Zwally's study is in-line with the GRACE data, and loss of land ice mass. "According to the new analysis of satellite data, the Antarctic ice sheet showed a net

Zwally's study is in-line with the GRACE data, and loss of land ice mass. "According to the new analysis of satellite data, the Antarctic ice sheet showed a net gain of 112 billion tons of ice a year from 1992 to 2001. That net gain slowed to 82 billion tons of ice per year between 2003 and 2008." GRACE shows acceleration since 2008. Zwally's study uses data from 1992-2001, 2003-2008. And is in-line with the net-gain slowing down in his data-set.