Antarctic sea-ice extents and concentrations: comparison of satellite and ship measurements from International Polar Year cruises


Ozsoy-Cicek B. , ACKLEY S. F. , WORBY A., XIE H., LIESER J.

ANNALS OF GLACIOLOGY, vol.52, no.57, pp.318-326, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 52 Issue: 57
  • Publication Date: 2011
  • Doi Number: 10.3189/172756411795931877
  • Title of Journal : ANNALS OF GLACIOLOGY
  • Page Numbers: pp.318-326

Abstract

Antarctic Sea Ice Processes and Climate (ASPeCt) ship-based ice observations, conducted during the Sea Ice Mass Balance in the Antarctic (SIMBA) and Sea Ice Physics and Ecosystem eXperiment (SIPEX) International Polar Year (IPY) cruises (September-October 2007), are used to validate remote-sensing measurements of ice extent and concentration. Observations include varied sea-ice types at and inside the ice edge of West (similar to 90 degrees E) and East (similar to 120 degrees E) Antarctica. Time series of Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E) ice extents and US National Ice Center (NIC) ice edges were obtained for the 2007-08 periods bracketing the period these cruises were conducted. A comparison between passive microwave satellite imagery and ASPeCt observations of sea-ice concentration during two cruises was also performed. In 90 degrees W regions, the concentrated pack ice indicated good correlation between ship observations and passive microwave estimates of the ice concentration (R-2= 0.80). In the marginal zone of West Antarctica and over nearly the entire sea-ice zone of East Antarctica, correlation dropped to R-2 <0.60. These findings are consistent with other studies comparing passive microwave and ship observations and further verify that the East Antarctic sea-ice zone is more marginal in character. There are significant ice-edge differences between AMSR-E and NIC between late November 2007 and early March 2008 such that the AMSR-E sea-ice extent estimate is 1-2 x 10(6) km(2) less than the NIC estimate.