MERCURY: A Fast and Versatile Multi‐Resolution Based Global Emulator of Compound Climate Hazards

20992 6 111708 2 337671 document 111708 J Adv Model Earth Syst - 2025 - Nath - MERCURY A Fast and Versatile Multi‐Resolution Based Global Emulator of Compound.pdf application/pdf ebcd79a9a0ad8931e45754663403a043 MD5 2611734 2025-11-17 09:07:16 https://pure.iiasa.ac.at/id/eprint/20992/1/J%20Adv%20Model%20Earth%20Syst%20-%202025%20-%20Nath%20-%20MERCURY%20%20A%20Fast%20and%20Versatile%20Multi%E2%80%90Resolution%20Based%20Global%20Emulator%20of%20Compound.pdf 20992 1 1 application/pdf text en public cc_by_4

J Adv Model Earth Syst - 2025 - Nath - MERCURY A Fast and Versatile Multi‐Resolution Based Global Emulator of Compound.pdf

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/111708 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/111708 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/111708 archive 353 disk0/00/02/09/92 2025-11-17 09:09:19 2025-11-17 09:09:19 2025-11-17 09:09:19 article show Nath S. Carreau J. Kornhuber K. 2521 0000-0001-5466-2059 Pfleiderer P. Schleussner C.-F. 9915 0000-0001-8471-848X Naveau P. MERCURY: A Fast and Versatile Multi‐Resolution Based Global Emulator of Compound Climate Hazards pub ECE ICI emulator, wavelets, image compression, compound events, climate models High-impact climate damages are often driven by compounding conditions, such as elevated heat stress arising from combined high humidity and temperatures. To explore future changes in compounding hazards under several climate scenarios, climate emulators can provide light-weight, data-driven complements to Earth System Models (ESMs). Yet, only a few existing emulators jointly emulate multiple climate variables. We introduce MERCURY (Multi-resolution EmulatoR for CompoUnd climate Risk analYsis), a spatio-temporal, multi-resolution emulator designed for compound climate risk analysis. MERCURY employs image-compression-based techniques for memory-efficient emulation and consists of two main modules. The regional module represents the monthly, regional response of a given variable to yearly Global Mean Temperature using a probabilistic additive model, resolving regional cross-correlations. The resulting regional values are then jointly disaggregated to grid-cell level values using a lifting-scheme operator, founded on principles of Discrete Wavelet Transforms. We demonstrate MERCURY on the humid-heat metric, wet bulb globe temperature (WBGT), as derived from temperature and relative humidity emulations. The emulated WBGT spatial correlations correspond well to those of ESMs and the 95 and 97.5 quantiles of WBGT distributions are well captured, with an average of 5 deviation. MERCURY's setup allows for region-specific emulations from which one can efficiently "zoom" into the grid-cell level across multiple variables by means of the reverse lifting-scheme operator. This circumvents the traditional problem of having to emulate complete, global-fields of climate data and resulting storage requirements. 2025-11-08 published American Geophysical Union doi:10.1029/2024MS004905 3792 3686 public Journal of Advances in Modeling Earth Systems 17 11 e2024MS004905 TRUE 1942-2466 info:eu-repo/semantics/article