Observations of Submesoscale Variability and Frontal Subduction within the Mesoscale Eddy Field of the Tasman Sea

被引:33
|
作者
Archer, Matthew [1 ]
Schaeffer, Amandine [1 ]
Keating, Shane [1 ]
Roughan, Moninya [1 ]
Holmes, Ryan [1 ,2 ,3 ]
Siegelman, Lia [4 ]
机构
[1] Univ New South Wales, Sch Math & Stat, Sydney, NSW, Australia
[2] Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia
[3] Univ New South Wales, Ctr Excellence Climate Extremes, Sydney, NSW, Australia
[4] CALTECH, Pasadena, CA 91125 USA
基金
澳大利亚研究理事会;
关键词
Frontogenesis; frontolysis; Instability; Upwelling; downwelling; Eddies; Oceanic mixed layer; In situ oceanic observations; EAST AUSTRALIAN CURRENT; POTENTIAL VORTICITY; COHERENT VORTICES; GRAVITY-WAVES; OCEAN FRONTS; PART I; EDDIES; INSTABILITY; SEPARATION; WATER;
D O I
10.1175/JPO-D-19-0131.1
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Submesoscale lenses of water with anomalous hydrographic properties have previously been observed in the East Australian Current (EAC) system, embedded within the thermocline of mesoscale anticyclonic eddies. The waters within these lenses have high oxygen content and temperature-salinity properties that signify a surface origin. However, it is not known how these lenses form. This study presents field observations that provide insight into a possible generation mechanism via subduction at upper-ocean fronts. High-resolution hydrographic and velocity measurements of submesoscale activity were taken across a front between a mesoscale eddy dipole downstream of the EAC separation point. The front had O(1) Rossby number, strong vertical shear, and flow conducive to symmetric instability. Frontogenesis was measured in conjunction with subduction of an anticyclonic water parcel, indicative of intrathermocline eddy formation. Twenty-five years of satellite imagery reveals the existence of strong mesoscale strain coupled with strong temperature fronts in this region and indicates the conditions that led to frontal subduction observed here are a persistent feature. These processes impact the vertical export of tracers from the surface and dissipation of mesoscale kinetic energy, implicating their importance for understanding regional ocean circulation and biological productivity.
引用
收藏
页码:1509 / 1529
页数:21
相关论文
共 50 条
  • [31] The Linkage of Kuroshio Intrusion and Mesoscale Eddy Variability in the Northern South China Sea: Subsurface Speed Maximum
    Wang, Qiang
    Zeng, Lili
    Chen, Ju
    He, Yunkai
    Zhou, Weidong
    Wang, Dongxiao
    GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
  • [32] Mesoscale Eddy Chain Structures in the Black Sea and Their Interaction with River Plumes: Numerical Modeling and Satellite Observations
    Korotenko, Konstantin
    Osadchiev, Alexander
    Melnikov, Vasiliy
    REMOTE SENSING, 2023, 15 (06)
  • [33] Hindcast of the mesoscale eddy field in the Southeastern Baltic Sea: Model output vs satellite imagery
    Zhurbas, Victor
    Vali, Germo
    Kostianoy, Andrey
    Lavrova, Olga
    RUSSIAN JOURNAL OF EARTH SCIENCES, 2019, 19 (04):
  • [34] Mesoscale eddy variability and its linkage to deep convection over the Bay of Bengal using satellite altimetric observations
    Roman-Stork, Heather L.
    Subrahmanyam, Bulusu
    Trott, Corinne B.
    ADVANCES IN SPACE RESEARCH, 2021, 68 (02) : 378 - 400
  • [35] Seasonal to interannual variability of the eddy field in the Labrador Sea from satellite altimetry
    Brandt, P
    Schott, FA
    Funk, A
    Martins, CS
    JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2004, 109 (C2)
  • [36] Mesoscale variability in the Alboran Sea:: Synthetic aperture radar imaging of frontal eddies -: art. no. 3059
    Font, J
    Rousseau, S
    Shirasago, B
    García-Górriz, E
    Haney, RL
    JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2002, 107 (C6)
  • [37] The Nature of Eddy Kinetic Energy in the Labrador Sea: Different Types of Mesoscale Eddies, Their Temporal Variability, and Impact on Deep Convection
    Rieck, Jan K.
    Boening, Claus W.
    Getzlaff, Klaus
    JOURNAL OF PHYSICAL OCEANOGRAPHY, 2019, 49 (08) : 2075 - 2094
  • [38] Impacts of a Mesoscale Eddy Pair on Internal Solitary Waves in the Northern South China Sea revealed by Mooring Array Observations
    Huang, Xiaodong
    Zhang, Zhiwei
    Zhang, Xiaojiang
    Qian, Hongbao
    Zhao, Wei
    Tian, Jiwei
    JOURNAL OF PHYSICAL OCEANOGRAPHY, 2017, 47 (07) : 1539 - 1554
  • [39] Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path
    L'Hegaret, P.
    Duarte, R.
    Carton, X.
    Vic, C.
    Ciani, D.
    Baraille, R.
    Correard, S.
    OCEAN SCIENCE, 2015, 11 (05) : 667 - 693
  • [40] Within-Field Variability of Bare Soil Evaporation Derived from Eddy Covariance Measurements
    Vanderborght, Jan
    Graf, Alexander
    Steenpass, Christian
    Scharnagl, Benedikt
    Prolingheuer, Nils
    Herbst, Michael
    Franssen, Harrie-Jan Hendricks
    Vereecken, Harry
    VADOSE ZONE JOURNAL, 2010, 9 (04) : 943 - 954