Advanced Search
Article Contents

Local Meridional Circulation and Deserts

  • This paper investigates the dry climatology of Sahara and Northwest China deserts from the viewpoint of local meridional circulation with Xie and Arkin rainfall dada and NCAR / NCEP reanalysis data. Re sults show that there are very dry centers with annual rainfall less than 50 mm over these two deserts while the rainy seasons are very different. In the south part of Sahara desert center and Northwest China desert, over 70% rainfall takes place in June, July and August (JJA). While in the north part of Sahara, rainfall mainly concentrates in December, January and February (DJF). The local biosphere-radiation mechanism proposed by Charney cannot explain the climatology of such very dry centers. Neither can the monsoon-de sert mechanism proposed by Rodwell and Hoskins do for the strongest descent center is much more north ward than the driest center over Sahara in JJA. From the viewpoint of local meridional circulation, the dry ness climatology of Sahara and Northwest China deserts is investigated and compared. It is shown that in DJF, descent of local meridional circulation dominates the two deserts and very dry climate is unavoidable although the relative wet season is weak over the northern part of Sahara due to Mediterranean climate. While in JJA, there is ascent over the two deserts especially over Northwest China. Such ascent can explain the rainy season in south part of Sahara and Northwest China deserts. However, it is the local meridional circulation that takes strong and dry northerly from higher latitudes. The northerly either takes little mois ture to the centers or prevents deep and strong convection over the centers. Such local meridional circulation leads to the dry climatology over the two deserts.
  • [1] Li Chongyin, Li Guilong, 1997: Evolution of Intraseasonal Oscillation over the Tropical Western Pacific / South China Sea and Its Effect to the Summer Precipitation in Southern China, ADVANCES IN ATMOSPHERIC SCIENCES, 14, 246-254.  doi: 10.1007/s00376-997-0023-z
    [2] HUANG Wenyu, WANG Bin*, LI Lijuan, DONG Li, LIN Pengfei, YU Yongqiang, ZHOU Tianjun, LIU Li, XU Shiming, XIA Kun, PU Ye, WANG Lu, LIU Mimi, SHEN Si, HU Ning, WANG Yong, SUN Wenqi, and DONG Fang, 2014: Variability of Atlantic Meridional Overturning Circulation in FGOALS-g2, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 95-109.  doi: 10.1007/s00376-013-2155-7
    [3] HU Dingzhu, TIAN Wenshou, XIE Fei, SHU Jianchuan, and Sandip DHOMSE, , 2014: Effects of Meridional Sea Surface Temperature Changes on Stratospheric Temperature and Circulation, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 888-900.  doi: 10.1007/s00376-013-3152-6
    [4] Wu Guoxiong, Stefano Tibaldi, 1987: THE EFFECTS OF MECHANICAL FORCING ON THE MEAN MERIDIONAL CIRCULATION AND TRANSFER PROPERTIES OF THE ATMOSPHERE, ADVANCES IN ATMOSPHERIC SCIENCES, 4, 24-42.  doi: 10.1007/BF02656659
    [5] HU Ruijin, LIU Qinyu, WANG Qi, J. Stuart GODFREY, MENG Xiangfeng, 2005: The Shallow Meridional Overturning Circulation in the Northern Indian Ocean and Its Interannual Variability, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 220-229.  doi: 10.1007/BF02918511
    [6] DENG Shumei, CHEN Yuejuan, HUANG Yong, LUO Tao, BI Yun, 2011: Transient Characteristics of Residual Meridional Circulation during Stratospheric Sudden Warming, ADVANCES IN ATMOSPHERIC SCIENCES, 28, 551-563.  doi: 10.1007/s00376-010-0010-7
    [7] Chen Ming, Hong Zhongxiang, Arnaldo Longhetto, Richiardone Renzo, 1996: Sensitivity Study of Nonlocal Turbulence Closure Scheme in Local Circulation, ADVANCES IN ATMOSPHERIC SCIENCES, 13, 147-158.  doi: 10.1007/BF02656858
    [8] Boyin HUANG, ZHU Jiang, YANG Haijun, 2014: Mechanisms of Atlantic Meridional Overturning Circulation (AMOC) Variability in a Coupled Ocean-Atmosphere GCM, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 241-251.  doi: 10.1007/s00376-013-3021-3
    [9] YU Lei, GAO Yongqi, WANG Huijun, Helge DRANGE, 2008: Revisiting Effect of Ocean Diapycnal Mixing on Atlantic Meridional Overturning Circulation Recovery in a Freshwater Perturbation Simulation, ADVANCES IN ATMOSPHERIC SCIENCES, 25, 597-609.  doi: 10.1007/s00376-008-0597-0
    [10] Yuan Zhuojian, Wang Tongmei, He Haiyan, Luo Huibang, Guo Yufu, 2000: A Comparison between Numerical Simulations of Forced Local Hadley (Anti-Hadley) Circulation in East Asian and Indian Monsoon Regions, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 538-554.  doi: 10.1007/s00376-000-0017-6
    [11] ZHOU Libo, ZOU Han, MA Shupo, LI Peng, ZHU Jinhuan, HUO Cuiping, 2011: Vertical Air Mass Exchange Driven by the Local Circulation on the Northern Slope of Mount Everest, ADVANCES IN ATMOSPHERIC SCIENCES, 28, 217-222.  doi: 10.1007/s00376-010-9231-z
    [12] Chineke Theo Chidiezie, Li Weiping, 1999: IAP General Circulation Models: A First Step Towards Developing a Local Area Model for Weather Prediction in Nigeria, ADVANCES IN ATMOSPHERIC SCIENCES, 16, 119-132.  doi: 10.1007/s00376-999-0008-1
    [13] Yiwen LI, Hailong LIU, Pengfei LIN, Eric Chassignet, Zipeng Yu, fanghua wu, 2024: Quantifying the role of the eddy transfer coefficient in simulating the response of the Southern Ocean Meridional Overturning Circulation to enhanced westerlies in a coarse-resolution model, ADVANCES IN ATMOSPHERIC SCIENCES.  doi: 10.1007/s00376-024-3278-8
    [14] WU Shu, WU Lixin, LIU Qinyu, Shang-Ping XIE, 2010: Development Processes of the Tropical Pacific Meridional Mode, ADVANCES IN ATMOSPHERIC SCIENCES, 27, 95-99.  doi: 10.1007/s00376-009-8067-x
    [15] ZOU Han, LI Peng, MA Shupo, ZHOU Libo, ZHU Jinhuan, 2012: The Local Atmosphere and the Turbulent Heat Transfer in the Eastern Himalayas, ADVANCES IN ATMOSPHERIC SCIENCES, 29, 435-440.  doi: 10.1007/s00376-011-0233-2
    [16] ZHU Jieshun, SUN Zhaobo, ZHOU Guangqing, 2007: A Note on the Role of Meridional Wind Stress Anomalies and Heat Flux in ENSO Simulations, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 729-738.  doi: 10.1007/s00376-007-0729-y
    [17] WANG Huijun, 2005: The Circum-Pacific Teleconnection Pattern in Meridional Wind in the High Troposphere, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 463-466.  doi: 10.1007/BF02918759
    [18] He Jinhai, 1990: Discussion of Meridional Propagation Mechanism of Quasi-40-Day Oscillation, ADVANCES IN ATMOSPHERIC SCIENCES, 7, 78-86.  doi: 10.1007/BF02919170
    [19] Zhao Ming, Zeng Xinmin, 2002: A Theoretical Analysis on the Local Climate Change Induced by the Change of Landuse, ADVANCES IN ATMOSPHERIC SCIENCES, 19, 45-63.  doi: 10.1007/s00376-002-0033-9
    [20] Yonghong LIU, Bing DANG, Yongming XU, Fuzhong WENG, 2021: An Observational Study on the Local Climate Effect of the Shangyi Wind Farm in Hebei Province, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 1905-1919.  doi: 10.1007/s00376-021-0290-0

