DOI: 10.1175/JCLI-D-15-0224.1
Scopus记录号: 2-s2.0-84964912726
论文题名: Daily states of the March-April east Pacific ITCZ in three decades of high-resolution satellite data
作者: Haffke C. ; Magnusdottir G. ; Henke D. ; Smyth P. ; Peings Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 8 起始页码: 2981
结束页码: 2995
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate change
; Heat convection
; Nickel
; Oceanography
; Precipitation (meteorology)
; Surface waters
; Geographic location
; Interannual variability
; Intertropical convergence zone
; Intraseasonal variability
; Large scale motion
; Pacific ocean
; Variability
; Clouds
; annual variation
; atmospheric convection
; cloud cover
; intertropical convergence zone
; satellite data
; satellite imagery
; sea surface temperature
; temperature anomaly
; trade wind
; Pacific Ocean
英文摘要: Zonally elongated areas of cloudiness that make up the east Pacific intertropical convergence zone (ITCZ) can take on several configurations in instantaneous observations. A novel statistical model is used to automatically assess the daily state of the east Pacific ITCZ using infrared satellite images from 1980 to 2012. Four ITCZ states are defined based on ITCZ location relative to the equator: north (nITCZ) and south (sITCZ) of the equator, simultaneously north and south of the equator (dITCZ, for double ITCZ), and over the equator (eITCZ). A fifth ITCZ state is used to classify days when no zonally elongated area of cloudiness is present (aITCZ, for absent ITCZ). The ITCZ states can occur throughout the year (except for the eITCZ, which is not present during June-October), with the nITCZ state dominating in terms of frequency of occurrence. Interannual variability of the state distribution is large. The most striking variability in ITCZ states is observed in spring. During March-April, the dITCZ state occurs on average 34% of the time, second only to the nITCZ state (39%). Composites of observed infrared temperature and precipitation by ITCZ state reveal distinct spatial configurations of cloudiness and rainfall. Strong sea surface temperature anomalies are associated only with eITCZ and sITCZ and they correspond to El Niño and La Niña, respectively. However, all five ITCZ states are associated with distinct atmospheric circulation patterns. A connection is found between the ITCZ and the South Pacific convergence zone (SPCZ), such that activity in the SPCZ is enhanced when the ITCZ is absent in the east Pacific. © 2016 American Meteorological Society. 资助项目: NSF, National Science Foundation
; UZH, University of Zurich
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49978
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth System Science, University of California, Irvine, Irvine, CA, United States; Remote Sensing Laboratories, Department of Geography, University of Zurich, Zurich, Switzerland; Department of Computer Science, University of California, Irvine, Irvine, CA, United States
Recommended Citation:
Haffke C.,Magnusdottir G.,Henke D.,et al. Daily states of the March-April east Pacific ITCZ in three decades of high-resolution satellite data[J]. Journal of Climate,2016-01-01,29(8)