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<p>Please join us for this week's EOAS Colloquium speaker Friday Jan
20 at 3pm in 1050:</p>
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<p class="MsoNormal" style="margin-bottom:0in;text-align:center;
line-height:normal;layout-grid-mode:char" align="center"><b><span style="font-size:16.0pt;
font-family:"Times New Roman",serif">Model- and
Data-Based Approaches for
Identifying Controlling Processes of an Environmental System
and my View of Environmental
Data Science</span></b></p>
<p class="MsoNormal" style="margin-bottom:0in;text-align:center;
line-height:normal;layout-grid-mode:char" align="center"><b><span style="font-size:16.0pt;
font-family:"Times New Roman",serif"> </span></b></p>
<p class="MsoNormal" style="margin-bottom:0in;text-align:center;
line-height:normal;layout-grid-mode:char" align="center"><span style="font-size:16.0pt;
font-family:"Times New Roman",serif">Dr. Ming Ye (</span><span style="font-size:
16.0pt"><a href="mailto:mye@fsu.edu"><span style="font-family:"Times New Roman",serif">mye@fsu.edu</span></a></span><span style="font-size:16.0pt;font-family:"Times New
Roman",serif">), Professor</span></p>
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<p class="MsoNormal" style="margin-bottom:0in;text-align:center;
line-height:normal;layout-grid-mode:char" align="center"><span style="font-size:12.0pt;
font-family:"Times New Roman",serif">Department of
Earth, Ocean, and
Atmospheric Science and Department of Scientific Computing</span></p>
<p class="MsoNormal" style="margin-bottom:0in;text-align:center;
line-height:normal;layout-grid-mode:char" align="center"><span style="font-size:12.0pt;
font-family:"Times New Roman",serif">Florida State
University</span></p>
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inter-ideograph;line-height:normal;layout-grid-mode:char"><span style="font-size:12.0pt;font-family:"Times New
Roman",serif"> </span></p>
<p class="MsoNormal" style="margin-bottom:0in;text-align:justify;text-justify:
inter-ideograph;line-height:normal;layout-grid-mode:char"><span style="font-size:12.0pt;font-family:"Times New
Roman",serif">An environmental
system is open and complex, and its evolution in space and time
involves a
large number of natural and anthropogenic processes and their
interactions. It
is necessary to identify controlling processes and process
interactions for
advancing our understanding of the environmental system to
support
science-informed decision-making on environmental protection.
This seminar
presents both model- and data-based approaches that we have
recently developed for
identifying controlling processes. The model-based approaches
use global
sensitivity analyses, and have a unique feature of addressing
uncertainty not
only in process representations (i.e., process models) but also
in process
parameters (i.e., process model parameters). The approaches are
</span><span style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-bidi-theme-font:
minor-bidi">designed to answer the following question: if we are
not certain
about process representations and process parameter values, can
we identify <span style="mso-bidi-font-style:italic">important
or influential processes for developing
and improving environmental system models? The model-based
approaches are always
computational expensive, but can be applied to an
environmental system with
scarce data. The data-based approaches do not require
developing process models,
but use data to identify spatio-temporal patterns and the
processes that
control the patterns. This is achieved in our studies by using
cluster analysis
(one-way clustering and co-clustering) and </span><i style="mso-bidi-font-style:
normal">t</i><span style="mso-bidi-font-style:italic">-distributed
Stochastic
Neighbor Embedding (t-SNE) methods. An example application
will be presented
for a dataset of 13,024 groundwater geochemical measurements
for 11 geochemical
parameters of 1,184 groundwater samples collected over 23
years from 29
monitoring in a regional aquifer. The model- and data-based
approaches are an
integration of environmental science, mathematics and
statistics, and computer
science. At the last of the presentation, I will discuss our
research on study
sinkhole lakes at Lake Miccosukee and Lake Jackson located in
Tallahassee. <br>
</span></span></p>
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</span></span></p>
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<p class="MsoNormal" style="margin-bottom:0in;text-align:justify;text-justify:
inter-ideograph;line-height:normal;layout-grid-mode:char"><b><span style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-bidi-theme-font:
minor-bidi;mso-bidi-font-style:italic">The two figures below
are for
illustrating the model- and data-based approaches. </span></b></p>
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