气候变化领域集成服务门户(CCPortal): Physical Properties of Summer Sea Ice in the Pacific Sector of the Arctic During 2008

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DOI	10.1029/2020JC016371
	Physical Properties of Summer Sea Ice in the Pacific Sector of the Arctic During 2008–2018
	Wang Q.; Lu P.; Leppäranta M.; Cheng B.; Zhang G.; Li Z.
发表日期	2020
ISSN	21699275
卷号	125 期号:9
英文摘要	Sea ice physical properties were determined at 21 first-year ice (FYI) and 20 multiyear ice (MYI) stations in the Pacific sector of the Arctic during summer in 2008–2018. The bulk ice temperature was between −2.7 and −0.3 °C for FYI and between −1.7 and −0.2 °C for MYI. The bulk salinity was 0.4–3.2 practical salinity unit (psu) for FYI and 0.4–2.4 psu for MYI. A low-salinity layer and an almost fresh layer were always present at the top of FYI and MYI, respectively. The bulk density was 600.3–900.1 kg/m3 for FYI and 686.1–903.3 kg/m3 for MYI. The upper layer density was less than the lower layer density due to higher gas content. Salinity and density were less than previously reported values of summer sea ice, and their parameterization formulae were updated. The brine and gas volume fractions were determined based on the measured ice temperature, salinity, and density. The average bulk brine and gas volume fractions were 11.3 ± 6.2% and 14.9 ± 7.9% for FYI and 9.5 ± 11.0% and 13.5 ± 12.7% for MYI. Typical brine and gas volume fraction profiles were identified and parameterized using regression analysis. The large brine and gas content of sea ice affects the sea ice melting. The energy used to melt a unit volume of summer Arctic sea ice was estimated as (2.26 ± 0.29) × 105 kJ for FYI and (2.36 ± 0.24) × 105 kJ for MYI. This study shows that the current physical state of the Arctic summer sea ice is different from earlier sea ice climatology, and the results will guide further research and modeling of Arctic sea ice. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186667
作者单位	State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China; School of Naval Architecture Engineering, Dalian University of Technology, Dalian, China; Institute of Atmospheric and Earth Sciences, University of Helsinki, Helsinki, Finland; Finnish Meteorological Institute, Helsinki, Finland
推荐引用方式 GB/T 7714	Wang Q.,Lu P.,Leppäranta M.,等. Physical Properties of Summer Sea Ice in the Pacific Sector of the Arctic During 2008–2018[J],2020,125(9).
APA	Wang Q.,Lu P.,Leppäranta M.,Cheng B.,Zhang G.,&Li Z..(2020).Physical Properties of Summer Sea Ice in the Pacific Sector of the Arctic During 2008–2018.Journal of Geophysical Research: Oceans,125(9).
MLA	Wang Q.,et al."Physical Properties of Summer Sea Ice in the Pacific Sector of the Arctic During 2008–2018".Journal of Geophysical Research: Oceans 125.9(2020).