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  • English  (7)
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  • 1
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    Morphological Differences of the Northern Equatorial Ionization Anomaly Between the Eastern Asian and American Sectors. (2020)
    In:  Journal of Geophysical Research: Space Physics
    Details
    Publication Date: 2020-12-14
    Description: The morphological difference of the northern equatorial ionization anomaly between theeastern Asian and American sectors is statistically studied with ground‐based total electron content datafrom 2000 to 2011. The intensity (Ic), latitudinal location (Lc), and occurrence time (Tc) of the daytimeequatorial ionization anomaly crest are derived from daytime peak total electron content in time‐latitudeplots. The main results are as follows.Lcin the two sectors exhibits an apparent difference, especially in solarminimum, during whichLcin the American sector shows an annual variation that is more poleward innorthern summer and more equatorward in northern winter, whileLcin the eastern Asian sector shows asemiannual variation that is more poleward around equinoxes and more equatorward around solstices.Ictends to be stronger in the eastern Asian sector than that in the American sector in all seasons, and thisdifference increases with the increase of the solarflux index.Tctends to be earlier in northern winter andlater in northern summer in both sectors and shows dependence on solar activity. We demonstrate thatthe seasonal variation ofLcin the American sector is not dominated by the ionospheric equatorial zonalelectricfield, and suggest that the difference ofLcbetween the two sectors is probably related to differentmeridional wind effects due to the displacement of geographic and magnetic equators. TheIcdifference isprobably related to the longitudinal wave number‐3 and‐4 structures driven by tidal forcing from the5lower atmosphere.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
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    Role of Pacific preconditioning in modulating the relationship between the spring North Tropical Atlantic SST and the ensuing El Niño (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-09
    Description: Previous literature has indicated that a spring cold sea surface temperature (SST) anomaly in the North Tropical Atlantic (NTA) could induce an ensuing El Niño event. However, observations show that this relationship is not always robust. For example, the spring cold NTA SST anomalies are not necessarily accompanied by El Niño events in the ensuing winter. Two types of cases are further classified for comparison: a spring cold NTA SST anomaly accompanied by an El Niño (tagged as NTA-El Niño) and a spring cold NTA SST anomaly accompanied by no El Niño (tagged as NTA-Normal). Statistical analysis indicates that Pacific preconditioning acts an important role in modulating the NTA SST and El Niño relationship. The zonal wind anomaly over the eastern subtropical Pacific serves as an important medium linking the spring NTA SST anomaly to the subsequent development of El Niño, and this part of the zonal wind anomaly in spring and summer is largely associated with the preceding winter tropical Pacific SST anomaly. The proposed mechanism is verified by two groups of Coupled General Circulation Models (CGCMs) runs with a weak and strong La Niña condition. Compared with the strong La Niña case, under a weak La Niña case in the previous winter, the spring cold NTA SST anomaly is more capable of modulating the development of the ensuing El Niño event. The present study suggests the importance of Pacific preconditioning while forecasting ENSO with the precursor of the spring NTA SST anomaly.
    Language: English
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  • 3
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    The solar radiation variation and its absorption by the terrestrial atmosphere (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-05-04
    Description: The Sun has an obvious quasi-11-year cycle and numerous short-term eruptive activities. From the aspect of energy, there are four processes of energy transmission in the effectuation chain of solar forcing to the climate system: the solar energy input to the atmosphere, the atmospheric absorption to the input energy, the transformation of the absorbed energy to dynamic and thermodynamic responses in the atmosphere, and the coupling among all the layers affected by solar forcings. However, the four processes have not been discussed in their entirety. In this present paper, studies in recent decade on how the solar radiation varies during the solar cycle as well as the eruptions, and correspondingly how the terrestrial atmosphere absorbs the input solar energy are reviewed.
    Language: English
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  • 4
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    Decadal shift of the monsoon rainband in China modulated by the 11-year solar cycle (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-15
    Description: China's summer precipitation rain belt has a quasi-ten-year cycle. However, the reason for this is still unclear. This study finds decadal shift of the monsoon rainband in China is modulated by the 11-year solar cycle during the last six solar cycles. And the sensitive time period corresponds to the typical East Asian monsoon rainy season (mei-yu season), characterized by a largescale quasi-zonal monsoon rainband. The place is also a special region where the boundary of summer monsoon located during the rainy the season. During the high sunspot number (SSN) years, the mei-yu rainband lies 1.2 degree farther north, and the amplitude of its interannual variations increases when compared with low SSN years. The robust response of monsoon rainband to solar forcing is dynamically related to an anomalous general atmospheric pattern with an up–down seesaw and a north–south seesaw over East Asia. The up-down seesaw is influenced by the stratospheric ozone and the tropopause westerly jet, and the north-south seesaw to the onset of the tropical monsoon and SST anomaly in a key region of the western Pacific. Anomalies of the East Asia/Pacific teleconnection (EAP) and Walker circulation likely plays an important role in the north-south propagation of solar signal.
