首页|The sudden ocean warming and its potential influences on early-frozen landfast ice in the Prydz Bay,East Antarctica

The sudden ocean warming and its potential influences on early-frozen landfast ice in the Prydz Bay,East Antarctica

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The ocean conditions beneath the ice cover play a key role in understanding the sea ice mass balance in the polar regions.An integrated high-frequency ice-ocean observation system,including Acoustic Doppler Velocimeter,Conductivity-Temperature-Depth Sensor,and Sea Ice Mass Balance Array(SIMBA),was deployed in the landfast ice region close to the Chinese Zhongshan Station in Antarctica.A sudden ocean warming of 0.14℃(p<0.01)was observed beneath early-frozen landfast ice,from(-1.60±0.03)℃during April 16-19 to(-1.46±0.07)℃during April 20-23,2021,which is the only significant warming event in the nearly 8-month records.The sudden ocean warming brought a double rise in oceanic heat flux,from(21.7±11.1)W/m2 during April 16-19 to(44.8±21.3)W/m2 during April 20-23,2021,which shifted the original growth phase at the ice bottom,leading to a 2 cm melting,as shown from SIMBA and borehole observations.Simultaneously,the slowdown of ice bottom freezing decreased salt rejection,and the daily trend of observed ocean salinity changed from+0.02 d-1 during April 16-19,2021 to+0.003 d-1 during April 20-23,2021.The potential reasons are increased air temperature due to the transit cyclones and the weakened vertical ocean mixing due to the tide phase transformation from semi-diurnal to diurnal.The high-frequency observations within the ice-ocean boundary layer enhance the comprehensive investigation of the ocean's influence on ice evolution at a daily scale.

sudden ocean warmingoceanic heat fluxlandfast iceZhongshan Stationin-situ observation

Haihan Hu、Jiechen Zhao、Jingkai Ma、Igor Bashmachnikov、Natalia Gnatiuk、Bo Xu、Fengming Hui

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School of Geospatial Engineering and Science,Sun Yat-sen University,and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China

Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University),Ministry of Education,Zhuhai 519082,China

Qingdao Innovation and Development Base(Centre)of Harbin Engineering University,Qingdao 266500,China

Key Laboratory for Polar Acoustics and Application of Ministry of Education(Harbin Engineering University),Harbin 150001,China

Key Laboratory of Research on Marine Hazards Forecasting,National Marine Environmental Forecasting Centre,Beijing 100081,China

Nansen International Environmental and Remote Sensing Centre,St.Petersburg 199034,Russia

Saint Petersburg State University,St.Petersburg 199034,Russia

Antarctic Great Wall Ecology National Observation and Research Station,Polar Research Institute of China,Shanghai 201209,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaTaishan Scholars Program

422762514221153003341876212

2024

10.1007/s13131-024-2326-7

海洋学报(英文版)
中国海洋学会

海洋学报(英文版)

CSTPCD
影响因子：0.323
ISSN：0253-505X
年,卷(期)：2024.43(5)
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