| CHEN Cheng,MAO Zhihua,HAN Guoqi,ZHU Qiankun,GONG Fang,WANG Tianyu. 2016. Latitudinal and interannual variations of the spring phytoplankton bloom peak in the East Asian marginal seas. Acta Oceanologica Sinica, 35(12):81－88 |
| Latitudinal and interannual variations of the spring phytoplankton bloom peak in the East Asian marginal seas |
| 东亚边缘海区浮游植物春华的纬向与年际变化 |
| Received:November 16, 2015 Revised:May 03, 2016 |
| DOI：10.1007/s13131-016-0867-0 |
| Key words:latitudinal and interannual variation spring bloom peak phytoplankton phenology East Asian marginal seas climate change |
| 中文关键词: 纬向变化与年际变化 春华峰期 浮游植物物候 东亚边缘海 气候变化 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | CHEN Cheng | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | MAO Zhihua | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | mao@sio.org.cn | | HAN Guoqi | Biological and Physical Oceanography Section, Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, Newfoundland and Labrador, Canada | | | ZHU Qiankun | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | GONG Fang | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | WANG Tianyu | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | |
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| Abstract: |
| Combined studies of latitudinal and interannual variations of annual phytoplankton bloom peak in East Asian marginal seas (17°-58°N, including the northern South China Sea (SCS), Kuroshio waters, the Sea of Japan and the Okhotsk Sea) are rarely. Based on satellite-retrieved ten-year (2003-2012) median timing of the annual Chlorophyll a concentration (Chl a) climax, here we report that this annual spring bloom peak generally delays from the SCS in January to the Okhotsk Sea in June at a rate of (21.20±2.86) km/d (decadal median±SD). Spring bloom is dominant feature of the phytoplankton annual cycle over these regions, except for the SCS which features winter bloom. The fluctuation of the annual peak timing is mainly within ±48 d departured from the decadal median peak date, therefore this period (the decadal median peak date ±48 d) is defined as annual spring bloom period. As sea surface temperature rises, earlier spring bloom peak timing but decreasing averaged Chl a biomass in the spring bloom period due to insufficient light is evident in the Okhotsk Sea from 2003 to 2012. For the rest of three study domains, there are no significant interannual variance trend of the peak timing and the averaged Chl a biomass. Furthermore this change of spring phytoplankton bloom timing and magnitude in the Okhotsk Sea challenges previous prediction that ocean warming would enhance algal productivity at high latitudes. |
| 中文摘要: |
| 针对一个比较完整的东亚大陆边缘海区，包括南海北部、日本列岛黑潮主干流区、日本海与鄂霍茨克海，其每年藻华峰期的纬向与年际变化研究非常鲜见。基于10年（2003-2012）遥感数据，论文报道每年叶绿素a浓度峰值时间约以21.20±2.86公里/天（十年中值±标准偏差）的速度从南海北部（12月-1月）向鄂霍茨克海（5月-6月）北向推进。除了南海北部的冬季藻华外，其余三个海区每年的支配性藻华事件均为春季藻华。藻华峰值时间的年际变化集中于十年中值时间的前后48天内，因此这个周期（十年中值±48天）被定义为每年的“春华”周期。从2003至2012年随着海洋表层温度上升春华峰值时间提前，但“春华”周期里平均叶绿素a浓度降低（由于不足的光照条件）的趋势在鄂霍茨克海最为显著。其余三个海区（南海北部、日本列岛黑潮主干流区与日本海）相应的年际变化趋势都不显著。论文研究结果进一步质疑了前人关于气候暖化可以促进高纬度海区藻华年生产力的判断。 |
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