Details

Autor(en) / Beteiligte

• Fu, Yuning
• Argus, Donald F.
• Freymueller, Jeffrey T.
• Heflin, Michael B.

Titel

Horizontal motion in elastic response to seasonal loading of rain water in the Amazon Basin and monsoon water in Southeast Asia observed by GPS and inferred from GRACE

Ist Teil von

• Geophysical research letters, 2013-12, Vol.40 (23), p.6048-6053

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2013

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• We find seasonal horizontal crustal motions observed by GPS positioning in elastic response to heavy rainfall in the Amazon Basin and to monsoons in Southeast Asia to be consistent with those inferred from Gravity Recovery and Climate Experiment (GRACE) gravity observations of water mass loading. Solid Earth moves toward the Amazon during heavy spring rainfall and toward Southeast Asia during summer monsoons and back away from these areas 6 months later when the water load is minimum. Vertical oscillations observed by GPS and inferred from GRACE are 2 to 3 times larger than horizontal oscillation near the margins of the areas of large mass loading. Some discrepancies between GPS and GRACE are probably caused by local effects that influence GPS measurements, because the GPS sites that show significant discrepancies also do not match nearby GPS sites. However, when the load is short wavelength, the limited spatial resolution of GRACE can cause systematic misfits. Key Points Long‐wavelength hydrological mass variation causes horizontal crustal motion GPS and GRACE can resolve consistent horizontal seasonal loading deformation Discrepancy is caused by local effects and limited GRACE's spatial resolution