The Aleutian-Icelandic lows seesaw and related interannual variation of the mass-weighted isentropic zonal mean meridional circulation ...
<!--!introduction!--> The atmospheric general circulation diagnosed by the mass-weighted isentropic zonal mean exhibits extratropical direct (ETD) circulation driven by eddy momentum transport. Using a reanalysis dataset, we investigated regional atmospheric modulations associated with the yea...
| Main Authors: | , , , |
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| Format: | Conference Object |
| Language: | unknown |
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GFZ German Research Centre for Geosciences
2023
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| Online Access: | https://dx.doi.org/10.57757/iugg23-2223 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018584 |
| Summary: | <!--!introduction!--> The atmospheric general circulation diagnosed by the mass-weighted isentropic zonal mean exhibits extratropical direct (ETD) circulation driven by eddy momentum transport. Using a reanalysis dataset, we investigated regional atmospheric modulations associated with the year-to-year variability of ETD circulation in boreal winter. Composite analyses showed that the interannual variability of ETD circulation accompanies a seesaw-like variation between the Aleutian (AL) and Icelandic lows (IL), which coincides with the Pacific–North American teleconnection pattern and North Atlantic dipole anomaly. A diagnosis using isentropic airmass fluxes representing the geographical Lagrangian mean motion indicated that the significant intensification of upper-tropospheric poleward warm airflow over the eastern North Pacific is responsible for the enhanced ETD circulation, together with the intensified equatorward lower cold airflow over East Asia and eastern North America. The resultant enhanced ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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