@article {2706,
	title = {Local and regional wildfire activity in central Maine (USA) during the past 900~years},
	journal = {Journal of Paleolimnology},
	volume = {58},
	year = {2017},
	month = {Jan-12-2017},
	pages = {455 - 466},
	abstract = {Climatic and environmental change has a direct effect on wildfire frequencies and distributions throughout many regions of the world. Reconstructions from natural archives such as lake sediments can extend temporally limited historical records of regional wildfire activity over longer timescales through sedimentary charcoal analysis or examining polycyclic aromatic hydrocarbon (PAH) concentrations. To date, little work has been completed on sedimentary PAH distributions from lacustrine records in the Northeastern United States, making it difficult to assess how accurately PAHs trace fire activity in the region, the spatial scope of the signal (local vs. regional), or if certain compounds do a more adequate job of tracking fire than others. In this study, we examine PAHs and macrocharcoal from a varved sedimentary record from Basin Pond, Fayette, Maine (USA). We find that a drastic increase in the concentrations of 12 measured PAHs occurred during the nineteenth to twentieth centuries due to industrialization of the region. Additionally, elevated concentrations of the PAH retene were found to be coeval with known large-scale regional wildfire events that occurred in 1761{\textendash}1762, 1825, and 1947 (A.D.). We used the ratio of the PAHs retene and chrysene to infer differences in biomass burning versus anthropogenic combustion sources because retene is associated with conifer resin whereas chrysene is associated with fossil fuel burning. Our new Basin Pond PAH records, along with a local signal of fire occurrence from charcoal analysis, offers the prospect of using this multi-proxy approach as a method for examining long-term wildfire frequency at both the local and regional scale in the Northeastern US.},
	issn = {0921-2728},
	doi = {10.1007/s10933-017-0002-z},
	url = {https://link.springer.com/article/10.1007/s10933-017-0002-z},
	author = {Miller, Daniel R. and Casta{\~n}eda, Isla S. and Bradley, Raymond S. and MacDonald, Dana}
}
@article {31,
	title = {Assessment of branched GDGTs as temperature proxies in sedimentary records from several small lakes in southwestern Greenland},
	journal = {Organic Geochemistry},
	volume = {82},
	year = {2015},
	pages = {33-41},
	abstract = {This study of five small (<3.0 ha) lakes in southwestern Greenland examines the veracity of branched glycerol dialkyl glycerol tetraethers (br GDGTs) as a temperature proxy in lacustrine systems. The proximity (<5 km) of the lakes suggests that their temperature history, and thus their br GDGT records, should be similar. Distributions of br GDGTs in (i) surface sediments from all five lakes, (ii) 14C-dated sediment cores from two lakes (Upper and Lower EVV Lakes) and (iii) soil samples from the area surrounding the lakes were examined. The temporal records of br GDGT-based temperature for the two cores exhibited both similarities and major discrepancies. The differences between the paleotemperature records for the two lakes suggest that br GDGTs are not solely soil-derived, reflecting air temperature, but also indicate an additional br GDGT contribution from another source. Among the broader suite of lake sediments, there was a strong correlation (R2 0.987) between br GDGT-based surface sediment temperatures and measured summer bottom water temperatures for the four lakes with hypoxic/anoxic bottom waters, including Upper EVV Lake. The correlation suggests production of br GDGTs by anaerobic bacteria within the bottom water and/or sediment{\textendash}water interface, reflecting environmental temperature for the individual lakes and augmenting the uniform, soil-derived signal. Hence, assessment of br GDGTs in Greenland lake sediments provides evidence for their origin from anaerobic autochthonous bacteria and indicates that interpretation of lacustrine br GDGT-based paleotemperature records requires contextual knowledge of individual lake systems and potential source(s) of sedimentary br GDGTs.},
	issn = {0146-6380},
	doi = {10.1016/j.orggeochem.2015.02.005},
	url = {http://www.sciencedirect.com/science/article/pii/S0146638015000388},
	author = {Colcord, Devon E. and Cadieux, Sarah B. and Brassell, Simon C. and Casta{\~n}eda, Isla S. and Pratt, Lisa M. and White, Jeffrey R.}
}
