Has the regional Hadley circulation over western Pacific during boreal winter been strengthening in recent decades?

Huang, Ruping; Chen, Shangfeng; Chen, Wen; Hu, Peng

doi:10.1080/16742834.2018.1507412

Cited by 4 publications

(1 citation statement)

References 35 publications

(81 reference statements)

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“…In the past two decades, with ongoing global warming and the continuous reduction in Arctic sea ice, Arctic amplification has become increasingly prominent (Screen and Simmonds 2010), thus strengthening the relationship between the Arctic and middle to low latitudes. The reduction in Arctic sea ice not only influences local air-sea interactions but also affects the whole Northern Hemisphere climate through complex interactions and feedback processes (Honda et al 2009;Song et al 2012;Kug et al 2015;Wang et al 2015;Wu et al 2017;Zhou 2017;Huang et al 2018;Lin and Li 2018;Xu et al 2019). In this regard, Wu (2018) pointed out that Arctic sea ice may influence the climate of East Asia through the negative feedback mechanism of sea ice and atmospheric circulation.…”

Section: Introductionmentioning

confidence: 99%

Possible impacts of December Laptev sea ice on Indian Ocean Dipole conditions during spring

et al. 2021

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This study investigates the relationship and underlying mechanisms between the Indian Ocean Dipole (IOD) and Arctic sea ice. The results reveal that the preceding December sea ice over the Laptev Sea plays an important role in the formation of positive IOD conditions during April–June (AMJ). In years with positive December Laptev sea ice anomalies, the zonal wavenumber-1 (ZWN1) planetary wave component is stimulated at middle and high latitudes. The high-latitude ZWN1 propagates upward to the stratosphere and downward to the troposphere in December, affects the atmospheric circulation over the North Atlantic, and further leads to a warm sea surface temperature anomaly (SSTA) that persists until the following February. The mid-latitude ZWN1 propagates upward to the stratosphere in January and downward to the troposphere in February, contributing to the positive 200-hPa geopotential height anomaly (GPHA) in the subtropical Atlantic. The ascending anomaly induced by the warm SSTA and the positive 200-hPa GPHA in the subtropical Atlantic in February are favorable for effective Rossby wave source formation and stimulate an atmospheric wave train that forms an anomalous cyclone over the northern Arabian Sea, which contributes to enhanced convection over North India, stimulating an anomalous anticyclone over East India and leading to reduced convection over the northeastern Indian Ocean in March. The reduced convection over the northeastern Indian Ocean may lead to strengthened equatorial easterly winds and further contribute to positive IOD conditions in AMJ. These findings indicate that December Laptev sea ice may contribute to AMJ IOD conditions.

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