SSM/I Update, PoDAG XXIV, 3-4 Nov 2005 Passive Microwave Update Walt Meier PoDAG XXIV 3-4 Nov 2005,...

SSM/I Update, PoDAG XXIV, 3-4 Nov 2005

Passive Microwave Update

Walt MeierPoDAG XXIV

3-4 Nov 2005, Asheville NC


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 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)


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)


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


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


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)


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


SWE Product Update

From http://nsidc.org/data/docs/daac/nsidc0271_ease_grid_swe_climatology/browse/viewer.html


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


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


Sea Ice CDRs/ESMRs


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)


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


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


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


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


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


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


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


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


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


All About Sea Ice

http://nsidc.org/seaice/


Questions?


Backup Slides


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 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


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

SSM/I Update, PoDAG XXIV, 3-4 Nov 2005 Passive Microwave Update Walt Meier PoDAG XXIV 3-4 Nov 2005,...

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