How can Greenland lose 269b tons/year and loose only 269km3?

[IvicaPhysics]

The density of ice is 920 kg/m3.
Now let's calculate.
m = 269 000 000 000 000 kg
p = 920 kg/m3
-----------------------------
v=?
V=m/p
V=269 000 000 000 000 kg / 920 kg/m3
V = 292 391 304 347 m3 = 292 391 304.347 km3
v > 269 km3
*NOTE* I made a mistake in the title. I meant to write 269 km3
[Note: Title fixed by moderator]

 

[Asymptotic]

Where did the 269 km3 and 269b tons numbers come from?

Are they tons (as in 2000 pounds), long tons (2240 pounds) or metric tons (2204.6 pounds)?
Glacier ice density varies with depth http://www.iceandclimate.nbi.ku.dk/research/flowofice/densification/
Temperature affects density. https://en.wikipedia.org/wiki/Ice_Ih

 

[DrClaude]

V = 292 391 304 347 m3 = 292 391 304.347 km3

There's your problem. If 1 km = 1000 m, then 1 km³ = (1000 m)³ = 1 000 000 000 m³.

 

[CWatters]

It would be interesting to know the source of the original two numbers. For example was the mass calculated from the volume anyway or was the mass measured independently by gravitational survey?

 

[Drakkith]

V = 292 391 304 347 m3 = 292 391 304.347 km3
v > 269 km3

As DrClaude said, 1 km³ = (1,000m)³=1,000³m³=10⁹ m³
or
1m³ = (0.001km)³=0.001³km³=10^-9km³
so
V = 292 391 304 347 m³ x 10^-9km³/m³= 292. 391 km³