Subduction of active spreading ridges and the disappearance of Andean-type cordilleras by Scalabrino, Bruno, Lagabrielle, Yves, Faccenna, Claudio

“…At the Antarctica–South America connection, three active ridge subductions induced the disruption of a former continuous cordillera during the opening of Drake Passage. Active ridge subduction induces lithosphere thermal erosion and related crustal extension in the upper plate. …”
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Chaotic oceanic excitation of low-frequency polar motion variability by L. Börger, M. Schindelegger, M. Zhao, R. M. Ponte, A. Löcher, B. Uebbing, J.-M. Molines, T. Penduff

“…More than half of the variance in the intrinsic mass term contribution to <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M4" display="inline" overflow="scroll" dspmath="mathml"><mrow><msup><mover accent="true"><mi mathvariant="italic">χ</mi><mo stretchy="false" mathvariant="normal">^</mo></mover><mi mathvariant="normal">O</mi></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="16pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="b692688346d4fcfacee2f6152b71e819"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="esd-16-75-2025-ie00003.svg" width="16pt" height="15pt" src="esd-16-75-2025-ie00003.png"/></svg:svg></span></span> is associated with a single global mode of random bottom pressure variability, likely generated by nonlinear dynamics in the Drake Passage. Comparisons of observed interannual polar motion excitation against the sum of known surficial mass redistribution effects are sensitive to the representation of intrinsic <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow><msup><mover accent="true"><mi mathvariant="italic">χ</mi><mo stretchy="false" mathvariant="normal">^</mo></mover><mi mathvariant="normal">O</mi></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="16pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="0f3a73f3fbed0a489e998628e7d4569c"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="esd-16-75-2025-ie00004.svg" width="16pt" height="15pt" src="esd-16-75-2025-ie00004.png"/></svg:svg></span></span> signals: reductions in the observed excitation variance can be as high as 68 % or as low as 50 % depending on the choice of the ensemble member. …”
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