Bannister 110

Reconstructing Klamath River Flow with Uncertain Instrumental Records: a Mathematical Tale of Passion, Deception, and Desire

Tree-ring based reconstructions of streamflow variability are useful to water resource management. A challenge when developing reconstructions is assessing multiple uncertainties and how these uncertainties impact use in resource management. The skill of tree-ring reconstructions greatly depends on the quality and availability of tree-ring data and the instrument records used for reconstruction training and testing. This presentation will touch on the impact of potential uncertainty in instrumental records with an emphasis on streamflow reconstructions in the Upper Klamath River basin.

Tree-Ring View of “Nameless Oscillation” in California Streamflow

An ongoing severe drought in California highlights the importance of understanding and predicting multi-year swings in moisture availability on the scale of large watersheds.  The 20th and early 21st centuries have seen large oscillations with an average period of about 15 years in annual flows of the Sacramento and San Joaquin Rivers, two major sources of water supply for the state of California.  A meeting sponsored by the California Department of Water Resources (CADWR) was held in La Jolla, California, this past May specifically to address hydrologic and climatological aspects of the rh

From cell to continent: introducing our new cambial phenology project

Our aim is to fill important gaps both in the scientific basis for the use of tree rings as natural archives of past climate and in the scientific understanding of the rates and patterns of carbon storage in annual growth layers in relation to seasonal to inter-annual climate variation. These gaps concern the basic natural history of the tissue that forms annual rings in wood, the vascular cambium.

Iron Age population-environment interaction research in Central Asia

Big Data and novel visualization tools to assess biodiversity and the vulnerability of western U. S. forests to climate change

Part of the paralysis of our climate politics is the difficulty in making climate change science tangible and personable. Biodiversity and forests in particular provide numerous services for society, human health, and the economy. Given current and projected climate change, how are our western forests changing and what will our western forests come to look like? Using new collaborative Big Data approaches to integrate, standardize, utilize, and visualize the world's biodiversity and forest data, I will present a new platform to visualize biodiversity and forest data.

Do the tree rings of African Terminalia sericera record a chemical signal from coal-fueled power plants?

South Africa relies on a primarily coal-based power supply.  The national power provider, Eskom, currently operates approximately 20 plants, and is now constructing the largest coal-fueled power plant in the southern hemisphere (5800 Megawatts) to meet growing demand.  The new plant, Medupi, will be located near coal fields in the Waterberg region and will burn high-sulfur coal.  Although there are several large coal-based plants in the Waterberg area that have operated for the last 30 years, very little environmental monitoring related to emissions was ever conducted, and retrospective ana

Tree-Ring Network and Climate in the Mediterranean Region

Drought is a focal point in the assessment of hydroclimatic variability in the MediterraneanBasin. Droughts can have drastic social and economic impacts, particularly in North Africa (NA)and Eastern Mediterranean (EM) where population is increasing rapidly and water supplies areextremely limited. Knowledge of drought variability on time scales of decades to centuries isneeded to understand and prepare for dry and wet conditions in the region. Drought-sensitivetree-ring records are a valuable resource for extending knowledge of hydroclimatic variabilityboth in space and time.

Florida tree rings and shipwreck rates reflect Caribbean hurricane activity since 1500

The observational record of North Atlantic tropical cyclones (TCs) is too short to inform our understanding of decadal-scale climatic controls on TC regimes. We combined two new annual-resolution proxies of Atlantic storm activity to extend the observational TC record back to the 16th Century. A tree-growth suppression chronology (1707–2010 CE) from the Florida Keys captures 91% of observed North Atlantic TCs (1850–2010 CE) and shares significant peak events with a documentary time series of Spanish shipwrecks in the Caribbean (1495–1820).

An integrated field data collection system for dendrochronology

A wide variety of information or 'metadata' is required when undertaking dendrochronological sampling.  Traditionally, researchers record observations and measurements on field notebooks and/or paper recording forms, and use digital cameras and hand-held GPS devices to capture images and record locations.  In the lab, field notes are often manually entered into spreadsheets or personal databases, which are then sometimes linked to images and GPS waypoints. This process is both time consuming and prone to human and instrument error.

Climate Response of Four Tree Species from the East-German Low Rainfall Area

Climate response was investigated for four tree species in the East German low rainfall area in Thuringia where average annual precipitation falls below 600 mm. Black Pine (Pinus nigra) has large semi-natural stands on calcareous soils far north of its natural distribution, Common Ash (Fraxinus excelsior) reaches its physiological limit along calcareous slopes.

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