Abstract Title

Analysis of fluctuation in algal communities and temperature throughout the Holocene in Sluice Pond, MA through Spectroscopy of a lake sediment core

Abstract

Sluice Pond (Lynn, MA, USA), has experienced fluctuations in algal communities and temperature. Throughout the Holocene, based on measurements from a sediment core raised from its anoxic central basin, changes in these proxies related to properties can be depicted. The variability in the core’s composition can be studied using wavelet analysis of Visible Derivative Spectroscopy signals extracted by varimax-rotated, principal component analysis (VPCA). This information is plotted against time using an AMS 14C constrained age model. The temporal history provides insight into the extent of preserved natural and human events. Thirteen separate constituents were present in the core, as mixtures of six different orthogonal (or independent) VPCA components that account for 97.1% of the variance in the data set. A detailed look at two of the components is presented in this project. They were plotted against the age model to show changes in relative concentration of 6VPCA1 showing algal blooms and turbidity (related to: Chlorite, Smectite, and phycocyanin), and 6VPCA4 used to indicate temperature (related to: Hematite and Goethite). The components oscillate with dominant periods of 4 ka and 7 ka, respectively. Major climate events such as the Younger Dryas and the 8.2-kiloyear event are represented in the data and in the past 200 years, the data shows fluctuations increasing dramatically. The data and methods used in this project give a representation of the natural variance over the Holocene and forms timelines that allow for a better understanding for the past and reference for the future.

Modified Abstract

A core raised from Sluice Pond (Lynn, MA, USA), depicts changes throughout the Holocene in both algal communities and temperature. The variability in the core was studied using wavelet analysis of Visible Derivative Spectroscopy signals extracted by varimax-rotated, principal component analysis (VPCA). This information is plotted against time using an AMS 14C constrained age model. Thirteen separate constituents were present in the core, as mixtures of six different orthogonal (or independent) VPCA components that account for 97.1% of the variance in the data set. Two of the components are presented in this project 6VPCA1 showing algal communities (related to: Chlorite, Smectite, and phycocyanin) and 6VPCA4 indicating temperature (related to: Hematite and Goethite) with dominant periods of oscillation at 4 ka and 7 ka, respectively.

Research Category

Geology/Geography

Primary Author's Major

Geology

Mentor #1 Information

Dr. Joseph

Ortiz

Presentation Format

Poster

Start Date

April 2019

Research Area

Physical Sciences and Mathematics

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Apr 9th, 1:00 PM

Analysis of fluctuation in algal communities and temperature throughout the Holocene in Sluice Pond, MA through Spectroscopy of a lake sediment core

Sluice Pond (Lynn, MA, USA), has experienced fluctuations in algal communities and temperature. Throughout the Holocene, based on measurements from a sediment core raised from its anoxic central basin, changes in these proxies related to properties can be depicted. The variability in the core’s composition can be studied using wavelet analysis of Visible Derivative Spectroscopy signals extracted by varimax-rotated, principal component analysis (VPCA). This information is plotted against time using an AMS 14C constrained age model. The temporal history provides insight into the extent of preserved natural and human events. Thirteen separate constituents were present in the core, as mixtures of six different orthogonal (or independent) VPCA components that account for 97.1% of the variance in the data set. A detailed look at two of the components is presented in this project. They were plotted against the age model to show changes in relative concentration of 6VPCA1 showing algal blooms and turbidity (related to: Chlorite, Smectite, and phycocyanin), and 6VPCA4 used to indicate temperature (related to: Hematite and Goethite). The components oscillate with dominant periods of 4 ka and 7 ka, respectively. Major climate events such as the Younger Dryas and the 8.2-kiloyear event are represented in the data and in the past 200 years, the data shows fluctuations increasing dramatically. The data and methods used in this project give a representation of the natural variance over the Holocene and forms timelines that allow for a better understanding for the past and reference for the future.