洪浩哲Hong, Hao-Jhe

研究興趣


平流層臭氧–環流交互作用 (Stratospheric ozone-circulation interaction), 北太平洋海溫變異性 (North Pacific SST variability)

代表著作


Hong, H.-J. and Hsu, H.-H.*: Remote tropical central Pacific influence on driving sea surface temperature variability in the Northeast Pacific, Environ. Res. Lett., 18, 044005, https://doi.org/10.1088/1748-9326/acc087, 2023.

李明營、洪浩哲、許晃雄、王品翔,2023:2020-2021 臺灣百年大旱原因分析(Causes of the Record-breaking Drought in Taiwan in 2020-2021)。大氣科學,第五十一期,第二號,30–57。

Hsu, P.-C., Hsu, H.-H.*, Hong, H.-J., Chen, Y.-T., Chen, Y.-L., Tseng, W.-L.: 2021 Texas cold snap: Manifestation of natural variability and a recent warming trend, Weather Clim. Extrem., 37, 100476, https://doi.org/10.1016/j.wace.2022.100476, 2022.

Hong, H.-J.* and Reichler, T.: The Simplified Chemistry-Dynamical Model (SCDM V1.0), Geosci. Model Dev., 14, 6647–6660, https://doi.org/10.5194/gmd-14-6647-2021, 2021.


Hong, H.-J.* and Reichler, T.: Local and remote response of ozone to Arctic stratospheric circulation extremes, Atmos. Chem. Phys., 21, 1159–1171, https://doi.org/10.5194/acp-21-1159-2021, 2021.

研究成果介紹


Ozone-Circulation Interaction in the Stratosphere
Ozone is a key constituent of the stratosphere that modulates the thermal structure of the atmosphere and prevents harmful ultraviolet radiation from the surface. It is well known that during the Arctic circulation extremes, e.g., Stratospheric Sudden Warming, anomalous high ozone concentration occurred in the polar cap region due to enhanced dynamical ozone transport from the lower latitudes. Our study indicated that significant decreases in ozone were also observed in the tropics, highlighting the global influences of Arctic circulation extremes. We also developed a simplified chemistry-dynamical model (SCDM V1.0), which couples a linear ozone scheme and a shortwave radiative parameterization into a widely used idealized model. The new model is economical and has the advantage of isolating the ozone effect on circulation. Our ongoing work is to use the model for an in-depth study of the role of interactive ozone in the variability of the coupled stratosphere-troposphere system.


The North Pacific SST Variability
The Northeast Pacific (NEP) had two record-breaking marine heatwave events (MHWs) in the winters of 2013–2015 and summer of 2019, which had a detrimental impact on the fisheries, marine ecosystems, and climate in North America. Here, we investigated the cause of sea surface temperature (SST) variability in NEP during late spring–summer of 1981–2020. The regression circulation anomalies to the principal component of leading EOF mode suggested that the warm NEP SST were characterized by a cyclonic circulation anomaly in the midlatitude North Pacific and a warming SST center in the Gulf of Alaska. We noted that this cyclonic circulation anomaly, attributable to a barotropic atmospheric wave originating from the tropical central Pacific (CP) in the preceding spring, reduced the surface heat flux loss from the ocean to the atmosphere in the NEP and led to the warm SST anomalies in summer. This finding was confirmed by not only empirical diagnosis but also long-term numerical simulations forced by the observed SST perturbations in the tropical CP. Our results highlight the role of the tropical CP SST in driving the summertime North Pacific SST variability through the atmospheric bridge in recent decades.
 

  • 博士
    美國猶他大學
    大氣科學系 (2020)
  • 碩士
    國立中央大學
    大氣科學系 (2013)
  • 學士
    國立中央大學
    大氣科學系 (2010)
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