The role of large-scale circulation on the consistent positive salinity anomaly in the Indian sector of the Antarctic

Ni Xubin; Du Ling; Shi Huangyuan

doi:10.12284/hyxb2021111

Volume 43 Issue 7

Jul. 2021

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Ni Xubin，Du Ling，Shi Huangyuan. The role of large-scale circulation on the consistent positive salinity anomaly in the Indian sector of the Antarctic[J]. Haiyang Xuebao，2021, 43(7)：23–34 doi: 10.12284/hyxb2021111

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The role of large-scale circulation on the consistent positive salinity anomaly in the Indian sector of the Antarctic

doi: 10.12284/hyxb2021111

Ni Xubin^1
,,
Du Ling^{1
,
,},
Shi Huangyuan¹

College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China

Received Date: 2020-12-29
Rev Recd Date: 2021-01-27

Available Online: 2021-06-08

Publish Date: 2021-07-25

Abstract

Abstract

The key regions for formation of the Antarctic Bottom Water occupied in the Indian sector of the Southern Ocean. The salinity change of the region has a profound influence on the global climate change. EN4 reanalysis-gridded data, measured seal data, WOD18 data combined with atmospheric reanalysis and sea ice concentration data were all used to explore the sea surface salinity changes in the Indian sector of the Southern Ocean and the response to large-scale circulation anomaly. The observation and reanalysis data both illustrated a significant positive surface salinity anomaly occurred in the Antarctic coast since 2008, especially in the Indian sector. The surface positive salinity anomaly was mainly centered in the Darnley Polynya and the north of Shackleton Ice Shelf. The high salinity shelf water expanded northward from the Antarctic coast and deepened. Meanwhile, the upwelling of Circumpolar Deep Water became increasingly distinct. Our study showed that this positive salinity anomaly was connected with the Antarctic Oscillation (AAO) and the Indian Ocean Dipole (IOD). During the positive AAO and IOD phases, the westerly wind enhanced significantly in the Indian sector and promoted the formation of sea ice, which increased surface salt flux. The significant negative wind curl and low pressure anomaly resulted in the upwelling of salty Circumpolar Deep Water and maintained the positive salinity anomaly. Additionally, increased locally zonal wind shear and enhanced evaporation were important factors as well.
- positive salinity anomaly,
- the Indian sector of the Antarctic,
- Antarctic Oscillation,
- Indian Ocean dipole

