[논문]성층권 평균장이 중위도 제트에 미치는 영향: 역학코어 모형 실험

이재원; 손석우; 김서연; 송강현

doi:10.14191/atmos.2021.31.2.171

성층권 평균장이 중위도 제트에 미치는 영향: 역학코어 모형 실험
The Sensitivity of the Extratropical Jet to the Stratospheric Mean State in a Dynamic-core General Circulation Model 원문보기

대기 = Atmosphere, v.31 no.2, 2021년, pp.171 - 183

이재원 (서울대학교 지구환경과학부) , 손석우 (서울대학교 지구환경과학부) , 김서연 (서울대학교 지구환경과학부) , 송강현 (서울대학교 지구환경과학부)

Abstract ▼ AI-Helper

The sensitivity of the extratropical jet to the stratospheric mean state is investigated by conducting a series of idealized numerical experiments using a dynamic-core general circulation model. When the polar stratosphere is forced to be cold, the extratropical jet, defined by the 850-hPa zonal wind, tends to shift poleward without much change in its intensity. The opposite is also true when the polar stratosphere becomes warm. This jet response, however, is not exactly linear. A poleward jet shift under a cold vortex is much weaker than an equatorward jet shift under a warm vortex. The jet intensity change is also larger under a warm vortex. This result indicates that the stratosphere-troposphere downward coupling is more efficient for the warm and weak polar vortex. This finding is consistent with a stronger downward coupling during stratospheric sudden warming than vortex intensification events in the Northern Hemisphere winter, possibly providing a clue to better understand the observed stratosphere-troposphere downward coupling.

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표/그림 (5)

그림 Fig. 1. (a) Profile of the radiative equilibrium temperature, T_eq, for the control experiment (solid contours; contour interval of 10 K) and the added cooling for 'C4' experiment (dashed contours; contour interval of 5 K). (b) Time-mean zonally-averaged zonal wind (contours; contour interval of 10 m s^-1) and temperature (shaded) in the control experiment. (c) Same as (b) but for JRA-55 over Atlantic (85ºW-0º) averaged from 1958 to 2019 in January.
그림 Fig. 2. Time-mean zonally-averaged temperature (contours) for each experiment and its difference from control experiment (shaded). Contour intervals are 10 K.
그림 Fig. 3. Same as Fig. 2 but for time-mean zonally-averaged zonal wind. Contour intervals are 10 m s^-1.
그림 Fig. 4. (a) Zonally-averaged temperature at 30-hPa for C5, C3, CTL, W3, and W5 and (b) its difference from CTL. Same for (c) zonally-averaged zonal wind at 10-hPa and (d) its difference from CTL, and (e) zonally-averaged zonal wind at 850-hPa and (f) its difference from CTL. (c, e) Only wind over 0 m s^-1 is shown. (d, f) Dashed lines denote the latitude of maximum zonal wind at (d) 10-hPa and (f) 850-hPa from CTL.
그림 Fig. 5. The responses of (a) polar vortex intensity, (b) extratropical jet intensity, and (c) extratropical jet latitude from C5 to W5. Dashed lines denote the linear regression line for variable from (blue) CTL and cooling (C1-C5) and from (red) CTL and warming (W1-W5) experiments.

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