Get Citation+

Export:  

Share Article

Manuscript History

Manuscript received: 10 September 2001
Manuscript revised: 10 September 2001
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Local Meridional Circulation and Deserts

  • 1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

Abstract: This paper investigates the dry climatology of Sahara and Northwest China deserts from the viewpoint of local meridional circulation with Xie and Arkin rainfall dada and NCAR / NCEP reanalysis data. Re sults show that there are very dry centers with annual rainfall less than 50 mm over these two deserts while the rainy seasons are very different. In the south part of Sahara desert center and Northwest China desert, over 70% rainfall takes place in June, July and August (JJA). While in the north part of Sahara, rainfall mainly concentrates in December, January and February (DJF). The local biosphere-radiation mechanism proposed by Charney cannot explain the climatology of such very dry centers. Neither can the monsoon-de sert mechanism proposed by Rodwell and Hoskins do for the strongest descent center is much more north ward than the driest center over Sahara in JJA. From the viewpoint of local meridional circulation, the dry ness climatology of Sahara and Northwest China deserts is investigated and compared. It is shown that in DJF, descent of local meridional circulation dominates the two deserts and very dry climate is unavoidable although the relative wet season is weak over the northern part of Sahara due to Mediterranean climate. While in JJA, there is ascent over the two deserts especially over Northwest China. Such ascent can explain the rainy season in south part of Sahara and Northwest China deserts. However, it is the local meridional circulation that takes strong and dry northerly from higher latitudes. The northerly either takes little mois ture to the centers or prevents deep and strong convection over the centers. Such local meridional circulation leads to the dry climatology over the two deserts.

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return