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Annual Reversal of the Equatorial Intermediate Current in the Pacific: Observations and Model Diagnostics

机译：太平洋赤道中间流的年度逆转：观测和模型诊断

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摘要

A large reversal of zonal transport below the thermocline was observed over a period of 6 months in the western Pacific Ocean between 2°S and the equator [from 26.2 Sv (1 Sv = 10~6 m~3 s~(-1)) eastward in October 1999 to 28.6 Sv westward in April 2000]. To document this reversal and assess its origin, an unprecedented collection of ADCP observations of zonal currents (2004-06), together with a realistic OGCM simulation of the tropical Pacific, was analyzed. The results of this study indicate that this reversal is the signature of intense annual variability in the subsurface zonal circulation at the equator, at the level of the Equatorial Intermediate Current (EIC) and the Lower Equatorial Intermediate Current (L-EIC). In this study, the EIC and the L-EIC are both shown to reverse seasonally to eastward currents in boreal spring (and winter for the L-EIC) over a large depth range extending from 300 m to at least 1200 m. The peak-to-peak amplitude of the annual cycle of subthermocline zonal currents at 165°E in the model is ～30 cm s~(-1) at the depth of the EIC, and ～20 cm s~(-1) at the depth of the L-EIC, corresponding to a mass transport change as large as ～100 Sv for the annual cycle of near-equatorial zonal transport integrated between 2°S and 2°N and between 410- and 1340-m depths. Zonal circulations on both sides of the equator (roughly within 2° and 5.5° in latitude) partially compensate for the large transport variability. The main characteristics of the annual variability of middepth modeled currents and subsurface temperature (e.g., zonal and vertical phase velocities, meridional structure) are consistent, in the OGCM simulation, with the presence, beneath the thermocline, of a vertically propagating equatorial Rossby wave forced by the westward-propagating component of the annual equatorial zonal wind stress. Interannual modulation of the annual variability in subthermocline equatorial transport is discussed.
机译：在西太平洋和赤道之间，在6个月的时间里，在6个月的时间里，在热跃层以下区域运输发生了大的逆转[从26.2 Sv（1 Sv = 10〜6 m〜3 s〜（-1）） 1999年10月向东移至28.6 Sv，2000年4月向西移]。为了记录这种逆转并评估其起源，分析了史无前例的ADCP纬向海流观测资料（2004-06年），以及对热带太平洋的现实OGCM模拟。这项研究的结果表明，这种逆转是赤道地下赤道中间流（EIC）和赤道中间流（L-EIC）水平赤道地下纬向环流剧烈年度变化的标志。在这项研究中，EIC和L-EIC都显示出在300 m到至少1200 m的较大深度范围内，北方春季（L-EIC的冬季）季节性反转为东流。该模型在EIC深度处165°E处的亚热线纬向电流年周期的峰-峰值幅度为EIC深度处的〜30 cm s〜（-1），在EIC深度处为〜20 cm s〜（-1）。 L-EIC的深度，对应于在2°S和2°N之间以及410- 1340-m深度之间整合的近赤道纬向带年循环的质量传输，其变化约为〜100 Sv。赤道两侧的纬向环流（纬度大约在2°和5.5°范围内）部分补偿了较大的运输变异性。在OGCM模拟中，中深度模拟电流和地下温度（例如纬向和垂直相速度，子午线结构）的年变化的主要特征是一致的，在热跃线下方存在着垂直传播的赤道Rossby波由年度赤道纬向风应力的向西传播组成。讨论了亚温跃层赤道运输年变化的年际调制。

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  • 来源
    《Journal of Physical Oceanography》 |2010年第5期|915-933|共19页
  • 作者

    Frederic Marin; Elodie Kestenare; Thierry Delcroix; Fabien Durand; Sophie Cravatte; Gerard Eldin; Romain Bourdalle-Badie;

  • 作者单位

    Universite de Toulouse, UPS (OMP-PCA), and IRD, LEGOS, Toulouse, France Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales (LEGOS),UMR 5566 CNES/CNRS/IRD/UPS, 14, Ave. Edouard Belin, 31400 Toulouse, France;

    Universite de Toulouse, UPS (OMP-PCA), and IRD, LEGOS, Toulouse, France;

    Universite de Toulouse, UPS (OMP-PCA), and IRD, LEGOS, Toulouse, France;

    Universite de Toulouse, UPS (OMP-PCA), and IRD, LEGOS, Toulouse, France;

    Universite de Toulouse, UPS (OMP-PCA), and IRD, LEGOS, Toulouse, France;

    Universite de Toulouse, UPS (OMP-PCA), and IRD, LEGOS, Toulouse, France;

    GIP Mercator Ocean, Ramonville St. Agne, and CERFACS, Toulouse, France;

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