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Based on National Oceanic and Atmospheric Administration daily optimum interpolation sea surface temperature (SST) data set from 1982 to 2019, spatial-temporal changes in marine heat wave (MHW) (frequency, duration, intensity) in the Bohai Sea and Yellow Sea and associated circulations were analyzed using various statistical methods. Results show that: (1) there are obvious regional differences in MHW. More frequency, longer duration, more intensity MHWs are all located at the most part of the Bohai Sea and northern Yellow Sea. (2) In recent 38 years, the annual frequency, annual average duration, annual average intensity and maximum intensity of the marine heat waves in the Bohai Sea and Yellow Sea have generally increased and strengthened, together with spatial heterogeneity. The trends at the coast of the Korean Peninsula coastal show insignificant trend. (3) MHWs were classified into four levels by daily SST: moderate, strong, severe and extreme. Result shows that except extreme MHWs, there are significant geographic differences in the frequency and trend of the other three MHW levels. Moderate MHWs are more frequent and have a significant increasing trend in most part of the Bohai Sea and Yellow Sea, while strong and severe marine heat waves are mainly concentrated in the Bohai Sea. However, extreme MHW in this region was hardly occurred. (4) Regional, there were 83 MHWs occurred in the Bohai Sea and Yellow Sea during 1982 to 2019, with an average of 2.2 times per year. The frequencies of MHWs appeared seasonal variation obviously. More MHWs with different levels of intensity occurred in summer. (5) Composite analysis shows that, summer MHWs in the Bohai Sea and Yellow Sea have significant relationship with atmospheric circulation. Barotropic positive geopotential height anomalies centered on Lake Baikal were favorable for anomalous descending air motion in the lower troposphere and west-northerly winds in high troposphere, there should be more clear days and hence more MHWs during the high-solar-radiation summer period.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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