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Impacts of the wintertime North Pacific subtropical and subarctic oceanic frontal zones on the atmosphere

Authors

Huang,  Jing
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhang,  Yang
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yang,  Xiu-Qun
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang,  Xin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ren,  Xuejuan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Huang, J., Zhang, Y., Yang, X.-Q., Wang, X., Ren, X. (2023): Impacts of the wintertime North Pacific subtropical and subarctic oceanic frontal zones on the atmosphere, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1196


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017417
Abstract
Oceanic frontal zone is key region of the oceanic feedback to the atmosphere in the extratropics. The oceanic frontal zone in the wintertime North Pacific exhibits a unique double fronts structure, with a subtropical oceanic frontal zone (STFZ) and a subarctic frontal zone (SAFZ). The feedback of the variability of the two oceanic frontal zones in the wintertime North Pacific on the atmosphere are investigated using daily observational data. The anomalies of the STFZ and SAFZ are both associated with the dipolar SST anomalies with cold (warm) anomalies in the north (south). Following the peak of the STFZ and SAFZ, the dipolar SST anomalies can both maintain almost 30 days. For the STFZ, the anomalous upward surface heat flux in the south of the STFZ indicates the warming effect of the warm SST anomalies on the overlying atmosphere, resulting in the positive anomalies of the near-surface air temperature. The combined effects of the warm anomalies of the near-surface air temperature in the south of the STFZ and cold anomalies of the near-surface air temperature induced by the atmospheric advection result in the enhancement of the near-surface baroclinicity over the STFZ. However, with weak and insignificant anomalous upward surface heat flux, we find that the feedback of the SAFZ on the atmosphere is much weaker. The weak feedback is attributed to downstream of the anomalous atmospheric circulations associated with the SAFZ, which results in the weak air-sea humidity difference and wind speed.