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| Titel |
Antarctic summer sea ice concentration and extent: comparison of ODEN 2006 ship observations, satellite passive microwave and NIC sea ice charts |
| VerfasserIn |
B. Ozsoy-Cicek, H. Xie, S. F. Ackley, K. Ye |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 3, no. 1 ; Nr. 3, no. 1 (2009-02-03), S.1-9 |
| Datensatznummer |
250000780
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| Publikation (Nr.) |
 copernicus.org/tc-3-1-2009.pdf |
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| Zusammenfassung |
| Antarctic sea ice cover has shown a slight increase (<1%/decade) in
overall observed ice extent as derived from satellite mapping from 1979 to
2008, contrary to the decline observed in the Arctic regions. Spatial and
temporal variations of the Antarctic sea ice however remain a significant
problem to monitor and understand, primarily due to the vastness and
remoteness of the region. While satellite remote sensing has provided and
has great future potential to monitor the variations and changes of sea ice,
uncertainties remain unresolved. In this study, the National Ice Center
(NIC) ice edge and the AMSR-E (Advanced Microwave Scanning Radiometer-Earth Observing System) ice extent are examined, while the ASPeCt (Antarctic
Sea Ice Process and Climate) ship observations from the Oden expedition in
December 2006 are used as ground truth to verify the two products during
Antarctic summer. While there is a general linear trend between ASPeCt and
AMSR-E ice concentration estimates, there is poor correlation (R2=0.41)
and AMSR-E tends to underestimate the low ice concentrations. We also found
that the NIC sea ice edge agrees well with ship observations, while the
AMSR-E shows the ice edge further south, consistent with its poorer
detection of low ice concentrations. The northward extent of the ice edge at
the time of observation (NIC) had mean values varying from 38 km to 102 km
greater on different days for the area as compared with the AMSR-E sea ice
extent. For the circumpolar area as a whole in the December period examined,
AMSR-E therefore may underestimate the area inside the ice edge at this time
by up to 14% or, 1.5 million km2 less area, compared to the NIC ice
charts. Preliminary comparison of satellite scatterometer data however,
suggests better resolution of low concentrations than passive microwave, and
therefore better agreement with ship observations and NIC charts of the area
inside the ice edge during Antarctic summer. A reanalysis data set for
Antarctic sea ice extent that relies on the decade long scatterometer and
high resolution satellite data set, instead of passive microwave, may
therefore give better fidelity for the recent sea ice climatology. |
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