Soil and Air Temperature Calibrations Using Branched GDGTs for the Tropical Andes of Colombia: Toward a Pan‐Tropical Calibration

Pérez‐Angel, Lina C.; Sepúlveda, Julio; Molnar, Peter; Montes, Camilo; Rajagopalan, Balaji; Snell, Kathryn; Gonzalez‐Arango, Catalina; Dildar, Nadia

doi:10.1029/2020gc008941

i

Soil and Air Temperature Calibrations Using Branched GDGTs for the Tropical Andes of Colombia: Toward a Pan‐Tropical Calibration

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2020
By Pérez‐Angel, Lina C. ; Sepúlveda, Julio ; Molnar, Peter ; ...

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Journal Title:

Geochemistry, Geophysics, Geosystems
Personal Author:

Pérez‐Angel, Lina C. ; Sepúlveda, Julio ; Molnar, Peter ; Montes, Camilo ; Rajagopalan, Balaji ; Snell, Kathryn ; Gonzalez‐Arango, Catalina ; Dildar, Nadia
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NCEI (National Centers for Environmental Information)
Description:

Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial cell membrane lipids that, when preserved in sedimentary archives, can be used to infer continental paleotemperatures. Although commonly used global calibrations capture a relationship between the distribution of brGDGTs and temperature, they underestimate temperatures for tropical regions as much as ~16°C. Furthermore,some global calibrations reach saturation at around 24 –25°C, and, in general, they have root ‐mean ‐squared errors (RMSEs ≈~4°C) that are too large for them to resolve small variations in paleoclimate variability in tropical regions. We present an in situ regional calibration of soil brGDGTs along altitudinal transects on bothﬂanks of the Eastern Cordillera of Colombia in the northern tropical Andes that spans ~3,200 m in
Keywords:

Geochemistry And Petrology Geophysics Geochemistry And Petrology Geochemistry And Petrology
Source:

Geochemistry, Geophysics, Geosystems, 21(8)
DOI:

https://doi.org/10.1029/2020gc008941
ISSN:

1525-2027 ; 1525-2027
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American Geophysical Union (AGU)
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Journal Article
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urn:sha256:4dd9e89db4aa436ddbd58b360fab4fdb4ab82cb303939f599fa9ea76fb5239fd
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https://repository.library.noaa.gov/view/noaa/54329/noaa_54329_DS1.pdf
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