Seasonal global mean sea level change from satellite altimeter, GRACE, and geophysical models |
| |
| Authors: | J L Chen C R Wilson B D Tapley J S Famiglietti Matt Rodell |
| |
| Institution: | (1) Center for Space Research, 3925 W. Braker Lane, Suite 200, Austin, TX 78759-5321, USA;(2) Department of Geological Science, The University of Texas at Austin, 1 University Station C1100, Austin, TX 78712-0254, USA;(3) Department of Earth System Science, University of California, Irvine, CA 92697, USA;(4) Hydrological Sciences Branch, Code 614.3, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA |
| |
| Abstract: | We estimate seasonal global mean sea level changes using different data resources, including sea level anomalies from satellite
radar altimetry, ocean temperature and salinity from the World Ocean Atlas 2001, time-variable gravity observations from the
Gravity Recovery and Climate Experiment (GRACE) mission, and terrestrial water storage and atmospheric water vapor changes
from the NASA global land data assimilation system and National Centers for Environmental Prediction reanalysis atmospheric
model. The results from all estimates are consistent in amplitude and phase at the annual period, in some cases with remarkably
good agreement. The results provide a good measure of average annual variation of water stored within atmospheric, land, and
ocean reservoirs. We examine how varied treatments of degree-2 and degree-1 spherical harmonics from GRACE, laser ranging,
and Earth rotation variations affect GRACE mean sea level change estimates. We also show that correcting the standard equilibrium
ocean pole tide correction for mass conservation is needed when using satellite altimeter data in global mean sea level studies.
These encouraging results indicate that is reasonable to consider estimating longer-term time series of water storage in these
reservoirs, as a way of tracking climate change. |
| |
| Keywords: | Sea level change Global Seasonal GRACE Altimeter Hydrology |
| 本文献已被 SpringerLink 等数据库收录！ |
|
