The temporal dynamics of terrestrial organic matter transfer to the oceans : initial assessment and application

Drenzek, Nicholas J.

doi:10.1575/1912/1736

Cited by 13 publications

(22 citation statements)

References 184 publications

(279 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is also evident that the terrestrial organic matter buried in marine sediments is a mixture from different carbon pools that come from different reservoirs (e.g. Drenzek, 2007). The results of this study reveal an increasing age offset between long-chain fatty acid ages and planktonic foraminifera ages starting at ~5,000 yr BP.…”

Section: Storage Time Vs Availability Of Aged Carbonmentioning

confidence: 59%

“…Possible contamination derived from sample preparations steps before combustion have been recognized to be significant when measuring C samples smaller than 100 pgC (Drenzek 2007;Santos et al 2010). This contamination can derive from carbon in the lab environment, or from sample preparatory techniques like gas chromatography that via column bleed or carry over from previous injections can introduce external carbon into the sample.…”

Section: Compound Specific A1 4 C Analysismentioning

confidence: 99%

“…In this context, it is important to bear in mind that even at the molecular level, mixed (age) populations of a source-specific biomarker compound are encountered in sedimentary environment as a consequence of the multiple storage points and transport routes (see Figure 1). Therefore, the measured 4C age for a specific biomarker is a composite of these different populations (e.g., fatty acids from fresh leaf litter vs. from soils; Drenzek, 2007). Consequently, observed changes in apparent age of long-chain fatty acids could reflect changes in the overall storage/residence time of these compounds or changes in the proportions of fresh vs. pre-aged (soil) fractions.…”

Section: Sedimentation Ratesmentioning

confidence: 99%

“…Drenzek, 2007;; Hedges and Oades, 1997; Gustafsson et al, 2011). Table 2 also provides information on the percent of 50000 yr old carbon required to yield the observed age offsets.…”

Section: Implications Of Mixing Fresh Biospheric Carbon With Aged Carbonmentioning

confidence: 99%

See 3 more Smart Citations

Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations

Ponton¹

2012

View full text Add to dashboard Cite

The Indian monsoon affects the livelihood of over one billion people. Despite the importance of climate to society, knowledge of long-term monsoon variability is limited. This thesis provides Holocene records of monsoon variability, using sediment cores from river-dominated margins of the Bay of Bengal (off the Godavari River) and the Arabian Sea (off the Indus River). Carbon isotopes of terrestrial plant leaf waxes (6 13 Cwax) preserved in sediment provide integrated and regionally extensive records of flora for both sites. For the Godavari River basin the 61 3 Cwax record shows a gradual increase in aridity-adapted vegetation from ~4,000 until 1,700 years ago followed by the persistence of aridity-adapted plants to the present. The oxygen isotopic composition of planktonic foraminifera from this site indicates drought-prone conditions began as early as -3,000 years BP. The aridity record also allowed examination of relationships between hydroclimate and terrestrial carbon discharge to the ocean. Comparison of radiocarbon measurements of sedimentary plant waxes with planktonic foraminifera reveal increasing age offsets starting -4,000 yrs BP, suggesting that increased aridity slows carbon cycling and/or transport rates. At the second site, a seismic survey of the Indus River subaqueous delta describes the morphology and Holocene sedimentation of the Pakistani shelf and identified suitable coring locations for paleoclimate reconstructions. The 6 3 Cwax record shows a stable arid climate over the dry regions of the Indus plain and a terrestrial biome dominated by C 4 vegetation for the last 6,000 years. As the climate became more arid 4,000 years, sedentary agriculture took hold in central and south India while the urban Harappan civilization collapsed in the already arid Indus basin. This thesis integrates marine and continental records to create regionally extensive paleoenvironmental reconstructions that have implications for landscape evolution, sedimentation, the terrestrial organic carbon cycle, and prehistoric human civilizations in the Indian subcontinent. 3 4A mi Tito y mi Sense, por haberme despertado el interes por la Ciencia. 5Creo muy poco en lo que veo. Y de lo que me cuentan... nada.-Juan Siyago 6 Acknowledgements I am indebted to my Advisors for their unconditional support and generosity with their ideas and their time. Thank you for keeping me afloat when the seas were rough and I had started to drown. I learned that persistence is key and Science is humbling. Through this journey Liviu's tenacity and strong guidance, and Tim's enthusiasm and optimistic outlook delivered me safely to shore.I will like to thank my committee members and Chair for their invaluable contributions to improve this thesis, but most importantly for their continuous support, concern and encouragement through out these years. Delia, for always being my advocate and offering your experience to suggest alternative solutions. Valier, I have learned immensely from you in the lab and our discussions have always been frui...

show abstract

Section: Storage Time Vs Availability Of Aged Carbonmentioning

confidence: 59%

Section: Compound Specific A1 4 C Analysismentioning

confidence: 99%

Section: Sedimentation Ratesmentioning

confidence: 99%

“…Drenzek, 2007;; Hedges and Oades, 1997; Gustafsson et al, 2011). Table 2 also provides information on the percent of 50000 yr old carbon required to yield the observed age offsets.…”

Section: Implications Of Mixing Fresh Biospheric Carbon With Aged Carbonmentioning

confidence: 99%

See 2 more Smart Citations

Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations

Ponton¹

2012

View full text Add to dashboard Cite

show abstract

“…For these simulations, we assume that overall plant-wax age distribution (A) is bimodal, with a decadal (D) and a millennial (M) age component (Drenzek, 2007). A is a linear combination of these two components:…”

mentioning

confidence: 99%

Pre-aged plant waxes in tropical lake sediments and their influence on the chronology of molecular paleoclimate proxy records

Douglas

Pagani

Eglinton

et al. 2014

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Age of riverine carbon suggests rapid export of terrestrial primary production in tropics

Martin

Ingalls

Richey

et al. 2013

Geophysical Research Letters

View full text Add to dashboard Cite

The balance between the storage of vascular plant carbon in soils, oxidation to carbon dioxide, and export via rivers affects calculations of the strength of terrestrial ecosystems as carbon sinks. The magnitude and timescale of the riverine export pathway are not well constrained. Here we use radiocarbon dating of lignin phenols to show that plant‐derived carbon carried by suspended sediment of the Mekong River is very young, having been produced within the last 18 years. Further, this plant‐derived carbon remains young during times of the year when bulk carbon varies from modern to over 3000 radiocarbon years old. Our results demonstrate that primary‐production derivatives are exported rapidly and suggest that the age of riverine lignin is similar to estimates of the residence time of terrestrial organic carbon in tropical catchments. These results are relevant for modeling predictions of the influence of the terrestrial biosphere on atmospheric carbon dioxide levels.

show abstract

The temporal dynamics of terrestrial organic matter transfer to the oceans : initial assessment and application

Cited by 13 publications

References 184 publications

Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations

Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations

Pre-aged plant waxes in tropical lake sediments and their influence on the chronology of molecular paleoclimate proxy records

Age of riverine carbon suggests rapid export of terrestrial primary production in tropics

Contact Info

Product

Resources

About