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    On the origin of enhanced North Pacific midlatitude winter storm track activity (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-02
    Description: In this study, we demonstrate that the enhanced storm track activity in the North Pacific midlatitudes during boreal winter over the past four decades was correlated with subtropical warming which strengthened midlatitude meridional temperature gradient. On the contrary, Arctic warming reduced the near-surface temperature gradient and had negative correlation with midlatitude storm track activity. The close relationship between temperature gradient and synoptic eddy activity is dynamically fundamental and can be seen in both long-term trends and the interannual variation. The observed trends in warming sea surface temperature (SST) in the subtropical North Pacific, ascending motion over the subtropical western North Pacific and anticyclonic circulation over the central and western North Pacific suggests a positive feedback between warming SST and atmospheric circulation. Numerical experiments further revealed that SST warming in the subtropical North Pacific and in the Indian Ocean could drive subtropical tropospheric warming and anticyclonic circulation in the North Pacific, as well as the strengthening of the North Pacific midlatitude storm track activity. The results suggest tropical and subtropical influence on North Pacific midlatitude winter weather.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 2
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    Positive ozone-circulation feedback enhances stratospheric circulation variability (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-27
    Description: Recent studies have suggested that using interactive instead of prescribed ozone in models can alter the stratospheric circulation variability. However, the key processes regarding the underlying dynamics and feedbacks of this effect are only poorly understood. Here, we use a dry-dynamical core model with a simplified linear ozone scheme and a shortwave radiation parameterization to study the ozone-circulation feedback in an idealized setting. From two long control simulations using either interactive or prescribed ozone we find significant increases in the persistence time scale and interannual variability of the stratospheric circulation from interactive ozone. The effect is strongest during northern spring, a time when there is sufficient solar radiation over the northern Arctic to create significant ozone-related heating anomalies. Since perturbations in the polar vortex are known to be associated with considerable ozone anomalies, we focus our subsequent analysis on strong and weak polar vortex events. While interactive ozone does not change the overall frequency of the events, we find significant changes in their seasonal occurrence frequency and clear signs for ozone-enhanced radiative heating anomalies in the aftermath of the events. This increases the circulation anomalies of the events and the strength and persistence of their annular mode signature at the surface. Our findings suggest that the ozone-circulation feedback is positive, and that ozone is important for the simulation of the stratospheric circulation, its variability, and its impacts at the surface.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
    Electronic Resource
    Electronic Resource
    Rate of Entry in Emulsion Polymerization: Free-Radical Entry Controlled by Aqueous Phase Growth (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 3337-3340 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00090a030
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  • 4
    Electronic Resource
    Electronic Resource
    Factors affecting plant uptake and phytotoxicity of cadmium added to soils (1972)
    s.l. : American Chemical Society
    Environmental science & technology 6 (1972), S. 1005-1009 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60071a008
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  • 5
    Electronic Resource
    Electronic Resource
    Cadmium contamination of soil and its uptake by oats (1972)
    s.l. : American Chemical Society
    Environmental science & technology 6 (1972), S. 555-557 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60065a001
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  • 6
    Electronic Resource
    Electronic Resource
    Anistropic hole formation in thin polymer films confined by walls (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 8204-8208 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report dewetting behavior of thermally annealed thin polymer strips of poly (styrene-b-butadiene-b-styrene) and polystyrene films that are laterally confined by polydimethylsiloxane walls on silicon substrate. Regularly spaced holes are initially nucleated on the polymer surface and then grow with the aid of the confining walls, resulting in the formation of distinctly observable, regularly spaced blocks of the strip. It is observed that the dependence of hole density on the film thickness severely deviates from the conventional capillary wave model. This anomaly may be related to the viscoleastic properties of the polymer film. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1409540
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  • 7
    Electronic Resource
    Electronic Resource
    Controlled polymer dewetting by physical confinement (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 7714-7718 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report ordering of polymer drops that takes place when a thin polystyrene film confined by polydimethylsiloxane walls dewets on a silicon substrate. When annealed above the glass transition temperature, the thin polymer film dewets, resulting in the formation of a regular structure inside and outside the confinement. It is found that the ordering becomes strongly suppressed as the film thickness increases and the pattern size decreases due to the physical confinement of the mold. As a result, the ordering can take place only when the wavelength of the capillary wave is smaller than the characteristic length of the physical confinement. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1467898
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  • 8
    Electronic Resource
    Electronic Resource
    Phase determination using high-order multiple diffraction of X-rays (1988)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 63-70 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The effect of invariant phases on the intensity profiles of high-order N-beam X-ray diffractions, with N 〉 3, is investigated. Theoretically, the second-order Bethe approximation and the graphic analysis of the structure-factor multiplets involved in the dispersion equation of the dynamical theory of X-ray diffraction are employed to reveal the dominant invariant phases in the multiple diffraction processes. It is shown that the phases of the triplets or the quartets are the effective phases which affect the multiply diffracted intensities. Experimentally, the intensity profiles of four-, five-, six- and eight-beam cases provide clear evidence to support the theoretical considerations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767387008596
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  • 9
    Electronic Resource
    Electronic Resource
    Purification and characterization of vitellin from the mature ovaries of prawn, Macrobrachium rosenbergh
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 105 (1993), S. 609-615 
    Details
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0305-0491(93)90096-N
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  • 10
    Electronic Resource
    Electronic Resource
    ESSESA, an expert system for structure elucidation from spectral analysis - Part II. Novel algorithm of perception of the linear independent smallest set of smallest rings
    Amsterdam : Elsevier
    Analytica Chimica Acta 262 (1992), S. 179-191 
    Details
    ISSN: 0003-2670
    Keywords: Expert system ; Smallest set of smallest rings ; Structure perception
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0003-2670(92)80022-Y
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