Dissolved carbon dioxide and methaneIn estuaries and waters surroundingMangroves on the east coast of indiaAnd the andaman islands

Abstract

This study reconsiders our current understanding of CO2 and CH4 newlineemissions from coastal margins especially from estuaries and mangroves newlinesurrounding waters Though coastal areas occupy lesser surface area when newlinecompared to the oceans their contribution to greenhouse gas emissions are newlinesignificantly higher Due to the intense biogeochemical transformations that newlinetake place in coastal zones these regions play an important role in the cycling newlineof carbon and emissions of important greenhouse gases Most of our newlineunderstanding of coastal biogeochemical processes is from studies in newlinetemperate areas and very few targeted studies have been carried out to date in newlinetropical zones The higher temperature in the tropics would suggest newlinesignificant atmospheric fluxes from the tropical coastal ecosystems CO2 and newlineCH4 concentrations and fluxes in three different mangrove Andaman newlineSundarbans and Pichavaram ecosystems and two different estuarine newlineHooghly and Adyar zones on the east coast of India and the Andaman newlineIslands were estimated The study sites were chosen based on the different newlineenvironmental settings and degree of anthropogenic impact newline newline