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  • 1
    Book
    Book
    The South China Sea and its impact on climate (2009)
    Amsterdam [u.a.] : Elsevier
    Details Availability
    Type of Medium: Book
    Pages: S. 1 - 175 , graph. Darst.
    Series Statement: Dynamics of atmospheres and oceans 47.2009,1/3
    Language: English
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  • 2
    Book
    Book
    Indo-Pacific climate variability and predictability (2015)
    Details Availability
    Keywords: Indopazifik ; Klimavariation ; Wettervorhersage
    Type of Medium: Book
    Pages: x, 312 pages , 27 cm
    Series Statement: World Scientific Series on Asia-Pacific weather and climate 7
    URL: http://www.gbv.de/dms/bowker/toc/9789814696616.pdf
    Language: English
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  • 3
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    The unusual wet summer (July) of 2014 in Southern Europe (2018)
    Details
    Publication Date: 2020-11-25
    Description: Southern Europe (Italy and the surrounding countries) experienced an unusual wet summer in 2014. The month- ly rainfall in July 2014 was 84% above (more than three standard deviation) normal with respect to the 1982– 2013 July climatology. The heavy rainfall damaged agriculture, and affected tourism and overall economy of the region. In this study, we tried to understand the physical mechanisms responsible for such abnormal weather by using model and observed datasets. The anomalously high precipitation over Italy is found to be associated with the positive sea surface temperature (SST) and convective anomalies in the tropical Pacific through the at- mospheric teleconnection. Rossby wave activity flux at upper levels shows an anomalous tropospheric quasi- stationary Rossby wave from the Pacific with an anomalous cyclonic phase over southern Europe. This anomalous cyclonic circulation is barotropic in nature and seen extending to lower atmospheric levels, weakening the sea- sonal high and causing heavy precipitation over the Southern Europe. The hypothesis is verified using the Nation- al Centers for Environmental Prediction (NCEP) coupled forecast system model (CFSv2) seasonal forecasts. It is found that two-month lead forecast of CFSv2 was able to capture the wet summer event of 2014 over Southern Europe. The teleconnection pattern from Pacific to Southern Europe was also forecasted realistically by the CFSv2 system.
    Description: Published
    Description: 61-68
    Description: 4A. Oceanografia e clima
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Key factors in simulating the equatorial Atlantic zonal sea surface temperature gradient in a coupled general circulation model (2011)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 116 (C6). C06010.
    Details
    Publication Date: 2018-01-19
    Description: Causes of the coupled model bias in simulating the zonal sea surface temperature (SST) gradient in the equatorial Atlantic are examined in three versions of the same coupled general circulation model (CGCM) differing only in the cumulus convection scheme. One version of the CGCM successfully simulates the mean zonal SST gradient of the equatorial Atlantic, in contrast to the failure of the Coupled Model Intercomparison Project phase 3 models. The present analysis shows that key factors to be successful are high skills in simulating the meridional location of the Intertropical Convergence Zone, the precipitation over northern South America, and the southerly winds along the west coast of Africa associated with the West African monsoon in boreal spring. Model biases in the Pacific contribute to the weaker precipitation over northern South America. Uncoupled experiments with the atmospheric component further confirm the importance of remote influences on the development of the equatorial Atlantic bias. Key Points: The zonal SST gradient of the equatorial Atlantic is well simulated in a CGCM; Key factors for the realistic simulation of the Atlantic SST are presented; Remote forcing from the Pacific may contribute to the Atlantic SST bias
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2010JC006717
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
    Electronic Resource
    Electronic Resource
    Asymmetric evolution of eddies in rotating shallow water (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 4 (1994), S. 163-175 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that cyclones evolve in a way different from that of anticyclones in rotating shallow water. The anticyclones merge and eventually take circular coherent forms, but cyclones are elongated with active enstrophy cascading. This asymmetric evolution is strengthened with increasing surface displacements. When the initial surface displacement exceeds a certain critical value, the initial elongation of a cyclonic ellipse ends up with splitting in two cyclones. This splitting of the cyclonic ellipse is always associated with the first appearance of a saddle point inside the core, due to irrotational, ageostrophic motion. The appearance of the saddle point inside the core seems to be a necessary condition for splitting of the core of the cyclonic ellipse with surface displacements. The linear stability analysis of the elliptical vortex is consistent qualitatively with both of the simulation results and the kinematic axisymmetrization/elongation principle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166001
