ssm/i update, podag xxiv, 3-4 nov 2005 passive microwave update walt meier podag xxiv 3-4 nov 2005,...
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SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Passive Microwave Update
Walt MeierPoDAG XXIV
3-4 Nov 2005, Asheville NC
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Topics
• Reprocessing of SSM/I, 1987-1999 • New Scatterometry and SWE products• CDRs (ESDRs) for sea ice• Transition to SSMIS?• NISE F13/F15 comparison • All About Sea Ice website
• Goddard NASA Team distribution now via ftp (no more CDs). FTP directories will be reorganized to eliminate CD volume designations in directory structure (consistency with Bootstrap).
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
SSM/I Reprocessing
• Reprocessing progressing slowly– 1989 completed, reviewed by M. Anderson– 1987 now completed
• Progressing much more slowly than planned due to limited Ops resources (human and hardware)– Ops down 2-3 people for part of past year; 3
different ops personnel for SSM/I since March (training time)
– Transitioning to new servers, upgrades, etc. (computer resources often limited)
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Future Plans for Reprocessing
• If servers and personnel remain stable, estimate ~2 weeks/year for TB files
• Resume reprocessing in mid-November• Reprocessing for TBs should be done by
the end of March (if all goes well)• Reprocessing of sea ice concentration and
ancillary fields will take additional time• Once reprocessing finished, all data will
be distributed to public via ftp (no more CDs)
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Scatterometry
• http://nsidc.org/daac/scatterometry/• QuikScat sea ice extent, 1999-2004
– http://nsidc.org/daac/scatterometry/– http://nsidc.org/data/nsidc-0265.html
• From D. Long, BYU – standard product• Interactive viewing tool• Improvements to standard product planned• Links to other scatterometer data (JPL
PO.DAAC, NOAA) for QuikScat, NScat, ERS
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
ScatterometryAntarctic Ice Extent
0
2
4
6
8
10
12
14
16
18
20
Jul-99 Jan-00 Jul-00 Jan-01 Jul-01 Jan-02 Jul-02 Jan-03 Jul-03 Jan-04 Jul-04
Year
Ice
Ext
ent
(sq
-km
)
eggs
slices
NSIDC NT
GSFC NT
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
ScatterometryArctic Ice Extent
0
2
4
6
8
10
12
14
16
18
20
Jul-99 Jan-00 Jul-00 Jan-01 Jul-01 Jan-02 Jul-02 Jan-03 Jul-03 Jan-04 Jul-04
Year
Ice
Ext
ent
(sq
-km
)
eggs
slices
NSIDC NT
GSFC NT
GSFC NT (AREA)
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
EASE-Grid SWE Product Update
• Update for July 2003 – March 2005 released on 20 September 2005– Data now encompasses Nov 1978 – Mar
2005– SMMR-SSM/I SWE augmented by visible
imagery from NH EASE-Grid Weekly Snow Cover and Sea Ice Extent, ver. 3 (from NOAA-NESDIS weekly snow charts)
– http://nsidc.org/data/nsidc-0271.html
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
SWE Product Update
From http://nsidc.org/data/docs/daac/nsidc0271_ease_grid_swe_climatology/browse/viewer.html
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Sea Ice CDRs/ESDRs• Interest in Climate Data Records, CDRs (Earth
Science Data Records, ESDRs, in NASA lingo) for tracking trends, model validations, etc.
• Consistent, long-term data sets– Sea ice has potential for 1978-present– Very useful because of changes seen in the Arctic over
past 25+ years• Abstracts submitted to
– Fall AGU, U21A, Achieving “benchmark” climate data records fro global climate change: “Developing sea ice climate data records for the NPOESS era” – Meier, Fetterer, Stroeve, Cavalieri, Parkinson, Comiso, and Weaver
– AGU Ocean Sciences, OS037, Development and application of ocean climate data records from space: “Towards a satellite-based sea ice climate data record” – Fetterer, Meier, Stroeve, Cavalieri, Parkinson, Comiso, and Weaver
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Sea Ice CDRs/ESDRs
• Sea ice is a good candidate for a CDR • Goddard timeseries for NASA Team and
Bootstrap have good consistency over satellite record– Intersensor calibration, quality control
• Both data sets have known biases and uncertainties
• Potential for improved data sets through data fusion, improved calibrations, additional data sets, etc.– NIC charts?, Hadley?– New Wentz re-calibrated data set? Will need to study
benefits if there’s interest
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Sea Ice CDRs/ESMRs
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Transition to SSMIS
• SSM/I F13 launched in 1995; it is well past planned lifetime– Current primary NSIDC data stream for SSM/I
products (F15 being collected as backup for NISE)
– F13 may be turned off after F17 operational (scheduled launch 1 Dec)?
