NDLI: Influence of vegetation change on watershed hydrology: implications for paleoclimatic interpretation of lacustrine δ$^{18}$O records

Content Provider	Springer Nature Link
Author	Rosenmeier, Michael F. Hodell, David A. Brenner, Mark Curtis, Jason H. Martin, Jonathan B. Anselmetti, Flavio S. Ariztegui, Daniel Guilderson, Thomas P.
Copyright Year	2002
Abstract	Stratigraphic shifts in the oxygen isotopic (δ$^{18}$O) and trace element (Mg and Sr) composition of biogenic carbonate from tropical lake sediment cores are often interpreted as a proxy record of the changing relation between evaporation and precipitation (E/P). Holocene δ$^{18}$O and Mg and Sr records from Lakes Salpetén and Petén Itzá, Guatemala were apparently affected by drainage basin vegetation changes that influenced watershed hydrology, thereby confounding paleoclimatic interpretations. Oxygen isotope values and trace element concentrations in the two lowland lakes were greatest between ~ 9000 and 6800 $^{14}$C-yr BP, suggesting relatively high E/P, but pollen data indicate moist conditions and extensive forest cover in the early Holocene. The discrepancy between pollen- and geochemically-inferred climate conditions may be reconciled if the high early Holocene δ$^{18}$O and trace element values were controlled principally by low surface runoff and groundwater flow to the lake, rather than high E/P. Dense forest cover in the early Holocene would have increased evapotranspiration and soil moisture storage, thereby reducing delivery of meteoric water to the lakes. Carbonate δ$^{18}$O and Mg and Sr decreased between 7200 and 3500 $^{14}$C-yr BP in Lake Salpetén and between 6800 and 5000 $^{14}$C-yr BP in Lake Petén Itzá. This decline coincided with palynologically documented forest loss that may have led to increased surface and groundwater flow to the lakes. In Lake Salpetén, minimum δ$^{18}$O values (i.e., high lake levels) occurred between 3500 and 1800 $^{14}$C-yr BP. Relatively high lake levels were confirmed by $^{14}$C-dated aquatic gastropods from subaerial soil profiles ~ 1.0–7.5 m above present lake stage. High lake levels were a consequence of lower E/P and/or greater surface runoff and groundwater inflow caused by human-induced deforestation.
Starting Page	117
Ending Page	131
Page Count	15
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	27
Issue Number	1
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Physical Geography Hydrobiology Climate Change
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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