific teleconnection is induced along the East Asia coast (Lu, 2004).…”

Section: Changes In East Asia Westerly Jetmentioning

confidence: 99%

Anthropogenic agent implicated as a prime driver of shift in precipitation in eastern China in the late 1970s

Wang

Otterå

et al. 2013

Atmos. Chem. Phys.

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Abstract. Observation shows that eastern China experienced an interdecadal shift in the summer precipitation during the second half of the 20th century. The summer precipitation increased in the middle and lower reaches of the Yangtze River valley, whereas it decreased in northern China. Here we use a coupled ocean-atmosphere general circulation model and multi-ensemble simulations to show that the interdecadal shift is mainly caused by the anthropogenic forcing. The rapidly increasing greenhouse gases induce a notable Indian Ocean warming, causing a westward shift of the western Pacific subtropical high (WPSH) and a southward displacement of the East Asia westerly jet (EAJ) on an interdecadal timescale, leading to more precipitation in Yangtze River valley. At the same time the surface cooling effects from the stronger convection, higher precipitation and rapidly increasing anthropogenic aerosols contribute to a reduced summer land-sea thermal contrast. Due to the changes in the WPSH, the EAJ and the land-sea thermal contrast, the East Asian summer monsoon weakened resulting in drought in northern China. Consequently, an anomalous precipitation pattern started to emerge over eastern China in the late 1970s. According to the model, the natural forcing played an opposite role in regulating the changes in WPSH and EAJ, and postponed the anthropogenically forced climate changes in eastern China. The Indian Ocean sea surface temperature is crucial to the response, and acts as a bridge to link the external forcings and East Asian summer climate together on a decadal and longer timescales. Our results further highlight the dominant roles of anthropogenic forcing agents in shaping interdecadal changes of the East Asian climate during the second half of the 20th century.

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“…The WNPAC corresponds to the westward extension of the western Pacific subtropical high, which tends to intensify the Mei-yu rainband (Chang et al 2000a, b). On the other hand, some studies argue that the maintenance of the WNPAC during El Niño decaying summers relies on remote forcing from the tropical Indian Ocean (TIO) basin-wide warming (Terao and Kubota 2005;Yang et al 2007;Li et al 2008;Xie et al 2009;Wu et al 2009a;Huang et al 2010;Qu and Huang 2011).…”

Section: Introductionmentioning

confidence: 99%

Relationships between ENSO and the East Asian–western North Pacific monsoon: observations versus 18 CMIP5 models

Zhou

2015

Clim Dyn

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Impacts of tropical Indian Ocean SST on the meridional displacement of East Asian jet in boreal summer

Cited by 76 publications

References 36 publications

Interdecadal modulation of ENSO teleconnections to the Indian Ocean Basin Mode and their relationship under global warming in CMIP5 models

Interdecadal modulation of ENSO teleconnections to the Indian Ocean Basin Mode and their relationship under global warming in CMIP5 models

Anthropogenic agent implicated as a prime driver of shift in precipitation in eastern China in the late 1970s

Relationships between ENSO and the East Asian–western North Pacific monsoon: observations versus 18 CMIP5 models

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