Abstract
The topographic dynamical effect from Eurasia (EA_Topo) and North America (NA_Topo) on the winter isentropic meridional mass circulation (IMMC) is investigated using the WACCM. The independent effect of EA_Topo and that of NA_Topo, with the former much stronger, are both to strengthen the IMMC that is composed of the lower equatorward cold air branch (CB) and the upper poleward warm air branch in the extratropical tropopshere (WB_TR) and stratosphere (WB_ST). Further investigation of the individual contributions from changes in stationary vs. transient and zonal-mean flow vs. waves reveals that, due to the topography-forced mass redistribution, changes in the low-level meridional pressure gradient force a zonal-mean counter-clockwise/clockwise meridional cell in the southern/northern side of topography. This weakens/strengthens the IMMC south/north of 30° N from the troposphere to lower stratosphere, acting as a dominant contributor to the IMMC changes south of 50° N. Meanwhile, the EA/NA_Topo-forced amplification of stationary waves constructively interacts with those determined by land-sea contrast, making the dominant/minor contributions to the strengthening of CB and WB_TR north of 50° N. The related increase in the upward wave propagation further dominates the WB_ST strengthening in the subpolar region. Meanwhile, transient eddy activities are depressed by EA/NA_Topo along with the weakened background westerly, which partly-offset/dominate-over the contribution from stationary flow in midlatitudes and subpolar region. The coexistence of the other topography (NA/EA_Topo) yields destructive mutual interferrence, which can weaken/offset the independent-EA/NA_Topo-forced meridional mass transport mainly via changing the zonal-mean as well as the downstream wave pattern of mass and meridional wind.
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Data availability
The ERA-Interim datasets used in this work are available from the ECMWF (http://www.ecmwf.int). The NCEP/NCAR Reanalysis 1 datasets are available from the NOAA (https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.tropopause.html).
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Acknowledgements
This work was jointly supported by the National Natural Science Foundation of China (42075052, 91837311), Strategic Priority Research Program of the Chinese Academy of Sciences (XDA17010105), the Natural Science Foundation of Jiangsu Province (Grants No BK20211288), and the National Key R&D Program of China (2019YFC1510201). We are grateful for the availability of WACCM, provided by NCAR via the website http://www.cesm.ucar.edu/models/current.html.
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Yu, Y., Ren, R., Xia, X. et al. A dissection of the topographic effects from Eurasia and North America on the isentropic meridional mass circulation in Northern Winter. Clim Dyn 59, 1555–1578 (2022). https://doi.org/10.1007/s00382-021-06055-6
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DOI: https://doi.org/10.1007/s00382-021-06055-6