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References

[1]	Haumann F A, Gruber N, Münnich M, et al. Sea-ice transport driving Southern Ocean salinity and its recent trends[J]. Nature, 2016, 537(7618): 89−92. doi: 10.1038/nature19101
[2]	Durack P J. Ocean salinity and the global water cycle[J]. Oceanography, 2015, 28(1): 20−31. doi: 10.5670/oceanog.2015.03
[3]	Durack P J, Wijffels S E. Fifty-year trends in global ocean salinities and their relationship to broad-scale warming[J]. Journal of Climate, 2010, 23(16): 4342−4362. doi: 10.1175/2010JCLI3377.1
[4]	Curran M A J, Van Ommen T D, Morgan V I, et al. Ice core evidence for Antarctic sea ice decline since the 1950s[J]. Science, 2003, 302(5648): 1203−1206. doi: 10.1126/science.1087888
[5]	林丽娜, 陈红霞, 刘娜. 普里兹湾及邻近海域多航次水文特征比较分析[J]. 海洋科学进展, 2015, 33(4): 460−470. doi: 10.3969/j.issn.1671-6647.2015.04.004 Lin Li’na, Chen Hongxia, Liu Na. A comparative analysis on hydrographic features during several cruises in the region of Prydz Bay, Antarctic[J]. Advances in Marine Science, 2015, 33(4): 460−470. doi: 10.3969/j.issn.1671-6647.2015.04.004
[6]	陈红霞, 林丽娜, 史久新. 南极普里兹湾及其邻近海域水团研究[J]. 海洋学报, 2014, 36(7): 1−8. Chen Hongxia, Lin Li’na, Shi Jiuxin. Study on water masses in Prydz Bay and its adjacent sea area[J]. Haiyang Xuebao, 2014, 36(7): 1−8.
[7]	徐智昕, 许建平, 高郭平, 等. 2011年冬季南极普里兹湾及其邻近海域水文特征与水团分析[J]. 海洋科学进展, 2016, 34(2): 226−239. doi: 10.3969/j.issn.1671-6647.2016.02.008 Xu Zhixin, Xu Jianping, Gao Guoping, et al. Study on hydrographic features and water masses in the Prydz Bay and its adjacent waters in Antarctic winter of 2011[J]. Advances in Marine Science, 2016, 34(2): 226−239. doi: 10.3969/j.issn.1671-6647.2016.02.008
[8]	林丽娜, 陈红霞, 刘娜. 南极普里兹湾73°E断面地转流及水文特征分析[J]. 海洋科学进展, 2013, 31(3): 332−342. doi: 10.3969/j.issn.1671-6647.2013.03.005 Lin Li’na, Chen Hongxia, Liu Na. Zonal geostrophic currents and hydrographic features along 73°E in the Prydz Bay, Antarctica[J]. Advances in Marine Science, 2013, 31(3): 332−342. doi: 10.3969/j.issn.1671-6647.2013.03.005
[9]	Masuda S. Determining subsurface oceanic changes in the Indian sector of the Southern Ocean using Argo float data[J]. Polar Science, 2020, 23: 100498. doi: 10.1016/j.polar.2019.100498
[10]	Pezza A B, Rashid H A, Simmonds I. Climate links and recent extremes in Antarctic sea ice, high-latitude cyclones, Southern Annular Mode and ENSO[J]. Climate Dynamics, 2012, 38(1/2): 57−73.
[11]	Cheon W G, Cho C B, Gordon A L, et al. The role of oscillating Southern Hemisphere westerly winds: Southern Ocean coastal and open-ocean polynyas[J]. Journal of Climate, 2018, 31(3): 1053−1073. doi: 10.1175/JCLI-D-17-0237.1
[12]	Hazel J E, Stewart A L. Are the near-Antarctic easterly winds weakening in response to enhancement of the Southern Annular Mode?[J]. Journal of Climate, 2019, 32(6): 1895−1918. doi: 10.1175/JCLI-D-18-0402.1
[13]	Nuncio M, Yuan Xiaojun. The influence of the Indian Ocean dipole on Antarctic sea ice[J]. Journal of Climate, 2015, 28(7): 2682−2690. doi: 10.1175/JCLI-D-14-00390.1
[14]	Yang Jiao, Du Zhiheng, Xiao Cunde. Sea salt sodium record in a shallow ice core from east Antarctica as a potential proxy of the Antarctic sea ice extent in Southern Indian Ocean[J]. Journal of Ocean University of China, 2019, 18(6): 1351−1359. doi: 10.1007/s11802-019-4084-2
[15]	Graham J A, Heywood K J, Chavanne C P, et al. Seasonal variability of water masses and transport on the Antarctic continental shelf and slope in the southeastern Weddell Sea[J]. Journal of Geophysical Research: Oceans, 2013, 118(4): 2201−2214. doi: 10.1002/jgrc.20174
