Modeling the Effects of Past and Future Climate Change on GLKN Lakes | Apply Online

Frequently Asked Questions (FAQs): Modeling the Effects of Past and Future Climate Change on GLKN Lakes (National Park Service)

1) What is the main purpose of this National Park Service grant opportunity?

The opportunity focuses on explaining recent and surprising ecological shifts in remote inland lakes located within national park units of the Great Lakes Network (GLKN). The project is designed to test whether climate warming is causally linked to these shifts and to identify the physical and biological mechanisms that control how different lakes respond.

2) What lake problems is the project trying to understand?

The lakes have shown signs of deterioration, including blooms of harmful blue-green algae (cyanobacteria). Sediment core evidence suggests these current changes are unusual compared to the lakes' recent historical conditions, making the shifts especially concerning.

3) Why does the notice suggest land use change and phosphorus inputs may not explain the lake deterioration?

The notice emphasizes that these lakes are protected and relatively isolated systems within national park units. Because of that setting, the typical driver of eutrophication seen in many regions (land use change leading to increased phosphorus inputs) does not appear to account for what is happening in these particular lakes.

4) What hypothesis is the project intended to test?

The central hypothesis is that climate warming is driving the ecological shift in GLKN lakes. The notice highlights two climate-related physical changes that may be key: a longer ice-free season and stronger summer thermal stratification. Both conditions can favor harmful algal blooms and can alter lake food webs.

5) What role do sediment cores play in the proposed work?

Lake sediments are treated as natural archives of past lake conditions. By collecting and analyzing sediment cores, the project can reconstruct ecological changes through time and compare recent conditions to earlier periods documented in the sediment record.

6) What are diatoms, and why are they central to this project?

The project proposes to analyze diatoms preserved in sediment cores. Diatom community composition is closely tied to lake environmental conditions, including water chemistry, temperature, nutrient dynamics, and mixing conditions. Because diatoms are preserved in sediments, changes in diatom communities through the sediment layers can be used to reconstruct how lake conditions have changed over time.

7) How will the study compare different kinds of lakes?

The notice describes comparing diatom-based reconstructions across four broad lake categories chosen to represent different sensitivities to warming. Those categories include shallow versus deep lakes, and lakes with small versus large surface areas. The goal is to clarify whether certain lake types are inherently more vulnerable to climate-driven ecological instability than others.

8) What does the project mean by reconstructing each lake's "thermal history"?

Reconstructing thermal history refers to rebuilding past physical conditions such as the strength and duration of thermal stratification, the length of the ice-free season, and broader temperature patterns. This is intended to help determine when and how lake physical behavior shifted relative to ecological changes recorded in sediments.

9) How will the project reconstruct lake thermal conditions?

The approach described combines local or regional climate records with hydrodynamic lake modeling. Hydrodynamic modeling translates meteorological conditions into expected lake temperature profiles and mixing regimes, producing lake-specific thermal records.

10) Why is it important to align modeled thermal records with sediment core timelines?

Aligning these timelines allows investigators to compare the timing of physical changes (such as longer ice-free seasons or stronger stratification) with shifts in biological communities (as reconstructed from diatoms). This alignment is central to testing whether physical climate changes likely occurred before, during, or after ecological shifts.

11) What are the expected outputs or end goals described in the notice?

The stated end goal is to integrate modeled thermal conditions and sediment-based ecological histories to build predictive relationships linking lake type to climate-induced ecological risk. In practical terms, this is meant to help park managers anticipate which lakes may be most likely to develop harmful algal blooms or other ecological changes under continued warming, and what physical conditions tend to precede those changes.

12) How is this work intended to support National Park Service management needs?

The notice frames the project as useful for improving the ability to monitor, forecast, and manage climate impacts on high-value protected waters. It is intended to move beyond simply documenting changes and toward explaining mechanisms in ways that improve prediction and management of future climate risks.

13) What type of funding notice is this and what kind of award was expected?

The opportunity was issued as a discretionary funding notice with an expected single award made through a cooperative agreement, under a natural resources funding activity category.

14) What was the estimated funding amount and the award ceiling?

The estimated total funding was $50,000, and the award ceiling was also $50,000.

15) Was cost sharing or matching funds required?

No cost-sharing requirement was described in the notice.

16) When was the opportunity posted and when did it close?

The notice was posted on June 22, 2011 and closed on June 29, 2011. The archive date was July 29, 2011.

17) Was this an open, competitive opportunity?

Eligibility was effectively limited. The notice was described as a notice of intent for a single-source task agreement award to the Science Museum of Minnesota in St. Paul, Minnesota, under the Great Lakes Northern Forest Cooperative Ecosystem Studies Unit (CESU).

18) Who was the intended recipient organization named in the notice?

The intended recipient was the Science Museum of Minnesota (St. Paul, Minnesota), under the Great Lakes Northern Forest CESU framework.

19) Why did the notice justify a single-source approach?

The justification given is that the proposed work builds on a prior collaborative foundation and depends on specialized expertise and knowledge developed in earlier efforts. The principal investigators were described as internationally recognized experts with extensive experience working in National Park units and with a diatom training set tailored to the Great Lakes region.

20) What is the diatom training set mentioned in the notice, and why does it matter?

The notice describes a diatom training set tailored to the Great Lakes region that links diatom communities to known lake environmental conditions. This is presented as central to producing reliable reconstructions and interpretations from sediment-core diatom data.

21) What is the broader scientific and practical significance of the project as described?

The project supports a targeted, mechanism-driven investigation into whether climate warming (rather than local nutrient pollution or land development) is behind recent and unprecedented ecological shifts in GLKN park lakes. By combining sediment-core biological indicators with climate-driven hydrodynamic modeling and comparing different lake types, the project aims to improve understanding, prediction, and management of future climate risks in protected waters.