OOPS it was January 8 2006 (not 05) something really really really telling happened.My pleasure, Pet. But I didn't see any of those indicating that climate causes nutations. More like the reverse. Please point one out if you saw one that did.![]()
For your perusal:
Abstract
Atmospheric motions in the retrograde diurnal (S1) band are of interest to a wide community of researchers in earth dynamics and geodesy, due to their potential contribution to the low-frequency motions of the rotation axis known as nutations. Previous studies of these effects have noted an order-of-magnitude discrepancy between estimates of atmosphere-induced nutation based on the torque and angular momentum approaches. In this note, angular momentum budgets computed from NCEP reanalysis data are examined in order to isolate the reasons for this discrepancy, and associated constraints on the atmospheric response to solar diurnal forcing are considered.
1. Introduction
Nutations refer to the low-frequency motions of the solid earth's rotation axis in inertial space. They are primarily forced by gravitational interaction with the moon and sun, and span a period range from the 26 and 41 ky characterizing the precession and obliquity cycles, respectively, to the first few harmonics of the annual cycle. They are thus distinct from the “wobbles” of the earth's rotation pole, which have a low frequency in the terrestrial frame (e.g., the annual and Chandler wobbles with periods of 12 and 14 months, respectively), but appear as quasi-diurnal motions in inertial space. Nutational motions are observed with a very high precision using space geodetic techniques, currently reaching a measurement accuracy in polar positioning of 1 cm or less at the earth's surface. This high level of precision enables constraints to be placed on the interior structure of the earth, through comparisons between observed nutation and the modeled response of the earth system to astronomical forcing (see Mathews et al. 2002).
In the atmosphere, the solar heating generates a pressure wave at the 1-solar-day frequency (S1) and its seasonally modulated sidebands. This wave creates a torque at the earth–atmosphere interface and so changes the angular momentum of both the atmosphere and solid earth. The retrograde component of this wave has a low frequency in the inertial frame, and consequently it creates a slow motion of the earth's rotation axis, which can be interpreted as atmosphere-generated nutation (Yseboodt et al. 2002, and references therein). In this study, we examine constraints that can be placed on the atmosphere's response to the S1 thermal forcing using considerations from its angular momentum budget and its pressure-, gravitation-, and friction-mediated interactions with the earth.
More on how the atmoshpere is a driver of earth nutations:
AMS Journals Online - Atmospheric Contributions to Earth Nutation: Geodetic Constraints and Limitations of the Torque Approach
Maybe you need to pull your head out of your ass and look?Exactly. I see plenty of examples using nutations to predict future climate parameters, but none predicting nutations from climate. The lack of a mechanism to explain such an association is a problem![]()