• Adv. Atmos. Sci.
    Asymmetric Variations in the Tropical Ascending Branches of Hadley Circulations and the Associated Mechanisms and Effects
    Bo SUN*1, 2, 3
    1.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
    2.International Pacific Research Center and Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, HI 96822, USA
    3.Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
    Abstract
    Abstract  This study investigates the variations in the tropical ascending branches (TABs) of Hadley circulations (HCs) during past decades, using a variety of reanalysis datasets. The northern tropical ascending branch (NTAB) and the southern tropical ascending branch (STAB), which are defined as the ascending branches of the Northern Hemisphere HC and Southern Hemisphere HC, respectively, are identified and analyzed regarding their trends and variability. The reanalysis datasets consistently show a persistent increase in STAB during past decades, whereas they show less consistency in NTAB regarding its decadal- to multidecadal variability, which generally features a decreasing trend. These asymmetric trends in STAB and NTAB are attributed to asymmetric trends in the tropical SSTs. The relationship between STAB/NTAB and tropical SSTs is further examined regarding their interannual and decadal- to multidecadal variability. On the interannual time scale, the STAB and NTAB are essentially modulated by the eastern-Pacific type of ENSO, with a strengthened (weakened) STAB (NTAB) under an El Niño condition. On the decadal- to multidecadal time scale, the variability of STAB and NTAB is closely related to the southern tropical SSTs and the meridional asymmetry of global tropical SSTs, respectively. The tropical eastern Pacific SSTs (southern tropical SSTs) dominate the tropical SST--NTAB/STAB relationship on the interannual (decadal- to multidecadal) scale, whereas the NTAB is a passive factor in this relationship. Moreover, a cross-hemispheric relationship between the NTAB/STAB and the HC upper-level meridional winds is revealed.
    Keywords tropical ascending branches      Hadley circulation      asymmetry      SST      trend      variability     
    Corresponding Authors: Bo SUN   
    Just Accepted Date: 30 August 2017  
    Service
    E-mail this article
    E-mail Alert
    RSS
    Articles by authors
    Bo SUN
    Cite this article:   
    Bo SUN. Asymmetric Variations in the Tropical Ascending Branches of Hadley Circulations and the Associated Mechanisms and Effects[J]. Adv. Atmos. Sci., 30 August 2017. [Epub ahead of print] doi: 10.1007/s00376-017-7089-z.
    URL:  
    http://159.226.119.58/aas/EN/10.1007/s00376-017-7089-z     OR     
    http://159.226.119.58/aas/EN/Y0/V/I/598
    Related
    [1] Ya GAO,Huijun WANG,Dong CHEN. Interdecadal Variations of the South Asian Summer Monsoon Circulation Variability and the Associated Sea Surface Temperatures on Interannual Scales[J]. Adv. Atmos. Sci., 2017, 34(7): 816 -832 .
    [2] Bo SUN,Huijun WANG. A Trend towards a Stable Warm and Windless State of the Surface Weather Conditions in Northern and Northeastern China during 1961-2014[J]. Adv. Atmos. Sci., 2017, 34(6): 713 -726 .
    [3] Yitian QIAN,Pang-Chi HSU,Chi-Han CHENG. Changes in Surface Energy Partitioning in China over the Past Three Decades[J]. Adv. Atmos. Sci., 2017, 34(5): 635 -649 .
    [4] Feng ZHANG,Yadong LEI,Jia-Ren YAN,Jian-Qi ZHAO,Jiangnan LI,Qiudan DAI. A New Parameterization of Canopy Radiative Transfer for Land Surface Radiation Models[J]. Adv. Atmos. Sci., 2017, 34(5): 613 -622 .
    [5] Kaiqing YANG,Dabang JIANG. Interannual Climate Variability Change during the Medieval Climate Anomaly and Little Ice Age in PMIP3 Last Millennium Simulations[J]. Adv. Atmos. Sci., 2017, 34(4): 497 -508 .
    [6] Jianhuang QIN,Ruiqiang DING,Zhiwei WU,Jianping LI,Sen ZHAO. Relationships between the Extratropical ENSO Precursor and Leading Modes of Atmospheric Variability in the Southern Hemisphere[J]. Adv. Atmos. Sci., 2017, 34(3): 360 -370 .
    [7] Ping LIANG,Yihui DING. The Long-term Variation of Extreme Heavy Precipitation and Its Link to Urbanization Effects in Shanghai during 1916-2014[J]. Adv. Atmos. Sci., 2017, 34(3): 321 -334 .
    [8] Bin WANG,Juan LI,Qiong HE. Variable and Robust East Asian Monsoon Rainfall Response to El Niño over the Past 60 Years (1957-2016)[J]. Adv. Atmos. Sci., 2017, 34(10): 1235 -1248 .
    [9] Ronghui HUANG,Yong LIU,Zhencai DU,Jilong CHEN,Jingliang HUANGFU. Differences and Links between the East Asian and South Asian Summer Monsoon Systems: Characteristics and Variability[J]. Adv. Atmos. Sci., 2017, 34(10): 1204 -1218 .
    [10] Tingting HAN,Huijun WANG,Jianqi SUN. Strengthened Relationship between the Antarctic Oscillation and ENSO After the Mid-1990s during Austral Spring[J]. Adv. Atmos. Sci., 2017, 34(1): 54 -65 .
    [11] Buwen DONG,Rowan T. SUTTON,Wei CHEN,Xiaodong LIU,Riyu LU,Ying SUN. Abrupt Summer Warming and Changes in Temperature Extremes over Northeast Asia Since the Mid-1990s: Drivers and Physical Processes[J]. Adv. Atmos. Sci., 2016, 33(9): 1005 -1023 .
    [12] Xi CAO, Shangfeng CHEN, Guanghua CHEN, Renguang WU. Intensified Impact of Northern Tropical Atlantic SST on Tropical Cyclogenesis Frequency over the Western North Pacific after the Late 1980s[J]. Adv. Atmos. Sci., 2016, 33(8): 919 -930 .
    [13] Igor Oliveira RIBEIRO,Rodrigo Augusto Ferreira de SOUZA,Rita Valèria ANDREOLI,Mary Toshie KAYANO,Patrícia dos Santos COSTA. Spatiotemporal Variability of Methane over the Amazon from Satellite Observations[J]. Adv. Atmos. Sci., 2016, 33(7): 852 -864 .
    [14] Botao ZHOU,Ying SHI,Ying XU. CMIP5 Simulated Change in the Intensity of the Hadley and Walker Circulations from the Perspective of Velocity Potential[J]. Adv. Atmos. Sci., 2016, 33(7): 808 -818 .
    [15] Juan AO,Jianqi SUN. The Impact of Boreal Autumn SST Anomalies over the South Pacific on Boreal Winter Precipitation over East Asia[J]. Adv. Atmos. Sci., 2016, 33(5): 644 -655 .