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  • 6
    Electronic Resource
    Electronic Resource
    How does the ocean response to the withdrawal of water from a watergate located at the eastern boundary on a beta-plane? (1974)
    Springer
    Journal of oceanography 30 (1974), S. 282-288 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The formation of the ‘spun up’ region by the withdrawal of water from a watergate located in the eastern boundary in a homogeneous ocean on a beta-plane at low Rossby number is presented. The ‘spun up’ region penetrates only westward from the Watergate because of the special character of the generated Rossby waves. The growth rate and the final longitudinal length of the ‘spun up’ region in the dissipative system is much affected by the watergate scale in the north-south direction. The relation with the experiment ofLong (1952) and the geophysical application are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109671
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Stability of planetary waves in a two-layer system (1976)
    Springer
    Journal of oceanography 32 (1976), S. 116-127 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A stability of planetary waves on an infinite beta-plane is investigated in an idealized two-layer fluid system for the large local Rossby numberM. When a primary wave is barotropic, two kinds of barotropic instability modes are found. One of them was previously discussed byGill (1974). When a primary wave is baroclinic, two different kinds of modes that enable barotropic and baroclinic energy transfers are found. The one that has the larger growth rate gains its energy mainly from the mean shear of the primary wave when the internal rotational Froude numberF is smaller than 1/2. WhenF is larger than 1/2, however, the available energy conversion of the primary wave is dominant. This mode has a fairly large part of its energy in the barotropic motion although the primary wave is purely baroclinic. The effect ofO(M −2) corrections is found to have a stabilizing influence on all symmetrical modes. The geophysical applications of the present analysis are suggested in the context.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02107040
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  • 8
    Electronic Resource
    Electronic Resource
    A note on boundary layers and wakes in rotating fluids (1976)
    Springer
    Journal of oceanography 32 (1976), S. 155-161 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The flow induced by the two-dimensional line vortex moving in a rotating fluid is discussed. The governing vorticity equation is linearized adopting the Oseen approximation. First, the problem is considered on a constantf-plane. The solution shows that the Stewartson E1/4 layer is transformed into the Oseen wake as the role of the advection becomes important. Second, the problem is considered on aΒ-plane. When the line vortex moves westward, the solution shows a pattern of Rossby lee waves decaying downstream of the vortex and alternating flows far upstream. When the line vortex moves eastward, the inviscid solution shows definite alternating jets downstream. In a viscous case, however, the jets become less definite and identical with the above mentioned alternating flows in the far field. Far upstream, there are no disturbances because of the special propagation characteristics of Rossby waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02107269
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical study on waves in planetary fluids (1981)
    Springer
    Journal of oceanography 37 (1981), S. 219-225 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract This article reviews the author's study on waves in planetary fluids for which the Okada Prize of the Oceanographical Society of Japan was awarded in 1981. The contents of the review are i) some connections of planetary waves with the large-scale ocean circulation, ii) stability of planetary waves, iii) the relationship between mean currents and planetary waves, iv) the influence of topography on the mean current, v) a simple relationship between wave dissipation and viscous boundary layers and vi) some ageostrophic effects on large-scale phenomena. Studies now in progress and related suggestions are also described and discussed in the article
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02309060
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  • 10
    Electronic Resource
    Electronic Resource
    Long nonlinear topographic planetary waves in a rotating stratified ocean (1983)
    Springer
    Journal of oceanography 38 (1983), S. 339-345 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Long nonlinear topographic waves in a continuously stratified ocean with a linear bottom slope are investigated. It is shown that odd cross-channel modes are governed by the Korteweg-de Vries (K-dV) equation. The solitary waves are those of a low pressure type. The long waves are shown to be modulationally stable because of the nonlinear effect due to irrotational motion. All these results are missed if the conventional quasi-geostrophic approximation is adopted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02111030
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