Increases in future AR count and size: Overview of the ARTMIP Tier 2 CMIP5/6 experiment

The Atmospheric River (AR) Tracking Method Intercomparison Project (ARTMIP) is a community effort to systematically assess how the uncertainties from AR detectors (ARDTs) impact our scientific understanding of ARs. This study describes the ARTMIP Tier 2 experimental design and initial results using the Coupled Model Intercomparison Project (CMIP) Phases 5 and 6 multi-model ensembles. We show that AR statistics from a given ARDT in CMIP5/6 historical simulations compare remarkably well with the MERRA-2 reanalysis. In CMIP5/6 future simulations, most ARDTs project a global increase in AR frequency, counts, and sizes, especially along the western coastlines of the Pacific and Atlantic oceans. We find that the choice of ARDT is the dominant contributor to the uncertainty in projected AR frequency when compared with model choice. These results imply that new projects investigating future changes in ARs should explicitly consider ARDT uncertainty as a core part of the experimental design.

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Author O’Brien, T.A.
Wehner, M.F.
Payne, A.E.
Shields, Christine A.
Rutz, J.J.
Leung, L.‐R.
Ralph, F.M.
Collow, A.
Gorodetskaya, I.
Guan, B.
Lora, J.M.
McClenny, E.
Nardi, K.M.
Ramos, A.M.
Tomé, R.
Sarangi, C.
Shearer, E.J.
Ullrich, P.A.
Zarzycki, C.
Loring, B.
Huang, H.
Inda‐Díaz, H.A.
Rhoades, A.M.
Zhou, Y.
Publisher UCAR/NCAR - Library
Publication Date 2022-03-27T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Resource Version N/A
Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:17:15.740377
Metadata Record Identifier edu.ucar.opensky::articles:25289
Metadata Language eng; USA
Suggested Citation O’Brien, T.A., Wehner, M.F., Payne, A.E., Shields, Christine A., Rutz, J.J., Leung, L.‐R., Ralph, F.M., Collow, A., Gorodetskaya, I., Guan, B., Lora, J.M., McClenny, E., Nardi, K.M., Ramos, A.M., Tomé, R., Sarangi, C., Shearer, E.J., Ullrich, P.A., Zarzycki, C., Loring, B., Huang, H., Inda‐Díaz, H.A., Rhoades, A.M., Zhou, Y.. (2022). Increases in future AR count and size: Overview of the ARTMIP Tier 2 CMIP5/6 experiment. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d70v8hft. Accessed 28 July 2025.

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