Ocean tidal effects on Earth rotation

Gross, R. S.

doi:10.1016/j.jog.2009.09.016

Cited by 20 publications

(17 citation statements)

References 23 publications

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“…Figure 4 shows the LOD spectrum after correcting the SPACE2008 time series for nontidal variability with the GFZ model, and after correcting for tidal variability with (blue line) the IERS model and (red, offset curve) our new model of Table 3. Compared with the residual spectrum shown by Gross [2009], the RAY AND EROFEEVA Figure 5. Excess length of day ΔΛ (ms) over the period January 1962 to July 2009 (modified Julian dates 37,680-55,020).…”

Section: A New Lod Model and Its Assessmentmentioning

confidence: 97%

“…Gross [] performed such tests on the current IERS tide model and also a previously adopted IERS model, as well as some others. He found the current IERS model to be mostly satisfactory although it left a clear residual peak at the period of Mt and possibly MSq.…”

Section: A New Lod Model and Its Assessmentmentioning

confidence: 99%

“…Figure shows the LOD spectrum after correcting the SPACE2008 time series for nontidal variability with the GFZ model, and after correcting for tidal variability with (blue line) the IERS model and (red, offset curve) our new model of Table . Compared with the residual spectrum shown by Gross [], the spectrum here, owing to the GFZ model, has much lower background energy, and it more clearly highlights residual tide problems. In the blue curve, residual peaks are now clearly evident at Mf and MSq frequencies and especially at the Mt frequency.…”

Section: A New Lod Model and Its Assessmentmentioning

confidence: 99%

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Long-period tidal variations in the length of day

Ray

Erofeeva

2014

J. Geophys. Res. Solid Earth

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A new model of long-period tidal variations in length of day is developed. The model comprises 80 spectral lines with periods between 18.6 years and 4.7 days, and it consistently includes effects of mantle anelasticity and dynamic ocean tides for all lines. The anelastic properties follow Wahr and Bergen; experimental confirmation for their results now exists at the fortnightly period, but there remains uncertainty when extrapolating to the longest periods. The ocean modeling builds on recent work with the fortnightly constituent, which suggests that oceanic tidal angular momentum can be reliably predicted at these periods without data assimilation. This is a critical property when modeling most long-period tides, for which little observational data exist. Dynamic ocean effects are quite pronounced at shortest periods as out-of-phase rotation components become nearly as large as in-phase components. The model is tested against a 20 year time series of space geodetic measurements of length of day. The current international standard model is shown to leave significant residual tidal energy, and the new model is found to mostly eliminate that energy, with especially large variance reduction for constituents Sa, Ssa, Mf, and Mt.

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Section: A New Lod Model and Its Assessmentmentioning

confidence: 97%

Section: A New Lod Model and Its Assessmentmentioning

confidence: 99%

Section: A New Lod Model and Its Assessmentmentioning

confidence: 99%

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Long-period tidal variations in the length of day

Ray

Erofeeva

2014

J. Geophys. Res. Solid Earth

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“…While Markowitz (1955Markowitz ( , 1959 reported observing such periodic variations at the fortnightly and monthly tidal frequencies from observations taken at two photographic zenith tubes, these observations were later thrown into doubt by the error analysis of Fliegel and Hawkins (1967). Today, the high accuracy of the space-geodetic measurement systems allows long-period tidal effects on UT1 and LOD to be unambiguously observed (e.g., Bellanger et al, 2002b;Benjamin et al, 2006;Chao et al, 1995a;Dickman and Nam, 1995;Gross, 2009a;Hefty and Capitaine, 1990;McCarthy and Luzum, 1993;Nam and Dickman, 1990;Ray and Egbert, 2012;Robertson et al, 1994;Schastok et al, 1994;Schuh and Schmitz-Hü bsch, 2000). Today, the high accuracy of the space-geodetic measurement systems allows long-period tidal effects on UT1 and LOD to be unambiguously observed (e.g., Bellanger et al, 2002b;Benjamin et al, 2006;Chao et al, 1995a;Dickman and Nam, 1995;Gross, 2009a;Hefty and Capitaine, 1990;McCarthy and Luzum, 1993;Nam and Dickman, 1990;Ray and Egbert, 2012;Robertson et al, 1994;Schastok et al, 1994;Schuh and Schmitz-Hü bsch, 2000).…”

