Global ocean colour trends in biogeochemical provinces

Frontiers in Marine Science

Marine Science

Hajo Krasemann¹  Marit van Oostende¹  Martin Hieronymi¹  Burkard Baschek² 

[1] Department of Optical Oceanography, Institute of Carbon Cycles, Helmholtz-Zentrum Hereon, Geesthacht, Germany;Deutsches Meeresmuseum, Stralsund, Germany;

关键词: ocean colour;    essential climate variables;    climate research;    climate change initiative;    satellite remote sensing;    time series;    temporal gap detection method;   

DOI  :  10.3389/fmars.2023.1052166

 received in 2022-09-23, accepted in 2023-04-18,  发布年份 2023

来源: Frontiers

【 摘 要 】

Satellite-derived ocean colour data provide continuous, daily measurements of global waters and are an essential tool for monitoring these waters in a changing climate. Merging observations from different satellite sensors is necessary for long-term and continuous climate research because the lifetime of these sensors is limited. A key issue in deriving long-term trends from merged ocean colour data is the inconsistency between the spatiotemporal coverage of the different sensor datasets that can lead to spurious multi-year fluctuations or trends in the time series. This study used the merged ocean colour satellite dataset produced by the Ocean Colour Climate Change Initiative (OC-CCI version 6.0) to infer global and local trends in optically active constituents. We applied a novel correction method to the OC-CCI dataset that results in a spatiotemporally consistent dataset, allowing the examination of long-term trends of optically active constituents with greater accuracy. We included sea surface temperature, salinity, and several climate oscillations in our analysis to gain insight into the underlying processes of derived trends. Our results indicate a significant increase in chlorophyll-a concentration in the polar waters, a decrease in chlorophyll-a concentration in some equatorial waters, and point to ocean darkening, predominantly in the polar waters, due to an increase in non-phytoplankton absorption. This study contributes to broader knowledge of global trends of optically active constituents and their relation to a changing environment.

【 授权许可】

Unknown   
Copyright © 2023 van Oostende, Hieronymi, Krasemann and Baschek