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4 results on '"Jacob L. Gunnarson"'

1. Drivers of future extratropical sea surface temperature variability changes in the North Pacific

Author

Jacob L. Gunnarson, Malte F. Stuecker, and Sen Zhao

Subjects
Environmental sciences, GE1-350, Meteorology. Climatology, QC851-999
Abstract

Abstract Under anthropogenic warming, future changes to climate variability beyond specific modes such as the El Niño-Southern Oscillation (ENSO) have not been well-characterized. In the Community Earth System Model version 2 Large Ensemble (CESM2-LE) climate model, the future change to sea surface temperature (SST) variability (and correspondingly marine heatwave intensity) on monthly timescales and longer is spatially heterogeneous. We examined these projected changes (between 1960–2000 and 2060–2100) in the North Pacific using a local linear stochastic-deterministic model, which allowed us to quantify the effect of changes to three drivers on SST variability: ocean “memory” (the SST damping timescale), ENSO teleconnections, and stochastic noise forcing. The ocean memory declines in most areas, but lengthens in the central North Pacific. This change is primarily due to changes in air-sea feedbacks and ocean damping, with the shallowing mixed layer depth playing a secondary role. An eastward shift of the ENSO teleconnection pattern is primarily responsible for the pattern of SST variance change.

Published
2024
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4. A complex storm system in Saturn’s north polar atmosphere in 2018

Author

Ulyana A. Dyudina, J. F. Sanz-Requena, John J. Blalock, Kunio M. Sayanagi, Manel Soria, Jon Legarreta, T. del Río-Gaztelurrutia, Jacob L. Gunnarson, Shawn P. Ewald, T. Barry, J. M. Gómez-Forrellad, Michael H. Wong, M. Delcroix, Enrique Garcia-Melendo, Agustín Sánchez-Lavega, R. Hueso, Santiago Pérez-Hoyos, Amy Simon, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. TUAREG - Turbulence and Aerodynamics in Mechanical and Aerospace Engineering Research Group

Subjects
010504 meteorology & atmospheric sciences, Saturn (Planet)--Atmosphere, Astronomy and Astrophysics, Storm, 01 natural sciences, Saturn (Planet), Latitude, Atmosphere, Saturn (Planeta), Climatology, Saturn, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], 0103 physical sciences, Convective storm detection, Polar, White Spots, 010303 astronomy & astrophysics, Geology, 0105 earth and related environmental sciences, Great White Spot
Abstract

Producción Científica, Saturn’s convective storms usually fall in two categories. One consists of mid-sized storms ∼2,000 km wide, appearing as irregular bright cloud systems that evolve rapidly, on scales of a few days. The other includes the Great White Spots, planetary-scale giant storms ten times larger than the mid-sized ones, which disturb a full latitude band, enduring several months, and have been observed only seven times since 1876. Here we report a new intermediate type, observed in 2018 in the north polar region. Four large storms with east–west lengths ∼4,000–8,000 km (the first one lasting longer than 200 days) formed sequentially in close latitudes, experiencing mutual encounters and leading to zonal disturbances affecting a full latitude band ∼8,000 km wide, during at least eight months. Dynamical simulations indicate that each storm required energies around ten times larger than mid-sized storms but ∼100 times smaller than those necessary for a Great White Spot. This event occurred at about the same latitude and season as the Great White Spot in 1960, in close correspondence with the cycle of approximately 60 years hypothesized for equatorial Great White Spots., Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (project AYA2015-65041-P), Gobierno Vasco (project IT-366-19)

Published
2020

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