Interannual Variations of Water Mass in Nordic seas

June 18, 2015·
Hengkai YAO
Hengkai YAO
Ling Du
Ling Du
Supervisor
· 0 min read
Image credit: Hengkai Yao
Abstract
In this paper, 1945–2012 years seawater temperature and salinity data analysis of the vertical structure of temperature and salinity, heat content, temperature and salinity. The results show a significant seasonal variation in the surface. 1945-1997, the presence of the upper ocean heat content significant period 181 months and a clear downward trend; in 1997-2000 Heat Content abnormal increase; since 2000, the upper heat content appear more significant decline. Wherein the heat content anomalies begin in May 1997. Through various features of time series analysis of the annual variation of the Nordic seawater, Low frequency NAO modulation may change the effects on high-frequency variations of upper heat content of annual variation of surface and subsurface temperature. It is found in the lower continually rise in global warming hiatus phenomenon, there is a clear warming trend after 2000 in mid-water, which lagged behind the NAO phase phase for about eight years. Vertical distribution of temperature and salinity show 1945-2012 Greenland basin salinity mainly negative anomaly, and Norwegian Lofoten Basin and the basin first fades and then salty trend, which is usually down to the depth of the Lofoten Basin 700m.
Type
Publication
Ocean University of China
publications
Water Mass
Hengkai YAO
Authors
Hengkai YAO (he/him)
Ocean Scientist
Dr. Hengkai Yao (姚恒恺) is a lecturer of School of Mathmetica and Physics at the Qingdao University of Science and Technology. He got Ph.D of Physical Oceanograpy from Ocean University of China. His research interests include mesoscale eddies, ocean modeling and AI oceanography. He is member of the AI Oceanography group, which develops big data in ocean, ocean simulation, and ocean prediction. He is also a chief scientist in Qingdao Oakfull Water Technology Co., Ltd.
Ling Du
Authors
Ling Du
Associate Professor of Physical Oceanography

Associate Professor, Ph. D College of Oceanic and Atmospheric Sciences Ocean University of China 238 Songling Road, Qingdao, China, 266100 Tel: +86-532-66781505 E-mail: duling@ouc.edu.cn

Research Interest: Numerical Simulation of Tide and Circulation Law and Mechanism of Sea level Variation Ocean-Atmosphere Interaction on the Climate Scale Coupled Ocean-Sea-Ice Models Sea level variation in Arctic Ocean and subarctic region

Education: 1994–1998 Marine Meteorology, Ocean University of Qingdao 2000–2005 Ph.D, Physical Oceanography, Ocean University of China

Employment: 1998–2000 State Oceanic Administration 2005–present Associate Professor, Ocean University of China

Courses: Undergraduate student curriculum: 2005.9 - 2006.1: Physical Oceanography Spring 2006 - present: Computation of Marine Hydrologic Factors

Research Projects: Response of interannual sea level variation in the East China Sea to the two types of El Niño events, NSFC general program, 2014-2017, PI Impact of the inter-annual variability of subtropical gyre in the North Pacific on the seasonal and inter-annual sea level variation in the East China Sea, NSFC general program, 2010-2012, PI Technology demonstration in China coastal area under circumstance of climate change, National Key Technology R&D Program, 2007-2010, co-PI Ocean heat storage and transformation during the Arctic sea ice retreat, in “Dynamics of Arctic amplification caused by sea ice retreat and its global effects”, Global Change Research Program of China, 2015-2019, Participant Structures, Variability and Climatic Impacts of Ocean Circulation and Warm Pool in the Tropical Pacific Ocean, National Basic Research Program of China, 2012-2016, Participant Sea level mechanism, prediction and impact assessment under climate changes, Global Change and Air-Sea Interaction Project, 2013-2016, co-PI

Publications: Du, Ling, J. Zhao, et al., 2011, Characteristics of ocean current in the Bering Strait and the Chukchi Sea in summer 2003. In: Rapid changing condition in the Arctic Ocean. Zhanhai Zhang (ed.), Science Press, Beijing. Du, Ling, Li L., Li P., Zuo J., Chen M., 2007. The Calculation of Check Water Levels in the Jiaozhou Bay and Adjacent Sea. ISOPE-2007 conference. Portugal, Lisbon, July 1-6, 2007, 2370-2376. Du, Ling, Zuo J., et al., 2005. Simulation of Tidal and Tidal Current in the Taiwan Strait by Finite Element Method. Transactions of Oceanology and Limnology. 4: 1-9. (in Chinese with English abstract) Jiang, S., Ling Du, Yiting Chang, Shouwen Zhang, 2014. Sea level variation during IOD and ENSO event in the tropical Indian Ocean. Marine Environmental Science, 33(3), 399-406. (in Chinese with English abstract) Chang, Y., Ling Du, Shou-wen Zhang, Peng-Fei Huang, 2013. Sea level variations in the tropical Pacific Ocean during two types of recent El Nino events. Global and Planetary Change, 108, 119-127. Zuo, J., Ling Du, Zhang Jianli, Chen Meixiang, 2010. Global distribution of thermosteric contribution to sea level rising trend. J. Oceano Univ. China, 9(3), 199-209. doi: 10.1007/s11802-010-1628-x. Li, L., LingD u, et al., 2005. The fundamental characteristics of current in the Bering Strait and the Chukchi Sea from July to September 2003. Acta Oceanologica Sinica, 24 (6), 1-11. Zuo, J., Ling Du, M. Chen, Q. Xu, 2013. Influence and application of Sea level changes involving the climate change. Beijing: Science Press. Book.

Copyright Registration: Du, Ling, X. Wu, F. Huang, 2011. Retrieval software for the sea ice thickness in the Ross Sea with Laser altimeter measurements. Software Copyright Registration No. 2011SR088715. Copyright owner: Ocean University of China.

Awards: Zuo, J., M. Chen, L. Du, M. Chen, Q. Xu, M. Yan, J. Zhang, L. Li, Y. Liu, L. Mou, 2012: China Sea Level Changes and Influences on Coastal Engineering Standard, Third prize of Dayu Water Science and Technology award

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