关于ITRF96参考架整体旋转性的探讨

NET ROTATION OF THE ITRF96

利用国际地球自转服务IERS发布的国际地球参考架ITRF96的速度场 ,建立了一个基于现代空间大地测量实测结果的全球板块运动模型ITRF96VEL ,该模型与NNR -NUVEL1A模型有着较好的一致性 .利用该模型 ,本文对ITRF96参考架相对无整体旋转参考架是否存在一个整体旋转的问题进行了初步的探讨 ,结果表明ITRF96参考架相对无整体旋转参考架有一个整体旋转 ,旋转角速度为 0 1 61°/Ma ,旋转极指向南纬 50 5° ,东经 65 5°,这与要求ITRF96无整体旋转的定义不相符 ,这个整体旋转将会对国际地球参考架的高精度应用和长期维持 。

A new present day plate motion model ITRF96VEL is determined on the basis of space geodetic data, incorporating the velocity field of the ITRF96 published in 1997 by IERS. The comparison with plate motion model NNR NUVEL1A determined by geologic data shows that the ITRF96VEL is consistent with it. The total angular momentum of all tectonic plates with regards to the ITRF96VEL shows that the ITRF96 rotates in a right handed sense relative to the no net rotation reference frame at 0 161°/Ma about 50 5°S, 65 5°E. This means that ITRF96 is not sufficiently concordant with the definition of the conventional Terrestrial Reference Frame (CTRF). This inconsistency will influence the highly precise application and the long term maintenance of ITRF96 and the long term variation of the Earth Rotation Parameters. [