Abrupt regime shifts in the North Atlantic atmospheric circulation over the last deglaciation

Löfverström, Marcus; Lora, Juan M.

doi:10.1002/2017GL074274

Title: Abrupt regime shifts in the North Atlantic atmospheric circulation over the last deglaciation

Journal Article · Wed Aug 02 00:00:00 EDT 2017 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2017GL074274· OSTI ID:1473897

^[1];

^[2]

National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
Univ. of California, Los Angeles, CA (United States). Dept. of Earth, Planetary, and Space Sciences

Here, we analyze modeling results of the North Atlantic atmospheric winter circulation from a transient climate simulation over the last 21,000 years. In agreement with previous studies, we find that the midlatitude jet stream assumes a strong, stable, and zonal disposition so long as the North American ice sheets remain in their continent-wide Last Glacial Maximum (LGM) configuration. However, when the Laurentide ice sheet (LIS) and Cordilleran ice sheet separate (~14,000 years ago), the jet stream abruptly changes to a tilted circulation regime, similar to modern. The proposed explanation is that the dominant stationary wave source in the North Atlantic sector changes from the LIS to the Cordilleran mountain range during the saddle collapse. As long as the LIS dominates, the circulation retains the zonal LGM state characterized by prevalent stationary wave reflection in the subtropical North Atlantic. When the Cordillera takes over, the circulation acquires its modern disposition with a weak and meridionally tilted jet stream and storm track.

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Research Organization:: National Center for Atmospheric Research (NCAR), Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)

Grant/Contract Number:: SC0012606; AGS‐PRF‐1524866

OSTI ID:: 1473897

Alternate ID(s):: OSTI ID: 1374905

Journal Information:: Geophysical Research Letters, Vol. 44, Issue 15; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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