Changes in intensity of the regional Hadley cell in Indian Ocean and its impacts on surrounding regions

Freitas, Ana Carolina Vasques; Aímola, Luis; Ambrizzi, Tércio; Oliveira, Cristiano Prestrelo de

doi:10.1007/s00703-016-0477-6

Cited by 21 publications

(16 citation statements)

References 40 publications

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“…Feng et al () found that the performance of the CMIP5 model in capturing the interannual variation or the long‐term trend of the annual mean HC is attributed to the model's ability in reproducing the meridional SST gradient. Furthermore, Freitas et al () suggested that the meridional SST gradient explains much of the variability in the intensity of the regional HC over the Indian Ocean during austral winter and spring. Therefore, it is reasonable to speculate that the meridional SST gradient may play an important role in modulating the interannual variation of the WPHCI res .…”

Section: Interannual Variability Of the Wphc Intensity And Its Forcinmentioning

confidence: 99%

“…As land, sea, and topography are not evenly distributed, changes in the HC may be different in various regions (Chen et al, ). Several studies have demonstrated that changes in the regional HC are able to exert great effects on the regional climate variability (e.g., Ambrizzi et al, ; Chen et al, ; Freitas et al, ; Freitas & Ambrizzi, ; Wang, ). For example, Ambrizzi et al () showed that the change in the regional HC over the South American continent has an important influence on precipitation anomalies over the South America.…”

Section: Introductionmentioning

confidence: 99%

“…Freitas and Ambrizzi () showed that changes in the intensity and poleward edge of regional HC over South America could exert pronounced influences on the South American climate anomalies via analyzing observational data and regional climate model. Freitas et al () studied changes in the intensity of the regional HC in the Indian Ocean and its impacts on surrounding regions. Above mentioned studies regarding the regional HC are mainly focused on the long‐term trends.…”

Section: Introductionmentioning

confidence: 99%

“…However, Wang () indicated that since ENSO is characterized as a strong east‐west contrast phenomenon, a global zonally averaged may have shortcomings. In addition, studies have found that connections of ENSO with HC are different over various regions (Freitas et al, ; Freitas & Ambrizzi, ; Zeng et al, ). For instance, Freitas and Ambrizzi () and Freitas et al () reported that intensities of the regional HC over the Indian Ocean and South America are weaker than normal when an El Niño appears.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, studies have found that connections of ENSO with HC are different over various regions (Freitas et al, ; Freitas & Ambrizzi, ; Zeng et al, ). For instance, Freitas and Ambrizzi () and Freitas et al () reported that intensities of the regional HC over the Indian Ocean and South America are weaker than normal when an El Niño appears. By contrast, the regional HC in the eastern Pacific tends to be stronger related to an El Niño event (Wang, ; Zeng et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Interannual Variability of Regional Hadley Circulation Intensity Over Western Pacific During Boreal Winter and Its Climatic Impact Over Asia‐Australia Region

Huang

Chen

et al. 2018

JGR Atmospheres

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This study investigates interannual variability of boreal winter regional Hadley circulation over western Pacific (WPHC) and its climatic impacts. A WPHC intensity index (WPHCI) is defined as the vertical shear of the divergent meridional winds. It shows that WPHCI correlates well with the El Niño–Southern Oscillation (ENSO). To investigate roles of the ENSO‐unrelated part of WPHCI (WPHCIres), variables that are linearly related to the Niño‐3 index have been removed. It reveals that meridional sea surface temperature gradient over the western Pacific plays an essential role in modulating the WPHCIres. The climatic impacts of WPHCIres are further investigated. Below‐normal (above‐normal) precipitation appears over south China (North Australia) when WPHCIres is stronger. This is due to the marked convergence (divergence) anomalies at the upper troposphere, divergence (convergence) at the lower troposphere, and the accompanied downward (upward) motion over south China (North Australia), which suppresses (enhances) precipitation there. In addition, a pronounced increase in surface air temperature (SAT) appears over south and central China when WPHCIres is stronger. A temperature diagnostic analysis suggests that the increase in SAT tendency over central China is primarily due to the warm zonal temperature advection and subsidence‐induced adiabatic heating. In addition, the increase in SAT tendency over south China is primarily contributed by the warm meridional temperature advection. Further analysis shows that the correlation of WPHCIres with the East Asian winter monsoon (EAWM) is weak. Thus, this study may provide additional sources besides EAWM and ENSO to improve understanding of the Asia‐Australia climate variability.

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Section: Interannual Variability Of the Wphc Intensity And Its Forcinmentioning

confidence: 99%