1 / 8

Yavor Chapanov , E-mail: chapanov@clg.bas.bg

Yavor Chapanov , E-mail: chapanov@clg.bas.bg Central Laboratory for Geodes at Bulgarian Academy of Sciences “Acad. G. Bonchev” Str., Bl.1, Sofia 1113, Bulgaria. Daniel Gambis , Е -mail: daniel.gambis@obspm.fr IERS EOP PC , Observatoire de Paris 61,

gable
Download Presentation

Yavor Chapanov , E-mail: chapanov@clg.bas.bg

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Yavor Chapanov, E-mail: chapanov@clg.bas.bg Central Laboratory for Geodes at Bulgarian Academy of Sciences “Acad. G. Bonchev” Str., Bl.1, Sofia 1113, Bulgaria Daniel Gambis, Е-mail: daniel.gambis@obspm.fr IERS EOP PC, Observatoire de Paris 61, Аvenue de l'Observatoire, 75014 Paris, France

  2. BALWOIS 2010 CONFERENCE, 25-29 May 2010, Ohrid, Republic of Macedonia Circular area with radius 4400km. Latitudes between 40 and 50 in the North America and between 50 and 60 in Euro-Asia. Shifted Center by 10 from the North Pole to the Greenland direction. Himalaya ice. South continental ice – major part over Antarctica, minor parts – over South America, New Zeland and Australia. Reconstructed mean sea level for the last 380Kyr by Siddall et al. (2003). LAST GLACIAL MAXIMUM AND SEA LEVEL DATA

  3. BALWOIS 2010 CONFERENCE, 25-29 May 2010, Ohrid, Republic of Macedonia

  4. BALWOIS 2010 CONFERENCE, 25-29 May 2010, Ohrid, Republic of Macedonia Parabolic dependence between the ratio of IIc and IOS and changes of the MSL Coefficient q of ice sheets influence on the moment of inertia LOD / MSL

  5. BALWOIS 2010 CONFERENCE, 25-29 May 2010, Ohrid, Republic of Macedonia Spectra of LOD (thick line) and MSL (thin line) variations for the last 380Kyr - small nonlinear effects LOD VARIATIONS FOR THE LAST 380KA

  6. BALWOIS 2010 CONFERENCE, 25-29 May 2010, Ohrid, Republic of Macedonia UT1 variations, determined by LOD time series integration UT1 periodical part, after excludimg the linear trend UT1 spectrum, dominated by 100Ka and 40Ka periodicities UT1 VARIATIONS FOR THE LAST 380KA

  7. BALWOIS 2010 CONFERENCE, 25-29 May 2010, Ohrid, Republic of Macedonia CONCLUSIONS • The reconstructed glacial variations of the sea level for the last 380Kyr give good opportunity for studying the millennial scale variations of the Earth rotation and to determine long-periodical oscillations of the Length of Day LOD and the Universal Time UT1. Two dimensionless coefficients play a key role for proper determination of the glacial variations of the Earth rotation - transfer coefficient k =10.5 between the homogeneous elastic sphere and the real Earth and variable coefficient q ( 0.02-0.22) of the opposite effects of the ice sheets on the moment of inertia. • The long-periodical LOD and UT1 oscillations are with frequencies closed to some frequencies of the Earth orbital variations, but part of them are outside this frequency bands, so the detailed study of the origin of these oscillations needs to involve more glacial data and to improve the models.

  8. BALWOIS 2010 CONFERENCE, 25-29 May 2010, Ohrid, Republic of Macedonia THANK YOU END

More Related