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Observational Constraints on the Response of High‐Latitude Northern Forests to Warming

Liu, Junjie and Wennberg, P. O. and Parazoo, Nicholas C. and Yin, Yi and Frankenberg, Christian (2020) Observational Constraints on the Response of High‐Latitude Northern Forests to Warming. AGU Advances, 1 (4). Art. No. e2020AV000228. ISSN 2576-604X. https://resolver.caltech.edu/CaltechAUTHORS:20201124-131616305

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Abstract

Since the 1960s, carbon cycling in the high‐latitude northern forest (HLNF) has experienced dramatic changes: Most of the forest is greening and net carbon uptake from the atmosphere has increased. During the same time period, the CO₂ seasonal cycle amplitude (SCA) has increased by ~50% or more. Disentangling complex processes that drive these changes has been challenging. In this study, we substitute spatial sensitivity to temperature for time to quantify the impact of temperature increase on gross primary production (GPP), total ecosystem respiration (TER), the fraction of Photosynthetic Active Radiation (fPAR), and the resulted contribution of these changes in amplifying the CO₂ SCA over the HLNF since 1960s. We use the spatial heterogeneity of GPP inferred from solar‐induced chlorophyll Fluorescence in combination with net ecosystem exchange (NEE) inferred from column CO₂ observations made between 2015 and 2017 from NASA's Orbiting Carbon Observatory‐2. We find that three quarters of the spatial variations in GPP can be explained by the spatial variation in the growing season mean temperature (GSMT). The long term hindcast captures both the magnitude and spatial variability of the trends in observed fPAR. We estimate that between 1960 and 2010, the increase in GSMT enhanced both GPP and the SCA of NEE by ~20%. The calculated enhancement of NEE due to increase in GSMT contributes 56–72% of the trend in the CO₂ SCA at high latitudes, much larger than simulations by most biogeochemical models.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2020AV000228DOIArticle
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020AV000228PublisherArticle
ORCID:
AuthorORCID
Liu, Junjie0000-0002-7184-6594
Wennberg, P. O.0000-0002-6126-3854
Parazoo, Nicholas C.0000-0002-4424-7780
Yin, Yi0000-0003-4750-4997
Frankenberg, Christian0000-0002-0546-5857
Additional Information:© 2020 Jet Propulsion Laboratory. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Issue Online: 24 November 2020; Version of Record online: 24 November 2020; Manuscript accepted: 19 October 2020; Manuscript revised: 12 October 2020; Manuscript received: 01 June 2020. We thank Editor Eric Davidson, reviewer Shilong Piao, and two other anonymous reviewers for their constructive comments. We also thank James Randerson, Dave Schimel, and TRENDY modelers (Stephen Sitch, Pierre Friedlingstein, Vivek Arora, Atul Jain, Markus Kautz, Danica Lobardozzi, Sebastian Lienert, Julia Nabel, Benjamin Poulter, Nicolas Vuichard, Andy Wiltshire, and Ning Zeng) for their comments and suggestions in preparing this paper. Resources supporting this work were provided by the NASA High‐End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) division at Ames Research Center. We acknowledge the funding support from NASA Carbon Cycle Science program and OCO‐2/3 Science Team program. Part of the research was carried out at Jet Propulsion Laboratory, Caltech. Data Availability Statement: The sources of all the data used in this paper are listed in Table S1. The authors declare no conflicts of interest relevant to this study.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:OCO‐2; SIF; GPP
Issue or Number:4
Record Number:CaltechAUTHORS:20201124-131616305
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201124-131616305
Official Citation:Liu, J., Wennberg, P. O., Parazoo, N. C., Yin, Y., & Frankenberg, C. (2020). Observational constraints on the response of high‐latitude northern forests to warming. AGU Advances, 1, e2020AV000228. https://doi.org/10.1029/2020AV000228
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106815
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Nov 2020 21:38
Last Modified:24 Nov 2020 21:38

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