PRELIMINARY STUDIES ON THE IMPACT OF CLIMATE CHANGE ON THE UPWELLING PHENOMENON IN SOUTH CENTRAL VIETNAM WATERS IN SUMMER

Bui Hong Long; Tran Van Chung

doi:10.15625/1859-3097/17/1/9716

Author affiliations

Authors

Bui Hong Long Institute of Oceanography-VAST
Tran Van Chung Institute of Oceanography-VAST

DOI:

https://doi.org/10.15625/1859-3097/17/1/9716

Keywords:

Climate Change, Circulation, Upwelling, HYCOM, NCODA.

Abstract

Recent international studies have demonstrated the decadal variability in the circulation patterns of East Vietnam Sea in the summer with three phases in 1998, 2001 and 2010 respectively. From the analytical results of the sea water level in 20 years, the variation of the water level in the period from 3 - 7 years was considered. Uptrend in regional water levels can be separated into phases 1993-2001, 2007-2010, and the sea water level in the 2002-2005 period remained almost unchanged. Noted that the abnormal increases in the water level in 2001 and 2010 were within the period of La Niña active phase. Obviously, these changes will significantly affect the upwelling of South Central Vietnam. To seek an answer, we have analyzed the data sequence HYCOM + NCODA with 1/12.5⁰ Global Reanalysis. This sequence is quite reliable to assess the scale and the characteristics of ocean eddies with the size of a few tens of kilometers. With this data series, the movement and formation of the eddies can be analyzed, including processes that control the surface mixed layer, the meanders of ocean currents and fronts, the generation and propagation of coastal trapped waves.

Downloads

Download data is not yet available.

Metrics

Metrics Loading ...

References

Wyrtki, K., 1961. Physical oceanography of the Southeast Asian waters. Scripps Institution of Oceanography.

Xu, X. Z., Qiu, Z., and Chen, H. C., 1982. The general descriptions of the horizontal circulation in the South China Sea (Bien Dong Sea). In Proceedings of the 1980 Symposium on Hydrometeorology of the Chinese Society of Oceanology and Limnology, pp. 137-145.

Shaw, P. T., and Chao, S. Y., 1994. Surface circulation in the South China Sea (Bien Dong Sea). Deep Sea Research Part I: Oceanographic Research Papers, 41(11), 1663-1683. DOI: https://doi.org/10.1016/0967-0637(94)90067-1

Chu, P. C., Edmons, N. L., and Fan, C., 1999. Dynamical mechanisms for the South China Sea (Bien Dong Sea) seasonal circulation and thermohaline variabilities. Journal of Physical Oceanography, 29(11), 2971-2989. DOI: https://doi.org/10.1175/1520-0485(1999)029<2971:DMFTSC>2.0.CO;2

Hu, J., Kawamura, H., Hong, H., and Qi, Y., 2000. A review on the currents in the South China Sea: seasonal circulation, South China Sea (Bien Dong Sea) warm current and Kuroshio intrusion. Journal of Oceanography, 56(6), 607-624.

Wang, G., Chen, D., and Su, J., 2006. Generation and life cycle of the dipole in the South China Sea (Bien Dong Sea) summer circulation. Journal of Geophysical Research, 111, C06002. DOI: https://doi.org/10.1029/2005JC003314

Fang, W., Guo, J., Shi, P., and Mao, Q., 2006. Low frequency variability of South China Sea (Bien Dong Sea) surface circulation from 11 years of satellite altimeter data. Geophysical research letters, 33(22). DOI: https://doi.org/10.1029/2006GL027431

Bayler, E. J., and Liu, Z., 2008. Basin‐scale wind‐forced dynamics of the seasonal southern South China Sea (Bien Dong Sea) gyre. Journal of Geophysical Research: Oceans, 113(C7). DOI: https://doi.org/10.1029/2007JC004519

Fang, W., Fang, G., Shi, P., Huang, Q., and Xie, Q., 2002. Seasonal structures of upper layer circulation in the southern South China Sea (Bien Dong Sea) from in situ observations. Journal of Geophysical Research: Oceans, 107(C11). DOI: https://doi.org/10.1029/2002JC001343

Xie, S. P., Chang, C. H., Xie, Q., and Wang, D., 2007. Intraseasonal variability in the summer South China Sea (Bien Dong Sea): Wind jet, cold filament, and recirculations. Journal of Geophysical Research: Oceans, 112(C10). DOI: https://doi.org/10.1029/2007JC004238

Zhuang, W., Xie, S. P., Wang, D., Taguchi, B., Aiki, H., and Sasaki, H., 2010. Intraseasonal variability in sea surface height over the South China Sea (Bien Dong Sea). Journal of Geophysical Research: Oceans, 115(C4). DOI: https://doi.org/10.1029/2009JC005647

Fang, G., Chen, H., Wei, Z., Wang, Y., Wang, X., and Li, C., 2006. Trends and interannual variability of the South China Sea (Bien Dong Sea) surface winds, surface height, and surface temperature in the recent decade. Journal of Geophysical Research: Oceans, 111(C11). DOI: https://doi.org/10.1029/2005JC003276

