The deep-sea storm involves the rapid movement of the water with high suspended particle concentration near the bottom of the deep sea. It can damage or even destroy all obstacles, change the submarine topography, and affect the benthic ecological environment. However, in-situ observational studies of its occurrence and the sedimentary record were few and far between. This paper studies the sediment dispersion process of a deep-sea storm in September 2016 caused by the turbidity current activity and observed in situ by deploying a mooring system on the levee of the Gaoping Submarine Canyon in the northeastern South China Sea. It is shown that the suspended particle concentration in places near the bottom increases rapidly with the increase of the temperature and the decrease of the salinity. It is believed that the sediment dispersion of the deep-sea storm is the main dynamic process for the formation of sedimentary laminae in the submarine canyon.
LIU Zhifei
,
ZHANG Yanwei
,
ZHAO Yulong
. In-situ observations of deep-sea storms[J]. Science & Technology Review, 2020
, 38(18)
: 26
-29
.
DOI: 10.3981/j.issn.1000-7857.2020.18.003
[1] Gardner W D, Sullivan L G. Benthic storms:Temporal variability in a deep-ocean nepheloid layer[J]. Science, 1981, 213(4505):329-331.
[2] Hollister C D, McCave I N. Sedimentation under deepsea storms[J]. Nature, 1984, 309:220-225.
[3] Gross T F, Williams III A J. Characterization of deepsea storms[J]. Marine Geology, 1991, 99(3-4):281-301.
[4] Xu J P, Noble M A, Rosenfeld L K. In-situ measurements of velocity structure within turbidity currents[J]. Geophysical Research Letters, 2004, 31:L09311.
[5] Paull C K, Talling P J, Maier K L, et al. Powerful turbidity currents driven by dense basal layers[J]. Nature Communications, 2018, 9:4114.
[6] Liu Z, Zhao Y, Colin C, et al. Source-to-sink processes of fluvial sediments in the South China Sea[J]. Earth-Science Reviews, 2016, 153:238-273.
[7] 汪品先. 追踪边缘海的生命史:"南海深部计划"的科学目标[J]. 科学通报, 2012, 57(20):1807-1826.
[8] Zhang Y, Liu Z, Zhao Y, et al. Long-term in situ observations on typhoon-triggered turbidity currents in the deep sea[J]. Geology, 2018, 46(8):675-678.
[9] Colin C, Liu Z, Lin A T-S, et al. Exploring paleo-hydrology and its impact on sedimentary dynamic processes in the South China Sea, Report of the Oceanographic Cruise HYDROSED-MD215[R]. Orsay:Université Paris-Saclay, 2018.
