id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
488	Add L2-L1 BA extrapolation option to OCC tool	Ian Culverwell	Ian Culverwell	Mi Liao (ROM SAF VS from CMA) had some problems getting ROPP to work with GNOS data, probably because a lot of the L2 profiles from that instrument disappear below about 40 km. She and Sean Healy (ECMWF) solved this by fitting L1-L2 above this height to a simple Zorro function (~ (a^2^-x^2^)^-3/2^) and extrapolating downwards to define an L2 below 40 km.  Prototype code is attached.  We should consider adding this as an option to ROPP.	enhancement	closed	normal	9.1	ropp_pp	9.0	fixed	L2-L1