Jann Paul Mattern


Jann Paul Mattern

research scientist

UC Santa Cruz


I am an applied statistician working as an assistant researcher at the Ocean Sciences department at the University of California Santa Cruz. My research interests are focused on the development and implementation of statistical methods that combine large sets of observations with complex numerical models, including data assimilation, optimization and uncertainty analyses.


  • scientific computing
  • data assimilation
  • marine modelling


  • PhD in Applied Statistics, 2012

    Dalhousie University

  • MSc in Computational Life Sciences, 2008

    Universität zu Lübeck

  • BSc in Computational Life Sciences, 2006

    Universität zu Lübeck

Recent Publications

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Dual number-based variational data assimilation: Constructing exact tangent linear and adjoint code from nonlinear model evaluations

Dual numbers allow for automatic, exact evaluation of the numerical derivative of high-dimensional functions at an arbitrary point with …

A Simple Finite Difference‐Based Approximation for Biogeochemical Tangent Linear and Adjoint Models

We present a technique that accurately approximates tangent linear and adjoint models for data assimilation applications using only …

Improving Variational Data Assimilation through Background and Observation Error Adjustments

A procedure to objectively adjust the error covariance matrices of a variational data assimilation system is presented. It is based on …

Modeling of nitrogen and phosphorus profiles in sediment of Osaka Bay , Japan with parameter optimization using the polynomial chaos expansion

Coastal sediments adjacent to urban centers often receive high loads of organic matter (OM) due to large nutrient inputs from land that …

Data assimilation of physical and chlorophyll a observations in the California Current System using two biogeochemical models

Biogeochemical numerical models coupled to physical ocean circulation models are commonly combined with data assimilation in order to …



Assistant Researcher

Ocean Sciences Department, UC Santa Cruz

2017 – Present Santa Cruz, California

Postdoctoral Fellow

Ocean Sciences Department, UC Santa Cruz

2013 – 2017 Santa Cruz, California

Postdoctoral Fellow

Department of Oceanography, Dalhousie University

2012 – 2013 Halifax, Canada

PhD student

Department of Oceanography, Dalhousie University

2009 – 2012 Halifax, Canada

Student assistant

Institute for Neuro- and Bioinformatics, Universität zu Lübeck

2004 – 2007 Lübeck, Germany

Computer skills

advanced experience




intermediate experience







Teaching experience

  • teaching graduate level course Python programming for Ocean Scientists consisting of 19 classes, UC Santa Cruz (28.5 h total)
  • teaching labs for Marine Modelling, Dalhousie University (2008, 2010, 2011; 9h total)
  • teaching class in Multivariate Analysis, Dalhousie University (2011; 1.5h total)