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Session Chair: Prof. Johnny André Johannessen Session Chair: Prof. Weiqiang Ma
Room:313 - Continuing Education College (CEC)
59055 - Extreme Weather & Climate
59376 - Sea Level & Beaufort Gyre
Presentations
9:00am - 9:45am Oral ID: 195 / S.1.5: 1 Oral Presentation Climate Change: 59055 - Monitoring Extreme Weather and Climate Events Over China and Europe Using Newly Developed RS Data
A new mechanism of forming ozone mini holes/highs over North China Plain (NCP) in Winter
Fuxiang Huang1, Bo Yu2, Sang Li2, Jinlong Fan1, Ruixia Liu3, Abhay Devasthale4
1National Satellite Meteorological Center, Beijing, People's Republic of China; 2Beijing Weather Forecast Center, Beijing, People's Republic of China; 3National Meteorological Center, CMA, Beijing, People's Republic of China; 4Swedish Meteorological and Hydrological Institute (SMHI), Sweden
A large number of studies explored the mechanisms of synoptic-scale forming of ozone mini holes/highs: far-range meridional transport of air masses from regions with different climatological ozone mixing ratios (called “mechanism A”) and adiabatic vertical displacement of isentropes (mechanism B). In the paper, we investigate ozone mini holes/highs events over the North China Plain in winter during 1979-2019. The analysis shows that most ozone mini holes/highs events conform to the mechanism A and B and two typical weather change processes accompanying with these events: rapid cooling weather processes accompanies with ozone minihighs, while abnormal rapid warming weather processes accompanies with ozone miniholes. However, we also find a significant proportion of anomalous events do not conform to this rule: rapid cooling processes accompanies with ozone minihighs, while rapid warming processes accompanies with ozone minihighs. Behind these abnormal phenomena, there may exists a new ozone mini holes/highs forming mechanism: rapid cooling weather processes accompanies with ozone miniholes, while abnormal warming weather processes accompanies with ozone minihighs. The new mechanism may be related to the land and sea position of the North China Plain in the east and its landform features in the west.
9:45am - 10:30am Oral ID: 253 / S.1.5: 2 Oral Presentation Climate Change: 59376 - Pacific Modulation of the Sea Level Variability of the Beaufort Gyre System in the Arctic Ocean
Pacific Modulation Of The Sea Level Variability In The Arctic Ocean And Nordic Seas.
Johnny André Johannessen1, Roshin P. Rai2, Jianqi Sun3, Antonio Bunaduce4, Yang Liu5, Lluisa Puig Moner6
1NERSC, Norway; 2NERSC, Norway; 3Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences; 4NERSC, Norway; 5Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences; 6Department of Mathematics, University of Bergen, and Nansen Environmental and Remote Sensing Center, Bergen, Norway
ID: 59376/DRAGON 5 Title: Pacific modulation of the Sea level variability in the Arctic Ocean and Nordic Seas.
It is crucial to monitor and understand regional sea-level changes that can differ from Global Mean Sea Level (GMSL) both in terms of magnitude as well as governing forcing and mechanisms (Stammer et al., 2013). For instance, while changes in salinity can have significant distinct impact on regional sea level change, such as in the Arctic Ocean, it has minor effect on GMSL. Quantifying the natural variability in the regional sea level change is also urgent in order to distinguish it from a potentially forced (anthropogenic) signal. Furthermore, the role of remote impact of climate variability in one region on the other needs to be well-understood. Climate change in the Pacific can, for instance, impact Arctic warming and the sea ice (Li et al., 2015; Svendsen et al., 2018; Yang et al., 2020). How this translates to sea level change remains unclear. The aim of this study is to examine and relate the sea level variability of the Beaufort Gyre (BG) in the Arctic Ocean to natural climate variability of the Pacific Ocean.
In so doing, results of three distinct analyses are reported here: (i) The variability of the BG as estimated using the state-of-the-art ESA Cryo-TEMPO altimeter data, while freshwater content estimates are derived from in-situ observations, ocean reanalysis and satellite sea surface salinity, satellite altimeter and gradiometer data; (ii) The benefits of the reprocessed altimetry dataset at 5 Hz with augmented signal resolution to study the mesoscale-based sea level variability of the Arctic and Nordic Seas; (iii) The usefulness of estimating a Multiparameter Eddy Significant Index in the Nordic Seas; and (iv) The remarkable role of North Pacific Oscillation in the Beaufort Sea level change.