Florida wildfires during the Holocene Climatic Optimum (9000–5000 cal yr BP)

Mendieta, Kalindhi Larios; Gerber, Stefan; Brenner, Mark

doi:10.1007/s10933-018-0023-2

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…δ 2 H stable isotopes provide a direct measure of moisture, which could cause stratigraphic differences from pollen alterations due to temperature. Furthermore, regional climate differences could cause variations in paleoclimate signals as has been shown from the studies previously mentioned as well as new charcoal records from Florida (Mendieta et al 2018).…”

Section: Elemental Changesmentioning

confidence: 80%

“…Two documented paleoclimate events that have been supported by pollen records from the southeastern United States are the Holocene Climatic Optimum (HCO) and the Hypsithermal Event (Delcourt 1980;Delcourt and Delcourt 1983;Folland et al 1990;Marcott et al 2013;Mendieta et al 2018). Both events were characterized by warm periods from 5000 -9000 years before present (cal yr BP) that coincided with a transition from Quercus spp.…”

Section: Introductionmentioning

confidence: 99%

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A 12,000 kyr paleohydroclimate record in the southeastern, U.S.A based on deuterium from bat guano

2022

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The southeastern United States endures environmental change from human population increase, climate change, and land use alterations creating the need to understand baseline conditions and environmental patterns prior to human impacts. While paleoenvironmental data can be reconstructed from a variety of archives (e.g. lake sediments, tree rings, speleothems), some geographic areas contain fewer of such records. One archive capable of recording moisture regimes and other paleoenvironmental changes over millennia but has received little attention relative to other climate proxies, are bat guano deposits in cave systems. Bat guano deposits are found in many cave environments in the southeastern United States and can be used as an archive of paleoenvironmental data including precipitation, vegetation, and aspects associated with the ecology of bats. Here, we present a 12,000-year record of paleoenvironmental change based on δ 2 H stable isotopes in a guano core collected from Cave Springs Cave in Alabama, USA. Results suggest distinct shifts in moisture during the lower Holocene/upper Pleistocene (9,551 -12,131 cal yr BP) (δ 2 H values -86.82 --77.70) and during the middle Holocene (3,886 -9,351 cal yr BP) (δ 2 H values -125.74 --80.63), roughly coinciding with the Holocene Climatic Optimum (HCO) time interval (5,000 -9,000 cal yr BP). During the last 4,000 years, conditions in the region shifted once again in the southeastern United States region. Climate inferences based on guano δ 2 H are consistent with the role of atmospheric moisture on regional vegetation changes suggested by previous pollen records obtained from lake sediment cores. This study suggests bat guano δ 2 H may be a reliable method to provide a long-term paleoclimate record.

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Section: Elemental Changesmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

A 12,000 kyr paleohydroclimate record in the southeastern, U.S.A based on deuterium from bat guano

2022

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“…This also promotes breakdown of organic matter. But because some shallow Florida lakes are known to have thick accumulations (3–8 m) of organic sediments [9, 10], we sought to determine recent OC burial rates in some of these water bodies.…”

Section: Introductionmentioning

confidence: 99%

Organic carbon sequestration in sediments of subtropical Florida lakes

et al. 2019

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Recent studies have shown that sediments of temperate and tropical lakes are sinks for organic carbon (OC), but little is known about OC burial in subtropical lakes. There are questions regarding the ability of subtropical lakes to store OC, given their relatively warmwater temperatures, lack of ice cover, frequent water-column mixing, and labile carbon forms. We used 210Pb-dated sediment cores from 11 shallow Florida (USA) lakes to estimate OC burial, i.e. net OC storage, over the last ~100 years. Shallow Florida water bodies average ~30% OC content in their sediments and displayed rates of net OC accumulation (63–177 g C m-2 a-1) that are similar to natural temperate lakes, but lower than temperate agricultural impoundments. We considered the influence of lake morphometry on OC storage in our study lakes, but did not observe an inverse relationship between lake size and OC burial rate, as has been seen in some temperate lake districts. We did, however, find an inverse relation between mean water depth and OC sequestration. Despite recent cultural eutrophication and the associated shift from macrophyte to phytoplankton dominance in the Florida study lakes, overall OC burial rate increased relative to historic (pre-1950 AD) values. Lakes cover >9000 km2 of the Florida landscape, suggesting that OC burial in sediments amounts to as much as 1.6 Mt a-1. The high rate of OC burial in Florida lake sediments indicates that subtropical lakes are important for carbon sequestration and should be included in models of global carbon cycling.

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The Northgrippian

Bampton

2023

Springer Polar Sciences

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Florida wildfires during the Holocene Climatic Optimum (9000–5000 cal yr BP)

Cited by 5 publications

References 41 publications

A 12,000 kyr paleohydroclimate record in the southeastern, U.S.A based on deuterium from bat guano

A 12,000 kyr paleohydroclimate record in the southeastern, U.S.A based on deuterium from bat guano

Organic carbon sequestration in sediments of subtropical Florida lakes

The Northgrippian

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