Diurnal atmosphere-ocean signals in Earth's rotation rate and a possible modulation through ENSO

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10366824" target="_blank" >RIV/00216208:11320/17:10366824 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/2017GL072633" target="_blank" >http://dx.doi.org/10.1002/2017GL072633</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2017GL072633" target="_blank" >10.1002/2017GL072633</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Diurnal atmosphere-ocean signals in Earth's rotation rate and a possible modulation through ENSO

Popis výsledku v původním jazyce

Space geodetic determinations of a 6s length-of-day (LOD) anomaly at the diurnal S-1 frequency are reconciled with excitation estimates from geophysical fluid models. Preference is given to a hybrid excitation scheme that combines atmospheric torques with oceanic angular momentum (OAM) terms from hydrodynamic forward modeling. A joint inversion of all data sets yields an LOD in-phase and quadrature estimate of (5.91, -0.22)s, matching space geodetic S-1 terms well within their formal uncertainties. Non-harmonic LOD excitations, while less than 30% of the time-averaged rotation rate contribution, are conclusively linked to El Nino-Southern Oscillation (ENSO) as the main perturbation of diurnal cycle characteristics in the troposphere. ENSO modulations of particular relevance are those in OAM, associated with the barotropic ocean response to regional modifications in the diurnal atmospheric pressure wave. The study thus highlights previously unexplored aspects of non-tidal mass-field variability in the Earth system.

Název v anglickém jazyce

Diurnal atmosphere-ocean signals in Earth's rotation rate and a possible modulation through ENSO

Popis výsledku anglicky

Space geodetic determinations of a 6s length-of-day (LOD) anomaly at the diurnal S-1 frequency are reconciled with excitation estimates from geophysical fluid models. Preference is given to a hybrid excitation scheme that combines atmospheric torques with oceanic angular momentum (OAM) terms from hydrodynamic forward modeling. A joint inversion of all data sets yields an LOD in-phase and quadrature estimate of (5.91, -0.22)s, matching space geodetic S-1 terms well within their formal uncertainties. Non-harmonic LOD excitations, while less than 30% of the time-averaged rotation rate contribution, are conclusively linked to El Nino-Southern Oscillation (ENSO) as the main perturbation of diurnal cycle characteristics in the troposphere. ENSO modulations of particular relevance are those in OAM, associated with the barotropic ocean response to regional modifications in the diurnal atmospheric pressure wave. The study thus highlights previously unexplored aspects of non-tidal mass-field variability in the Earth system.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geophysical Research Letters

ISSN

0094-8276

e-ISSN

—

Svazek periodika

44

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

2755-2762

Kód UT WoS článku

000399762700017

EID výsledku v databázi Scopus

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