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The Impact of Lagrangian Environment...

Zaiss, Jessica,

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The Impact of Lagrangian Environmental Variability on the Growth of Phytoplankton /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The Impact of Lagrangian Environmental Variability on the Growth of Phytoplankton // Jessica Zaiss.
作者:	Zaiss, Jessica,
面頁冊數:	1 electronic resource (180 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
Contained By:	Dissertations Abstracts International86-04B.
標題:	Biological oceanography. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31564725
ISBN:	9798384471738

The Impact of Lagrangian Environmental Variability on the Growth of Phytoplankton /
Zaiss, Jessica,

The Impact of Lagrangian Environmental Variability on the Growth of Phytoplankton /Jessica Zaiss. - 1 electronic resource (180 pages)

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

Phytoplankton are vital to the global carbon cycle, contributing half of the world's photosynthesis. This process removes carbon dioxide from the atmosphere, helping regulate Earth's climate. However, large-scale climate models struggle to represent phytoplankton dynamics due to their coarse spatial resolution (~10-150km) which smooths spatial variability. Smoothing spatial variability overlooks the nonlinear response of phytoplankton growth and biomass accumulation rates to environmental changes. This dissertation investigates the critical bio-physical interactions that occur in the ocean that govern the growth of phytoplankton and resulting biomass accumulation. I focus on the timescales ranging from hourly to seasonal dynamics and spatial scales ranging from 1km to the entire Southern Ocean. To accurately determine the bio-physical response to environmental fluctuations, it is essential to adopt the phytoplankton's reference frame. As phytoplankton are largely passive drifters, they experience environmental variability in the "along-flow" reference frame (Lagrangian reference frame), which is distinctly different from the fixed-point, Eulerian reference frame. Using a combination of Lagrangian based methods and biogeochemical models, I quantify how phytoplankton growth and biomass accumulation respond to varying rates and magnitudes of temperature changes over hours to seasons. I also unravel the complex interactions between advection/diffusion and biomass accumulation at small scales (hourly, ~1km). I show that moderate temperature changes (3-6 oC) within 7-21 days cause lasting decreases in community growth rates, a phenomenon not captured by typical, large-scale model, growth dynamics. Furthermore, resolving fine-scale physics reveals that biomass accumulation is driven by a complex interplay between mixing and non-linear growth dynamics. These findings challenge existing hypotheses on biomass accumulation and highlight the intricate dynamics governing phytoplankton populations. This improved understanding provides a basis for refining large-scale models, ultimately enabling more accurate predictions of the ocean's role in the global carbon cycle and climate regulation.

English

ISBN: 9798384471738Subjects--Topical Terms:

2122748
Biological oceanography.
Subjects--Index Terms:

Biophysical interactions

The Impact of Lagrangian Environmental Variability on the Growth of Phytoplankton /
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520 $a Phytoplankton are vital to the global carbon cycle, contributing half of the world's photosynthesis. This process removes carbon dioxide from the atmosphere, helping regulate Earth's climate. However, large-scale climate models struggle to represent phytoplankton dynamics due to their coarse spatial resolution (~10-150km) which smooths spatial variability. Smoothing spatial variability overlooks the nonlinear response of phytoplankton growth and biomass accumulation rates to environmental changes. This dissertation investigates the critical bio-physical interactions that occur in the ocean that govern the growth of phytoplankton and resulting biomass accumulation. I focus on the timescales ranging from hourly to seasonal dynamics and spatial scales ranging from 1km to the entire Southern Ocean. To accurately determine the bio-physical response to environmental fluctuations, it is essential to adopt the phytoplankton's reference frame. As phytoplankton are largely passive drifters, they experience environmental variability in the "along-flow" reference frame (Lagrangian reference frame), which is distinctly different from the fixed-point, Eulerian reference frame. Using a combination of Lagrangian based methods and biogeochemical models, I quantify how phytoplankton growth and biomass accumulation respond to varying rates and magnitudes of temperature changes over hours to seasons. I also unravel the complex interactions between advection/diffusion and biomass accumulation at small scales (hourly, ~1km). I show that moderate temperature changes (3-6 oC) within 7-21 days cause lasting decreases in community growth rates, a phenomenon not captured by typical, large-scale model, growth dynamics. Furthermore, resolving fine-scale physics reveals that biomass accumulation is driven by a complex interplay between mixing and non-linear growth dynamics. These findings challenge existing hypotheses on biomass accumulation and highlight the intricate dynamics governing phytoplankton populations. This improved understanding provides a basis for refining large-scale models, ultimately enabling more accurate predictions of the ocean's role in the global carbon cycle and climate regulation.
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650 4 $a Physical oceanography. $3 3168433
650 4 $a Biophysics. $3 518360
653 $a Biophysical interactions
653 $a Environmental variability
653 $a Lagrangian analysis
653 $a Phytoplankton
653 $a Submesoscale
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