Climate-driven Seasonal Geocenter Motion during the GRACE Period

Zhang, H.; Sun, Y.

doi:10.1007/s11600-018-0130-5

Artykuł - szczegóły

Tytuł artykułu

Climate-driven Seasonal Geocenter Motion during the GRACE Period

Autorzy

Zhang H. , Sun Y.

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-018-0130-5

Warianty tytułu

Języki publikacji

Abstrakty

Annual cycles in the geocenter motion time series are primarily driven by mass changes in the Earth’s hydrologic system, which includes land hydrology, atmosphere, and oceans. Seasonal variations of the geocenter motion have been reliably determined according to Sun et al. (J Geophys Res Solid Earth 121(11):8352-8370, 2016) by combining the Gravity Recovery And Climate Experiment (GRACE) data with an ocean model output. In this study, we reconstructed the observed seasonal geocenter motion with geophysical model predictions of mass variations in the polar ice sheets, continental glaciers, terrestrial water storage (TWS), and atmosphere and dynamic ocean (AO). The reconstructed geocenter motion time series is shown to be in close agreement with the solution based on GRACE data supporting with an ocean bottom pressure model. Over 85% of the observed geocenter motion time series, variance can be explained by the reconstructed solution, which allows a further investigation of the driving mechanisms. We then demonstrated that AO component accounts for 54, 62, and 25% of the observed geocenter motion variances in the X, Y, and Z directions, respectively. The TWS component alone explains 42, 32, and 39% of the observed variances. The net mass changes over oceans together with self-attraction and loading effects also contribute significantly (about 30%) to the seasonal geocenter motion in the X and Z directions. Other contributing sources, on the other hand, have marginal (less than 10%) impact on the seasonal variations but introduce a linear trend in the time series.

Słowa kluczowe

mass transportation GRACE degree 1 coefficients geocenter motion

transport zbiorowy GRACE

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2018

Tom

Vol. 66, no. 2

Strony

223--232

Opis fizyczny

Bibliogr. 50 poz.

Twórcy

autor

Zhang H.

Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China
University of Chinese Academy of Sciences, Beijing, China

autor

Sun Y.

jade.yusun@outlook.com

Key Lab of Spatial Data Mining and Information Sharing of Ministry of Education, Fuzhou University, Fuzhou, China
Geoscience and Remote Sensing Department, Delft University of Technology, Delft, The Netherlands

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018)

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-ca622d74-cdcc-4715-9052-4e17b75c4c3d