30 July 2012

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)

16 March 2012

An unexpected delay in the satellite data delivery causes incomplete or delayed maps. Issue resolvee

20-23 February 2012

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:

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:

Dec 14, 2007:

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