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contributor authorTian, Zhiping
contributor authorLi, Tim
contributor authorJiang, Dabang
date accessioned2019-09-19T10:08:13Z
date available2019-09-19T10:08:13Z
date copyright12/29/2017 12:00:00 AM
date issued2017
identifier otherjcli-d-16-0744.1.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261948
description abstractAbstractBased on the zonal mass streamfunction, the mid-Holocene annual and seasonal changes in the tropical Pacific Walker circulation (PWC) are examined using numerical simulations from the Paleoclimate Modelling Intercomparison Project Phases 2 and 3. Compared to the preindustrial period, the annual mean of the PWC intensity strengthened (with an average increase of 0.26 ? 1014 kg2 m?2 s?1 or 5%), and both the western edge and center of the PWC cell shifted westward (by an average of 4° and 3°, respectively) in the majority of the 29 models used for analysis during the mid-Holocene. Those changes were closely related to an overall increase in the equatorial Indo-Pacific east?west sea level pressure difference and low-level trade winds over the equatorial Pacific. Annual mean PWC changes come mainly from boreal warm seasons. In response to the mid-Holocene orbital forcing, Asian and North African monsoon rainfall was strengthened due to large-scale surface warming in the Northern Hemisphere in boreal warm seasons, which led to an intensified large-scale thermally direct east?west circulation, resulting in the enhancement and westward shift of the tropical PWC. The opposite occurred during the mid-Holocene boreal cold seasons. Taken together, the change in the monsoon rainfall over the key tropical regions of Asia and North Africa and associated large-scale east?west circulation, rather than the equatorial Pacific SST change pattern, played a key role in affecting the mid-Holocene PWC strength.
publisherAmerican Meteorological Society
titleStrengthening and Westward Shift of the Tropical Pacific Walker Circulation during the Mid-Holocene: PMIP Simulation Results
typeJournal Paper
journal volume31
journal issue6
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-16-0744.1
journal fristpage2283
journal lastpage2298
treeJournal of Climate:;2017:;volume 031:;issue 006
contenttypeFulltext


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