    Language: English
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  • 5
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    Morphological analysis of three-dimensional features of float and outcrop rocks in Zhurong landing region (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-04
    Description: China’s first autonomous Mars rover, Zhurong, has carried out an exploration mission on the Utopian Plain. As Martian rocks and their three-dimensional (3D) morphology are essential for exploring the geological evolution of Mars, we identified 6,185 centimeter-scale rocks from the Zhurong NaTeCams images using an automatic approach, and 3D morphological features are then calculated for each rock. The statistical result shows that small rocks in centimeters make up the majority. Morphological analyses of rocks in different areas show that landscape type affects the number of rocks but has no clear relation to the size-frequency distribution of rocks. The outcrop rocks, the predominate type of rocks in the Zhurong landing area, and the float rocks around a crater are distributed differently in proportions regarding all morphological features, suggesting different formation and fragmentation processes of these two types of rocks. Further comparative analysis with the rocks at the Spirit traverse is also conducted. Some commonalities between the Zhurong outcrop rocks and the Spirit volcanic rocks are found in 2D shape compactness and 3D sphericity. Meanwhile, the float rocks are distributed significantly differently, indicating their source is not the same with the outcrop rocks, but is highly likely an impact event. In general, this study provides new insight into the Martian surface characteristics based on the centimeter-scale 3D rocks in the Zhurong landing area.
    Language: English
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  • 6
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    Phase-locked impact of the 11-year solar cycle on tropical Pacific decadal variability (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-24
    Description: As an important external thermal forcing, the effect of the 11-year solar cycle on the tropical Pacific decadal variability is an interesting question. Here, we systematically investigate the phase-locking of the atmosphere and ocean covariations to the solar cycle in the tropical Pacific and propose a new mechanism to explain these decadal covariations. In both observation/reanalysis datasets and a solar cycle forced sensitivity experiment (SOL), the ocean heat content anomalies (OHCa, 300 m) resemble a La Niña-like pattern in the solar cycle ascending phase, and the Walker circulation shifts westward. In the declining phase, the opposite is true. The accumulative solar irradiation directly contributes to this coherent decadal variability via changing the warm water volume and the solar-related heat is redistributed by the ocean dynamical transports. During the 11-year solar cycle, the Pacific Walker circulation anomalies maintain the OHCa in the western equatorial Pacific and work as negative feedback for the eastern Pacific to help the OHCa phase transition. In addition, oceanic meridional heat transport via the subtropical cells and the propagation of off-equatorial Rossby waves also provide a lagged negative feedback to the OHCa phase transition according to the 11-year solar cycle. The decadal coupled responses of the tropical Pacific climate system are 2 years more lag in the SOL experiment than in the observation/reanalysis.
    Language: English
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  • 7
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    Synergetic effects of ENSO and Eurasian snow cover on the low temperature extreme events in Southern China (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-27
    Description: Based on multiple data and statistical analysis methods, the variation characteristics of the number of days with extreme low temperature (NDELT) in southern China from 1980 to 2019 were analyzed in the paper. In further, the independent and synergistic effects of the Central Equatorial Pacific sea surface temperature anomaly (SSTA) and the Siberian snow cover anomaly (SSCA) were investigated. The analysis shown that the atmospheric general circulation over Eurasia were dominated by a type of meridional dipole anomaly pattern with characteristic of "high north and low south" during the winters with more NDELT in southern China. The SSTA in the equatorial Central Pacific influences NDELT mainly through the atmospheric general circulation anomaly over low-middle latitudes while SSCA acts by affecting that over mid-high latitudes. On the other hand, SSCA in early October could result in the atmospheric general circulation anomaly over mid-high latitudes, which is associated with NDELT and has a strengthening and supplementing effect on that of SSTA in the equatorial Central Pacific. The comparative analysis revealed that both SSTA and SSCA have important impacting on NDELT in southern China, but they were independent factors and acted in different ways and processes. Therefore, considering the synergistic effect of SSTA in the central equatorial Pacific and SSCA could be a way to improve the prediction ability of NDELT in winter in southern China.
    Language: English
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