Sunlight mediated seasonality in canopy structure and photosynthetic activity of Amazonian rainforests Public Deposited

http://ir.library.oregonstate.edu/concern/articles/w66345444

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by IOP Publishing Ltd. and can be found at:  http://iopscience.iop.org/1748-9326

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Resolving the debate surrounding the nature and controls of seasonal variation in the structure and metabolism of Amazonian rainforests is critical to understanding their response to climate change. In situ studies have observed higher photosynthetic and evapotranspiration rates, increased litterfall and leaf flushing during the Sunlight-rich dry season. Satellite data also indicated higher greenness level, a proven surrogate of photosynthetic carbon fixation, and leaf area during the dry season relative to the wet season. Some recent reports suggest that rainforests display no seasonal variations and the previous results were satellite measurement artefacts. Therefore, here we re-examine several years of data from three sensors on two satellites under a range of sun positions and satellite measurement geometries and document robust evidence for a seasonal cycle in structure and greenness of wet equatorial Amazonian rainforests. This seasonal cycle is concordant with independent observations of solar radiation. Weattribute alternative conclusions to an incomplete study of the seasonal cycle, i. e. the dry season only, and to prognostications based on a biased radiative transfer model. Consequently, evidence of dry season greening in geometry corrected satellite data was ignored and the absence of evidence for seasonal variation in lidar data due to noisy and saturated signals was misinterpreted as evidence of the absence of changes during the dry season. Our results, grounded in the physics of radiative transfer, buttress previous reports of dry season increases in leaf flushing, litterfall, photosynthesis and evapotranspiration in well-hydrated Amazonian rainforests.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Bi, J., Knyazikhin, Y., Choi, S., Park, T., Barichivich, J., Ciais, P., ... & Myneni, R. B. (2015). Sunlight mediated seasonality in canopy structure and photosynthetic activity of Amazonian rainforests. Environmental Research Letters, 10(6), 064014. doi:10.1088/1748-9326/10/6/064014
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2015-08-25T18:23:05Z (GMT). No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) HilkerThomasForestrySunlightMediatedSeasonality.pdf: 1241635 bytes, checksum: be0473ff2a4caac7a3186966ed017faa (MD5) HilkerThomasForestrySunlightMediatedSeasonalitySupplementaryInfo.pdf: 8836780 bytes, checksum: b13a98b93a9cc1799e0ce1aadeee852f (MD5) Previous issue date: 2015-06
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-08-25T18:22:26Z No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) HilkerThomasForestrySunlightMediatedSeasonality.pdf: 1241635 bytes, checksum: be0473ff2a4caac7a3186966ed017faa (MD5) HilkerThomasForestrySunlightMediatedSeasonalitySupplementaryInfo.pdf: 8836780 bytes, checksum: b13a98b93a9cc1799e0ce1aadeee852f (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-08-25T18:23:05Z (GMT) No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) HilkerThomasForestrySunlightMediatedSeasonality.pdf: 1241635 bytes, checksum: be0473ff2a4caac7a3186966ed017faa (MD5) HilkerThomasForestrySunlightMediatedSeasonalitySupplementaryInfo.pdf: 8836780 bytes, checksum: b13a98b93a9cc1799e0ce1aadeee852f (MD5)

Relationships

In Administrative Set:
Last modified: 07/27/2017 Default
Citations:

EndNote | Zotero | Mendeley

Items