期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 10, 页码 3510-3516出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059821
关键词
Ice core; Geochemistry; Sea ice; Antarctica; Climate
资金
- New Zealand Ministry of Business, Innovation and Employment [VICX0704, CO5X0202, RDF-VUW1103]
- N.Z. Foundation for Research, Science, and Technology [CO5X0902]
- Antarctica New Zealand [K049]
- U.S. Antarctic Program [K049]
We present the first proxy record of sea-ice area (SIA) in the Ross Sea, Antarctica, from a 130year coastal ice-core record. High-resolution deuterium excess data show prevailing stable SIA from the 1880s until the 1950s, a 2-5% reduction from the mid-1950s to the early-1990s, and a 5% increase after 1993. Additional support for this reconstruction is derived from ice-core methanesulphonic acid concentrations and whaling records. While SIA has continued to decline around much of the West Antarctic coastline since the 1950s, concurrent with increasing air and ocean temperatures, the underlying trend is masked in the Ross Sea by a switch to positive SIA anomalies since the early-1990s. This increase is associated with a strengthening of southerly winds and the enhanced northward advection of sea ice.
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