全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

夏季北极密集冰区范围确定及其时空变化研究

DOI: 10.3969/j.issn.0253-4193.2013.04.005, PP. 36-46

Keywords: 密集冰区,海冰边缘区,密集度阈值,腐蚀算法,连通域法

Full-Text   Cite this paper   Add to My Lib

Abstract:

研究夏季北极密集冰区的范围变化是了解北极海冰融化过程的重要手段。密集冰区与海冰边缘区之间没有明确的分界线,海冰密集度在两者之间平滑过渡,确定密集冰区范围就需确定一个密集度阈值。文中依据分辨率为6.25km的AMSR-E遥感数据,发现不同密集度阈值所围范围在密集冰区边缘处的减小存在由快变慢的过程,同时与周围格点的密集度差异变化在该处最为显著,对这两个特征进行统计分析,获得的阈值同为89%,具有明确的物理意义和合理性。以此为基础,运用腐蚀算法剔除海冰边缘区,同时结合连通域法排除小范围密集冰的影响,进而确定密集冰区的范围。结果表明,2002-2006年密集冰区覆盖范围较大,年际变化较小,2007年以后明显减小,2010年与2011年相继出现最小值,其中2011年的范围最小值仅为2006年的64%。密集冰区范围的变化不同于海冰覆盖范围,是具有独立特性的海冰变化参数,反映出高密集度海冰区域的变化特征。海冰的融化与海冰边缘区的变化是导致密集冰区范围发生变化的两个主要因素,受动力学因素的影响,海冰边缘区发生伸展或收缩,发生密集冰区与海冰边缘区互相转化。本文提出了一种研究北极海冰变化的新思路,密集冰区覆盖范围的减小表明北极中央区域高密集度海冰正持续减少。

References

[1]  Comiso J C, Parkinson C L, Gersten R, et al. Accelerated decline in the Arctic sea ice cover[J]. Geophys.Res. Lett., 2008, 35, L01703, doi:10.1029/2007GL031972.
[2]  Perovich D K, Richter-Menge J A, Jones K F, et al. Sunlight, water, and ice: Extreme Arctic sea ice melt during the summer of 2007[J].Geophys Res Lett, 2008, 35, L11501, doi:10.1029/2008GL034007.
[3]  Stroeve J, Serreze M, Drobot S, et al. Arctic Sea Ice extent plummets in 2007[J].Eos Trans AGU, 2008, 89(2): 13, doi:10.1029/2008EO020001.
[4]  Rigor I G, Wallace J M. Variations in the age of Arctic sea-ice and summer sea-ice extent[J].Geophys Res Lett, 2004, 31:L09401.
[5]  赵进平, 李涛, 张树刚, 等.北冰洋中央密集冰区海冰对太阳短波辐射能吸收的观测研究[J]. 地球科学进展, 2009, 24(1):33-41.
[6]  Pichel W G, Clemente-Colón P, Bertoia C, et al. Routine production of SAR-derived ice and ocean products in the United States[R]. Proc. 2nd Workshop Coastal and Marine Appl. SAR, Svalbard, Norway, Sep.8-12, 2003:175-182.
[7]  Spreen G, Kaleschke L, Heygster G.Sea ice remote sensing using AMSR-E 89-GHz channels[J]. J Geophys Res, 2008, 113: C02S03, doi:10.1029/2005JC003384.
[8]  赵进平, 任敬平.从航空数字影像提取北极海冰形态参数的方法研究[J]. 遥感学报, 2000, 4(4):271-278.
[9]  李涛, 赵进平, 朱大勇. 1997-2005年北极东西伯利亚海海冰变化特征研究[J]. 冰川冻土, 2009, 31(5):822-828.
[10]  Francis J A, Hunter E. New insight into the disappearing Arctic sea ice[J]. Eos Trans AGU, 2006, 87:509-511.
[11]  Wu B, Wang Jia, John Walsh E. Dipole anomaly in the winter Arctic atmosphere and its association with sea ice motion[J]. Journal of Climate, 2006, 19:210-225.
[12]  Woodgate R A, Aagaard K, Weingartner T J. Interannual changes in the Bering Strait fluxes of volume, heat and freshwater between 1991 and 2004[J]. Geophys Res Lett, 2006, 33: L15609, doi:10.1029/2006GL026931.
[13]  赵进平, 史久新.北极环极边界流研究及其主要科学问题[J].极地研究, 2004, 16(3):157-170.
[14]  Donald K Perovich, Jacqueline A Richter-Menge. Loss of sea ice in the Arctic[J]. Annu Rev Marine Sci, 2009, 1:417-441.
[15]  Smedsrud L H, Sorteberg A, Kloster K. Recent and future changes of the Arctic sea-ice cover[J]. Geophys Res Lett, 2008, 35, L20503, doi:10.1029/2008GL034813.
[16]  National Snow and Ice Data Center. Arctic Sea Ice News and Analysis [EB/OL].[2013-03-01]. http://nsidc.org/arcticseaicenews/.
[17]  Barber D G, Galley R, Asplin M G, et al. Perennial pack ice in the southern Beaufort Sea was not as it appeared in the summer of 2009[J]. Geophys Res Lett, 2009, 36: L24501, doi:10.1029/2009GL041434.
[18]  Comiso J C. A rapidly declining perennial sea ice cover in the Arctic[J]. Geophys Res Lett, 2002, 29(20): 1956, doi:10.1029/2002GL015650.
[19]  Fu H, Zhao Jinping, Karen Frey. Investigation of polynya dynamics in the northern Bering Sea using grayscale morphology image processing techniques[J]. International Journal of Remote Sensing, 2012, 33(7):2214-2232.
[20]  Nghiem S V, Rigor I G, Perovich D K, et al. Rapid reduction of Arctic perennial sea ice[J]. Geophys Res Lett, 2007, 34:L19504, doi:10.1029/2007GL031138.
[21]  Heinrichs J F, Donald J C, Thorsten M. Assessment of the AMSR-E sea ice concentration product at the ice edge using RADARSAT-1and MODIS imagery[J]. IEEE Transactions on Geoscience and Remonte Sensing, 2006, 44(11), doi: 10.1109/TGRS.2006.880622.
[22]  张树刚.海冰密集度反演以及北极中央区海冰和融池变化物理过程研究[D]. 青岛:中国海洋大学, 2012.
[23]  Deser C, Teng H. Evolution of Arctic sea ice concentration trends and the role of atmospheric circulation forcing, 1979-2007[J].Geophys Res Lett, 2008, 35:L02504, doi:10.1029/2007GL032023.
[24]  Francis J A, Hunter E. Drivers of declining sea ice in the Arctic winter: A tale of two seas[J]. Geophys Res Lett, 2007, 34:L17503, doi:10.1029/2007GL030995.
[25]  Lupkes C, Birnbaum G. Surface drag in the Arctic marginal sea-ice zone: a comparison of different parameterization concepts[J]. Boundary-Layer Meteorology, 2005, 117: 179-211, doi:10.1007/s10546-005-1445-8.
[26]  Serreze M C, Holland M M, Stroeve J. Perspectives on the Arctic\'s shrinking sea-ice cover[J].Science, 2007, 315:1533-1536.
[27]  Watanabe E, Wang J, Sumi A, et al.Arctic dipole anomaly and its contribution to sea ice export from the Arctic Ocean in the20th century[J]. Geophys Res Lett, 2006, 33: L23703, doi:10.1029/2006GL028112.
[28]  Jones E P. Circulation in the Arctic Ocean[J]. Polar Research, 2001, 20(2): 139-146.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133