Climate Dynamics

, Volume 22, Issue 6–7, pp 591–595

Actual and insolation-weighted Northern Hemisphere snow cover and sea-ice between 1973–2002

  • R. A. PielkeSr.
  • G. E. Liston
  • W. L. Chapman
  • D. A. Robinson
Article

Abstract

Actual and insolation-weighted Northern Hemisphere snow cover and sea ice are binned by latitude bands for the years 1973–2002. Antarctic sea-ice is also analyzed for the years 1980–2002. The use of insolation weighting provides an improved estimate of the radiative feedbacks of snow cover and sea-ice into the atmosphere. One conclusion of our assessment is that while a decrease in both areal and insolation-weighted values have occurred, the data does not show a monotonic decrease of either Arctic sea-ice or Northern Hemisphere snow cover. If Arctic perennial sea-ice is decreasing since the total reduction in areal coverage is relatively small, a large portion of it is being replenished each year such that its radiative feedback to the atmosphere is muted. Antarctic sea-ice areal cover shows no significant long-term trend, while there is a slight decrease in the insolation-weighted values for the period 1980–2002. From the early 1990s to 2001, there was a slight increase in both values. The comparison of general circulation model simulations of changes over the last several decades to observed changes in insolation-weighted sea-ice and snow cover should be a priority research topic.

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Copyright information

© Springer-Verlag  2004

Authors and Affiliations

  • R. A. PielkeSr.
    • 1
  • G. E. Liston
    • 1
  • W. L. Chapman
    • 2
  • D. A. Robinson
    • 3
  1. 1.Department of Atmospheric Science Colorado State UniversityFort CollinsUSA
  2. 2.Department of Atmospheric Sciences University of Illinois at Urbana-ChampaignUrbanaUSA
  3. 3.Department of GeographyRutgers UniversityPiscatawayUSA

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