Section: Tidal Variations and Solid Earth Oceanic And Atmospheric Tmentioning

confidence: 99%

Earth Rotation Variations – Long Period

Gross

2015

Treatise on Geophysics

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“…(1994), Herring (1996), Capitainevd. (2002, Gross (2009)yanında GNSS ve VLBI uydu-uzay jeodezisi teknikleri ölçülerinden kestirimine ilişkin yapılan çalışmalar;…”

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Estimation of High-Frequency Earth Rotation Parameters from the Analysis of IVS-CONT14 Campaignand Comparison with IERS2010 Model

Teke¹,

Öcal²

2017

AKU-J. Sci. Eng.

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Anahtar kelimelerVLBI; Yüksek-frekanslı Yer dönme parametreleri; Okyanus gelgitleri; IVS-CONT14 oturumları ÖzetBu çalışmada, Uluslararası Çok Uzun Baz İnterferometrisi (VLBI) Jeodezi ve Astrometri Servisi (IVS) tarafından 6-21 Mayıs 2014 tarihleri arasında 6 kıtadaki 17 VLBI istasyonunun katılımıyla gerçekleştirilen 15 günlük sürekli VLBI oturumlarından (IVS-CONT14) elde edilen ölçülerin analiz edilmesi ile yüksek-frekanslı Yer dönme parametreleri kestirimi yapılmıştır. Kestirilen Yer dönme parametreleri ile Uluslararası Yer Dönme ve Referans Sistemleri Servisi (IERS) 2010 konvansiyonlarında önerilen, günlük ve yarı-günlük (yüksek-frekanslı) okyanus gel-gitleri kaynaklı Yer dönme değişim modeli (IERS2010 modeli) değerleri, spektral analiz ve tanımlayıcı istatistik yöntemleri ile karşılaştırılmıştır. Ayrıca, IERS2010 okyanus gelgitleri kaynaklı yüksek frekanslı Yer dönme modelindeki başlıca gelgitlerin sinüs ve kosinüs genlikleri kestirilmiş, Yer dönme ekseninin ileri-giden (prograde) ve geri-giden (retrograde) kutup gezinmesi hareketlerine etkileri hem model hem de kestirilen parametreler için fazör gösterimi üzerinden yorumlanmıştır. IERS2010 modelinden hesaplananve IVS-CONT14 ölçülerinden kestirilen yüksek frekanslı Yer dönme parametrelerinin genliklerinin 12 saat periyodunda iyi uyum gösterdiği belirlenmiştir. Estimation of High-Frequency Earth Rotation Parameters from the Analysis of IVS-CONT14 Campaignand Comparison with IERS2010 ModelKeywords VLBI; High-frequency Earth rotation parameters; Ocean tides; IVS-CONT14 sessions . AbstractIn this study, high-frequency Earth rotation parameters were estimated by means of analysing the observations of the 15 days continuous Very Long Baseline Interferometry (VLBI) sessions, participating 17 VLBI stations located at 6 continents (IVS-CONT14), carried out from 6th to 21st of May 2014 by the International VLBI Service for Geodesy and Astrometry (IVS). The estimated Earth rotation parameters were compared to themodel values of the diurnal and semi-diurnal (high-frequency) Earth rotation variations caused by ocean tides (IERS2010 model), recommended by the International Earth Rotation and Reference Systems Service (IERS) 2010 conventions, by means of spectral analysis and descriptive statistics. Moreover, sine and cosine amplitudes of the major tidal terms of the IERS2010 highfrequency Earth rotation model due to the ocean tides were estimated and their effects on prograde and retrograde polar motions of the Earth rotation axis were interpreted upon the phasor plots for both estimated and model values.It is inferred that the amplitudes of high-frequencyEarth rotation parameters with 12 hours period computed from the IERS2010 model and those of estimated from the IVS-CONT14 observations are in a good agreement. © Afyon Kocatepe Üniversitesi

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Ocean tidal effects on Earth rotation

Cited by 20 publications

References 23 publications

Long-period tidal variations in the length of day

Long-period tidal variations in the length of day

Earth Rotation Variations – Long Period

Estimation of High-Frequency Earth Rotation Parameters from the Analysis of IVS-CONT14 Campaignand Comparison with IERS2010 Model

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