 |
| Titel |
New estimates of Arctic and Antarctic sea ice extent during September 1964 from recovered Nimbus I satellite imagery |
| VerfasserIn |
W. N. Meier, D. Gallaher, G. G. Campbell |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 2 ; Nr. 7, no. 2 (2013-04-23), S.699-705 |
| Datensatznummer |
250017960
|
| Publikation (Nr.) |
 copernicus.org/tc-7-699-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Visible satellite imagery from the 1964 Nimbus I satellite has been
recovered, digitized, and processed to estimate Arctic and Antarctic sea ice
extent for September 1964. September is the month when the Arctic sea ice
reaches its minimum annual extent and the Antarctic sea ice reaches its
maximum. Images from a three-week period were manually analyzed to estimate
the location of the ice edge and then composited to obtain a hemispheric
estimate. Uncertainties were based on limitations in the image analysis and
the variation of the ice cover over the three-week period. The 1964
Antarctic extent is higher than estimates from the 1979–present passive
microwave record, but is in accord with previous indications of higher
extents during the 1960s. The Arctic 1964 extent is near the 1979–2000
average from the passive microwave record, suggesting relatively stable
summer extents during the 1960s and 1970s preceding the downward trend since
1979 and particularly the large decrease in the last decade. These early
satellite data put the recently observed record into a longer-term context. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|