DASH

DAta Science-informed attribution of changes in the Hydrological cycle

Started
December 1, 2017
Status
In Progress
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Abstract

The main goal of the DASH (“DAta Science-informed attribution of changes in the Hydrologic cycle“) project is to improve the detection and attribution of climate change by incorporating data science and statistical learning methods. Detection and attribution (D&A) is a key methodology in climate science whose aim is to study the causal links between external drivers of the climate system and observed changes in climate variables (IPCC 2021). Improving our understanding of the factors that contribute to climate changes, such as anthropogenic emissions or natural variability, is of great relevance to society in order to anticipate and adapt to such changes, both on a global scale and regionally, for example in Switzerland. According to the IPCC standard terminology detection is the process of determining whether there is an observed change in a climate variable that cannot be explained by internal variability alone but without providing a reason for that change, while attribution is the process of providing a likely reason for the detected change. While it is well established that global-scale climate warming over the last decades and century is driven by human emissions of greenhouse gases and aerosols (e.g., see the most recent IPCC report: Sixth Assessment Report), important gaps of our understanding remain when it comes to climate changes on a regional scale (e.g., can warming or changes in the water cycle over Switzerland be attributed with high confidence to anthropogenic climate change?), or on short time scales (do extreme events, or daily patterns of climate variables, carry a signal of climate change?).

People

Collaborators

SDSC Team:
Eniko Székely
Guillaume Obozinski

PI | Partners:

Institute for Atmospheric and Climate Science:

  • Prof. Reto Knutti
  • Dr. Sebastian Sippel

More info

Seminar for Statistics:

  • Prof. Nicolai Meinshausen

More info

National Center for Atmospheric Research:

  • Dr. Angeline Pendergrass

More info

description

Goal:

Advance the detection and attribution (D&A) of climate change by incorporating advanced machine learning, statistical learning and data science methods.

Impact:

Advance the state-of-the-art on D&A techniques using data science, to finally guide climate model development based on the agreement or mismatch of models and observations, and improve the confidence in the detection and attribution statements.

Proposed approach:

Incorporate new statistical techniques for D&A using machine learning and causal inference to achieve robust predictions. We developed a novel detection and attribution methodology based on supervised statistical learning that uses explicitly the information contained in a target of interest to identify “fingerprints” of climate change (see Figure attached for a temperature fingerprint) that are representative of the target, such as anthropogenic or volcanic fingerprints. The methodology relies on a hypothesis testing framework and uses a statistical learning techniques inspired from causal inference that incorporates robustness constraints. These constraints help to increase the confidence in the detection and attribution statements. This methodology was used for both attribution of greenhouse gases and aerosols, and for detection to make it robust even under potentially large internal climate variability, a remaining long standing issue in climate science. In parallel work, we showed that a climate change signal can be detected from daily patterns of temperature and humidity at the global scale for every day since 2012. On a different line of work, we refined a traditional climate science method (“dynamical adjustment”) using data science, and we show that this allows to uncover the forced climate response as a residual from circulation-induced variability.

Gallery

Bibliography

  1. Hasselmann, K. F. On the signal-to-noise problem in atmospheric response studies. In Joint Conference of Royal Meteorological Society, American Meteorological Society, Deutsche Meteorologische Gesellschaft and the Royal Society (ed. Shaw, D. B.) 251–259 (Royal Meteorological Society, 1979)
  2. C. Deser, R. Knutti, S. Solomon, and A. S. Phillips. Communication of the role of natural variability in future North American climate. Nature Climate Change, 2, 775-779, DOI: https://doi.org/10.1038/nclimate1562 (2012).
  3. D. Rothenhäusler, N. Meinshausen, P. Bühlmann, J. Peters. Anchor regression: Heterogeneous data meet causality. Journal of the Royal Statistical Society: Series B (Statistical Methodology), Vol. 83 (2), pages 215-246, https://rss.onlinelibrary.wiley.com/doi/abs/10.1111/rssb.12398 (2021)

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