Turn off MathJax
Article Contents
Shanwu Zhang, Yun Qiu, Hangyu Chen, Junqiang Shen, Junpeng Zhang, Jing Cha, Fuwen Qiu, Chunsheng Jing. Estimate of contribution of near-inertial waves to the velocity shear in the Bay of Bengal based on mooring observations from 2013 to 2014[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1743-0
Citation: Shanwu Zhang, Yun Qiu, Hangyu Chen, Junqiang Shen, Junpeng Zhang, Jing Cha, Fuwen Qiu, Chunsheng Jing. Estimate of contribution of near-inertial waves to the velocity shear in the Bay of Bengal based on mooring observations from 2013 to 2014[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1743-0

Estimate of contribution of near-inertial waves to the velocity shear in the Bay of Bengal based on mooring observations from 2013 to 2014

doi: 10.1007/s13131-021-1743-0
Funds:  National Key Research and Development Program of China under contract No. 2016YFC1401403; State Oceanic Administration (SOA) Program on Global Change and Air-Sea Interactions under contract No. GASI-IPOVAI-02; Indian Ocean Ninety-east Ridge Ecosystem and Marine Environment Monitoring and Protection, Supported by the China Ocean Mineral Resources R & D Association under contract No. DY135-E2-4; Scientific Research Foundation of Third Institute of Oceanography, SOA under contract Nos 2018001, 2017012 and 2014028.
More Information
  • Corresponding author: E-mail: jingcs@tio.org.cn
  • Received Date: 2020-08-15
  • Accepted Date: 2020-09-12
  • Available Online: 2021-06-18
  • Near-inertial motions contribute most of the velocity shear in the upper ocean. In the Bay of Bengal (BoB), the annual-mean energy flux from the wind to near-inertial motions in the mixed layer in 2013 is dominated by tropical cyclone (TC) processes. However, due to the lack of long-term observations of velocity profiles, our knowledge about interior near-inertial waves (NIWs) as well as their shear features is limited. In this study, we quantified the contribution of NIWs to shear by integrating the wavenumber-frequency spectra estimated from velocity profiles in the upper layers (40−440 m) of the southern BoB from April 2013 to May 2014. It is shown that the annual-mean proportion of near-inertial shear out of the total is approximately 50%, and the high contribution is mainly due to the enhancement of the TC processes during which the near-inertial shear accounts for nearly 80% of the total. In the steady monsoon seasons, the near-inertial shear is dominant to or at least comparable with the subinertial shear. The contribution of NIWs to the total shear is lower during the summer monsoon than during the winter monsoon owing to more active mesoscale eddies and higher subinertial shear during the summer monsoon. The Doppler shifting of the M2 internal tide has little effect on the main results since the proportion of shear from the tidal motions is much lower than that from the near-inertial and subinertial motions.
  • loading
  • [1]
    Alford M H. 2003. Improved global maps and 54-year history of wind‐work on ocean inertial motions. Geophysical Research Letters, 30: 1424
    [2]
    Alford M H, Cronin M F, Klymak J M. 2012. Annual cycle and depth penetration of wind-generated near-inertial internal waves at Ocean Station Papa in the northeast Pacific. Journal of Physical Oceanography, 42: 889–909. doi: 10.1175/JPO-D-11-092.1
    [3]
    Alford M H, Gregg M C. 2001. Near-inertial mixing: Modulation of shear, strain and microstructure at low latitude. Journal of Geophysical Research: Oceans, 106: 16947–16968. doi: 10.1029/2000JC000370
    [4]
    Alford M H, MacKinnon J A, Pinkel R, et al. 2017. Space-time scales of shear in the North Pacific. Journal of Physical Oceanography, 47: 2455–2478. doi: 10.1175/JPO-D-17-0087.1
    [5]
    Alford M H, MacKinnon J A, Simmons, H L, et al. 2016. Near-inertial internal gravity waves in the ocean. Annual review of marine science, 8: 95–123. doi: 10.1146/annurev-marine-010814-015746
    [6]
    Breaker L C, Gemmill W H, Dewitt P W, et al. 2003. A curious relationship between the winds and currents at the western entrance of the Santa Barbara Channel. Journal of Geophysical Research, 108: 3132. doi: 10.1029/2002JC001458
