DOI: 10.1016/j.quascirev.2018.05.021
Scopus记录号: 2-s2.0-85048774567
论文题名: Relative influence of precession and obliquity in the early Holocene: Topographic modulation of subtropical seasonality during the Asian summer monsoon
作者: Wu C.-H. ; Lee S.-Y. ; Chiang J.C.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 191 起始页码: 238
结束页码: 255
语种: 英语
英文关键词: Early Holocene Asian summer monsoon
; Obliquity
; Precession
; Seasonality
; Topographic modulation
Scopus关键词: Atmospheric thermodynamics
; Modulation
; Oceanography
; Orbits
; Tropics
; Asian summer monsoons
; Equatorial Indian Ocean
; Meridional circulation
; Obliquity
; Perihelion-precession
; Precession
; Seasonality
; Western North Pacific
; Heating
; atmospheric convection
; Hadley cell
; Holocene
; meridional circulation
; monsoon
; Northern Hemisphere
; obliquity
; paleoclimate
; precession
; seasonality
; subtropical region
; summer
; timescale
; topography
; China
; Himalayas
; Indian Ocean
; Indian Ocean (Equatorial)
; Pacific Ocean
; Pacific Ocean (North)
; Qinghai-Xizang Plateau
; South Asia
; West Africa
英文摘要: On orbital timescales, higher summer insolation is thought to strengthen the continental monsoon while weakening the maritime monsoon in the Northern hemisphere. Through simulations using the Community Earth System Model, we evaluated the relative influence of perihelion precession and high obliquity in the early Holocene during the Asian summer monsoon. The major finding was that precession dominates the atmospheric heating change over the Tibetan Plateau–Himalayas and Maritime Continent, whereas obliquity is responsible for the heating change over the equatorial Indian Ocean. Thus, precession and obliquity can play contrasting roles in driving the monsoons on orbital timescales. In late spring–early summer, interior Asian continental heating drives the South and East Asian monsoons. The broad-scale monsoonal circulation further expands zonally in July–August, corresponding to the development of summer monsoons in West Africa and the subtropical Western North Pacific (WNP) as well as a sizable increase in convection over the equatorial Indian Ocean. Tropical and oceanic heating becomes crucial in late summer. Over South Asia–Indian Ocean (50°E−110°E), the precession maximum intensifies the monsoonal Hadley cell (heating with an inland/highland origin), which is opposite to the meridional circulation change induced by high obliquity (heating with a tropical origin). The existence of the Tibetan Plateau–Himalayas intensifies the precessional impact. During the late-summer phase of the monsoon season, the effect of obliquity on tropical heating can be substantial. In addition to competing with Asian continental heating, obliquity-enhanced heating over the equatorial Indian Ocean also has a Walker-type circulation impact, resulting in suppression of precession-enhanced heating over the Maritime Continent. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112164
Appears in Collections: 气候减缓与适应
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作者单位: Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; Department of Geography and Berkeley Atmospheric Sciences Center, University of California, Berkeley, CA, United Kingdom
Recommended Citation:
Wu C.-H.,Lee S.-Y.,Chiang J.C.H.. Relative influence of precession and obliquity in the early Holocene: Topographic modulation of subtropical seasonality during the Asian summer monsoon[J]. Quaternary Science Reviews,2018-01-01,191