Predicting September sea ice: Ensemble skill of the SEARCH Sea Ice Outlook 2008–2013

Since 2008, the Study of Environmental Arctic Change Sea Ice Outlook has solicited predictions of September sea-ice extent from the Arctic research community. Individuals and teams employ a variety of modeling, statistical, and heuristic approaches to make these predictions. Viewed as monthly ensembles each with one or two dozen individual predictions, they display a bimodal pattern of success. In years when observed ice extent is near its trend, the median predictions tend to be accurate. In years when the observed extent is anomalous, the median and most individual predictions are less accurate. Statistical analysis suggests that year-to-year variability, rather than methods, dominate the variation in ensemble prediction success. Furthermore, ensemble predictions do not improve as the season evolves. We consider the role of initial ice, atmosphere and ocean conditions, and summer storms and weather in contributing to the challenge of sea-ice prediction.

[1]  M. Steele,et al.  Did unusually sunny skies help drive the record sea ice minimum of 2007? , 2008 .

[2]  Marika M. Holland,et al.  Perspectives on the Arctic's Shrinking Sea-Ice Cover , 2007, Science.

[3]  Ron Kwok,et al.  Thinning and volume loss of the Arctic Ocean sea ice cover: 2003–2008 , 2009 .

[4]  W. Emery,et al.  A younger, thinner Arctic ice cover: Increased potential for rapid, extensive sea‐ice loss , 2007 .

[5]  Jinlun Zhang,et al.  Is the Dipole Anomaly a major driver to record lows in Arctic summer sea ice extent? , 2009 .

[6]  Frank Kauker,et al.  Adjoint analysis of the 2007 all time Arctic sea‐ice minimum , 2009 .

[7]  Arun Kumar,et al.  Role of the Pacific‐North American (PNA) pattern in the 2007 Arctic sea ice decline , 2008 .

[8]  Michael Steele,et al.  What drove the dramatic retreat of arctic sea ice during summer 2007? , 2008 .

[9]  L. Tremblay,et al.  Analysis of Arctic Sea Ice Anomalies in a Coupled Model Control Simulation , 2013 .

[10]  Jinlun Zhang,et al.  Ensemble 1‐Year predictions of Arctic sea ice for the spring and summer of 2008 , 2008 .

[11]  J. Kay,et al.  The Arctic’s rapidly shrinking sea ice cover: a research synthesis , 2012, Climatic Change.

[12]  M. Déqué,et al.  Seasonal Forecasts of the Pan-Arctic Sea Ice Extent Using a GCM-Based Seasonal Prediction System , 2013 .

[13]  Michael Steele,et al.  Seasonal predictions of ice extent in the Arctic Ocean , 2008 .

[14]  M. Holland,et al.  Changing seasonal sea ice predictor relationships in a changing Arctic climate , 2011 .

[15]  M. Holland,et al.  Influence of initial conditions and climate forcing on predicting Arctic sea ice , 2011 .

[16]  R. Gerdes,et al.  Modeling the 20th century Arctic Ocean/Sea ice system: Reconstruction of surface forcing , 2008 .

[17]  M. Holland,et al.  Trends in Arctic sea ice extent from CMIP5, CMIP3 and observations , 2012 .

[18]  G. Flato,et al.  Seasonal forecast skill of Arctic sea ice area in a dynamical forecast system , 2013 .

[19]  A. Rosati,et al.  System Design and Evaluation of Coupled Ensemble Data Assimilation for Global Oceanic Climate Studies , 2007 .

[20]  Julienne C. Stroeve,et al.  Arctic Sea Ice Extent Plummets in 2007 , 2008 .

[21]  W. Emery,et al.  Distribution and trends in Arctic sea ice age through spring 2011 , 2011 .

[22]  William J. Emery,et al.  Satellite-derived evolution of Arctic sea ice age: October 1978 to March 2003 , 2004, IEEE Geoscience and Remote Sensing Letters.

[23]  Sheldon Drobot,et al.  Using remote sensing data to develop seasonal outlooks for Arctic regional sea-ice minimum extent , 2007 .

[24]  Lawrence C. Hamilton,et al.  Statistics with STATA - Version 12 , 2008 .

[25]  D. A. Rothrock,et al.  Modeling Global Sea Ice with a Thickness and Enthalpy Distribution Model in Generalized Curvilinear Coordinates , 2003 .

[26]  J. Stroeve,et al.  Arctic Sea Ice Decline , 2012 .

[27]  Michael Steele,et al.  Arctic Sea Ice Retreat in 2007 Follows Thinning Trend , 2008 .

[28]  Andrew Gettelman,et al.  The contribution of cloud and radiation anomalies to the 2007 Arctic sea ice extent minimum , 2008 .

[29]  Marika M. Holland,et al.  Inherent sea ice predictability in the rapidly changing Arctic environment of the Community Climate System Model, version 3 , 2011 .

[30]  J. Marotzke,et al.  Predictability of large interannual Arctic sea-ice anomalies , 2013, Climate Dynamics.