Characteristics and causes of kuroshio sea temperature changes in the East China Sea
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Author: Yi Xiangyu1 Dong Wenjie 1 Li Shaoyi 1 Li Yuan1 Xu Danya2 Wang Zhanggui2
Units: 1. School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong 519082;
2. Guangdong Provincial Laboratory of Marine Science and Engineering (Zhuhai), Zhuhai 519082, Guangdong
Class number: P731.27
Publication Year, Volume, Issue (page number): 2021.38.Issue 3 (38-51)
Abstract:Using the newly built Zhongda Thermohaline Dataset, HadISST and ICOADS month-by-month SST data, the climatic characteristics of the sea surface temperature in the key area of Kuroshio in the East China Sea were analyzed, and the SODA sea surface data was used to try to find out the characteristics and causes of sea surface temperature changes. The results show that in the key area of The East China Sea Kuroshio, the overall sea surface temperature showed a warming trend from 1981 to 2010, the warming amplution was the largest in spring and winter, and 1997 was the turning point of the SST climate anomaly from negative to positive; the analysis of SODA surface and subsurface temperature and current data showed that the increase in sea surface temperature was mainly due to the warming effect brought about by the enhancement of the advection; in addition, the key area of the shallow East Sea Kuroshio was deeper after 1997 than before 1997, 500 m The surface of the flow velocity of the mainstream area of the Shallow East Sea Kuroshio increased by about 0.6 cm/s every 10 a, the trend decreased with the increase of depth, the interannual change was more significant and consistent with the ENSO change cycle, the sea surface SST increased by about 0.2 to 0.3 °C every 10 a, and the growth rate was the largest near 100 m below the sea.
Keywords: Black Tide in the East China Sea, Ocean Warming, Sea Surface Temperature Anomaly, Climate Change, Ocean Observations, Advection
Abstract：Based on the monthly mean sea temperature dataset of the newly-built China Sea Ocean Observation database, HadlSST dataset and ICOADS, this paper analyzes the climatic characteristics of sea surface temperature in the Kuroshio area in the East China Sea from 1981 to 2010, and examine the characteristics of sea surface temperature variation and its cause using SODA. The results show that the sea surface temperature reveals an increasing trend with the maximum rate in spring and winter and with a transition point in 1997 when the sea temperature anomaly turning from negative to positive. The increase of sea surface temperature is mainly caused by the intensification of meridional advection. Moreover, the extension of sea temperature increase above the depth of 1 000 m is deeper after 1997 compared to that before 1997. The current speed in the sea surface increases 0.6 cm/s every 10 years above the depth of 500 m in the Kuroshio area in the East China Sea, which weakens with depth and shows significant interannual variation in accordance with the ENSO cycle. The sea surface temperature increases 0.2～0.3 ℃ every 10 years with the maximum rate near 100 m.
Key words：Kuroshio in the East China Sea; ocean warming; SST anomaly; climate change; ocean observation database; ocean meridional advection
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Anticipate tomorrow,
The Bohai Sea and the Yellow Sea have light waves of 0.8 to 1.3 meters to medium waves;
The East China Sea has a medium wave of 1.3 to 1.8 meters;
There are 1 to 1.5 meters of light to medium waves in the waters near the Diaoyu Islands, the ocean east of Taiwan, the Bashi Strait, and the northern part of the South China Sea;
There are light waves from 0.8 to 1.3 meters in the Taiwan Strait and the central South China Sea to medium waves;
There are light waves of 0.6 to 1 meter in the southern part of the South China Sea;
The Gulf of Tonkin has a light wave to a medium wave of 1 to 1.5 meters.
Anticipated the day after tomorrow,
There is no big wave area near the coast of our country.
Numerical forecast of waves in the northwest Pacific Ocean from August 17 to 22
Coastal travel tips for tomorrow
01 Sea conditions in coastal waters
There are light waves in the waters of Pingtan and Xiamen, but due to the influence of rain on the sea surface, it is not suitable for coastal leisure tourism activities;
Other major coastal waters in China are light waves, good sea conditions, and are suitable for coastal leisure;
Shanghai, Zhoushan, Shenzhen and the North Sea are affected by small showers on the sea, and it is recommended to bring rain gear when traveling on the coast.
China's main coastal areas include:
I. Dalian; II. Tianjin; III. Qingdao; IV. Lianyungang; V. Shanghai; VI. Zhoushan; VII. Pingtan; VIII. Xiamen; IX. Shenzhen; X. Beihai; XI. Haikou; XII. Sanya.
02 Sea conditions on major routes
The main tourist routes in China are light waves, which are very suitable for boat travel;
However, except for the Dalian-Yantai route, other major tourist routes will be affected by small showers, and sea boat tourism will be slightly affected.
China's main travel routes include:
(1) Dalian- Yantai; (2) Shanghai-Putuoshan; (3) Haikou-Beihai; (4) Xiamen-Kinmen; (5) Shenzhen-Zhuhai; (6) Haikou-Hai'an; (7) Sanya-Xisha North Reef Route.
There are five levels of boat comfort:
Class 1: Excellent sea conditions, very suitable for boat trips;
Level II: Excellent sea surface conditions for boat trips;
Class III: The sea is in good condition and is more suitable for boat travel;
Level 4: The sea surface is in poor condition, and it is basically suitable for boat travel;
Level 5: The surge is too large to travel by boat.
03 Sea conditions in the beautiful island sea
There are light waves in the waters near Dongtou Island and Nanji Island, but the sea surface visual range is only 2 kilometers, which is more suitable for boat travel;
The seas around the beautiful islands in China are all light waves, and the sea conditions are good, which is very suitable for boat trips and islands.
Beautiful Islands refers to the following 35 islands:
Juehua Island, Changshan Islands, Bodhi Island, Changdao Island, Liugong Island, Lingshan Island, Qinshan Island, Liandao Island, Chongming Island, Shengsi Archipelago, Daishan Island, Dongji Island, Putuo Mountain, Dachen Island, Yuhuan Island, Dongtou Island, Nanji Island, Chengshan Island, Sandu Island, Pingtan Island, Meizhou Island, Dongshan Island, Diaoyu Island, Nan'ao Island, Wanshan Island, Chuanshan Island, Hailing Island, South Three Islands, Donghai Island, Weizhou Island, Demarcation Island, Wuzhizhou Island, Yongxing Island, Huangyan Island, Yongxia Reef.