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New constraints on the Amazonian carbon balance from airborne observations of the stable isotopes of CO2

Objective

Severe droughts in Amazonia in 2005 and 2010 caused widespread loss of carbon from the terrestrial biosphere. This loss, almost twice the annual fossil fuel CO2 emissions in the EU, suggests a large sensitivity of the Amazonian carbon balance to a predicted more intense drought regime in the next decades. This is a dangerous inference though, as there is no scientific consensus on the most basic metrics of Amazonian carbon exchange: the gross primary production (GPP) and its response to moisture deficits in the soil and atmosphere. Measuring them on scales that span the whole Amazon forest was thus far impossible, but in this project I aim to deliver the first observation-based estimate of pan-Amazonian GPP and its drought induced variations.
My program builds on two recent breakthroughs in our use of stable isotopes (13C, 17O, 18O) in atmospheric CO2: (1) Our discovery that observed δ¹³C in CO2 in the atmosphere is a quantitative measure for vegetation water-use efficiency over millions of square kilometers, integrating the drought response of individual plants. (2) The possibility to precisely measure the relative ratios of 18O/16O and 17O/16O in CO2, called Δ17O. Anomalous Δ17O values are present in air coming down from the stratosphere, but this anomaly is removed upon contact of CO2 with leaf water inside plant stomata. Hence, observed Δ17O values depend directly on the magnitude of GPP. Both δ¹³C and Δ17O measurements are scarce over the Amazon-basin, and I propose more than 7000 new measurements leveraging an established aircraft monitoring program in Brazil. Quantitative interpretation of these observations will break new ground in our use of stable isotopes to understand climate variations, and is facilitated by our renowned numerical modeling system “CarbonTracker”. My program will answer two burning question in carbon cycle science today: (a) What is the magnitude of GPP in Amazonia? And (b) How does it vary over different intensities of drought?

Field of science

  • /engineering and technology/mechanical engineering/vehicle engineering/aerospace engineering/aircraft

Call for proposal

ERC-2014-CoG
See other projects for this call

Funding Scheme

ERC-COG - Consolidator Grant

Host institution

WAGENINGEN UNIVERSITY
Address
Droevendaalsesteeg 4
6708 PB Wageningen
Netherlands
Activity type
Higher or Secondary Education Establishments
EU contribution
€ 827 975

Beneficiaries (5)

WAGENINGEN UNIVERSITY
Netherlands
EU contribution
€ 827 975
Address
Droevendaalsesteeg 4
6708 PB Wageningen
Activity type
Higher or Secondary Education Establishments
UNIVERSITEIT UTRECHT
Netherlands
EU contribution
€ 296 409,38
Address
Heidelberglaan 8
3584 CS Utrecht
Activity type
Higher or Secondary Education Establishments
RIJKSUNIVERSITEIT GRONINGEN
Netherlands
EU contribution
€ 264 398,75
Address
Broerstraat 5
9712CP Groningen
Activity type
Higher or Secondary Education Establishments
UNIVERSITY OF LEEDS
United Kingdom
EU contribution
€ 68 735
Address
Woodhouse Lane
LS2 9JT Leeds
Activity type
Higher or Secondary Education Establishments
INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS
Brazil
EU contribution
€ 812 170,63
Address
Avenida Dos Astronautas 1758
12227-010 Sao Jose Dos Campos
Activity type
Research Organisations