BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:ENAC Seminar Series by Dr. Robert Ladwig
DTSTART:20220713T160000
DTEND:20220713T170000
DTSTAMP:20261005T050035Z
UID:817993f577bf22203275a888cdb4c42c682b72e4a8bdf11c595bc34f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Robert Ladwig\n16:00 – 17:00 – Dr. Robert Ladwig\nPost
 doctoral Research Fellow\, University of Wisconsin‐Madison\, USA\n\nExp
 loring lake metabolism phenology through modeling: How physics and ecology
  drive an emergent lake ecosystem property\n\nThe availability of dissolve
 d oxygen in lakes governs ecological habitats and niches\, redox reaction 
 rates\, and the decomposition of organic matter. Although proximal control
  over lake dissolved oxygen can be attributed to metabolism and physical p
 rocesses\, how those processes evolve over decades largely remains unexplo
 red and there is much to be learned about the interactions of external dri
 vers with internal processes that control metabolic patterns. As global c
 hange will affect in-lake metabolism significantly by decreasing oxygen so
 lubility\, enhancing respiration and primary production\, and limiting ver
 tical transport\, robust approaches that combine observational data with p
 rocess-based models are required to understand potential future changes in
  lake health.\nIn this talk\, I will present three studies that applied di
 fferent aquatic ecosystem modelling approaches to analyze long-term change
  of dissolved oxygen in lakes. By applying a vertical 1D lake model to qua
 ntify year-to-year dynamics of anoxia in an urban eutrophic lake\, we foun
 d that anoxia variability is influenced primarily by physical processes\, 
 and less so by processes that influence organic matter decomposition. In 
 the second study\, a metabolism model framework was applied to multiple la
 kes in Wisconsin spanning a range of lake characteristics to investigate c
 hange in metabolism phenology. We found that landscape-related differences
  in metabolism between the forested lakes in the north and the urban lakes
  in the south are likely related to trophic states as well as hydrology. 
 The third study showcases how hybrid modeling can improve aquatic ecosyste
 m projections by combining process-based models with data-driven methods. 
 By using high-frequency data directly in a modularized model framework\, w
 e can estimate challenging model parameters and processes while still gett
 ing physically valid results due to the process-based model framework.\n\n
 \n\n\nShort bio:\nRobert Ladwig is a physical limnologist and currently a 
 Postdoctoral Research Fellow at the Center for Limnology at the University
  of Wisconsin-Madison. Dr. Ladwig received his Ph.D. jointly between the L
 eibniz-Institute of Freshwater Ecology and Inland Fisheries and the Chair 
 of Water Resources Management and Modeling of Hydrosystems at the Technica
 l University of Berlin. As a Visiting Researcher at Saitama University in 
 Japan\, he worked on improving mitigation strategies to prevent the format
 ion of harmful algal blooms in reservoirs. His work explores linkages betw
 een physical and biogeochemical processes\, and the influence on aquatic e
 cosystem's biology and ecosystem function through the use of cutting-edge 
 data-intensive and computationally demanding techniques. As an advocate of
  open-access and open-source scientific software\, Dr. Ladwig has develope
 d various tools for process-based lake modeling to increase the accessibil
 ity of models for novice and experienced users. His current work investiga
 tes the physical-biogeochemical interactions that drive the long-term dyna
 mics of hypolimnetic anoxia formation\, and the phenology of metabolic pro
 cesses driven by climate and land use changes. Dr. Ladwig is an active mem
 ber of the Global Lake Ecological Observatory Network (GLEON)\, in which h
 e moderates the lake modeling working group\, and the Aquatic Ecosystem Mo
 deling Network Junior (AEMON-J).\n\n\n 
LOCATION:GC B1 10 https://plan.epfl.ch/?room==GC%20B1%2010 https://epfl.zo
 om.us/j/69676599130
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR