Zusammenfassung
Eustasie ist nicht nur unmittelbar abhängig von den Variationen des Eisvolumens während des späten Känozoikums sondern weithin auch von Veränderungen des Paläogeoids. Auch die Aufzeichnungen der ozeanischen Sauerstoffisotopen sind kein direktes Maß für die Veränderlichkeit des Eisvolumens und den eustatischen Meeresspiegelschwankungen, sondern sie sind signifikant von globalen Verformungen des Paläogeoids betroffen. Die Milankovitch-Variablen haben das Irdische Geoid empfindlich beeinflußt. Dieser Effekt wird als Hauptgrund für die Korrelation zwischen Änderungen der orbitalen Geometrie und den Fluktuationen der Sauerstoffisotopen der Tiefseeaufzeichnungen angesehen. Die Auswirkungen der Milankovitch-Variablen auf die Insolation modifizieren daher eher das Klima der Erde während des Pleistozäns als daß sie es steuern.
Abstract
Eustasy is not a direct measur of the glacial volume changes during the Late Cenozoic but largely the effect of paleogeoid changes. Neither are the oceanic oxygen isotope records a direct measure of the glacial volume changes and the glacial eustatic sea level changes, instead they are also to a significant degree influenced by paleogeoid changes over the globe. The Milankovitch variables sensitively affected the Earth's geoid. This effect is considered to be the main reason for the correlation established between orbital geometry changes and the oxygen isotope fluctuations in the deep sea records. The insolation effects of the Milankovitch variables were therefore rather modulating than controlling the Earth's climate during the Pleistocene.
Résumé
L'eustasie n'est pas une mesure directe des changements du volume de glace durant le Cénozoïque supérieur, mais surtout l'effet de changements du paléogéoïde; de même les valeurs isotopiques de l'oxygène océanique ne sont pas une mesure directe des changements du volume des glaces et des changements du niveau eustatique des mers; elles sont à un degré significatif influencées par des changements du géoïde sur tout le globe. Les variables de Milankovitch ont affecté sensiblement le géoïde de la Terre. Cet effet est considéré comme la raison principale pour la corrélation établie entre les changements de la géométrie orbitale et les fluctuations isotopiques de l'oxygène dans les mers profondes. Les effets d'insolation des variables de Milankovitch étaient donc plutôt une modulation qu'un contrôle du climat de la Terre durant le Pléistocène.
Краткое содержание
Эвстазия зависит не т олько непосредствен но от колебаний объема льд а во время позднейшего ка йнозоя, но и от изменен ий палеогеоида. Соотнош ение изотопов кислорода в океане не является пр ямой мерой изменения объема льда и эвстатическог о колебания уровня ок еанов; оно важно только для описания общего прео бразования палеогео ида в целом. Переменные Миланко вича в значительной мере в лияли на земной геоид. Это влияние является основной причиной ко рреляции между измен ениями геометрии орбиты и флюктуации изотопов О2 в глубинных водах. В лияние кривой графика Милан ковича на климат Земли в плей стоцене выражалось в его сглаживании, но не в его регулирова нии.
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Mörner, N.A. Eustasy, paleoglaciation and palaoclimatology. Geol Rundsch 70, 691–702 (1981). https://doi.org/10.1007/BF01822144
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DOI: https://doi.org/10.1007/BF01822144