• SSM/I F15 since 2000; approaching planned 5-year lifespan
• SSMIS needed to span passive microwave record if AMSR-E doesn’t completely bridge gap with CMIS (likely if CMIS gets delayed)
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Transition to SSMIS
• According to FNMOC (J. Haferman), SSMIS has been released and can be acquired via NOAA/NESDIS
• RSS (P. Ashcroft, M. Brewer) has no specific plans for SSMIS yet, but will handle in similar manner to SSM/I
• GHRC (S. Jones) has no plans to work with SSMIS, but data is still new, so this could change
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
NISE F13/F15 Intercomparison
• Near Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow Extent– Run operationally with F13 Data– Now running with F15 Data as backup –
quick transition if F13 dies– F15 archived back to 1/1/2004
• Compare F13 and F15 to determine differences that would occur due to switchover
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Sea Ice Pixels with at least 5% Difference between F15 and F13
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
11/1 11/11 11/21 12/1 12/11 12/21 12/31 1/10 1/20 1/30 2/9 2/19 3/1 3/11 3/21 3/31
Date, 2004-2005
% o
f S
ea
Ic
e P
ixe
ls w
ith
at
lea
st
5%
Dif
fere
nc
e
F15 5%>F13
F15 5%<F13
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
F13-F15 Snow Comparison
0.0
5.0
10.0
15.0
20.0
25.0
11/1 11/11 11/21 12/1 12/11 12/21 12/31 1/10 1/20 1/30 2/9 2/19 3/1 3/11 3/21 3/31
Date, 2004-2005
% o
f T
ota
l S
no
w P
ixe
ls
Snow, F13 only
Snow, F15 only
F13 descending passes, 6:24 amF15 descending passes, 9:24 am
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
1 Nov 2004
Sea Ice
-5% +5%
Snow
Snow, F13 only
Snow, F15 only
Snow, F15 & F13
No snow
F15 - F13
0%
Coast
Ice sheet
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
2 Nov 2004
Sea Ice
-5% +5%
Snow
Snow, F13 only
Snow, F15 only
Snow, F15 & F13
No snow
F15 - F13
0%
Coast
Ice sheet
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
15 Feb 2005
Sea Ice
-5% +5%
Snow
Snow, F13 only
Snow, F15 only
Snow, F15 & F13
No snow
F15 - F13
0%
Coast
Ice sheet
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
31 Mar 2005
Sea Ice
-5% +5%
Snow
Snow, F13 only
Snow, F15 only
Snow, F15 & F13
No snow
F15 - F13
0%
Coast
Ice sheet
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
All About Sea Ice Website
• Released 27 Sep 2005
• Reviewed internally and by outside scientists
• Future revision and expansion planned
http://nsidc.org/seaice/
Abstract submitted to Fall AGU Education session, ED11D Global Geoscience Education and Outreach, IGY and Int’l Years: “What About Sea Ice?—People, Animals, and Climate Change in the Polar Regions: An Online Resource for IPY and Beyond” – Renfrow, Meier, Wolfe, Scott, Leon, and Weaver
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
All About Sea Ice
http://nsidc.org/seaice/
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Questions?
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Backup Slides
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Ops Personnel
• 3 of 5 full-time employees left in summer 2004 (2 moved to USO). Ops only rehired 2 of the positions (+ 2 part-time students)– With training, ops down two positions for
most of 2nd half of 2004
• Two more ops employees left in March and April respectively, so again down two ops personal for the spring of 2005
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
SSM/I Ops Personnel
• Heidi Schumacher left in March 2005• Jonathan Kovarik replaced Heidi• Fran Coloma hired in June 2005,
replaced Jon• Training on SSM/I takes about a
month• ECS training and other
responsibilities also
SSM/I Update, PoDAG XXIV, 3-4 Nov 2005
Hardware/Software Issues
• Timberwolf (old tape system) transitioning to Rosebud (digital)– 4 of 6 Timberwolf tapes used for transitioning– Reading SSM/I data off Timberwolf slowed considerably– Strain on Timberwolf has caused occasional failures –
need to restart processing
• Upgrades on other machines, leading to downtimes and troubleshooting problems caused by transition
• Also, software changes needed to read F8 off of hard disc instead of CD– Minor issue, but took time because of unfamiliarity with
code