{"title":"Assessing the Impact of Various Controlling Factors on Chlorophyll Concentration in the Arabian Sea Using Remotely Sensed Observations","authors":"","doi":"10.1007/s41208-024-00676-4","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>Present work examines a long-term trend (2003–2020) of the chlorophyll-a concentration and impact of various controlling factors on it in the Arabian Sea using robust non-parametric Man Kendall analysis, two-way ANOVA statistical test, and two-stage least square regression technique. Climatological means and interannual variations of chlorophyll-a (Chl_a) concentration and other controlling factors viz. Sea surface temperature (SST), Aerosol optical depth (AOD) and sea surface wind (SSW) have been analysed. From the seasonal variation of Chl_a and AOD it is observe that the highest Chl_a (1.4 mg/m<sup>3</sup>) is observed during July, August, September and October, and the highest AOD (0.8) is observed during June, July, August and September over the Arabian Sea. There was a two-month delay in the peak concentration of Chl_a/AOD, SSW; however, one month delay is observed in the peak concentration of Chl_a/SST in the Arabian Sea. A long-term trend of Chl_a concentration and SSW shows a decreasing trend, whereas SST and AOD show an increasing trend in the Arabian Sea. From ANOVA and two-stage least square regression it is observed that SST plays a significant role in influencing the decreasing trend of Chl_a in comparison to the other two controlling factors (AOD and SSW). A rise of 1% in SST results into a decrease of 0.138 percentage point in Chl_a concentration that is statistically significant at 1% significance level. The present work helps to understand the impact of various controlling factors on the ocean's primary productivity and the effect of climate change on the marine ecosystem.</p>","PeriodicalId":22298,"journal":{"name":"Thalassas: An International Journal of Marine Sciences","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thalassas: An International Journal of Marine Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s41208-024-00676-4","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Present work examines a long-term trend (2003–2020) of the chlorophyll-a concentration and impact of various controlling factors on it in the Arabian Sea using robust non-parametric Man Kendall analysis, two-way ANOVA statistical test, and two-stage least square regression technique. Climatological means and interannual variations of chlorophyll-a (Chl_a) concentration and other controlling factors viz. Sea surface temperature (SST), Aerosol optical depth (AOD) and sea surface wind (SSW) have been analysed. From the seasonal variation of Chl_a and AOD it is observe that the highest Chl_a (1.4 mg/m3) is observed during July, August, September and October, and the highest AOD (0.8) is observed during June, July, August and September over the Arabian Sea. There was a two-month delay in the peak concentration of Chl_a/AOD, SSW; however, one month delay is observed in the peak concentration of Chl_a/SST in the Arabian Sea. A long-term trend of Chl_a concentration and SSW shows a decreasing trend, whereas SST and AOD show an increasing trend in the Arabian Sea. From ANOVA and two-stage least square regression it is observed that SST plays a significant role in influencing the decreasing trend of Chl_a in comparison to the other two controlling factors (AOD and SSW). A rise of 1% in SST results into a decrease of 0.138 percentage point in Chl_a concentration that is statistically significant at 1% significance level. The present work helps to understand the impact of various controlling factors on the ocean's primary productivity and the effect of climate change on the marine ecosystem.
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