Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 196, Issue -, Pages 123-133Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2017.06.037
Keywords
Transport rate; Phytoplankton biomass; High-frequency observational data; Primary production; Timescale; Open water method
Categories
Funding
- Virginia Institute of Marine Science
- Virginia Department of Environmental Quality
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Although both local processes (photosynthesis, respiration, grazing, and settling), and transport processes (advective transport and diffusive transport) significantly affect local phytoplankton dynamics, it is difficult to separate their contributions and to investigate the relative importance of each process to the local variability of phytoplanlcton biomass over different timescales. A method of using the transport rate is introduced to quantify the contribution of transport processes. By combining the time-varying transport rate and high-frequency observed chlorophyll a data, we can explicitly examine the impact of local and transport processes on phytoplankton biomass over a range of timescales from hourly to annually. For the Upper James River, results show that the relative importance of local and transport processes differs on different timescales. Local processes dominate phytoplankton variability on daily to weekly timescales, whereas the contribution of transport processes increases on seasonal to annual timescales and reaches equilibrium with local processes. With the use of the transport rate and high frequency chlorophyll a data, a method similar to the open water oxygen method for metabolism is also presented to 'estimate phytoplankton primary production. (C) 2017 Elsevier Ltd. All rights reserved.
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