More Than Half of World Oceans Have Changed Colour, Know its Reason

More than 56 percent of the world’s oceans have experienced major changes in the past two decades. The reason for this could be climate change caused by human causes. The size of these seas is larger than the total land on Earth. The color of the ocean indicates the life and materials in its waters. In regions near the equator this color is more green at times. This is revealing changes in the ecosystem under the surface of the oceans.

Researchers from America’s Massachusetts Institute of Technology (MIT) in the journal Nature published It is written in their paper that this change in color is less visible to the human eye and cannot be explained as a year-to-year difference. Researchers have reported that regions near the equator have become greener over time. The green color of sea water comes from the green pigment chlorophyll present in large quantities in plants, such as microbes, in the upper ocean. For this reason, scientists want to monitor it in their efforts to combat climate change.

However, the researchers involved in this study have shown through some previous studies that it will take about 30 years of monitoring chlorophyll before climate change trends are visible. Earlier, another study co-authored by Stephanie Dutkiewicz and her colleagues had shown that monitoring other ocean colors with much smaller annual variations than chlorophyll could provide more clear signals of changes caused by climate change and over a period of about 20 years. May take place.

BB Cael, the lead author of this study, and his team have analyzed all seven colors of the ocean recorded through satellite in the last 20 years. Initially, the natural change in colors in a year was studied. After this, the annual changes in these over two decades were observed. Dutkiewicz’s nearly four-year-old model was used to understand the contribution of climate change to these changes. In this, the oceans are analyzed with and without greenhouse gases.