Sea ice surface features in Arctic summer 2008: Aerial observations
Sea ice surface features in Arctic summer 2008: Aerial observations
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DOI：
10.1016/j.rse.2009.11.009
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发表时间：
2010-04
影响因子：
13.5
通讯作者：
P. Lu;Zhijun Li;B. Cheng;R. Lei;Rui Zhang
中科院分区：
文献类型：
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作者：
P. Lu;Zhijun Li;B. Cheng;R. Lei;Rui Zhang
2008年中国第三次北极科学考察在太平洋北极区进行了8次直升机飞行，获得了9000多幅航空图像。沿着77°N和86°N之间的巡航轨迹，开阔水域和冰盖的面积分数分别从0.96变化到0.12和从0.03变化到0.81，而融化池的分数在0和0.2之间变化。从航空图像和AMSR-E/ASI产品中获得的冰浓度彼此相当，特别是在50- 90%的范围内。然而，卫星数据高估了14±9%，在大的冰浓度（>90%）的地区，几乎忽略了那些非常低的冰浓度（<20%）的航空观测。此外，与五年前相比，2008年夏季在PAS中观察到的融化池数量显著增加。在77°N的边缘冰区，区域平均冰密度从0.09增加到86°N的远北区的0.63，那里的冰密度为90%。由于冰浓度的总体下降，该区域的冰浓度明显小于PAS早期研究报告的同一区域的冰浓度。与2007年的数据相比，2008年的冰密集度较低，可能导致总的冰覆盖面积较小，尽管2008年的北极冰面积略大于2007年创纪录的最小值。
Eight helicopter flights were conducted, and more than 9000 aerial images were obtained during the Third Chinese National Arctic Research Expedition in 2008 in the Pacific Arctic Sector (PAS). Along the cruise tracks between 77°N and 86°N, area fractions of open water and ice cover varied from 0.96 to 0.12 and from 0.03 to 0.81, respectively, while the melt pond fraction varied between 0 and 0.2. The ice concentrations derived from aerial images and the AMSR-E/ASI products were comparable to each other, especially in the range of 50–90%. However, the satellite-derived data overestimated the aerial observations by 14±9% in areas with large ice concentrations (>90%), and nearly ignored those with very low ice concentrations (<20%). In addition, a significantly higher amount of melt ponds was observed in the PAS in the summer of 2008 as compared to five years ago. The areally averaged albedo increased from 0.09 in the marginal ice zone at 77°N to 0.63 in the far north zone at 86°N, where the ice concentration was 90%. The albedo was significantly smaller than those reported in earlier studies in the PAS for the same region because of an overall decrease in ice concentration. Compared with 2007 data, the lower ice concentration in 2008 may yield a smaller total ice-covered area, although the Arctic ice extent in 2008 was slightly larger than the record minimum in 2007.