What does leaf wax δD from a mixed C3/C4 vegetation region tell us?

Wang, Yiming V.; Larsen, Thomas; Leduc, Guillaume; Andersen, Nils; Blanz, Thomas; Schneider, Robert

doi:10.1016/j.gca.2012.10.016

Cited by 73 publications

(72 citation statements)

References 56 publications

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“…This is in agreement with more recent results from Just et al (2014) on core GeoB9307-3 and Wang et al (2013) on core GIK16160-3, further away from the actual river mouth; both studies also showed an increased riverine terrestrial input during H1 and the YD. To summarize, during H1 and the YD, the Zambezi catchment is characterized by higher precipitation and enhanced riverine runoff due to a southward shift in the ITCZ resulting from Northern Hemisphere cold events, whereas during the Holocene drier conditions prevailed (Schefuß et al, 2011;Wang et al, 2013;van der Lubbe et al, 2014;Weldeab et al, 2014). The Last Glacial Maximum (LGM) in the Zambezi catchment is also recognized as an extremely wet period (Wang et al, 2013).…”

Section: Mozambique Margin and Zambezi Riversupporting

confidence: 92%

“…To summarize, during H1 and the YD, the Zambezi catchment is characterized by higher precipitation and enhanced riverine runoff due to a southward shift in the ITCZ resulting from Northern Hemisphere cold events, whereas during the Holocene drier conditions prevailed (Schefuß et al, 2011;Wang et al, 2013;van der Lubbe et al, 2014;Weldeab et al, 2014). The Last Glacial Maximum (LGM) in the Zambezi catchment is also recognized as an extremely wet period (Wang et al, 2013).…”

Section: Mozambique Margin and Zambezi Rivermentioning

confidence: 99%

“…The #rings tetra of the brGDGTs (Fig. S1c) is constant from 24 to 15 ka (0.37 ± 0.05), then shows lower values from 15 to 7 ka (0.29 ± 0.04), and, finally, increases again during the late (Kasper et al, 2015) and F C32 1,15 tracing riverine input; (b) Red Sea level changes (Grant et al, 2013); (c) log(Ca / Ti) indicating terrestrial input (van der Lubbe et al, 2014); (d) reconstruction of δD precipitation based on leaf wax n-C 29 alkane of core GIK16160-3 (Wang et al, 2013), and (e) ε Nd signatures of the clay fraction document changes in riverine influence (van der Lubbe et al, 2016). The grey bars show the YD, H1, and Heinrich Event 4 (H4).…”

Section: Holocene and Late Quaternary Sediments Of The Mozambique Chamentioning

confidence: 99%

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The C<sub>32</sub> alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

et al. 2017

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Abstract. The study of past sedimentary records from coastal margins allows us to reconstruct variations in terrestrial input into the marine realm and to gain insight into continental climatic variability. There are numerous organic proxies for tracing terrestrial input into marine environments but none that strictly reflect the input of river-produced organic matter. Here, we test the fractional abundance of the C 32 alkane 1,15-diol relative to all 1,13-and 1,15-long-chain diols (F C32 1,15 ) as a tracer of input of river-produced organic matter in the marine realm in surface and Quaternary (0-45 ka) sediments on the shelf off the Zambezi and nearby smaller rivers in the Mozambique Channel (western Indian Ocean). A Quaternary (0-22 ka) sediment record off the Nile River mouth in the eastern Mediterranean was also studied for long-chain diols. For the Mozambique Channel, surface sediments of sites most proximal to Mozambique rivers showed the highest F 1,15−C32 (up to 10 %). The sedimentary record shows high (15-35 %) pre-Holocene F 1,15−C32 and low (< 10 %) Holocene F 1,15−C32 values, with a major decrease between 18 and 12 ka. F 1,15−C32 is significantly correlated (r 2 = 0.83, p < 0.001) with the branched and isoprenoid tetraether (BIT) index, a proxy for the input of soil and riverproduced organic matter in the marine environment, which declines from 0.25 to 0.60 for the pre-Holocene to < 0.10 for the Holocene. This decrease in both F C32 1,15 and the BIT is interpreted to be mainly due to rising sea level, which caused the Zambezi River mouth to become more distal to our study site, thereby decreasing riverine input at the core location. Some small discrepancies are observed between the records of the BIT index and F C32 1,15 for Heinrich Event 1 (H1) and the Younger Dryas (YD), which may be explained by a change in soil sources in the catchment area rather than a change in river influx. Like for the Mozambique Channel, a significant correlation between F C32 1,15 and the BIT index (r 2 = 0.38, p < 0.001) is observed for the eastern Mediterranean Nile record. Here also, the BIT index and F C32 1,15 are lower in the Holocene than in the pre-Holocene, which is likely due to the sea level rise. In general, the differences between the BIT index and F C32 1,15 eastern Mediterranean Nile records can be explained by the fact that the BIT index is not only affected by riverine runoff but also by vegetation cover with increasing cover leading to lower soil erosion. Our results confirm that F C32 1,15 is a complementary proxy for tracing riverine input of organic matter into marine shelf settings, and, in comparison with other proxies, it seems not to be affected by soil and vegetation changes in the catchment area.

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Section: Mozambique Margin and Zambezi Riversupporting

confidence: 92%

Section: Mozambique Margin and Zambezi Rivermentioning

confidence: 99%

Section: Holocene and Late Quaternary Sediments Of The Mozambique Chamentioning

confidence: 99%

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The C<sub>32</sub> alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

et al. 2017

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“…The reconstructed intervals of enhanced Zambezi discharge are in agreement with the δD rainfall record obtained from a parallel core (GIK16160-30; Wang et al, 2013) after correction for the C 3 -C 4 vegetation abundances.…”

Section: Agulhas Current Links With Southern African Climates and Raisupporting

confidence: 79%

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Hall¹,

Hemming²,

LeVay³

et al. 2016

International Ocean Discovery Program Preliminary Report

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“…Combined with the 444 absence of any correlation between δ 13 C C31 -δ 13 C C33 and δ 13 C TOC and their relatively high δ 13 C 445 throughout the record, we that infer the patterns in the C 31 and C 33 leaf wax signals probably reflect 446 time-varying contributions from both wetland and terrestrial plant waxes. This would render their 447 proxy environmental signal ambiguous, which may have implications for studies in comparable 448 settings (Wang et al 2013). This needs to be tested further, particularly through the analysis of n-449 alkane distributions and δ 13 C from modern salt-marsh sediments and vegetation, perhaps in 450 conjunction with analysis of δD as a means to assess differences in source waters.…”

Section: Baxter (2001) Argued That In the Verlorenvlei System (Meadowmentioning

confidence: 99%

Holocene sea level and environmental change on the west coast of South Africa: evidence from plant biomarkers, stable isotopes and pollen

et al. 2015

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What does leaf wax δD from a mixed C3/C4 vegetation region tell us?

Cited by 73 publications

References 56 publications

The C<sub>32</sub> alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

The C<sub>32</sub> alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

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Holocene sea level and environmental change on the west coast of South Africa: evidence from plant biomarkers, stable isotopes and pollen

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What does leaf wax δD from a mixed C3/C4 vegetation region tell us?

Cited by 73 publications

References 56 publications

The C&lt;sub&gt;32&lt;/sub&gt; alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

The C&lt;sub&gt;32&lt;/sub&gt; alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

Untitled

Holocene sea level and environmental change on the west coast of South Africa: evidence from plant biomarkers, stable isotopes and pollen

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The C<sub>32</sub> alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

The C<sub>32</sub> alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins