Satellite Observations of the Tropical Terrestrial Carbon Balance and Interactions with the Water Cycle During the 21st Century

John Worden, Sassan Saatchi, Michael Keller, Anthony Bloom, Rong Fu, Sarah Worden, Junjie Liu, Nicholas Parazoo, Joshua B. Fisher, Helen Worden, Yi Yin, Kevin Bowman, Pierre Gentine, Alexandra G. Konings, Gregory R. Quetin, Mathew Williams, John.t. Reager, Armineh Barkhordarian, Kristen Fahy, Mingjie ShiDavid Schimel

Research output: Contribution to journalArticlepeer-review

Abstract

A constellation of satellites are now in orbit providing information about terrestrial carbon and water storage and fluxes. These combined observations show that the tropical biosphere has changed significantly in the last two decades from the combined effects of climate variability and land use. Large areas of forest have been cleared in both wet and dry forests, increasing the source of carbon to the atmosphere. Concomitantly, tropical fire emissions have declined, at least until 2016, from changes in land‐use practices and rainfall, increasing the net carbon sink. Measurements of carbon stocks and fluxes from disturbance and recovery and of vegetation photosynthesis show significant regional variability of net biosphere exchange (NBE) and gross primary productivity (GPP) across the tropics and are tied to seasonal and interannual changes in water fluxes and storage. Comparison of satellite based estimates of evapotranspiration (ET), photosynthesis, and the deuterium content of water vapor with patterns of total water storage and rainfall demonstrate the presence of vegetation‐atmosphere interactions and feedback mechanisms across tropical forests. However, these observations of stocks, fluxes and inferred interactions between them do not point unambiguously to either positive or negative feedbacks in carbon and water exchanges. These ambiguities highlight the need for assimilation of these new measurements with Earth System models for a consistent assessment of process interactions, along with focused field campaigns that integrate ground, aircraft and satellite measurements, to quantify the controlling carbon and water processes and their feedback mechanisms.
Original languageEnglish
JournalReviews of Geophysics
Early online date22 Jan 2021
DOIs
Publication statusE-pub ahead of print - 22 Jan 2021

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