[16]	Ohshima K I, Fukamachi Y, Williams G D, et al. Antarctic bottom water production by intense sea-ice formation in the Cape Darnley Polynya[J]. Nature Geoscience, 2013, 6(3): 235−240. doi: 10.1038/ngeo1738
[17]	丁卓铭, 张林, 卞林根, 等. 普里兹湾沿岸下降风特征分析[J]. 极地研究, 2015, 27(4): 351−363. Ding Zhuoming, Zhang Lin, Bian Lingen, et al. Analysis of katabatic winds on the coast of Prydz Bay[J]. Chinese Journal of Polar Research, 2015, 27(4): 351−363.
[18]	Aoki S, Ono K, Hirano D, et al. Continuous winter oceanic profiling in the Cape Darnley Polynya, East Antarctica[J]. Journal of Oceanography, 2020, 76(5): 365−372. doi: 10.1007/s10872-020-00550-w
[19]	Good S A, Martin M J, Rayner N A. EN4: Quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates[J]. Journal of Geophysical Research: Oceans, 2013, 118(12): 6704−6716. doi: 10.1002/2013JC009067
[20]	Boyer T P, Antonov J I, Baranova O K, et al. World ocean database 2013[R]. Silver Spring: NOAA, 2013.
[21]	Roquet F, Williams G, Hindell M A, et al. A Southern Indian Ocean database of hydrographic profiles obtained with instrumented elephant seals[J]. Scientific Data, 2014, 1(1): 140028. doi: 10.1038/sdata.2014.28
[22]	ERA5 monthly averaged data on single levels from 1979 to present[DB/OL]. (2019–04–18) [2020–12–28]. https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means?tab=overview.
[23]	Saji N H, Yamagata T. Possible impacts of Indian Ocean dipole mode events on global climate[J]. Climate Research, 2003, 25(2): 151−169.
[24]	Comiso J C, Nishio F. Trends in the sea ice cover using enhanced and compatible AMSR-E, SSM/I, and SMMR data[J]. Journal of Geophysical Research: Oceans, 2008, 113(C2): C02S07.
[25]	Kern S, Lavergne T, Notz D, et al. Satellite passive microwave sea-ice concentration data set intercomparison: Closed ice and ship-based observations[J]. The Cryosphere, 2019, 13(12): 3261−3307.
[26]	Yuan Xiaojun, Martinson D G. The Antarctic dipole and its predictability[J]. Geophysical Research Letters, 2001, 28(18): 3609−3612. doi: 10.1029/2001GL012969
[27]	史久新. 南极冰架–海洋相互作用研究综述[J]. 极地研究, 2018, 30(3): 287−302. Shi Jiuxin. A review of ice shelf-ocean interaction in Antarctica[J]. Chinese Journal of Polar Research, 2018, 30(3): 287−302.
[28]	Guo Guijun, Shi Jiuxin, Gao Libao, et al. Reduced sea ice production due to upwelled oceanic heat flux in Prydz Bay, East Antarctica[J]. Geophysical Research Letters, 2019, 46(9): 4782−4789. doi: 10.1029/2018GL081463
[29]	Campbell E C, Wilson E A, Moore G W K, et al. Antarctic offshore polynyas linked to Southern Hemisphere climate anomalies[J]. Nature, 2019, 570(7761): 319−325. doi: 10.1038/s41586-019-1294-0
[30]	Langlais C E, Rintoul S R, Zika J D. Sensitivity of Antarctic circumpolar current transport and eddy activity to wind patterns in the Southern Ocean[J]. Journal of Physical Oceanography, 2015, 45(4): 1051−1067. doi: 10.1175/JPO-D-14-0053.1
[31]	Thompson A F, Stewart A L, Spence P, et al. The Antarctic slope current in a changing climate[J]. Reviews of Geophysics, 2018, 56(4): 741−770. doi: 10.1029/2018RG000624
[32]	Yu Lejiang, Yang Qinghua, Vihma T, et al. Features of extreme precipitation at progress station, Antarctica[J]. Journal of Climate, 2018, 31(22): 9087−9105. doi: 10.1175/JCLI-D-18-0128.1
[33]	Grieger J, Leckebusch G C, Raible C C, et al. Subantarctic cyclones identified by 14 tracking methods, and their role for moisture transports into the continent[J]. Tellus A: Dynamic Meteorology and Oceanography, 2018, 70(1): 1−18.
[34]	Lefebvre W, Goosse H. An analysis of the atmospheric processes driving the large-scale winter sea ice variability in the Southern Ocean[J]. Journal of Geophysical Research: Oceans, 2008, 113(C2): C02004.4.