Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM
To study the dynamical mechanism by which Arctic amplification affects extreme weather events in mid-latitude, we investigated the local and remote circulation response to pan-Arctic and regional Arctic thermal forcing. A comprehensive atmospheric GCM (General Circulation Model) coupled to a slab mi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/14/3/510 |
| _version_ | 1827751438584905728 |
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| author | Gun-Hwan Yang Woosok Moon Hayeon Noh Baek-Min Kim |
| author_facet | Gun-Hwan Yang Woosok Moon Hayeon Noh Baek-Min Kim |
| author_sort | Gun-Hwan Yang |
| collection | DOAJ |
| description | To study the dynamical mechanism by which Arctic amplification affects extreme weather events in mid-latitude, we investigated the local and remote circulation response to pan-Arctic and regional Arctic thermal forcing. A comprehensive atmospheric GCM (General Circulation Model) coupled to a slab mixed-layer ocean model is used for the experiment. With the increasing thermal forcing in the pan-Arctic configuration, the mid-latitude jet tends to shift equatorward, mainly due to the southward shift of the convergence zone of eddy-heat flux and eddy-momentum flux. From the regional Arctic forced experiments, zonal mean response is similar to the response from the pan-Arctic configuration. The non-zonal response is characterized by the 300 hPa circumpolar zonal wind of wavenumber-1 structure, which establishes an enhanced wavier mid-latitude jet. In the polar region at 300 hPa, regional thermal forcing drives a distinct east–west dipole circulation pattern, in which anticyclonic circulation is located to the west of the thermal forcing, and cyclonic circulation is located to the east. The lower-level circulation shows the opposite pattern to the upper-level circulation in the polar region. While the strength of circulation increases with gradual thermal forcing, the overall dipole pattern is unchanged. In regional warming simulation, compared to the pan-Arctic warming, increasing residual heat flux in a dipole pattern causes enhanced heat advection to mid-latitude. |
| first_indexed | 2024-03-11T06:57:02Z |
| format | Article |
| id | doaj.art-fddd24fd2adc4a4ebbcdc2dd0750b78f |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-11T06:57:02Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-fddd24fd2adc4a4ebbcdc2dd0750b78f2023-11-17T09:32:44ZengMDPI AGAtmosphere2073-44332023-03-0114351010.3390/atmos14030510Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCMGun-Hwan Yang0Woosok Moon1Hayeon Noh2Baek-Min Kim3Division of Earth Environmental System Science, Major of Environmental Atmospheric Sciences, Pukyong National University, Busan 48513, Republic of KoreaDivision of Earth Environmental System Science, Major of Environmental Atmospheric Sciences, Pukyong National University, Busan 48513, Republic of KoreaDivision of Earth Environmental System Science, Major of Environmental Atmospheric Sciences, Pukyong National University, Busan 48513, Republic of KoreaDivision of Earth Environmental System Science, Major of Environmental Atmospheric Sciences, Pukyong National University, Busan 48513, Republic of KoreaTo study the dynamical mechanism by which Arctic amplification affects extreme weather events in mid-latitude, we investigated the local and remote circulation response to pan-Arctic and regional Arctic thermal forcing. A comprehensive atmospheric GCM (General Circulation Model) coupled to a slab mixed-layer ocean model is used for the experiment. With the increasing thermal forcing in the pan-Arctic configuration, the mid-latitude jet tends to shift equatorward, mainly due to the southward shift of the convergence zone of eddy-heat flux and eddy-momentum flux. From the regional Arctic forced experiments, zonal mean response is similar to the response from the pan-Arctic configuration. The non-zonal response is characterized by the 300 hPa circumpolar zonal wind of wavenumber-1 structure, which establishes an enhanced wavier mid-latitude jet. In the polar region at 300 hPa, regional thermal forcing drives a distinct east–west dipole circulation pattern, in which anticyclonic circulation is located to the west of the thermal forcing, and cyclonic circulation is located to the east. The lower-level circulation shows the opposite pattern to the upper-level circulation in the polar region. While the strength of circulation increases with gradual thermal forcing, the overall dipole pattern is unchanged. In regional warming simulation, compared to the pan-Arctic warming, increasing residual heat flux in a dipole pattern causes enhanced heat advection to mid-latitude.https://www.mdpi.com/2073-4433/14/3/510Arctic amplificationatmospheric circulationjetclimate changeidealized model |
| spellingShingle | Gun-Hwan Yang Woosok Moon Hayeon Noh Baek-Min Kim Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM Atmosphere Arctic amplification atmospheric circulation jet climate change idealized model |
| title | Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM |
| title_full | Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM |
| title_fullStr | Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM |
| title_full_unstemmed | Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM |
| title_short | Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM |
| title_sort | mid latitude jet response to pan arctic and regional arctic warming in idealized gcm |
| topic | Arctic amplification atmospheric circulation jet climate change idealized model |
| url | https://www.mdpi.com/2073-4433/14/3/510 |
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