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Developing and Analyzing Statistically Downscaled Climate Projections for the South Central U.S.

Uncertainty Analysis of New Statistically Downscaled Climate Projections for the South Central U.S.

Dates

Start Date
2016
End Date
2020-09-10
Release Date
2015

Summary

Global climate models (GCMs) are a tool used to model historical climate and project future conditions. In order to apply these global-scale datasets to answer local- and regional-scale climate questions, GCMs undergo a process known as “downscaling”. Since there are many different approaches to downscaling there associated sources of uncertainty; however, downscaled data can be highly valuable for management decision-making if used with a knowledge of its limitations and appropriate applications. In order to use downscaled data appropriately, scientists and managers need to understand how the climate projections made by various downscaling methods are affected by uncertainties in the climate system (such as greenhouse gas emissions [...]

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CarlsbadCavernsNatlPark_NM_AlanCressler.jpg
“Carlsbad Caverns National Park - Credit: Alan Cressler”
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Purpose

Downscaling techniques are often used to generate finer scale projections of climate variables as the coarse resolution of the global climate models (GCMs) prevents them from resolving, small-­‐scale dynamical features, and because the stakeholders often need relevant information at the local scale. However, different sources of uncertainty can affect the downscaled projections. Here we will assess the sensitivity of three statistical downscaling techniques and three daily climate variables, to the use of three different gridded observation-­‐based datasets, three GCMs and three 21st century emission scenarios. Thus, we will produce 243 sets of local-­‐scale climate projections -­‐of potential use in subsequent climate impacts analyses-­‐ to study the uncertainties. The downscaled climate projections will be made available for stakeholders to download, supplemented by stakeholder engagement across the region. The study area encompasses all or parts of eight states (NM, TX, OK, LA, CO, KS, AR and MO). Overall, planning agencies, stakeholders, hydrological modelers, ecologists, biologists and economists, among many others, will benefit from knowing the sensitivities of the downscaling methods to these sources of uncertainty, as analyzing the differences among the 243 projections will provide valuable information regarding the level of confidence we should attribute to the local scale climate projections.

Project Extension

parts
typeTechnical Summary
valueThis novel project will investigate the sensitivity of statistically downscaled climate projections of three daily climate variables (precipitation, maximum temperature and minimum temperature) to four factors that contribute to the uncertainty in downscaled climate projections. The factors are: a) choice of future greenhouse gas and aerosol emissions scenario, b) choice of Global Climate Model (GCM), c) choice of Statistical Downscaling (SD) algorithm and, d) choice of gridded observation-­‐based datasets used to train the SD algorithms. Acknowledging these four sources of uncertainty is key to making well-­‐informed decisions. We find that, in the climate impacts literature, factors (a) and (b) are often considered, but (c) and (d) are typically neglected. Here, we propose to quantitatively examine the effect that uncertainties in all four have on downscaled projections for the south central region, using a representative sample of each factor. The proposed work will produce multiple sets of downscaled climate projections of potential use in subsequent climate impacts analyses, and it will yield guidance promoting the informed use of downscaled climate products. Statistically downscaled climate projections will be made available for stakeholders to download and supplemented by stakeholder engagement across the region. The study area encompasses all or parts of eight states (NM, TX, OK, LA, CO, KS, AR and MO), and covers all or portions of the domain of the following LCCs: (i) Desert, (ii) Eastern Tallgrass Prairie and Big Rivers, (iii) Great Plains, (iv) Gulf Coast Prairie, (v) Gulf Coastal Plains and Ozarks, and (vi) Southern Rockies.
projectStatusCompleted

Budget Extension

annualBudgets
year2015
totalFunds85000.0
year2016
totalFunds52160.0
parts
typeAward Type
valueInteragency Agreement
typeAward Number
valueG15PG00088
totalFunds137160.0

Carlsbad Caverns National Park - Credit: Alan Cressler
Carlsbad Caverns National Park - Credit: Alan Cressler

Map

Spatial Services

ScienceBase WMS

Communities

  • National and Regional Climate Adaptation Science Centers
  • South Central CASC

Associated Items

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Provenance

rfpManager-1.126.2

Additional Information

Identifiers

Type Scheme Key
RegistrationUUID NCCWSC 71a0e898-fac4-42c1-aa43-50cc72db1d16
StampID NCCWSC SC14-GC0200

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