Regional variability of Arctic sea ice seasonal change climate indicators from a passive microwave climate data record
Regional variability of Arctic sea ice seasonal change climate indicators from a passive microwave climate data record
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DOI：
10.1088/1748-9326/aafb84
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发表时间：
2019-04-01
影响因子：
6.7
通讯作者：
Dickinson, Suzanne
中科院分区：
文献类型：
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作者：
Bliss, Angela C.;Steele, Michael;Dickinson, Suzanne
北极海冰的季节演变可以用海冰密集度（SIC）变化的关键日期在其年周期中的进退时间来描述。在这里，我们使用SICs从卫星被动微波气候数据记录，以确定海冰的开放日期（DOO），撤退（DOR），前进（DOA），关闭（DOC）和这些事件之间的时间段。研究了1979-2016年融化季节期间12个北极地区这些关键日期、时期和海冰融化开始和冻结日期的区域变化。我们发现统计上显着的积极趋势，在大部分的北极东部，白令海，哈德逊和巴芬湾的融化季节（外部无冰期）的长度与趋势高达11.9 D十年（-1）在喀拉海观察。在DOR和DOA的趋势有助于统计上显着增加的开放水域的时间长度为所有区域在北冰洋范围从3.9到13.8 d十年（-1）。冰退期（DOR-DOO）的长度从鄂霍次克海的17.1 d到格陵兰海的41 d不等。鄂霍次克海和格陵兰海的冰进期（DOC-DOA）一般较短，分别为17.9 ~ 25.3d。此外，我们得出的季节性冰区（SIZ）的范围，并发现统计上显着的负趋势（SIZ正在缩小）在鄂霍次克海，巴芬湾，格陵兰海和巴伦支海地区，这是地理上开放的海洋和减少冬季海冰范围的影响。在北冰洋区域内，统计上显著的积极趋势表明，随着北极夏季海冰的减少，SIZ的范围正在扩大。
The seasonal evolution of Arctic sea ice can be described by the timing of key dates of sea ice concentration (SIC) change during its annual retreat and advance cycle. Here, we use SICs from a satellite passive microwave climate data record to identify the sea ice dates of opening (DOO), retreat (DOR), advance (DOA), and closing (DOC) and the periods of time between these events. Regional variability in these key dates, periods, and sea ice melt onset and freeze-up dates for 12 Arctic regions during the melt seasons of 1979-2016 is investigated. We find statistically significant positive trends in the length of the melt season (outer ice-free period) for most of the eastern Arctic, the Bering Sea, and Hudson and Baffin Bays with trends as large as 11.9 d decade(-1) observed in the Kara Sea. Trends in the DOR and DOA contribute to statistically significant increases in the length of the open water period for all regions within the Arctic Ocean ranging from 3.9 to 13.8 d decade(-1). The length of the ice retreat period (DOR-DOO) ranges from 17.1 d in the Sea of Okhotsk to 41 d in the Greenland Sea. The length of the ice advance period (DOC-DOA) is generally much shorter and ranges from 17.9 to 25.3 d in the Sea of Okhotsk and Greenland Sea, respectively. Additionally, we derive the extent of the seasonal ice zone (SIZ) and find statistically significant negative trends (SIZ is shrinking) in the Sea of Okhotsk, Baffin Bay, Greenland Sea, and Barents Sea regions, which are geographically open to the oceans and influenced by reduced winter sea ice extent. Within regions of the Arctic Ocean, statistically significant positive trends indicate that the extent of the SIZ is expanding as Arctic summer sea ice declines.