The Scandinavian (SCA) pattern is an important climate signal in regulating the variability of summer extreme precipitation (SEP) over the eastern slopes of the Tibetan Plateau (ESTP). There is a strong negative corre...
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The Scandinavian (SCA) pattern is an important climate signal in regulating the variability of summer extreme precipitation (SEP) over the eastern slopes of the Tibetan Plateau (ESTP). There is a strong negative correlation between the SCA pattern and SEP over the ESTP, with a correlation coefficient of -0.57. Moisture budget analysis showed that the dynamic component anomalies of both the zonal and vertical moisture advection induced by the SCA pattern play the dominant roles in extreme precipitation variability over the ESTP. These anomalies are solely linked to variations in zonal wind and vertical velocity. The anomalies of the SCA pattern propagate downstream through Rossby waves, leading to the formation of cyclonic circulations over northern East Asia and the Iranian Plateau. The westerlies on the southern side of these cyclonic circulations play a crucial role in influencing the development of significant anomalous westerlies over the ESTP. The anomalous westerlies bring climatologically moist air from the Tibetan Plateau (TP) to the ESTP, resulting in positive zonal moisture advection anomalies over the area. Furthermore, these anomalous westerlies transport climatologically warm air from the TP to the ESTP, leading to significant warm advection anomalies and vertical upward motion anomalies over the ESTP. The upward motion carries lower-tropospheric moisture upward, resulting in positive vertical moisture advection anomalies over the ESTP. The combination of these positive zonal and vertical moisture advection anomalies eventually leads to excessive SEP. (sic)(sic)(sic)(sic)(sic)(sic)(SCA)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic). SCA(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)-0.57. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), SCA
The Scandinavian(SCA) pattern is an important climate signal in regulating the variability of summer extreme precipitation(SEP) over the eastern slopes of the Tibetan Plateau(ESTP). There is a strong negative correlat...
The Scandinavian(SCA) pattern is an important climate signal in regulating the variability of summer extreme precipitation(SEP) over the eastern slopes of the Tibetan Plateau(ESTP). There is a strong negative correlation between the SCA pattern and SEP over the ESTP, with a correlation coefficient of -0.57. Moisture budget analysis showed that the dynamic component anomalies of both the zonal and vertical moisture advection induced by the SCA pattern play the dominant roles in extreme precipitation variability over the ESTP. These anomalies are solely linked to variations in zonal wind and vertical velocity. The anomalies of the SCA pattern propagate downstream through Rossby waves, leading to the formation of cyclonic circulations over northern East Asia and the Iranian Plateau. The westerlies on the southern side of these cyclonic circulations play a crucial role in influencing the development of significant anomalous westerlies over the ESTP. The anomalous westerlies bring climatologically moist air from the Tibetan Plateau(TP) to the ESTP, resulting in positive zonal moisture advection anomalies over the area. Furthermore, these anomalous westerlies transport climatologically warm air from the TP to the ESTP, leading to significant warm advection anomalies and vertical upward motion anomalies over the ESTP. The upward motion carries lower-tropospheric moisture upward, resulting in positive vertical moisture advection anomalies over the ESTP. The combination of these positive zonal and vertical moisture advection anomalies eventually leads to excessive SEP.
Water vapor in the stratosphere makes a significant contribution to global climate change by altering the radiative energy budget of the Earth’s climate *** many previous studies have shown that the El Ni?o–Southern...
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Water vapor in the stratosphere makes a significant contribution to global climate change by altering the radiative energy budget of the Earth’s climate *** many previous studies have shown that the El Ni?o–Southern Oscillation(ENSO)has significant effects on the water vapor content of the stratosphere in terms of the annual or seasonal mean,a comprehensive analysis of the seasonal evolution of these effects is still *** reanalysis data and satellite observations,we carried out a composite analysis of the seasonal evolution of stratospheric water vapor during El Ni?o/La Ni?a peaks in winter and decays in *** ENSO has a distinct hysteresis effect on water vapor in the tropical lower *** El Ni?o/La Ni?a events moisten/dry out the tropical lower stratosphere in both winter and spring,whereas this wetting/dehydration effect is more significant in *** pattern is due to a warmer temperature in the upper troposphere and lower stratosphere during the El Ni?o spring phase,which causes more water vapor to enter the stratosphere,and vice versa for La Ni?*** delayed warming/cooling in the lower stratosphere during the El Ni?o/La Ni?a decay in spring leads to the seasonal evolution of ENSO effects on water vapor in the lower stratosphere.
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