PIPS has filled in all the missing dates. The animation below shows the development of the ice pack since January 1.
Disrupting the Borg is expensive and time consuming!
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Yes, it’s good to see it back. Note also that they’ve updated the front page to clarify that it’s a legacy system and is unlikely to be maintained further. The replacement site is much higher resolution, and covers several more variable. It is at:
http://www7320.nrlssc.navy.mil/hycomARC/
http://www7320.nrlssc.navy.mil/hycomARC/arctic.html
Full announcement:
Since late April/early May 2011, PIPS 2.0 has developed an unrealistic opening in the North Pole region. On 22 May 2011, PIPS 2.0 stopped running because of a numerical instability. Since that time, we have been carefully trying to diagnose this problem (checking for anomalous atmospheric forcing, initial fields, boundary conditions, assimilated satellite ice fields, etc). During this process, the system’s ocean model time step was reduced and the system is currently running again. The unobserved opening near the North Pole is still present and can be seen in the ice concentration and ice thickness fields. PLEASE USE THESE FIELDS WITH CAUTION! We have subsequently filled in the period from October 2010 to present with the hindcast using the reduced ocean model time step. Because PIPS 2.0 is a legacy system and will soon be replaced with a new ice nowcast/forecast system (see below), little additional effort will be expended to keep it running.
On a positive note, NRL is announcing the release of the Arctic Cap Nowcast/Forecast System (ACNFS) website. This is the Navy’s state-of-the-art coupled ice/ocean data assimilative ice forecasting system for the Northern Hemisphere. ACNFS is currently undergoing operational testing at the Naval Oceanographic Office and the National Ice Center. This work is scheduled to be completed by the end of December 2011.
Hmm, only two links in the comment and it’s still gone to moderation? Steve, could you retrieve it? Thanks.