globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-15-0894.1
Scopus记录号: 2-s2.0-84993995153
论文题名:
An equatorial-extratropical dipole structure of the Atlantic Niño
作者: Nnamchi H.C.; Li J.; Kucharski F.; Kang I.-S.; Keenlyside N.S.; Chang P.; Farneti R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期:20
起始页码: 7295
结束页码: 7311
语种: 英语
Scopus关键词: Atmospheric temperature ; Atmospheric thermodynamics ; Climate change ; Evaporation ; Evaporative cooling systems ; Fluxes ; Heat flux ; Nickel ; Statistics ; Surface waters ; Atlantic Ocean ; Atmosphere-ocean interactions ; Geographic location ; Interannual variability ; Ocean dynamics ; Statistical techniques ; Variability ; Oceanography ; air-sea interaction ; annual variation ; anticyclone ; extratropical environment ; heat budget ; heat flux ; sea surface temperature ; trade wind ; Angola ; Atlantic Ocean ; Benguela ; Saint Helena
英文摘要: Equatorial Atlantic variability is dominated by the Atlantic Niño peaking during the boreal summer. Studies have shown robust links of the Atlantic Niño to fluctuations of the St. Helena subtropical anticyclone and Benguela Niño events. Furthermore, the occurrence of opposite sea surface temperature (SST) anomalies in the eastern equatorial and southwestern extratropical South Atlantic Ocean (SAO), also peaking in boreal summer, has recently been identified and termed the SAO dipole (SAOD). However, the extent to which and how the Atlantic Niño and SAOD are related remain unclear. Here, an analysis of historical observations reveals the Atlantic Niño as a possible intrinsic equatorial arm of the SAOD. Specifically, the observed sporadic equatorial warming characteristic of the Atlantic Niño (~0.4 K) is consistently linked to southwestern cooling (~-0.4 K) of the Atlantic Ocean during the boreal summer. Heat budget calculations show that the SAOD is largely driven by the surface net heat flux anomalies while ocean dynamics may be of secondary importance. Perturbations of the St. Helena anticyclone appear to be the dominant mechanism triggering the surface heat flux anomalies. A weakening of the anticyclone will tend to weaken the prevailing northeasterlies and enhance evaporative cooling over the southwestern Atlantic Ocean. In the equatorial region, the southeast trade winds weaken, thereby suppressing evaporation and leading to net surface warming. Thus, it is hypothesized that the wind-evaporation-SST feedback may be responsible for the growth of the SAOD events linking southern extratropics and equatorial Atlantic variability via surface net heat flux anomalies. © 2016 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50167
Appears in Collections:气候变化事实与影响

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作者单位: Department of Geography, University of Nigeria, Nsukka, Nigeria; College of Global Change and Earth System Science, Beijing Normal University, Joint Center for Global Change Studies, Beijing, China; Earth System Physics Section, Abdus Salam International Centre for Theoretical Physics, Trieste, Italy; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; Center of Excellence for Climate Change Research, King Abdulaziz University, Jeddah, Saudi Arabia; Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Department of Oceanography, Texas A and M University, College Station, TX, United States; Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China

Recommended Citation:
Nnamchi H.C.,Li J.,Kucharski F.,et al. An equatorial-extratropical dipole structure of the Atlantic Niño[J]. Journal of Climate,2016-01-01,29(20)
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