Temperature variation in the South Orkney Islands, maritime Antarctic
Temperature variation in the South Orkney Islands, maritime Antarctic
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DOI：
10.1002/joc.8302
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发表时间：
2023-11
期刊：
影响因子：
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通讯作者：
Hua Lu;Steve Cowell;John C. King;Andrew Orr;T. Phillips;Emilia Dobb;Jonathan Xue;Sabina Kucieba;Guy Phillips;G. Marshall
中科院分区：
文献类型：
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作者：
Hua Lu;Steve Cowell;John C. King;Andrew Orr;T. Phillips;Emilia Dobb;Jonathan Xue;Sabina Kucieba;Guy Phillips;G. Marshall
南奥克尼群岛（SOIs）Signy站的气象记录最近被数字化，以涵盖1947-1995年期间。这项研究将Signy新获得的近地表气温与附近的Orcadas站的气温以及再分析数据集进行了比较，以提供更全面的SOI天气和气候变化情况。从两个站的温度显示出较高程度的变化，在冬季比夏季，但变化的主要风向和海冰的影响方面的关系不同。这两个站在各自的暖温事件方面有明显的不同，主要是由于西格尼站的地形引起的焚风，因为西北风流经加冕岛。ERA 5非常好地再现了月至年平均值，但低估了站点温度的冷尾和暖尾。SOI中的温度趋势也被认为是大尺度环流和巴西-福克兰汇流的海面温度的变化。然而，在解释从再分析数据估计的长期温度趋势时需要谨慎，因为大多数再分析显示1979年之前的冷偏差，这很可能是由海冰的错误表述造成的。
Meteorological records at Signy Station in the South Orkney Islands (SOIs) have recently been digitized to cover the period of 1947–1995. This study compares the newly available near‐surface air temperatures at Signy with those from a nearby station, Orcadas and with reanalysis datasets to provide a more comprehensive picture of the weather and climate variability in the SOIs. Temperatures from both stations show a higher degree of variability in winter than summer, but the variability differs in terms of its relationship to the dominant wind directions and sea ice influences. The two stations differ markedly in terms of their respective warm temperature events, largely due to orography‐induced föhn winds at Signy Station as northwesterlies flow over Coronation Island. ERA5 reproduces the monthly to annual averages exceedingly well but underestimates both cold and warm tails of station temperatures. Temperature trends in the SOIs are also considered in terms of changes in large‐scale circulation and the sea surface temperature over the Brazil‐Falkland Confluence. However, caution is required in interpreting the long‐term temperature trends estimated from reanalysis data as most of the reanalyses show a cold bias before 1979, which is most likely caused by misrepresentation of the sea ice.