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Tracking ecological shifts across the Antarctic Polar Front: A regional remote sensing model for phytoplankton size classes
编号：1116 访问权限：仅限参会人 更新：2026-08-31 22:33:16 浏览：0次 口头报告

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摘要
Accurate retrieval of phytoplankton size classes (PSCs), crucial ecological indicators of marine biogeochemical cycles, remains challenging in the highly dynamic Southern Ocean (SO) when using conventional global remote sensing models. Traditional Diagnostic Pigment Analysis (DPA) often introduces structural uncertainties due to the ambiguous mathematical partitioning of shared marker pigments. In this study, we demonstrate that a regionally optimized, taxonomically informed CHEMTAX scheme yields substantially more robust and ecologically consistent in situ PSC baselines. Building upon this foundation, we developed a novel suite of regional abundance-based PSC satellite inversion models tailored for the SO. Independent validation reveals that these models achieve high predictive accuracy relying solely on total chlorophyll-a. Notably, the framework yields highly accurate microphytoplankton estimates (MAPE=25.32%, R2=0.98) and superior improvements in nanophytoplankton retrievals (MAPE=49.94%, R2=0.63). Crucially, it effectively mitigates the severe overestimation of picophytoplankton commonly produced by global algorithms at low chlorophyll concentrations south of the Polar Front (PF). Applying these models to basin-scale satellite data significantly refines the spatial mapping of PSCs, revealing that microphytoplankton dominated, while nanophytoplankton also contributed a substantial fraction, particularly south the PF zone.  Ultimately, this accurate, satellite-based framework provides an indispensable suite of monitoring indicators for assessing the efficiency of the biological carbon pump and tracking the response of fragile SO marine ecosystems to global climate change.
 
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报告人
Yu Huan
Jiangsu Ocean University

稿件作者
Yu Huan Jiangsu Ocean University
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重要日期

  • 会议日期

    01月12日

    2027

    至

    01月15日

    2027

  • 07月21日 2026

    初稿截稿日期

  • 01月15日 2027

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University (MEL)
Department of Earth Sciences, National Natural Science Foundation of China (NSFC)
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