Igert ears lacawac workshop on lake sentinels craig williamson miami university
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IGERT EARS Lacawac Workshop on Lake Sentinels: Craig Williamson Miami University. Ganguly, A. R., K. Steinhaeuser, D. J. Erickson III, M. Branstetter, E. S. Parish, N. Singh, J. B. Drake, L. Buja, “Higher trends but larger uncertainty and geographic variability in 21st

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Igert ears lacawac workshop on lake sentinels craig williamson miami university

IGERT EARSLacawac Workshop on Lake Sentinels:Craig WilliamsonMiami University


Ganguly, A. R., K. Steinhaeuser, D. J. Erickson III, M. Branstetter, E. S. Parish, N. Singh, J. B. Drake, L. Buja, “Higher trends but larger uncertainty and geographic variability in 21st

century temperature and heat waves”, Proceedings of the National Academy of Sciences of the United States, 10.1073/pnas.0904495106, 2009.


Ganguly, A. R., K. Steinhaeuser, D. J. Erickson III, M. Branstetter, E. S. Parish, N. Singh, J. B. Drake, L. Buja, “Higher trends but larger uncertainty and geographic variability in 21st

century temperature and heat waves”, Proceedings of the National Academy of Sciences of the United States, 10.1073/pnas.0904495106, 2009.


What will the impacts be on water resources and terrestrial ecosystems?How do we begin to address such daunting challenges of environmental change?Where in the complex landscape should we sample for the best information?


Lakes

Respond to environmental change, and leave signals in the sediments

Lowest point in the landscape

Lakes!


You Need EARS! sedimentsEnvironmental Aquatic Resource SensingYou Need GLEON!Global Lake Ecological Observatory NetworkAdvanced sensors to network lakes across continents to look at lake sentinels.


Lakes as sentinels and integrators of environmental change
Lakes as Sentinels and Integrators of Environmental Change sediments

What is a lake sentinel?

Any physical, chemical, or biological characteristic

of a lake that responds to environmental forcing

in an informative and quantifiable way.

What is a paleoecological lake integrator?

Historical sentinels in the sediments that

provide information relevant to climate change

over longer time periods


Lakes are not isolated ecosystems
Lakes are not Isolated Ecosystems sediments

  • Photosynthesis by phytoplankton, benthic algae, macrophytes

    • Endogenous C drives lakes towards autotrophy

      = Autochthonous carbon

  • Integral part of watershed

    • Receive runoff, streamflow, groundwater

    • Inputs of fixed C = POM, DOM (measured as DOC)

    • Exogenous C drives lakes towards heterotrophy

      = Allochthonous carbon



Doc sources to lakes
DOC Sources to Lakes sediments

Roulet & Moore 2006 Nature 444:283


Leaching of sediments

dissolved

organic matter

from terrestrial

sources “feeds”

fixed C to aquatic

ecosystems


Allochthonous sources of fixed carbon
Allochthonous Sources of Fixed Carbon sediments

Vary with plant species


Pocono study lakes

Lake sedimentsLacawac

52 hectares

Mesotrophic

DOC ~ 5 mg/l

UV Z1%320nm ~ 0.5 m

Lake Giles

100 hectares

Oligotrophic

DOC ~ 1.5 mg/l

UV Z1%320nm ~ 3-4 m

Pocono Study Lakes



Usually use a semilog plot for light the 1 of surface par depth compensation depth

Usually use a semilog plot for light. sedimentsThe 1% (of surface PAR) depth = Compensation Depth


What causes temperature changes with depth why do light and temperature profiles differ

What causes temperature changes with depth? sediments

Why do light and temperature profiles differ?


Comparing April and September: sediments 1) What are two seasonal changes in temperature? 2) What are the causes of these differences? 3) What are the implications of these differences?


What causes these changes with depth and season? sedimentsRole of abiotic vs biotic factors, auto- vs. allochthony?Where is the compensation depth?


What does water transparency tell us where is the compensation depth

What does water transparency tell us? sedimentsWhere is the compensation depth?


How did oxygen change since 1990
How did oxygen change since 1990? sediments

Not much change early in year (April)


How did oxygen change since 19901
How did oxygen change since 1990? sediments

3 major types of change late in year (Sept.)


Uv transparency 14 year trends
UV Transparency: 14 year trends sediments

July data: Lake Giles,

N.E. Pennsylvania, USA



Climate change

Climate Change? sediments




What sentinels of environmental change can you find in lacawac
What sentinels of environmental change can you find in Lacawac?

  • Environmental Drivers:

  • Energy:

  • - Temperature, wind

  • Mass:

  • Precipitation, particulates,

  • Dissolved substances.

Lake sentinel:

Any physical, chemical, or biological characteristic

of a lake that responds to environmental forcing

in an informative and quantifiable way.


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