{"id":6998,"date":"2025-02-04T16:26:50","date_gmt":"2025-02-05T00:26:50","guid":{"rendered":"https:\/\/dornsife.usc.edu\/spatial\/?page_id=6998"},"modified":"2025-02-04T16:26:50","modified_gmt":"2025-02-05T00:26:50","slug":"multi-year-trends-in-chlorophyll-a-and-sea-surface-salinity","status":"publish","type":"page","link":"https:\/\/dornsife.usc.edu\/spatial\/los-angeles-geospatial-summit-2025\/multi-year-trends-in-chlorophyll-a-and-sea-surface-salinity\/","title":{"rendered":"Multi-Year Trends in Chlorophyll-a and Sea Surface Salinity"},"content":{"rendered":"\n\n\n\n\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p><strong>Presenters:<\/strong><br \/>\n<span data-sheets-root=\"1\">Jacob Spier<\/span><br \/>\n<span data-sheets-root=\"1\">Swany Cuc<\/span><\/p>\n<p><strong>California State University, Northridge<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><span data-sheets-root=\"1\">This study examines the multiyear trends in Chlorophyll-a concentrations and Sea Surface Salinity (SSS) in the coastal region of the Mississippi River using satellite-derived data from 2012-2022. Monthly median values of SSS and chlorophyll-a were calculated from 25 measurement locations to analyze temporal patterns and relationships between these variables. Seasonal Auto-Regressive Integrated Moving Average with Exogenous Variables (SARIMAX) model was used to quantify the influence of SSS on chlorophyll-a and for forecasting future values. Monthly boxplots and time series decomposition highlighted distinct seasonal trends in chlorophyll-a and SSS, with consistent monthly variations observed over the study period. Sea surface salinity as an external regressor demonstrated a significant negative relationship, with each unit increase in SSS corresponding to a decrease in chlorophyll-a levels by 0.0436 (p&lt;0.01). Residual diagnostics confirmed the model effectively accounted for temporal autocorrelation.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><a class=\"cta-link\" href=\"https:\/\/arcg.is\/0GvHGG1\" target=\"_blank\" rel=\"noopener\">View the StoryMap<\/a><\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n\n\n\n          \n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--link-list \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--link-list\"\n    \n      >\n\n    \n      <div class=\"header-container\">\n\n                  \n<div class=\"f--field f--section-title\">\n\n    \n  <h2>\n          2025 LA Geospatial Summit\n      <\/h2>\n\n\n<\/div>\n                <\/div>\n  \n      <div class=\"links-container\">\n\n                        \n        \n          \n            <div class=\"column\">\n                <ul>\n                                                                  <li>\n                                \n<div class=\"f--field f--link\">\n\n    \n    \n  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xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" viewBox=\"0 0 35 35\" enable-background=\"new 0 0 35 35\" width=\"25\" height=\"25\" xml:space=\"preserve\"><polygon fill-rule=\"evenodd\" clip-rule=\"evenodd\" fill=\"#000\" points=\"19.3,27.5 29.3,17.5,19.3,7.5 16.3,10.4 21.4,15.4 6.7,15.4 6.7,19.6 21.4,19.6 16.3,24.6 \"\/><\/svg>\n<\/a>\n\n\n<\/div>\n\n                                                    <\/li>\n                                                                                        <li>\n                                \n<div class=\"f--field f--link\">\n\n    \n    \n  \n<a \n  class=\"link\"\n  href= https:\/\/dornsife.usc.edu\/spatial\/los-angeles-geospatial-summit-2025\/sponsors\/\n    aria-label=\"Read more about Sponsors\"  \n>\n    Sponsors \n  <svg version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" viewBox=\"0 0 35 35\" 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