Xie, S. P., Xie, Q., Wang, D., and Liu, W. T., 2003. Summer upwelling in the South China Sea (Bien Dong Sea) and its role in regional climate variations. Journal of Geophysical Research: Oceans, 108(C8). DOI: https://doi.org/10.1029/2003JC001867

Wang, C., Wang, W., Wang, D., and Wang, Q., 2006. Interannual variability of the South China Sea (Bien Dong Sea) associated with El Niño. Journal of Geophysical Research: Oceans, 111(C3). DOI: https://doi.org/10.1029/2005JC003333

Wang, G., Wang, C., and Huang, R. X., 2010. Interdecadal variability of the eastward current in the South China Sea (Bien Dong Sea) associated with the summer Asian monsoon. Journal of Climate, 23(22), 6115-6123. DOI: https://doi.org/10.1175/2010JCLI3607.1

Chen, G., Hou, Y., Zhang, Q., and Chu, X., 2010. The eddy pair off eastern Vietnam: Interannual variability and impact on thermohaline structure. Continental Shelf Research, 30(7): 715-723. DOI: https://doi.org/10.1016/j.csr.2009.11.013

Chang, C. W., Hsu, H. H., Wu, C. R., and Sheu, W. J., 2008. Interannual mode of sea level in the South China Sea (Bien Dong Sea) and the roles of El Niño and El Niño Modoki. Geophysical Research Letters, 35(3). DOI: https://doi.org/10.1029/2007GL032562

Fang, W., Qiu, F., and Guo, P., 2014. Summer circulation variability in the South China Sea (Bien Dong Sea) during 2006-2010. Journal of Marine Systems, 137, 47-54. DOI: https://doi.org/10.1016/j.jmarsys.2014.04.014

Yaremchuk, M., McCreary Jr, J., Yu, Z., and Furue, R., 2009. The South China Sea (Bien Dong Sea) Throughflow Retrieved from Climatological Data*. Journal of Physical Oceanography, 39(3), 753-767. DOI: https://doi.org/10.1175/2008JPO3955.1

Metzger, E. J., Hurlburt, H. E., Xu, X., Shriver, J. F., Gordon, A. L., Sprintall, J., Susanto, R. D., and van Aken, H. M., 2010. Simulated and observed circulation in the Indonesian Seas: 1/12 global HYCOM and the INSTANT observations. Dynamics of Atmospheres and Oceans, 50(2), 275-300. DOI: https://doi.org/10.1016/j.dynatmoce.2010.04.002

Gao, J., Xue, H., Chai, F., and Shi, M., 2013. Modeling the circulation in the Gulf of Tonkin, South China Sea. Ocean Dynamics, 63(8), 979-993. DOI: https://doi.org/10.1007/s10236-013-0636-y

Xue, Z., Liu, J. P., DeMaster, D., Leithold, E. L., Wan, S., Ge, Q., Ge, Q., Nguyen, V. L., and Ta, T. K. O., 2014. Sedimentary processes on the Mekong subaqueous delta: clay mineral and geochemical analysis. Journal of Asian Earth Sciences, 79, 520-528. DOI: https://doi.org/10.1016/j.jseaes.2012.07.012

Bùi Hồng Long, Trần Văn Chung, 2009. Tính toán dòng chảy trong khu vực nước trồi Nam Trung Bộ bằng mô hình dòng chảy ba chiều (3-D) phi tuyến. Tạp chí Khoa học và Công nghệ biển, 9(2), 1-25.

Bui Hong Long, Tran Van Chung, 2010. Some experimental calculation for 3D currents in the strong upwelling region of southern central Vietnam using finite element method. Proceedings of the International Conference Marine Biodiversity of East Asian Seas: Status, Challenges And Sustainable Development. Nha Trang, Vietnam, 165-177.

Cummings, J. A., and Smedstad, O. M., 2013. Variational data assimilation for the global ocean. In Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications (Vol. II) (pp. 303-343). Springer Berlin Heidelberg. DOI: https://doi.org/10.1007/978-3-642-35088-7_13

Cummings, J. A., 2005. Operational multivariate ocean data assimilation. Quarterly Journal of the Royal Meteorological Society, 131(613), 3583-3604. DOI: https://doi.org/10.1256/qj.05.105

Daley, R., and Barker, E., 2001. NAVDAS: Formulation and diagnostics. Monthly Weather Review, 129(4), 869-883. DOI: https://doi.org/10.1175/1520-0493(2001)129<0869:NFAD>2.0.CO;2

Courtier, P., 1997. Dual formulation of four‐dimensional variational assimilation. Quarterly Journal of the Royal Meteorological Society, 123(544), 2449-2461. DOI: https://doi.org/10.1002/qj.49712354414

Daley, R., and Barker, E., 2001. The NAVDAS source book (p. 163). NRL/PJ/7530-01-441. Naval Research Laboratory, Monterey, California.