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Variation of the Bottom Pressure from GRACE

Student: Veronika Vlasova

Supervisor: Leonid Zotov

Faculty: HSE Tikhonov Moscow Institute of Electronics and Mathematics (MIEM HSE)

Educational Programme: Applied Mathematics and Information Science (Bachelor)

Final Grade: 9

Year of Graduation: 2016

Twin satellites GRACE (Gravity Recovery and Climate Experiment) help to study the anomalies of the mass distribution based on the earth's gravitational field data collected on a monthly basis since 2002 in the form of coefficients of Stokes-time decomposition of the gravitational potential. Currently, GRACE is a single space mission, making it possible to estimate the contribution of nonsteric components in sea-level change. However, to use GRACE data we need some noise filtering. Data of ocean weight and bottom pressure (OBP) is derived from GRACE observation on 10x10 grid as described in Chambers and Boning. Then they used a multichannel singular spectrum analysis (MSSA) to filter the GRACE data and the separation of the main component (PC) with different periods. It is possible to obtain maps of long-period and annual variations of the bottom pressure to identify areas of the greatest change.

Full text (added May 26, 2016)

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