Table 2. The Different Data Sets of Water Vapor Isotopic Composition Retrieved By Satellite Instruments That We Useda


Data Set	Reference	Level	Spatial Coverage or Location	Period	Precision	Footprint	Comparison Methodology

SCIAMACHY	Frankenberg et al. [2009]	total column, mainly sensitive in the boundary layer	global	2003-2005	40permil-100permil, reduced by averaging	120 x 20 km	collocation
TES	Worden et al. [2007]	600 hPa	global	2004-2008	10-15permil, reduced by averaging	5.3 x 8.5 km	collocation, convolution with kernels
ACE	Nassar et al. [2007]	down to 500 hPa	global, but small number of measurements	2003-2008	about 50permil, reduced by averaging	limb measurement	collocation, smoothing
MIPAS	Steinwagner et al. [2010]	down to 300 hPa	global	September 2002-March 2004	about 50permil, reduced by averaging	limb measurement	collocation, convolution 	with kernels

aThe period indicates that used in our analysis, which can be shorter than the total data set.