Long-Term Variability of Phytoplankton Primary Production in the Ulleung Basin, East Sea/Japan Sea Using Ocean Color Remote Sensing

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Dabin Lee, Dong-Hun Lee, Huitae Joo, Hyo Keun Jang, Sanghoon Park, Yejin Kim, Sungjun Kim, Jaesoon Kim, Myeongseop Kim, Jae-Il Kwon, Sang Heon Lee
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Abstract

In recent years, significant changes in environmental conditions and marine ecosystems have been observed in the East Sea/Japan Sea. This study investigates the long-term environmental dynamics and phytoplankton responses in the Ulleung Basin, situated in the southwestern East Sea/Japan Sea, utilizing satellite and in situ data from 2002 to 2021. Over this period, there was a noticeable increase in sea surface temperature (SST) (r = 0.5739, p < 0.01), accompanied by decreasing mixed layer depth (MLD) and chlorophyll-a (Chl-a) concentration (r = −0.6193 and −0.6721, respectively; p < 0.01). Nutrient concentrations within the upper 50 m significantly declined for nitrate and phosphate. A reduction in the N:P ratio indicated a shift from phosphorus-limited to nitrogen-limited environment. Moreover, primary production (PP) demonstrated a decreasing trend (r = −0.5840, p < 0.01), coinciding with an increase in small phytoplankton contribution (r = 0.6399, p < 0.01). Rising SST potentially altered the water column's vertical structure, hindering nutrient entrainment from the deep ocean. Consequently, this nutrient limitation may increase small phytoplankton contribution, resulting in a decline in total PP. Under the IPCC's SSP5-8.5 scenario, small phytoplankton contribution in the Ulleung Basin is projected to rise by over 10%, resulting in a 29% average PP decrease by 2100. This suggests a diminishing energy supply to the food web in a warming ocean, impacting higher trophic levels and major fishery resources. These findings emphasize the critical need for understanding and monitoring these environmental shifts for effective fisheries management and marine ecosystem conservation.

Abstract Image

利用海洋颜色遥感研究东海/日本海郁陵盆地浮游植物初级生产的长期变化性
近年来,东海/日本海的环境条件和海洋生态系统发生了重大变化。本研究利用 2002 年至 2021 年的卫星和现场数据,对位于东海/日本海西南部的郁陵盆地的长期环境动态和浮游植物反应进行了调查。在此期间,海面温度(SST)明显上升(r = 0.5739,p < 0.01),同时混合层深度(MLD)和叶绿素-a(Chl-a)浓度下降(r = -0.6193和-0.6721,p < 0.01)。硝酸盐和磷酸盐在上层 50 米的营养浓度明显下降。氮磷比的降低表明环境从限磷转向限氮。此外,初级生产力(PP)呈下降趋势(r = -0.5840,p < 0.01),与此同时,小型浮游植物的贡献增加(r = 0.6399,p < 0.01)。上升的 SST 可能改变了水柱的垂直结构,阻碍了来自深海的营养物质输入。因此,这种营养限制可能会增加小型浮游植物的贡献,从而导致 PP 总量的下降。根据 IPCC 的 SSP5-8.5 预测,郁陵盆地的小型浮游植物含量预计将增加 10%以上,到 2100 年,PP 平均下降 29%。这表明,在海洋变暖的情况下,食物网的能量供应将不断减少,从而影响较高营养级和主要渔业资源。这些发现强调了了解和监测这些环境变化以进行有效渔业管理和海洋生态系统保护的迫切需要。
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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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