    [7]
    Cairns J L, Williams G O. 1976. Internal wave observations from a midwater float. Journal of Geophysical Research, 81: 1943–1950. doi: 10.1029/JC081i012p01943
    [8]
    Cao Anzhou, Guo Zheng, Wang Shuya, et al. 2019. Upper ocean shear in the northern South China Sea. Journal of Oceanography, 75: 525–539. doi: 10.1007/s10872-019-00520-x
    [9]
    Cherian D, Shroyer E, Wijesekera H, et al. 2020. The seasonal cycle of upper-ocean mixing at 8°N in the Bay of Bengal. Journal of Physical Oceanography, 50: 323–342. doi: 10.1175/JPO-D-19-0114.1
    [10]
    Chowdary J S, Parekh A, Ojha S, et al. 2016. Impact of upper ocean processes and air-sea fluxes on seasonal SST biases over the tropical Indian Ocean in the NCEP Climate Forecasting System. International Journal of Climatology, 36: 188–207. doi: 10.1002/joc.4336
    [11]
    Garrett C. 2001. What is the “near-inertial” band and why is it different from the rest of the internal wave spectrum?. Journal of Physical Oceanography, 31: 962–971. doi: 10.1175/1520-0485(2001)031<0962:WITNIB>2.0.CO;2
    [12]
    Garrett C, Munk W. 1975. Space‐time scales of internal waves: A progress report. Journal of Geophysical Research, 80: 291–297. doi: 10.1029/JC080i003p00291
    [13]
    Gao Jing, Wang Jianing, Wang Fan. 2019. Response of near-Inertial shear to wind stress curl and sea level. Scientific Reports, 9: 1–11
    [14]
    Girishkumar M, Suprit K, Chiranjivi J, et al. 2014. Observed oceanic response to tropical cyclone Jal from a moored buoy in the south-western Bay of Bengal. Ocean Dynamics, 64: 325–335. doi: 10.1007/s10236-014-0689-6
    [15]
    Goswami B, Rao S A, Sengupta D, et al. 2016. Monsoons to mixing in the Bay of Bengal: Multiscale air-sea interactions and monsoon predictability. Oceanography, 29: 18–27
    [16]
    Jochum M, Briegleb B P, Danabasoglu G, et al. 2013. The impact of oceanic near-inertial waves on climate. Journal of Climate, 26: 2833–2844. doi: 10.1175/JCLI-D-12-00181.1
    [17]
    Johnston T S, Chaudhuri D, Mathur M, et al. 2016. Decay mechanisms of near-inertial mixed layer oscillations in the Bay of Bengal. Oceanography, 29: 180–191. doi: 10.5670/oceanog.2016.50
    [18]
    Köhler J, Völker G S, Walter M. 2018. Response of the internal wave field to remote wind forcing by tropical cyclones. Journal of Physical Oceanography, 48: 317–328. doi: 10.1175/JPO-D-17-0112.1
    [19]
    Leaman K D, Sanford T B. 1975. Vertical energy propagation of inertial waves: A vector spectral analysis of velocity profiles. Journal of Geophysical Research, 80: 1975–1978. doi: 10.1029/JC080i015p01975
    [20]
    Majumder S, Tandon A, Rudnick D L, et al. 2015. Near inertial kinetic energy budget of the mixed layer and shear evolution in the transition layer in the Arabian Sea during the monsoons. Journal of Geophysical Research: Oceans, 120: 6492–6507. doi: 10.1002/2014JC010198
    [21]
    Pinkel R. 2008. Advection, Phase Distortion, and the Frequency Spectrum of Finescale Fields in the Sea. Journal of Physical Oceanography, 38: 291–313. doi: 10.1175/2007JPO3559.1
    [22]
    Rimac A, von Storch J S, Eden C, et al. 2013. The influence of high‐resolution wind stress field on the power input to near‐inertial motions in the ocean. Geophysical Research Letters, 40: 4882–4886. doi: 10.1002/grl.50929
    [23]
    Saha S, Coauthors. 2014. The NCEP Climate Forecast System Version 2. Journal of Climate, 27: 2185–2208. doi: 10.1175/JCLI-D-12-00823.1
    [24]
    Schott F A, Xie S P, McCreary J P. 2009. Indian Ocean circulation and climate variability. Reviews of Geophysics, 47: RG1002
    [25]
    Varkey M J, Murty V S, Suryanarayana A. 1996. Physical oceanography of the Bay of Bengal and Andaman Sea. Oceanography and Marine Biology, 34: 1–70
  • 加载中

Catalog

    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

    Figures(9)  / Tables(1)

    Article Metrics

    Article views (169) PDF downloads(11) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return