Sea ice extent diagrams are now online. They continue the time series based on SMMR/SSMI data (1979-2002) and on AMSR-E data (2002-Oct 2011)
An unexpected delay in the satellite data delivery causes incomplete or delayed maps. Issue resolvee
An unexpected delay in the satellite data delivery caused incomplete maps. Issue resolved.
7 January 2012
Animations
of the seaice ice cover from SSMIS data are online.
7 November 2011
Processing SSMIS data from previous months to get some overlap period between AMSR-E-based and SSMIS-based
sea ice maps. Sept/Oct 2011 completed.
3 November 2011
Provisional daily production of regional sea
ice maps from SSMIS data up and running.
26 October 2011
Provisional daily production of sea
ice maps from SSMIS data up and running.
5 October 2011
As of 4 October 2011, the AMSR-E instrument has stopped producing data. NASA and JAXA are assessing
the situation. Therefore the sea ice maps could not be updated
since 4 October. We are working on switching to SSMIS data
September 2011
The sea ice pages are currently being tidied up and slightly
restructured. Any
comments/suggestions welcome
October 10-13 2009:
No new calculations since Oct. 9 because of server problems.
Problem fixed, calculations resumed. Oct 12 data up to date.
June 19, 2008:
We now calculate daily maps of combined MODIS - AMSR-E data:
- maps of MODIS RGB composites with AMSR-E ice contour lines
- maps of snow grain size calculated from MODIS data with AMSR-E ice contour lines
- maps of soot concentration calculated from MODIS data with AMSR-E ice contour lines
- more details.
April 22, 2008
A warm Thank You to all users which gave their user feedback in
the months of March and April 2008.
You can find the presentation built from the collected feedback
here
More feedback is aways welcome, please send it to
Georg Heygster
The Polar View network allows to improve our service step by step:
- Faster delivery:
- Maps of today are now availabe around
1700 UTC (new service).
- Maps of yesterday are now available around 0400
(before: around 0700) UTC
Note that these times are just approximate. They may vary subject to
internet traffic and available computing resources
- Using two independent servers at NSIDC and JAXA has allowed
to stabilize the flow of input data
(AMSR-E L1A and L1B swath data) considerably.
Dec 14, 2007:
- The problem with AMSR-E since end November 2007 has been solved.
Since Dec. 12 the service has resumed normal operation.
- The daily maps are now available around 0600 MEZ (0500 UTC) of the following day.
Nov. 17-19, 2006:
Message by JAXA:
We are pleased to announce that the schedule of AMSR-E sleep mode shift
for Leonids-meteors Shower has been fixed as follows.
During these periods, observation by AMSR-E will be suspended.
The period of suspension is
from 04:45 Nov. 17 2006 to 16:45 Nov. 19 2006 (UTC)
The period of Data Loss would somewhat differ from the expected period.
Sorry for any inconvenience this may cause and thank you for your
understanding.
July 24, 2006:
No data available since Saturday, July
22 due to server problems at NSIDC data pool.
Problem solved July 25.
August 12-16, 2005:
Problems with our fileserver.
May 9, 2005:
No data available since Sunday, May 6 due
to server problems at NSIDC data pool.
May 2, 2005:
No data available since Sunday, May 1 due
to server problems at NSIDC data pool.
Service resumed May, 3.
Apr. 20, 2005:
A slight error has been detected in the
calibration of the L1A data at Bremen leading to brightness temperatures
and ice concentrations reduced by few percent. Corrected calcultions will
be effective starting April, 20, 2005. Most users will not remark any differences.
Users processing long-time timeseries should contact Georg Heygster (heygster@uni-bremen.de)
for reprocessing.
Feb. 14, 2005:
No data available since Sunday, Feb. 13
due to server problems at NSIDC data pool.
Jan. 17, 2005:
No data available since Jan. 14 due to server
problems at NSIDC data pool.
Problem at NSICD solved on tue, Jan. 18 (monday holiday).
Jan. 10, 2005:
No data available from Jan. 8 to Jan. 10
due to server problems at NSIDC data pool.
Nov. 19, 2004:
message from NSIDC:
The acquisition of observation data is suspended between
18:27 Nov. 18 2004 and 10:27 Nov. 20 2004 (UTC) according to AMSR-E sleep
mode shift for Leonids-meteors Shower.
Nov. 15, 2004:
AMSR-E, GLAS, MODIS, and NISE data will be unavailable
for ordering from 13 November (8:00 a.m.) to 15 November (7:00 a.m.), U.S.
Mountain Standard Time, due to system maintenance at NSIDC.
Nov 10, 2004:
JAXA issues anouncement
about temporary 89 GHz A scan problem, indicating that it would take some
months to solve the problem by modify the processing software.
Nov. 9, 2004:
The corrupted A scan data (see news of Nov. 5 below)
have been excluded from the processing of the sea ice data.
Compared to the ice concentrations of Nov. 5 to 8 into
which the corrupted A scan data have entered (together with the correct
B scan data), the ice edge appears no more so fuzzy, and also ice concentrations
below 100% are found again.
Nov. 5, 2004:
On Nov.5, we have been informed by JAXA about the
sensor problem with the email below.
It leads to fuzzy ice edges and ice concentration near
100% in the ice pack.
About one half of the image is based on correct data,
the other half includes the corrupted ones.
The email from JAXA:
Date: Fri, 05 Nov 2004 11:16:56 +0900
From: Keiji Imaoka <........@jaxa.jp>
Subject: Issue on AMSR-E 89GHz A-scan output
Dear AMSR colleagues,
This is to inform that the AMSR-E 89GHz A-scan output (both V and H
channels) turned into the minimum value since 06:02 (UTC) on November
4th, 2004. This issue is now under investigation.
For your reference, this phenomenon began from the AMSR-E granule as
follows.
P1AME041104004MD_P01A0000000 -> L1A product
P1AME041104004MD_P01B0000000 -> L1B product
We will keep you informed.
Sincerely,
Tamotsu Igarashi
Science manager for ADEOS-II and AMSR-E