IASI:CrIS SNO

1 Root Location

/home/chepplew/projects/sno/iasi_cris/

2 Overview

Some IASI:CrIS SNO data were available from JPL, the remainder are created at ASL.

3 Group Locations:

/asl/s1/chepplew/data/sno/iasi_cris/JPL/
/asl/s1/chepplew/data/sno/iasi_cris/{LR,HR}/ There are two options in the ASL/ directory: Data from CrIS high-resolution mode or CrIS low-resolution mode:

File names will be of the form: sno_iasi_cris_asl_20130116.mat

4 ASL data:

MAT files are supplied with the following fields:

short name	contents	description
---------–—:	:-------------	:---------------
strYr:	'2013'	The date processed.
strMn:	'09'	The date processed.
strDy:	'12'	The date processed.
cris_res:	'LOW'	CrIS spectral resolution
maxDtim:	0.0069	Maximum temporal separation of Obs (in units of day)
maxDphi:	0.0719	Maximum anglular separation of Obs (degrees of great circle)
var	various gelolocation data.	Geolocation data
ri:	[N x 8461 single]	IASI SNO radiances
rc:	[N x 1317 single]	CrIS SNO radiances
fc:	[1317x1 double]	CrIS channel (centre) frequencies.
i2rc:	[N x 1317 single]	IASI converted to CrIS radiances.
fi2c	[1 x 1317 single]	CrIS grid used for i2rc radiances.

5 Production:

step 1: Obtain SNO pairs and geolocation. /home/chepplew/projects/sno/makeSNO/make_IASI_CRIS_sno_frmL1.m and batch processor: =/home/chepplew/projects/sno/makeSNO/batch_IASI_CRIS_SNO_frmL1.m
step 2: Convert IASI to CrIS ILS. /home/chepplew/gitLib/asl_sno/proc_iasi_to_cris_sno_mat.m Accepts a single input number for the year of SNOs to process.
Appends new fields to existing SNO MAT file: i2rc, fi2c.

6 Availability

Code: /home/chepplew/projects/sno/iasi_cris/iasi_cris_sno_availability.m

IASI:CrIS SNO data are avilable in daily MAT files, with variable numbers of SNO pairs per day. A summary of availability for the ASL IASI:CrIS (low-resolution) SNO data is shown in figure.